Author: Richard Jones

A Team Effort is Giving New Life to a Classic Observatory

Elaina Hancock – UConn Communications

After nearly 20 years of being out of commission, UConn’s East Road Observatory is back up and running
After nearly 20 years of being out of commission, UConn’s East Road Observatory is back up and running. The observatory will be renamed in a ceremony on October 21st where the team that restored the facility will demonstrate its capabilities. (Contributed photo)

Professor Cynthia Peterson was the first woman on the UConn physics faculty, and over the course of her 49 years at the University, she was known for her enthusiasm and passion for teaching and outreach and was always generous with sharing her knowledge. She was also known for her pursuit of the installation of an observatory j

Less than two weeks after touring the inside of the observatory in January of 2023, the team, including Allen Hall pictured here, began taking apart the old telescope and started working on restoring the facility.
Less than two weeks after touring the inside of the observatory in January of 2023, the team, including Allen Hall (pictured), began taking apart the old telescope and started working on restoring the facility.

ust off campus in Storrs, and in 1970 she and machinist Richard Mindek built the East Road Observatory.

Sadly, after a few decades of use, the observatory eventually fell out of repair and was largely forgotten until recently. A team, including employees, students, researchers, an alum, and an award-winning telescope builder, have breathed new life into this important piece of research equipment and UConn history.

In the fall of 2022, Physics Assistant Professor-in-Residence Matthew Guthrie learned about the observatory and started to wonder about its history.

“When I learned that it was no longer in use, I asked around to see why and how we could get it up and running again. Getting it fixed up was not in my skillset, so I didn’t think too much more about it,” says Guthrie. “Then Allen Hall, a local award-winning telescope designer, emailed our department chair out of the blue in January. He wanted to donate a telescope that he built. We connected and I told him about the derelict observatory, about a week later we were taking it apart.”

Guthrie reflects that the facility was in rough shape, and Hall later admitted he thought it was a lost cause, but they stuck with it. Now, after months of repairs, troubleshooting, and cleaning out critters and junk, the observatory is back in action and will be formally renamed at a ceremony scheduled for Tuesday, October 24th where Guthrie says they plan to demonstrate its upgraded capabilities.

Guthrie says jumping straight into the restoration has been an amazing and collaborative learning experience.

“I’m learning as much as I can from him (Hall), and his mechanical and technical skills are exactly what we needed to get this place restored to its former glory, and given the work and upgrades we’ve already made, they’re even better than the original design.”

All the while, Guthrie has tried to find out as much as he can about the observatory’s history. For instance, there is also an additional cement pad and utility hookups that were not previously used, and there are hopes that the facility can be expanded in the future to include a classroom, says Guthrie.

An alum who worked in the dome as a student and has also helped with the restoration effort, Dennis Perlot ’82 (ENG), saw the logbook and remembered the last, ominous entry dating from 2009 which read: “Dome stuck, mount frozen.” Perlot says the now-lost logbook also contained entries about asteroids, comets, and other discoveries.

Here Guthrie is working on reassembling the telescope. He says, “My graduate and postdoc work was mostly theory-based, so being back in a place where I can literally get my hands dirty again makes me happy, and seeing the results of our labor has been rewarding.”
Here Guthrie is working on reassembling the telescope. He says, “My graduate and postdoc work was mostly theory-based, so being back in a place where I can literally get my hands dirty again makes me happy, and seeing the results of our labor has been rewarding.” (Contributed photo)

Other challenges have grown up around the observatory, says Guthrie, because when it was built, the site was likely in the middle of an empty field. Decades later, the field now hosts a patch of trees and agricultural research fields.

Guthrie says the agricultural research farm staff, including Farm Manager Travis Clark, has been very supportive in helping to remove some of the trees when they can. Though people working on the farm have wondered what the strange building was for a while, now it presents an opportunity for new collaborations. Guthrie says one plan is to plant a “moon garden” around the building with night-blooming flowers.

“Getting the facility back up and running has been an amazing and rewarding experience. This will be a force for good in the department and at the university,” says Guthrie. “Our department has big-shot astrophysicists who work on JWST and Hubble. They like their telescopes to be in space, but having a telescope here is a powerful thing.”

