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 E08: Minisymposium: Equation of State Information from Astrophysics and Nuclear Physics Experiments
7:00 PM–9:30 PM,
Wednesday, November 29, 2023
Hilton Waikoloa Village
Room: Kohala 1
Chair: Mizuki Kurata-NIshimura
Abstract: E08.00009 : Contraining the momentum dependence of the symmetry energy with heavy-ion collisons
9:15 PM–9:30 PM
Presenter:
Kyle W Brown
(Michigan State University)
Authors:
Kyle W Brown
(Michigan State University)
Betty Tsang
(Michigan State University)
William G Lynch
(Michigan State University)
Chi-En Teh
(Facility for Rare Isotope Beams, MSU)
Zbigniew Chajecki
(Western Michigan University)
Jeonghyeok Park
(Center for Extreme Nuclear Matters, Korea University)
Recent experiments at the National Superconducting Cyclotron Laboratory were performed to help constrain these momentum-dependent interactions along with the density dependence. By measuring the kinetic energy spectra of neutrons and protons, or analogously using “pseudo neutrons” from measured tritons and helium-3, the sign and magnitude of this effective-mass splitting can be extracted, with the help of transport models. Collisions of beams of 40,48Ca at 50 and 140 MeV/A impinged on targets of 58,64Ni and 112,124Sn, and the light, charged particles and neutrons emitted in these collisions were detected. Charged particles up to boron were detected, with isotopic resolution, in the upgraded High-Resolution Array and neutrons were detected in the Large-Area Neuron Array. I will discuss some of the important physics motivations for studying the nuclear Equation of State, present details about the experiment setup, and then discuss some results on the spectral ratios with comparisons to transport model calculations. I will show results of a Bayesian analysis used to constrain the momentum and density dependence of the symmetry energy simultaneously.
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