Isomer production ratio of the Cd112(n,γ)Cd113 reaction in an s-process branching point

Takehito Hayakawa, Yosuke Toh, Atsushi Kimura, Shoji Nakamura, Toshiyuki Shizuma, Nobuyuki Iwamoto, Satoshi Chiba, and Toshitaka Kajino
Phys. Rev. C 103, 045801 – Published 5 April 2021

Abstract

A β-decay unstable isomer with a half-life of 14.1 yr at 264 keV in Cd113 is a branching point in the s process, from which a weak branch reaches to a rare tin isotope Sn115 whose astrophysical origin has been an open problem. We have measured γ rays decaying to the ground state or the isomer in the Cd112(n,γ)Cd113 reaction using high-energy resolution detectors in conjunction with a time-of-flight method. The relative production ratios of the isomer to the total following the neutron capture reactions on Cd112 have been evaluated in an energy region of up to 9 keV, and the spin and parity of several resonances have been assigned.

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  • Received 21 October 2020
  • Accepted 22 March 2021

DOI:https://doi.org/10.1103/PhysRevC.103.045801

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Takehito Hayakawa1,2,*, Yosuke Toh3, Atsushi Kimura3, Shoji Nakamura3, Toshiyuki Shizuma4, Nobuyuki Iwamoto3, Satoshi Chiba5, and Toshitaka Kajino6,7,8

  • 1National Institutes for Quantum and Radiological Science and Technology, Tokai, Ibaraki 319-1106, Japan
  • 2Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan
  • 3Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 4National Institute for Quantum and Radiological Science and Technology, Tokai, Ibaraki 319-1106, Japan
  • 5Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 113-0033, Japan
  • 6Beihang University, School of Physics, International Center for Big-Bang Cosmology and Element Genesis, Beijing 100083, P. R. China
  • 7National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
  • 8The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

  • *hayakawa.takehitio@qst.go.jp

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Vol. 103, Iss. 4 — April 2021

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