UConn researchers have access to a network of telescopes around the world but time on the scopes requires fees after submitting proposals justifying the need for research time on the scopes. Now, Guthrie says students and researchers can get some hands-on experience with an earth-bound scope right here in Storrs.

“There’s nothing more fun than going through the theory in class and then seeing what it looks like with your own eyes and making that connection. That’s one of my basic philosophies of being a teacher, you can do all the theory that you want, and you probably can be pretty good at it. But if you can’t apply it, and see what that theory does in real applications, there’s no point. Things like this observatory are great tools for that building perspective.”

The team repaired, cleaned, and upgraded the observatory and it is better than before.
The team repaired, cleaned, and upgraded the observatory and it is better than before.

Upgrades to the facility include GPS for tracking the stars, enabling different kinds of research the observatory was not capable of previously, and Guthrie hopes to set up the system so it can be controlled remotely.

“With tracking, the scope rotates just a little bit at a constant rate to track along with the motion of the stars and that lets us do real science because you must look at something for a long time to really study it. One of the things that we’re excited to do is exoplanet studies where you need to take a few hours of exposure to accurately measure how much light you’re getting from the star so that any variability in that light you can attribute to a planet passing between us and the star. Doing that requires accurate tracking.”

At sunset on October 24th, following the short opening and renaming ceremony, Guthrie says they will fire up the new 16-inch telescope for an exploration of deep sky objects, planets, and (if visibility allows), the Apollo 15 landing site.

Physics Celebrates 51’st Annual Ascent of Mount Monadnock

On October 14, 2023 40-50 members and friends of the UConn Physics department took part in the 51’st annual ascent up Mount Monadnock, near Jaffrey, New Hampshire. After the hike, the then-hungry hikers descended to the campground near Gilson Pond and enjoyed some well-earned refreshments, including burgers, hot dogs, and more sausages than anyone could eat. News of the group’s cheer “Let’s Go, Physics” from the summit is expected soon to be trending on youtube. Rumors are circulating that it may have been heard as far as Boston and Storrs.

UConn Physics annual climb of Mount Monadnock, taken October 14, 2023
UConn Physics Department members rest after ascent of Mount Monadnock near Jaffrey, NH 14-Oct-2023

Remembering Jeff Schweitzer, colleague and mentor

Jeff Schweitzer (second from right) shown together with PhD student Fridah Mokaya (second from left) following her PhD defense in May, 2018. Also shown standing beside Fridah are husband Jonathan and daughter Jenise, with faculty advisors Richard Jones (left) and Peter Schweitzer (right).

Jeff Schweitzer passed away unexpectedly last year on May 31, 2022 in his home in Ridgefield, CT. Jeff was a faculty member in the physics department for 25 years (1997-2022). Jeff earned his B.S. in Physics from the Carnegie Institute of Technology (1967), and his M.S. (1969) and Ph.D. (1972) in physics from the Purdue University conducting research in low-energy nuclear physics. After his postdoctoral research at the California Institute of Technology (1972–1974) he worked as scientific advisor at Schlumberger-Doll Research (1974–1996) where he employed his expertise in nuclear experimental techniques to applications in geology and developed several patents. Jeff served for 35 years on the editorial boards of the Journal of Nuclear Geophysics (1987-1993) and Applied Isotopes and Radiation (1993-2022). A skilled nuclear experimental physicist, Jeff applied his expertise to a wide variety of fields: from fundamental experimental nuclear physics, to astrophysics, to studies of the nanoscale kinetics in cement chemistry, to instrumentation development with applications in medical physics, forensic science, and planetary mission satellites and landers.

Jeff taught at the Waterbury campus for several years, and was a devoted mentor for his students. At UConn, he was the PhD advisor for Nada Jevtic (Phd 2003) who is now faculty at the Bloomsburg University, Tim Spillane (PhD 2008) who works now as data scientist at Hiya Inc, and James Zickefoose (PhD 2011) who is now Senior Research Scientist at Mirion Technologies, Inc. in Meriden, CT. Jeff was the mentor and co-advisor for many more PhD students including Fridah Mokaya who was Jeff’s most recent advisee. Jeff also mentored junior UConn faculty including Howard Winston and Peter Schweitzer (not related to Jeff despite the same last name).

