Investigation of excited states in Mg22 via resonant elastic scattering of Na21+p and its astrophysical implications

J. J. He, S. Kubono, T. Teranishi, J. Hu, M. Notani, H. Baba, S. Nishimura, J. Y. Moon, M. Nishimura, H. Iwasaki, Y. Yanagisawa, N. Hokoiwa, M. Kibe, J. H. Lee, S. Kato, Y. Gono, and C. S. Lee
Phys. Rev. C 80, 015801 – Published 6 July 2009

Abstract

The excited states in Mg22 have been investigated by the resonant elastic scattering of Na21+p. A 4.0 MeV/nucleon Na21 beam was separated by the Center for Nuclear Study (CNS) radioactive ion beam separator (CRIB) and then used to bombard a thick (CH2)n target. The energy spectra of recoiled protons were measured at scattering angles of θc.m.172,146, and 134, respectively. A wide energy-range of excitation function in Mg22 (up to Ex~8.9 MeV) was obtained simultaneously with a thick-target method, and a state at 7.06 MeV was newly observed. The resonant parameters were deduced from an R-matrix analysis of the center-of-mass (c.m.) differential cross-section data with a SAMMY-M6-BETA code. The astrophysical resonant reaction rate for the Ne18(α,p)Na21 reaction was recalculated based on the present parameters. Generally speaking, the present rates are much smaller than the previous ones.

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  • Received 18 January 2009

DOI:https://doi.org/10.1103/PhysRevC.80.015801

©2009 American Physical Society

Authors & Affiliations

J. J. He1, S. Kubono2, T. Teranishi3, J. Hu1, M. Notani2, H. Baba2, S. Nishimura4, J. Y. Moon5, M. Nishimura4, H. Iwasaki4, Y. Yanagisawa4, N. Hokoiwa3, M. Kibe3, J. H. Lee5, S. Kato6, Y. Gono3, and C. S. Lee5

  • 1Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
  • 2Center for Nuclear Study (CNS), University of Tokyo, Wako Branch at RIKEN, Saitama 351-0198, Japan
  • 3Department of Physics, Kyushu University, Fukuoka 812-8581, Japan
  • 4RIKEN (The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan
  • 5Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea
  • 6Department of Physics, Yamagata University, Yamagata 990-8560, Japan

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Vol. 80, Iss. 1 — July 2009

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