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 2WFA: Time-Dependent Approaches in Nuclear Physics IInvited Workshop
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Chair: Pablo Giuliani, Facility for Rare Isotopes Beams Room: Hilton Waikoloa Village Queens 5 |
Sunday, November 26, 2023 2:00PM - 2:30PM |
2WFA.00001: Dynamical Effects in Fission Process by the Langevin Equation Invited Speaker: Yoshihiro Aritomo After the discovery of nuclear fission by Hahn and Strassmann in 1939, Petrzhak and Flerov discovered the spontaneous and low-energy fission of 238U in 1940. In the 1960s, studies on fission became prevalent with the development of new devices and experimental techniques. Strutinsky reported the precise estimation of nuclear energy by considering microscopic shell effects, which drastically alter the landscape of the potential energy surface. Various kinds of fission phenomena become prominent. |
Sunday, November 26, 2023 2:30PM - 3:00PM |
2WFA.00002: Microscopic Evidence for Scission Neutrons Invited Speaker: Ibrahim A Abdurrahman We present the first fully unrestricted microscopic calculation showing evidence for the existence of scission neutrons (SNs). In this contribution, we will show the results for the fission of 236U∗, 240Pu∗, and 252Cf within the time-dependent superfluid local density approximation (TDSLDA). We found a universal SN signal at the neck rupture across all trajectories examined so far, with three distinct neutron "clouds" emitted: two along the fission axis in front of the fission fragments (FFs), and one perpendicular to the axis of fission. We show there is a significant SN component to the prompt fission neutron (PFN) emission of ∼ 5 − 15% and that such neutrons are emitted with considerably higher kinetic energies than other PFNs. This phenomenon can partially account for the underestimation of the prompt fission neutron spectra at higher energies in some current phenomenological models. Additionally, we discuss some features of the neck rupture, including it's characteristic timescale, the evolution of the "formation" point, and the relationship between the rupture and SNs, particularly in connection with historically proposed mechanisms for SN emission. We also investigated charge emission at fission, which can act as an upper limit on ternary fission. Future studies can be improved by the inclusion of bigger lattices, more trajectories, and the inclusion of fluctuations. |
Sunday, November 26, 2023 3:00PM - 3:30PM |
2WFA.00003: Quantum states from normalizing flows Invited Speaker: Yukari Yamauchi First-principles calculations of non-equilibrium properties of many-body quantum systems via the Hamiltonian formulation in general demand a classical computational resource that scales exponentially in the number of degrees of freedom. One way to avoid this issue is to consider a restricted subspace of the Hilbert space of the system and study time evolution within that subspace, while providing a reliable quantification of uncertainties arising from the reduction of the Hilbert space. Recently, methods of neural network quantum states have been developed as a framework for representing a large subspace of the Hilbert space efficiently with the help of tools from machine learning. In this talk, I will discuss a method for simulating the time evolution of quantum mechanical systems via neural network quantum states with the help of normalizing flows. |
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