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04 07, 2023
Seminar: Spin-Isospin Excitations to Unveil the R-process Nucleosynthesis
Title: Spin-Isospin Excitations to Unveil the R-process Nucleosynthesis
Speaker: Prof. Kenichi Yoshida, Osaka University
Time: 10:30 am, Jul. 4 (Tuesday), 2023
Place: Meeting room on the 6th floor, Technique Building
Abstract:
A quantitative understanding of the r-process nucleosynthesis requires nuclear data across the nuclear chart including the vicinity of the neutron drip line, which are experimentally inaccessible. The nuclear theory thus plays a decisive role to bridge between nuclear experiments at RI beam facilities and microscopic inputs of the r-process simulation. A condition of the r-process is given by an astrophysical environment of explosive phenomena with some possible scenarios. While nuclear physics that enters the reaction network may depend on the scenario, the most important nuclear data are the nuclear masses, beta-decay properties, and neutron capture rates. The nuclear energy-density functional (EDF) approach is a possible theoretical model to describe these nuclear properties in a wide mass region of the nuclear chart in a single framework. In this seminar, after highlighting the achievements of the nuclear EDF approach for spin-isospin excitations, I will discuss the roles of nuclear deformation and neutron excess and their impact on the beta-decay rates.
About the speaker:
Kenichi Yoshida received his Ph.D. at Kyoto University in 2007. Later, he worked as a postdoc at Kyoto University (from 2007 to 2008) and at RIKEN (from 2008 to 2011). He worked as an Assistant Professor at Niigata University from 2011 to 2017. Then he moved to Kyoto University and worked there for 6 years. He became Associate Professor at Osaka University in February, 2023. Prof. Yoshida’s research interest is in nuclear many-body problems, in particular collective motions in finite nuclei. In the framework of the nuclear energy-density functional (EDF) method, he has developed new frameworks for describing the vibrational motions in deformed neutron-rich nuclei. He has been studying low-frequency modes of excitation with an emphasis on nuclear superfluidity and the roles of deformation and excess neutrons on giant multipole resonances. He is also interested in the application of the nuclear EDF framework to the weak-interaction processes relevant to nuclear astrophysics, such as the r-process nucleosynthesis.
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