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 D10: Nuclear Structure II
9:00 AM–11:45 AM,
Wednesday, November 29, 2023
Hilton Waikoloa Village
Room: Kohala 3
Chair: Aaron Gallant, Lawrence Livermore Natl Lab
Abstract: D10.00001 : Half-life measurement of isomeric state in 25Si*
9:00 AM–9:15 AM
Presenter:
Daiki Nishimura
(Tokyo City University)
Authors:
Daiki Nishimura
(Tokyo City University)
Mitsumori Fukuda
(Osaka University)
Mei Amitani
(Tokyo City University)
Chihaya Fukushima
(Tokyo City University)
Takuji Izumikawa
(Institute for Research Promotion, Niigata University)
Atsushi Kitagawa
(QST)
Mototsugu Mihara
(Osaka University)
Eri Miyata
(Department of Physics, Niigata University)
Yuki Nakamura
(Tokyo City University)
Takashi Ohtsubo
(Deparment of Physics, Niigata University)
Takeshi Suzuki
(Saitama University)
Maya Takechi
(Department of Physics, Niigata University)
Masaomi Tanaka
(Kyushu University)
Takayuki Yamaguchi
(Saitama University)
A secondary beam including 25Si was produced by the projectile fragmentation of a 300-MeV/nucleon primary beam of 28Si on a 20-mm-thick CH2 target. The secondary beam was separated and identified by using the SB2 beamline and was implanted in an active stopper consisting of three plastic scintillators. The γ rays were measured with three kinds of detectors surrounding the stopper, four LaBr3(Ce) detectors, a HPGe detector, and a NaI(Tl) detector. By observing the delayed γ rays with these detectors, the half-life of 40-keV isomeric state in 25Si has successfully been determined for the first time. We will discuss the deduced transition probability of the isomeric state in comparison with the isomeric state in the mirror nucleus of 25Na and theoretical predictions.
*This work was partly supported by JSPS KAKENHI Grant Number JP22H01230.
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