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 L02: Nuclear Radii and EOS |
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Room: Hilton Waikoloa Village Kona 1 |
Friday, December 1, 2023 9:00AM - 9:15AM |
L02.00001: Interaction Cross Sections and Neutron Skin Thicknesses of Ni Isotope Chain Miki Fukutome, Masaomi Tanaka, Mitsunori Fukuda, Maya Takechi, Daiki Nishimura, Takeshi Suzuki, Gen Takayama, Ryo Taguchi, Soshi Ishitani, Mototsugu Mihara, Kensaku Matsuta, Tetsuaki Moriguchi, Takashi Ohtsubo, Akira Ozawa, Takayuki Yamaguchi, Naoki Fukuda, Takuji Izumikawa, Hiroyoshi Sakurai, Toshiyuki Sumikama, Hiroshi Suzuki, Hiroyuki Takeda, Yoshiyuki Yanagisawa, Koichi Yoshida, Takato Sugisaki, Norihide Noguchi, Yukiya Kobayashi, Yuki Tazawa, Asahi Yano, Chihaya Fukushima, Mei Amitani The equation of state of nuclear matter(EOS), which describes the macroscopic properties of nuclei, is essential not only to describe the structure and collisions of nuclei but also to understand the scale of supernova explosions and the structure of neutron stars. Since nuclear matter is composed of two Fermi particles, protons and neutrons, the equation of state has a term that depends on the density difference between the two, which is called the symmetry energy. From previous studies, it is known that the first-order density dependence of the symmetry energy is closely related to the thickness of the neutron skin. [1] |
Friday, December 1, 2023 9:15AM - 9:30AM |
L02.00002: Charge-Changing Cross Sections for Mirror Nuclear Pair 22Ne-22Mg Soshi Ishitani, Mitsunori Fukuda, Miki Fukutome, Gen Takayama, Ryo Taguchi, Mototsugu Mihara, Kaoru Watanabe, Masaomi Tanaka, Daiki Nshimura, Hiroyuki Takahashi, Sora Sugawara, Takashi Ohtsubo, Norihide Noguchi, Kazuya Takatsu, Yukiko Ota, Takuji Izumikawa, Takeshi Suzuki, Masanori Kanda, Hibiki Seki, Naru Shinozaki, Akira Ozawa, Tetsuaki Moriguchi, Naoto Kaname, Asahi Yano, Shinji Sato, Atsushi Kitagawa, Shigekazu Fukuda To elucidate the structure of neutron-rich nuclei and neutron stars, it is crucial to determine the density derivative of the symmetry energy, represented by the parameter L, in the equation of state for asymmetric nuclear matter. This parameter L can be determined by the neutron skin thickness. |
Friday, December 1, 2023 9:30AM - 9:45AM |
L02.00003: Extraction of proton and neutron skins in 9,16C from proton elastic scattering at 300 MeV/nucleon Yohei Matsuda, Tatsuya Furuno, Takahiro Kawabata, Yukie Maeda, Hooi Jin Ong, Shinsuke Ota, Hideaki Otsu, Harutaka Sakaguchi, Satoru Terashima, Tomohiro Uesaka, Nobuhiro Yamasaki, Juzo Zenihiro Proton elastic scattering in the intermediate energy region is one of the most suitable methods to obtain the fundamental quantities of nuclei, such as radius and density distribution. To apply this method to unstable nuclei, we have launched the Elastic Scattering of Protons with Radioactive Ion Beams (ESPRI) project and constructed a recoil proton spectrometer (RPS). In the ESPRI project, we measured proton elastic scattering from carbon isotopes 9,16C at NIRS-HIMAC and RIKEN-RIBF, respectively. 9C and 16C are considered to have proton and neutron skins, respectively, and we aim to measure these skins in this study. The beam energy of unstable nuclei is about 300 MeV, and nucleons have the longest mean free path in nuclei, but there have been no experimental studies of unstable nuclei. |
Friday, December 1, 2023 9:45AM - 10:00AM |
L02.00004: Development of the Particle Identification Method by Pulse Shape Analysis in GAGG(Ce) Calorimeter Takayuki Yano, Juzo Zenihiro, Yuto Hijikata, Ryotaro Tsuji, Shingo Ogio, Tomohiro Uesaka, Junki Tanaka, Yuki Kubota, Hidetada Baba, Shoko Takeshige, Koshi Higuchi, Taiki Sugiyama, Harutaka Sakaguchi, Yohei Matsuda Proton elastic scattering is one of the best probes to determine nuclei's proton and neutron density distributions, which play an important role in studying the equation of state in asymmetric nuclear matter. |