Howard Winston recalls that Jeff went out of his way to help him during his early days at UConn. He was extraordinarily generous with his time explaining his teaching philosophy and sharing course materials. While doing so, Jeff was never overly didactic. He enjoyed talking about areas where his approaches could be customized or improved. Jeff loved to keep in touch to see how things were going. In common with others, Howard misses his warm smile and sage advice.

Fridah Mokaya recalls: “I will forever treasure this memory as it is a constant reminder of Jeff’s dedication as an advisor and mentor. Jeff greatly influenced the career path I took, I remember when I was not certain of what to do or which path to take post graduation, his words of wisdom and guidance enabled me Identify my strength and passion. He was not only an advisor and mentor but also a great friend, who would constantly call, text, email and visit to check on how everything was progressing. I will greatly miss his advice and words of wisdom.” The picture taken after Fridah’s PhD defense shows Jeff Schweitzer (second from the right) together with Fridah, her husband and daughter (middle), Richard Jones (left, main advisor) and Peter Schweitzer (right, associate advisor).

More information about Jeff can be found in the news article of the Institute of Materials Science, in Jeff’s obituary and in the article in the journal Applied Radiation and Isotopes. Many of Jeff’s articles and scientific contributions can be found on the Research Gate website.

Physics Prof. Tom Blum recognized for Research Excellence

Prof. Thomas Blum is one of two faculty to receive the Research Excellence award from the University of Connecticut in 2022.  Tom came to UConn in 2004 and is a professor and associate department head for undergraduate education in the Physics Department. As a theoretical physicist, Blum specializes in making difficult, detailed mathematical calculations concerning how basic theories of physics, such as quantum mechanics, play out in setting the properties and behavior of matter, in his case the tiniest particles known. Notably, Blum is able to figure out how to perform calculations that others have found not possible. He has held visiting professorships at KEK in Japan, CERN in Switzerland, and the Helmholtz Institute in Germany. He has also won research awards including an Outstanding Junior Investigator award from the US Department of Energy, the Ken Wilson Award (top award in his subfield), is a Fellow of the American Physical Society, and was named a Fermilab Distinguished Scholar. At the same time, he is also a dedicated mentor, who supports the development of junior colleagues, and undergraduate and graduate students.

 

Standard model challenged by new measurement

The following article appeared in UConn Today on May 20, 2021 under by-line  

Physicists are one step closer to describing an anomaly, called the Muon g-2, that could challenge the fundamental laws of physics. It seems the muon may be breaking what have been understood as the laws of physics, and the findings announced on April 7th were met with much excitement and speculation at what this might mean. UConn physics researchers Professor Thomas Blum and Assistant Professor Luchang Jin helped pioneer the theoretical physics behind the findings, and they recently met with UConn Today to help explain the excitement.

What is a muon, and how do you study them?

Blum: A muon is a “fundamental particle,” meaning it’s an elementary particle like an electron or a photon. Muons are unstable, so they don’t live very long. Unlike an electron, where we can focus on them as long as we want and do measurements, we only have a little bit of time to take measurements of muons.

The way researchers perform the experiment is by slamming particles into other particles to create the muons, and they eventually collect them into a beam. This beam of muons travels at almost the speed of light where they live a little bit longer than they would if they were at rest. That’s Einstein’s theory of relativity in action.

The researchers put the muons into what’s called a storage ring where, eventually, they decay into other particles, and it’s those other particles that are detected in the experiment.

Muons have a property called a magnetic moment, which is like a little compass that points in the direction of the magnetic field that it’s in. In the storage ring, there’s a uniform magnetic field, and as the muons are going around in the storage ring, their magnetic moment, which would be perfectly aligned with their direction of travel if there were no anomaly, actually precesses with respect to the direction of travel as it goes around the ring, because of the interaction with the magnetic field.

It’s that precession that they’re measuring, because the precession is proportional to the strength of the magnetic moment. We can measure this magnetic moment extremely precisely in experiments, and we can calculate its value theoretically very precisely, to less than one-half part per million. Then we can compare the two and see how well they agree.

Can you explain the excitement surrounding these results?

Blum: For a long time — almost 20 years — the best measurement had been done at Brookhaven National Lab on Long Island, where they measured this magnetic moment very precisely, and found that it didn’t agree with our best fundamental theory, which is called the Standard Model of particle physics. The discrepancy wasn’t big enough to say that there was definitely something wrong with the Standard Model or not.

