Decay property of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Na</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>20</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> 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; T. Kajino

doi:10.1103/PhysRevC.46.361

Decay property of ${}^{20}{Na}$ 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

Abstract

The decay property of ${}^{20}{Na}$ was studied using a ${}^{20}{Mg}$ 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 ${}^{20}{Na}$ . 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 ${}^{19}{Ne}$ +p as was expected before. The half-life time of ${}^{20}{Mg}$ is determined to be 114±17 ms. The stellar reaction rate of ${}^{19}{Ne}$ (p,γ $)^{20}$ Na is also discussed based on the present experimental result.

Received 12 December 1991

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

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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