Decay property of Na20 for the onset mechanism of the rapid-proton process

S. Kubono, N. Ikeda, Y. Funatsu, M. H. Tanaka, T. Nomura, H. Orihara, S. Kato, M. Ohura, T. Kubo, N. Inabe, A. Yoshida, T. Ichihara, M. Ishihara, I. Tanihata, H. Okuno, T. Nakamura, S. Shimoura, H. Toyokawa, C. C. Yun, H. Ohnuma, K. Asahi, A. Chakrabarti, T. Mukhopadhyay, and T. Kajino
Phys. Rev. C 46, 361 – Published 1 July 1992
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Abstract

The decay property of Na20 was studied using a Mg20 beam to learn better the onset mechanism of the rapid-proton process. The delayed protons were successfully measured, which correspond to one of the possible 1+ states in Na20. There is no clear beta decay to the first excited 1+ state above the proton threshold, suggesting that this state would not be the s-wave resonance in the thermal reaction of Ne19+p as was expected before. The half-life time of Mg20 is determined to be 114±17 ms. The stellar reaction rate of Ne19(p)20Na is also discussed based on the present experimental result.

  • Received 12 December 1991

DOI:https://doi.org/10.1103/PhysRevC.46.361

©1992 American Physical Society

Authors & Affiliations

S. Kubono, N. Ikeda, Y. Funatsu, M. H. Tanaka, T. Nomura, H. Orihara, S. Kato, M. Ohura, T. Kubo, N. Inabe, A. Yoshida, T. Ichihara, M. Ishihara, I. Tanihata, H. Okuno, T. Nakamura, S. Shimoura, H. Toyokawa, C. C. Yun, H. Ohnuma, K. Asahi, A. Chakrabarti, T. Mukhopadhyay, and T. Kajino

  • Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo, 188 Japan
  • The Cyclotron and Radioisotope Center, Tohoku University, Sendai, 980 Japan
  • Department of Physics, Yamagata University, Yamagata, 990 Japan
  • RIKEN, Wako, Saitama, 351-01 Japan
  • Department of Physics, Univeristy of Tokyo, Bunkyo, Tokyo, 113 Japan
  • Tandem Accelerator Center, University of Tsukuba, Tsukuba, Ibaraki, 305 Japan
  • Department of Physics, Tokyo Institute of Technology, Megro, Tokyo, 152 Japan
  • Department of Applied Physics, Tokyo Institute of Technology, Megro, Tokyo, 152 Japan
  • Bhabha Institute, Calcutta, India
  • Department of Physics, Tokyo Metropolitan University, Hachiohji, Tokyo, 192 Japan

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Vol. 46, Iss. 1 — July 1992

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