The new results are from a new experiment done to measure the magnetic moment even more precisely. That effort has been going on at Fermilab outside of Chicago for a few years now, and they just announced these results in early April. Their measurement is completely compatible with the Brookhaven value, and if you take the two together, then the disagreement with the Standard Model gets even worse: it now stands at 4.2 standard deviations.

People are very excited, because this could possibly signal that there is new physics in the universe that that we don’t know about yet. The new physics could be new particles that we’ve never seen before, or new interactions beyond the ones we know about already and that could explain the difference between what’s measured and what’s calculated. So that’s what everybody’s excited about.

Can you tell us about the Standard Model?

Jin: The Standard Model describes electromagnetic interactions between charged particles. It also describes the so called weak interactions, which is responsible for nuclear decay. The weak interactions become more important in high energy collisions, and unifies with the electromagnetic interactions. Lastly, the Standard Model describes the strong interactions, which bind quarks into nucleons and nuclei.

Basically, the Standard Model describes everything around us, ranging from things happening in our daily lives to the high-energy proton collisions in the Large Hadron Collider, with the major exception being gravity, which is only sort of visible, but we can feel it because gravity forces always add up, and there are a lot of other massive objects around us. It also doesn’t include dark matter, if we actually do have that in the universe.

People believe, and I think this is really true, that the Standard Model cannot possibly describe everything to extremely high precision, especially when we accelerate subatomic particles to very high energies. However, it was not very clear how high the energy or the precision has to be before we can see some discrepancies. We know the upper bound — usually referred to as the Planck scale, where the Standard Model has to fail due to the omission of gravity. But the Planck scale is so high that there is little hope to be able to perform experiments at that high energy. It is very nice to find a concrete example that the Standard Model actually misses something, and the g-2 anomaly is a very good candidate.

What roles did you each have in this research?

Jin: Theoretically, we decomposed the g-2 into contributions from the different types of interactions. At present, most of the values are obtained by analytic calculations of the various contributions. Other experimentally measurable quantities that have little to do with the muon magnetic moment experiments in terms of what they measure can be related through the Standard Model to the Muon g-2 value. So, to a large extent, this can still be viewed as a theory prediction. Blum pioneered the first lattice calculation for a certain g-2 contribution called the hadronic vacuum polarization, which doesn’t use experimental data at all.

Blum: Jin came up with new methods to compute the Hadronic Light-by-Light contribution which allowed us – with colleagues at Brookhaven National Lab, Columbia University, and Nagoya University – to compute it completely for the first time without experimental input. What Jin and I are doing, along with a host of other theorists around the world, is trying to better calculate the value of this magnetic moment from the theory side, so that we can have an even better comparison with the experimental measurements.

Jin: The Standard Model itself has a few parameters, which for most, we know very, very precisely. This includes the masses of the fundamental particles. In principle, as one might imagine, the theory prediction of the Muon g-2 is a very complicated expression just in terms of these numbers. We are not able to do that yet, but maybe soon we can. We expect that if we continue to improve our calculations, and as computers continue to get faster, the last digit determination may become more accurate.

To dig deeper into the science behind the findings, read Blum and Jin’s feature article on the findings in CERN Courier.

Professor Munirul Islam: Celebrating His Life and His Legacy

Dear Colleagues:

I would like to share some thoughts on Munir Islam who recently passed away. Prof. Islam came to UConn in 1967 from a faculty position at Brown University. In the late 1970s there were two particle theorists at UConn, Profs. Kurt Haller and Munir Islam. They set about building an elementary-particle theory program here and garnered the support of then Physics Head Joe Budnick and CLAS Dean Julius Elias. They soon obtained funding for a new Department of Energy initiative to support particle theory in the Department. In 1979 they
were able to bring me in as an Associate Professor and Mark Swanson as an Assistant Professor. So eager were Kurt and Munir to bring us in, they chose to forego the summer salary that they had been awarded on the DOE grant.  The impact of the DOE grant on the UConn administration was quite far reaching and led to further internal support. Within a few years I had been tenured and promoted to Full and Mark had been tenured and appointed to Associate at our Stamford branch, where he later became an administrator.

