RIBF Nuclear Physics Seminar

Determination of the neutron dripline at fluorine and neon and discovery of 39Na conducted at RIKEN RIBF

Name: Determination of the neutron dripline at fluorine and neon and discovery of 39Na conducted at RIKEN RIBF
Start: 2023-10-31T13:30:00+09:00
End: 2023-10-31T15:00:00+09:00
Location: No location set

by Toshiyuki Kubo (RIKEN Nishina Center)

Tuesday 31 Oct 2023, 13:30 → 15:00 Asia/Tokyo

Description

=Date and Place=

Oct. 31st (Tue) 2023 , 13:30~ via Hybrid (Zoom + RIBF Hall)

=Lecturer=

Dr. Toshiyuki Kubo

(Nishina Center, for the RIKEN RIBF new isotope collaboration)

=Title=

Determination of the neutron dripline at fluorine and neon and discovery of 39Na conducted at RIKEN RIBF

=Abstract=

I will talk about the recent new-isotope experiments conducted at RIKEN RIBF [1] using the BigRIPSseparator [2] and an intense 48Ca beam at 345 MeV/u, in which we searched for the new isotopes 32,33F, 35,36Ne, and 38,39Na located close to the neutron-rich limit of existence. The experiments allowed the first determination of the neutron dripline at fluorine and neon to be 31F and 34Ne, respectively [3] and the discovery of an extremely neutron-rich isotope 39Na with neutron number N = 28 [4]. These results provide us with a key to understanding the nuclear structure under such extremely neutron-rich conditions. The location of neutron dripline and the nuclear binding close to the limit of existence are determined reflecting details of underlying nuclear structure, such as the evolution of nuclear shell property and associated nuclear deformation. The nuclear deformation, caused by the magicityloss at N = 20 and 28, plays a key role in the nuclear binding in this region and thus in determining the particle stability of 39Na as well as the location of the neutron dripline at 31F and 34Ne. I will try to outline the discussions of such intriguing nuclear structure as well as overview the experiments.

[1] Y. Yano, Nucl. Instrum. Methods Phys. Res., Sect. B 261, 1009 (2007).

[2] T. Kubo, Nucl. Instrum. Methods Phys. Res., Sect. B 204, 97 (2003).

[3] D. S. Ahn, N. Fukuda, H. Geissel, N. Inabe, N. Iwasa, T. Kubo, K. Kusaka, D. J. Morrissey, D. Murai, T. Nakamura, M. Ohtake, H. Otsu, H. Sato, B. M. Sherrill, Y. Shimizu, H. Suzuki, H. Takeda, O. B. Tarasov, H. Ueno, Y. Yanagisawa, K. Yoshida, Phys. Rev. Lett. 123, 212501 (2019).

[4] D. S. Ahn, J. Amano, H. Baba, N. Fukuda, H. Geissel, N. Inabe, S. Ishikawa, N. Iwasa, T. Komatsubara, T. Kubo, K. Kusaka, D. J. Morrissey, T. Nakamura, M. Ohtake, H. Otsu, T. Sakakibara, H. Sato, B. M. Sherrill, Y. Shimizu, T. Sumikama, H. Suzuki, H. Takeda, O. B. Tarasov, H. Ueno, Y. Yanagisawa, K. Yoshida, Phys. Rev. Lett. 129, 212502 (2022).

Reference: Isotope News No. 789, pp. 2-7.(Japanese only)