Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session 4WKA: Recent Progress in Nuclear Physics with Hyperons IInvited Workshop
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Chair: Patrick Achenbach, Jefferson Lab/Jefferson Science Associates Room: Hilton Waikoloa Village Kohala 3 |
Monday, November 27, 2023 2:00PM - 2:30PM |
4WKA.00001: Measurements of hypernuclei production and properties in heavy ion collisions at STAR Invited Speaker: Yuanjing Ji Hypernuclei, bound states of nuclei with one or more hyperons, serve as a natural laboratory to investigate the hyperon-nucleon (Y-N) interaction, an important ingredient for the equation-of-state (EoS) of nuclear matter. Precise measurements of hypernuclei properties and their production yields in heavy-ion collisions are crucial for the understanding of the strength of the Y-N interaction and their production mechanisms. The strangeness population factor, SA=(AΛH/AH)/(Λ/p) (A=3,4), is of particular interest as it directly relates to the ratio of light nuclei and hypernuclei coalescence parameters. Moreover, it is suggested that SA might be sensitive to the onset of deconfinement. The STAR Beam Energy Scan II program and isobar collisions offer a great opportunity to investigate energy and system size dependence of hypernuclei production. |
Monday, November 27, 2023 2:30PM - 3:00PM |
4WKA.00002: Decay pion spectroscopy of electro-produced light Lambda hypernuclei at MAMI Invited Speaker: Ryoko Kino The hypertriton 3ΛH, the lightest hypernucleus, consists of a proton, a neutron, and a Lambda. This simplest Lambda hypernucleus has been used as an essential benchmark of hypernuclear physics, including understanding Λ-N interaction. Its Lambda-binding energy (BΛ) is approximately 130 ± 50 keV based on emulsion data summarized by Jurič et al. The shallow binding energy suggests a 3ΛH lifetime similar to that of a Lambda particle in free space(τΛ = 263 ps). However, recent heavy ion collision experiments have observed lifetimes and binding energies of hypernuclei, sparking significant interest. |
Monday, November 27, 2023 3:00PM - 3:30PM |
4WKA.00003: Theoretical investigations of the nnΛ/NNΣ system Invited Speaker: Benjamin F Gibson No published nΛ scattering data exist, so that the JLab tritium K+ electroproduction of nnΛ was undertaken in an effort to observe a nnΛ resonance that would provide constraints on the nΛ interaction. We will discuss Faddeev-type calculations of such a resonance based upon pairwise potentials of rank-one separable form that fit effective range parameters of the nn data and effective range parameters for four NΛ potentials from the Nijmegen and Juelich groups that fit pΛ scattering data. Utilizing rank-one separable potentials allows one to analytically continue the nnΛ Faddeev equations into the second complex energy plane in search of resonance poles by examining the eigenvalue spectrum of the kernel of the equations. Modeling the position and width of the K+ spectrum was found to provide significant constraints on the heretofore unmeasured nΛ interaction. |
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