Short-Lived Radioisotope Tc98 Synthesized by the Supernova Neutrino Process

Takehito Hayakawa, Heamin Ko, Myung-Ki Cheoun, Motohiko Kusakabe, Toshitaka Kajino, Mark D. Usang, Satoshi Chiba, Ko Nakamura, Alexey Tolstov, Ken’ichi Nomoto, Masa-aki Hashimoto, Masaomi Ono, Toshihiko Kawano, and Grant J. Mathews
Phys. Rev. Lett. 121, 102701 – Published 4 September 2018

Abstract

The isotope Tc98 decays to Ru98 with a half-life of 4.2×106yr and could have been present in the early Solar System. In this Letter, we report on the first calculations of the production of Tc98 by neutrino-induced reactions in core-collapse supernovae (the ν process). Our predicted Tc98 abundance at the time of solar system formation is not much lower than the current measured upper limit raising the possibility for its detection in the not too distant future. We show that, if the initial abundance were to be precisely measured, the Tc98 nuclear cosmochronometer could be used to evaluate a much more precise value of the duration time from the last core-collapse supernova to the formation of the solar system. Moreover, a unique and novel feature of the Tc98 ν-process nucleosynthesis is the large contribution (20%) from charged current reactions with electron antineutrinos. This means that Tc98 becomes a unique new ν-process probe of the temperature of the electron antineutrinos.

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  • Received 4 August 2017
  • Revised 28 December 2017

DOI:https://doi.org/10.1103/PhysRevLett.121.102701

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & AstrophysicsNuclear Physics

Authors & Affiliations

Takehito Hayakawa*

  • National Institutes for Quantum and Radiological Science and Technology, 2-4 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan and National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan

Heamin Ko and Myung-Ki Cheoun

  • Soongsil University, Seoul 156-743, Korea

Motohiko Kusakabe

  • Beihang University, 37 Xueyuan Road, Haidian-qu, Beijing 100083, China

Toshitaka Kajino

  • Beihang University, 37 Xueyuan Road, Haidian-qu, Beijing 100083, China; National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan and The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

Mark D. Usang and Satoshi Chiba

  • Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro, Tokyo 113-0033, Japan

Ko Nakamura

  • Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan

Alexey Tolstov and Ken’ichi Nomoto

  • Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan

Masa-aki Hashimoto

  • Department of Physics, Kyushu University, Fukuoka 819-0395, Japan

Masaomi Ono

  • RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan

Toshihiko Kawano

  • Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Grant J. Mathews

  • University of Notre Dame, Notre Dame, Indiana 46556, USA

  • *hayakawa.takehito@qst.go.jp

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Issue

Vol. 121, Iss. 10 — 7 September 2018

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