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 4WHB: Frontiers of Spin-Isospin Excitations IIInvited Workshop
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Chair: Masaki Sasano, RIKEN Nishina Center Room: Hilton Waikoloa Village Kohala 1 |
Monday, November 27, 2023 4:00PM - 4:30PM |
4WHB.00001: Beta-decay measurements with total absorption spectroscopy for nuclei far from stability Invited Speaker: Stephanie M Lyons Understanding the origin of the elements is a driving mission for the low-energy nuclear community. As roughly half of the elements in universe are thought to be generated through the rapid-neutron capture process, a large focus has been given to understanding this process. Sensitivity studies show that the final abundance distributions of r-process nuclei are greatly impacted by β-decay properties, such as half-lives and β-delayed neutron-emission probabilities. Several experimental campaigns using the Summing NaI (SuN) detector for total absorption spectroscopy (TAS) will be presented. These studies demonstrate the capabilities of the TAS technique to determine or select for spin in order to better understand exotic nuclei. Increasing our understanding of how nuclei evolve across the nuclear chart can inform theoretical calculations for a variety of applications, including nucleosynthesis models. |
Monday, November 27, 2023 4:30PM - 5:00PM |
4WHB.00002: Double Gamow-Teller transitions and the matrix elements of neutrinoless double-beta decay Invited Speaker: Javier Menendez Neutrinoless double-beta decay (0nbb) is a decay of an atomic nucleus where only two electrons are emitted. Since two matter particles (leptons) are emitted without the balance of antimatter, this is a unique process to explore physics beyond the Standard Model of particle physics, establish the Majorana the nature of neutrinos, and gain insights on the dominance of matter in the Universe. Being the decay of an atomic nucleus, its lifetime depends on the square of a nuclear matrix element (NME) that needs to be calculated with nuclear many-body methods. However, different state-of-the art calculations typically disagree in the NME predictions, leading to an uncertainty of the physics reach of current 0nbb searches, and potentially limiting the extraction of the relevant physics once the decay is detected experimentally. In this contribution I will discuss the potential of double Gamow-Teller transitions, a process mediated by the strong interaction, to provide insights on the 0nbb NMEs. In particular, I will discuss theoretical studies performed with different many-body methods (the nuclear shell model, the quasiparticle random-phase approximation and the valence-space in-medium similarity renormalization group) relating theoretical double Gamow-Teller transitions and 0nbb NMEs of the same nucleus. Finally, I will discuss the origin of the correlation between the two processes. |
Monday, November 27, 2023 5:00PM - 5:30PM |
4WHB.00003: Search for double Gamow–Teller giant resonance using the double charge exchange (12C, 12Be(0+2) ) reaction Invited Speaker: Akane Sakaue Double Gamow–Teller giant resonance (DGTGR) is the simplest two-phonon modes occurring in the spin-isospin channel, which is accompanied by the flip of both of the spin and isospin twice, without change of the orbital angular momentum. This mode was first proposed by Auerbach in 1989[1] but not yet observed despite of many experimental challenges[2, 3, 4]. The search for the DGTGR attracts particular attention because of links to the neutrino physics; the transition strength and the centroid energy of the DGTGR are suggested to be strongly correlated with the nuclear matrix element for a neutrino-less double beta decay[5]. |
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