Month: November 2021

Posted on

Chan Kim defends his PhD Thesis!

Prof. Strakovsky introduces Chan to the assembled committee over Zoom.

On Nov. 23rd, Chan Kim successfully defended his PhD thesis, titled “Measurement of the Helicity Asymmetry E for the γp → π0p reaction in the Resonance Region.” Chan analyzed data from the “FROST” experiment at Jefferson Lab, which used a polarized proton target in the form of frozen butanol beads. A polarized photon beam was scattered from the target, and Chan was interested in collisions that produced a single pi0 meson. In his analysis, Chan determined the slight difference in scattering rates when the photons and protons had their spins aligned versus anti-aligned. This can help reveal excited baryon resonances and in turn help us better understand the different ways quarks can bind together.

Dr. Kim explains the Frozen Spin Target (FROST) used in the experiment.
Posted on

Two new experiments on short-range correlations are underway at Jefferson Lab!

Data is coming in on two of our group’s new experiments at Jefferson Lab investigating how protons and neutrons form short-range correlations within nuclei. In experimental hall B, we are colliding electrons accelerated to an energy of 6 Giga-electron Volts (GeV) on, hydrogen, deuterium, helium, carbon, argon, calcium, and tin nuclei, with the goal of knocking out protons and neutrons and detecting the emerging particles in the CLAS12 spectrometer. At the same time in experimental hall D, we are colliding photons with energies in the range of 8 to 8.5 GeV on deuterium, helium, and carbon, hoping to cause reactions that produce short-lived mesons that we can identify with the GlueX spectrometer. We are still in the early stages of calibrating the instruments, and teams are working around the clock to make sure the data is looking good, but we are already starting to see the reactions we expect!

Hall B
In our first day’s data, scattering on hydrogen, we can clearly see elastic scattering, resonance production, and deep inelastic scattering
The Hall B analysis team, including Erin, Sara, and Tyler goes over the previous day’s data in the daily analysis meeting.
Hall D
The Hall D team, including Phoebe, coordinates on detector calibrations.

The first trickle of data already show signatures of rho meson and Delta baryon photo-production.
Viewing Message: 1 of 1.
 Notice

This site uses cookies to offer you a better browsing experience. Visit GW’s Website Privacy Notice to learn more about how GW uses cookies.