Friday, December 1, 2023 10:00AM - 10:15AM |
L02.00005: Measurements of isomer ratios and half-life of isomeric state in 12Be Ryo Taguchi, Mitsunori Fukuda, Miki Fukutome, Gen Takayama, Masaomi Tanaka, Daiki Nishimura, Hiroyuki Takahashi, Sora Sugawara, Mototsugu Mihara, Takato Sugisaki, Soshi Ishitani, Chiaki Une, Yuki Nakamura, Chihaya Fukushima, Mei Amitani, Takashi Otsubo, Norihide Noguchi, Kazuya Takatsu, Yukiya Kobayashi, Yuki Tazawa, Yukiko Ota, Takuji Izumikawa, Takeshi Suzuki, Takayuki Yamaguchi, Yukari Koizumi, Kengo Okubo, Kenta Sasaki, Masanori Kanda, Naru Shinozaki, Akira Ozawa, Tetsuaki Moriguchi, Asahi Yano, Shinji Sato, Shigekazu Fukuda, Atsushi Kitagawa Isomeric states can have significantly different structures from the ground state, so isomeric states are interesting and important for structure. In the case of 12Be, it has an isomeric state 0+2 located about 2.3 MeV above the ground state 0+1, and the half-life of this state is 230 ns[1]. This isomeric state has two decay modes, E2 decays through an intermediate 2+1 state emitting gamma rays, or an E0 decay directly to the ground state emitting an electron-positron pair by internal pair production. Previous studies utilizing gamma ray measurements on the isomeric state of 12Be suggested the expanding nuclear radius compared to that of the ground state. This means 12Be may have a two-neutron halo in the isomeric state. We aim to measure nuclear radius directly from the reaction cross section measurements of the ground and isomeric states. However, it is impossible to produce a complete isomeric beam, we need information on the isomer ratio of the 12Be beam. In this study, at the HIMAC synchrotron facility, secondary beams of 220 MeV/u 12Be were produced from an 18O primary beam and we measured its isomer ratios. Additionally, we determined the half-life of the isomeric state with updated precision. We will present the details and results of the measurements and future plans. |
Friday, December 1, 2023 10:15AM - 10:30AM |
L02.00006: Design of a new experimental setup and simulation of neutron shielding for the very-forward-angle neutron elastic scattering Tomoya Nakada, Saya Iwai, Teppei Iwamoto, Airu Makita, Mariko Tachibana, Toi Tachibana, Tatsuya Wada, Shintaro Okamoto, Takayuki Yano, Masanori Dozono, Juzo Zenihiro Constraints on parameters of the symmetry energy are important for understanding of the nuclear many-body system which is related to various astrophysical phenomena. The symmetry energy is essential for the neutron matter, but it is less certain than the symmetric nuclear matter. It is known that there is a linear correlation between the slope parameter and neutron skin thickness δR in 208Pb. δR can be written as the difference of the neutron and proton rms radii. However, the uncertainty of the neutron radius in 208Pb is still large, while its proton radius is precisely determined by electron scattering. |
Friday, December 1, 2023 10:30AM - 10:45AM |
L02.00007: Development of the high-precision neutron elastic scattering measurements using liquid scintillators Saya Iwai, Teppei Iwamoto, Airu Makita, Tomoya Nakada, Mariko Tachibana, Toi Tachibana, Wada Tatsuya, Shintaro Okamoto, Takayuki Yano, Masanori Dozono, Juzo Zenihiro For the study of equation of state (EOS), we have developed a new experimental method to determine the neuron skin thickness. The neutron skin thickness in neutron-rich nucleus is now known to be a good measure to constrain the slope parameter L of the symmetry energy in the nuclear matter EOS. Neutron elastic scattering at very forward angles is a powerful tool to determine the neutron root-mean-square radius because it is related to the derivative of the neutron form factor at q2 ~0. From our estimation based on the RIA with a RMF density, the radius can be measured with precision of 1% if the experimental error can be reduced within 3% in the case of 208Pb. |
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