After that, Kurt and Munir were able to secure a bridge position with the DOE that would provide five years of support, provided the UConn administration would create a tenure track position for the recipient. This they agreed to do, and so we brought in Daniel Caldi at the Assistant level, who subsequently was appointed Associate with tenure. Dan eventually opted to leave us for SUNY Buffalo, but our particle group was then able to convince the UConn administration to let us keep the position, and we then hired Gerald Dunne. Gerald went up the ladder very quickly to tenured Full professor. The success of our program enabled us subsequently to bring in Alex
Kovner, followed by Tom Blum (both now tenured Full) and current Assistant Luchang Jin. The success and endurance of the particle group for more than forty years now is a testament to the foresight and the unwavering and unabating commitment of Kurt and Munir to it, and it serves as permanent memorial to both of them.

Munir Islam always retained an enthusiasm for research, an enthusiasm which did not diminish at all after he retired. He focused on fundamental problems in particle physics, with particular emphasis on the theory of the structure of the proton as revealed by high-energy proton-proton scattering. This is perhaps best evidenced in what essentially became a lifelong collaboration with his former graduate student Richard Luddy (at the right, with Prof Islam at the left in the above photograph) as the two of them grappled with Munir’s deep ideas on proton scattering during many of Munir’s later years as a Professor and then as an Emeritus. Munir had a gift for simple pictorial explanations of his research, which he was able to explain lucidly in a lecture for visiting high-school teachers and students during an open house. Munir was urbane, worldly, and wise, and it was a great joy to have him not just as a colleague but also as a friend. He will be sorely missed by all of those that knew him and especially by me as my career owes so much to him. In appreciation, Philip Mannheim.In appreciation,

Philip Mannheim.

A Signal from Beyond

Looking for ripples in the fabric of spacetime.

UConn astrophysicist Chiara Mingarelli is part of a team of researchers who recently published data on a hint of a signal that sent ripples of excitement through the physics community. These monumental findings are the culmination of twelve and a half years of data gathered from NANOGrav — a network of pulsars across the galaxy — all in the hopes of detecting gravitational waves.

Gravitational waves are generated when galaxies merge and supermassive black holes at their centers collide and send low-frequency gravitational waves out into the universe. The team thinks the source of the signal could be gravitational waves, but it will take about 2 more years of data to be sure.

The findings sparked the interest of other physicists with their own speculations about the signal, such as cosmic strings or primordial black holes. Though still a couple of years away, Mingarelli says the final results could also help test General Relativity or even open the door to entirely new physics.

This article first appeared on UConn Today, February 15, 2021

Jonathan Trump wins NSF Early Career Award

Jonathan Trump, Assistant Professor of Physics, will receive $738,090 over five years to compile a census of supermassive black holes in the universe. This will give insights into how supermassive black holes and galaxies evolve across cosmic time. Trump will also develop a bridge program for underrepresented undergraduate physics majors at UConn to increase their participation in STEM fields.
The NSF Faculty Early Career Development (CAREER) Program supports early-career faculty who have the potential to serve as academic role models in research and education, and to lead advances in the mission of their department or organization. Activities pursued by early-career faculty build a firm foundation for a lifetime of leadership in integrating education and research.
Trump was one of 7 junior faculty at the University of Connecticut to receive the prestigious Early Career awards from NSF in 2020. For a description of all 7 awards, see this recent article published in UConn Today.

Radiation Damage Spreads

Radiation Damage Spreads Among Close Neighbors

X-ray absorption cascade
Direct hit. A soft x-ray (white) hits a holmium atom (green). A photo-electron zooms off the holmium atom, which releases energy (purple) that jumps to the 80-carbon fullerene cage surrounding the holmium. The cage then also loses an electron. (Courtesy of Razib Obaid)

 – Kim Krieger – UConn Communications

A single x-ray can unravel an enormous molecule, physicists report in the March 17 issue of Physical Review Letters. Their findings could lead to safer medical imaging and a more nuanced understanding of the electronics of heavy metals.

Medical imaging techniques such as MRIs use heavy metals from the bottom of the periodic table as “dyes” to make certain tissues easier to see. But these metals, called lanthanides, are toxic. To protect the person getting the MRI, some chemists wrap the lanthanide inside a cage of carbon atoms.

