Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session D12: Mini-Symposium: Strangeness and HypernucleiMini-Symposium Recordings Available
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Sponsoring Units: DNP Chair: Liguang Tang, Hampton University Room: Majestic |
Saturday, April 9, 2022 1:30PM - 2:06PM |
D12.00001: Hyperons and Hypernuclear Physics Invited Speaker: Toshiyuki Gogami TBD |
Saturday, April 9, 2022 2:06PM - 2:18PM |
D12.00002: Jefferson Lab experiment E12-15-008: high precision spectroscopy of 40K and 48K single-Lambda hypernuclei Joerg Reinhold Nuclear matter containing strangeness is thought to play an important role in stellar objects like neutron stars. Models predicting the appearance of Lambda hyperons with increasing density set an upper limit on the mass of neutron stars. This is challenged by recent observations of neutron stars with masses around two solar masses. A repulsive three body Lambda NN force could delay the onset of hyperonization and, thus, support more massive systems. The Jefferson Lab experiment E12-15-008 will address this question by studying the isospin dependence of the Lambda-Nucleon interaction through the high precision spectroscopy of 40K and 48K single-Lambda hypernuclei. I will briefly explain the theoretical motivation and then present the planned experimental program. |
Saturday, April 9, 2022 2:18PM - 2:30PM |
D12.00003: Analysis Update on the E12-17-003 Experiment Bishnu D Pandey
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Saturday, April 9, 2022 2:30PM - 2:42PM |
D12.00004: Studying Λ Interactions in Nuclear Matter with the 208Pb(e,e'K+)208ΛTl Reaction Pete C Markowitz The Jefferson Lab Hypernuclear Collaboration is carrying out a set of measurements to look at properties of hypernuclear matter. One particular interest by the collaboration is the issue the production and energy levels of strange baryons in large nuclear systems. As part of those studies, Jefferson Lab approved experiment E12-20-013 will use a lead target to study the limits of Λ baryons in nuclear matter. This talk will present the physics and scientific impact of the experiment. |
Saturday, April 9, 2022 2:42PM - 2:54PM |
D12.00005: Photoproduction of Λ* Resonances Using the CLAS Detector Utsav Shrestha, Kyungseon Joo We present the study of the reaction γ p →K+ Λ* using the photoproduction data from the CLAS-g12 experiment performed in Hall B of Jefferson Laboratory. Much is known about the photoproduction of the hyperon resonances Λ(1405)1/2- and Λ(1520)3/2-, but little is known about photoproduction to the higher-mass resonances Λ(1670)1/2- and Λ(1690)3/2-. In the quark model, the Λ(1405) and Λ(1520) resonances are assigned to the SU(3) singlet, where the Λ(1670) and Λ(1690) are assigned to the octet. The decay of Λ* resonances, Λ(1520), Λ(1670), and Λ(1690), into two exclusive channels, Σ+π- and Σ-π+, is studied from the detected K+, π+, π- particles. The Λ(1520) differential cross sections are in good agreement with the previous CLAS measurements and are extended to higher photon energies. Newly added are the differential cross sections as a function of invariant 4-momentum transfer t, which is the natural variable to use for a theoretical model based on a Regge-exchange reaction mechanism. No new N* resonances decaying into the K+ Λ(1520) final state are found. The cross-sections for the higher mass resonances, Λ(1670) and Λ(1690), are studied for the first time using photoproduction. |
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