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Spectroscopy of neutron-rich nuclei produced by multinucleon transfer reactions at KISS

Year: 2024
Type: article
Abstract: \nProperties such as lifetimes and masses of neutron-rich nuclei are key parameters for elucidating the astrophysical rapid neutron capture process (r-process). Due to the lack of experimental nuclear data in the relevant extremely neutron-rich region, especially near and above N = 126, the predictions of theoretical nuclear models are crucial for simulating r-process nucleosynthesis. Experimental studies of the properties and structures of neutron-rich nuclei from near the β stability line up to the r-process path provide important inputs to these theoretical models, improving the accuracy of predictions for the nuclear properties involved in the rprocess. We are developing the KEK Isotope Separation System (KISS) at the RIKEN RIBF facility to produce and separate these nuclei to perform spectroscopy experiments. The nuclei of interest are produced by multinucleon transfer reactions, which have been recently attracting renewed interest as they provide a way to access neutron-rich nuclei that are difficult to produce by other methods such as complete fusion or fragmentation. We have performed nuclear and laser spectroscopy, lifetime and mass measurements of neutron-rich nuclei of refractory elements near the N = 126 region using 198,natPt, natTa, natW, and natIr targets irradiated with 136Xe beams. We also extend our spectroscopic studies into the neutron-rich actinide region using 238U beams. This paper introduces the KISS facility and provides an overview of the nuclear spectroscopy experiments carried out there. We also introduce the KISS-1.5 project, which was started in FY2024 to further extend the research into the neutron-rich region.\n
DOI: 10.1051/epjconf/202430601016/pdf
Authors: Yutaka Watanabe, Yoshikazu Hirayama, Momo Mukai, Toshitaka Niwase, Peter Schury, Marco Rosenbusch, Hironobu Ishiyama, Sun-Chan Jeong, Hiroari Miyatake, Michiharu Wada, Sota Kimura, Shun Iimura, Jun Young Moon, Takashi Hashimoto, Akihiro Taniguchi
Institutions: High Energy Accelerator Research Organization, Nagoya University, Kyushu University, RIKEN Nishina Center, Rikkyo University, Institute for Basic Science, Kyoto University, Institute for Integrated Radiation and Nuclear Science, Kyoto University
Language: English
Open Access status: green
Awards: Extended study of the origins of heavy elements via comprehensive mass measurement of short-lived nuclides, Production and separation of the nuclides near to the neutron number 126 on the r-process path, Study of neutron-rich actinide isotopes toward elucidation of the r-process termination, Production of unexplored nuclei and their multifaceted precise nuclear spectroscopy using a new method for elucidating the astrophysical environment of the r-process., Beta-decay spectroscopy of waiting-point nuclei in the third peak of element abundance pattern produced by r-process, Study of the origin of heavy elements using an innovative mass spectrograph, How is the rapid neutron capture process terminated ? -Pioneering research with delayed fission spectroscopies-, Understanding of the r-process environment through the precise nuclear spectroscopic works of the unknown nuclei in the vicinity of neutron magic number N=126, Precision mass measurement of neutron-rich transuranium isotopes by multinucleon transfer reaction, Pioneering mass measurement research of r-process nuclei in the blank spot region, Development of high efficient gas cell for collecting the r-process nuclei around N=126 and producing the high purity beam of the nuclei
OpenAlex ID: W6959729932
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