Molecular physicist Razib Obaid and his mentor, Prof. Nora Berrah in the physics department, wanted to know more about how the lanthanides interact with the carbon cages they’re wrapped in. The cages, 80 carbon atoms strong, are called fullerenes and are shaped like soccer balls. They don’t actually bond to the lanthanide; the metal floats inside the cage. There are many similar situations in nature. Proteins, for example, often have a metal hanging out close to a giant organic (that is, mostly made of carbon) molecule.

So Obaid and his team of collaborators from Kansas State University, Pulse Institute at Stanford, Max Planck Institute at Heidelberg, and the University of Heidelberg studied how three atoms of the lanthanide element holmium inside of an 80-carbon fullerene reacted to x-rays. Their initial guess was that when an x-ray first hit one of the holmium atoms, it would get absorbed by an electron. But that electron would be so energized by the absorbed x-ray that  it would fly right out of the atom, leaving a vacant spot. That spot would than get taken by another of the holmium’s electrons, which would have to jump down from the outer edge of the atom to fill it. That electron had formerly been partnered with another electron on the outskirts of the atom. When it jumped down, its lonely ex, called an Auger electron, would zoom away from the whole molecule and get detected by the scientists.  Its distinctive energy would give it away. 

It sounds complicated, but that would have been the simplest (and thus most likely) scenario, the physicists thought. But it’s not what they saw.

When Obaid and his colleagues zapped the holmium-fullerene molecule with a soft x-ray (about 160 electron-volts), the number of the Auger electrons detected was too low. And too many of the electrons had energies much less than the Auger electrons should have. 

After some calculating, the team figured out there was more going on than they’d guessed.

First, the x-ray would hit the holmium, which would lose an electron. The vacant spot would then be filled by the outer edge electron from the holmium atom. That much was correct. But the energy released by the jumping electron (when it jumps ‘down’ from the outskirts of the atom to the interior, it also jumps ‘down’ in energy) would then be absorbed by the carbon fullerene cage or another of the neighboring holmium atoms. In either case, the energy would cause an additional electron to zoom away from whatever absorbed it, the fullerene cage or the holmium atom.

Losing these multiple electrons destabilized the whole molecule, which would then fall apart entirely.

The end result?

“You can induce radiation damage just by striking one atom out of 84,” says Obaid. That is, a single x-ray strike is  enough to destroy the entire molecule complex through this energy transfer process involving neighboring atoms. It gives some insight into how radiation damage occurs in living systems, Obaid says. It was always thought that radiation damaged tissue by stripping away electrons directly. This experiment shows that interactions between an ionized atom or molecule and its neighbors can cause even more damage and decay than the original irradiation.

The work also gives medical physicists an idea of how to limit patient’s exposure to heavy metals used as dyes in medical imaging. Shielding all parts of the body from the radiation except for those to be imaged with heavy metal dyes can potentially restrict the heavy metal exposure as well as the radiation damage, the researchers say. The next step of this work would be to understand exactly how fast this interaction with the neighbors occurs. The researchers expect it to take place in just a few femtoseconds (10-15 s). 

The work was funded by Department of Energy, Basic Energy Sciences (BES), Division of Chemical Sciences, Geosciences, and Biosciences, under Grant No. DE-SC0012376.

UConn seismometer detects Puerto Rico event

 

The Geophysics research group (Prof. Vernon Cormier and students) operate a seismic wave station that continuously monitors vibrations in the earth’s crust, many of which arise from seismic events that happen far away. These waves travel through the deep earth, and eventually make their way to the surface where they are detected. The above figures show high frequency and low frequency filtered seismograms recorded at UConn’s seismic station for the vertical component of ground motion from the earthquakes in Puerto Rico on January 7, 2020.  The 3 bursts of energy are P and S elastic waves, followed by a T wave, which propagates as an acoustic wave in the ocean.  In the high frequency seismogram (first figure), the large red trace is the main shock and the black trace below it is an aftershock. In the low frequency filtered seismogram (second figure), the largest energy propagates as a surface wave trapped in Earth’s crust and upper most mantle, with energy exponentially decaying into the mantle. Amplitude scale for ground particle velocity is shown by a bar in the upper left corner.