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 4WRA: Super Heavy Nuclei and New Elements IInvited Workshop
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Chair: Hideyuki Sakai Room: Hilton Waikoloa Village Kona 4 |
Monday, November 27, 2023 2:00PM - 2:30PM |
4WRA.00001: The quest for superheavy nuclei: covariant density functional theoretical perspective Invited Speaker: Anatoli Afanasjev In covariant density functional theory (CDFT), the nucleus is described as a system of nucleons which interact by the exchange of different mesons. I will review recent progress in the study of superheavy and beyond elements within the CDFT framework. The understanding of such nuclei and physics behind it is important not only for nuclear structure and nuclear reactions but also for nuclear astrophysics. This is because the ground state and fission properties of such nuclei on neutron-rich side of nuclear landscape are important for the termination of the r-process. I will focus on three topics. First, the general situation with the description and predictions of the properties of superheavy nuclei in the CDFT framework will be reviewed. Second, the analysis of the impact of dynamical correlations on ground state and fission properties of such nuclei will be presented. Third, the ongoing efforts on global improvement of the performance of covariant energy density functionals and the description of superheavy nuclei will be discussed. In addition, the improvements in the pairing channel of the CDFT which strongly affects the fission properties will be considered. The existing challenges and potential ways of their resolution will be addressed. |
Monday, November 27, 2023 2:30PM - 3:00PM |
4WRA.00002: A New Perspective of the Study of Superheavy Nuclei Invited Speaker: Kazuyuki Sekizawa What is the heaviest element that can, if it is very short lived, exist in nature? This simple, yet profound question has urged us to synthesize unknown superheavy nuclei (SHN) at terrestrial accelerator facilities all over the world. The synthesis of SHN is notoriously difficult due to its really tiny cross sections on the order of picobarn to femtobarn. While the cold fusion reactions, which take advantage of the stabilization effect of doubly-magic 208Pb or its neighbor 209Bi, reducing excitation energy of a compound system, have been successful to synthesize SHN up to the element 113, nihonium, it suffers from an exponential decrease of the cross section with increasing the proton number Z. On the other hand, the hot fusion reactions employ a neutron-rich calcium isotope, 48Ca, as a projectile with an actinide target, leading to higher excitation energy as compared to the cold one, while subsequent neutron evaporation successfully cools it down. The latter sustain picobarn-level cross sections even for Z >113 and up to the element 118, oganneson, have been synthesized so far. Although those artificially synthesized SHN are short-lived, their chemical as well as nuclear properties are of great interests, offering a unique opportunity to challenge our theoretical understanding. |
Monday, November 27, 2023 3:00PM - 3:30PM |
4WRA.00003: Experimental studies of fission mechanism Invited Speaker: Kentaro Hirose The multi-nucleon transfer reaction (MNT) is a powerful tool to populate a variety of nuclides with a wide range of excitation energy. At the JAEA Tokai tandem accelerator facility, we have been studying fission mechanism through fission observables such as fission-fragment mass distributions, fission probabilities, prompt-fission neutrons, and so on. |
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