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Eur. Phys. J. A 36, 1-5 (2008)
DOI: 10.1140/epja/i2007-10554-7
A study of the proton resonant property in 22Mg by elastic scattering of 21Na + p and its astrophysical implication in the 18Ne(α, p)21Na reaction rate
J. J. He1, S. Kubono1, T. Teranishi2, M. Notani1, H. Baba1, S. Nishimura3, J. Y. Moon4, M. Nishimura3, S. Michimasa1, H. Iwasaki3, Y. Yanagisawa3, N. Hokoiwa2, M. Kibe2, J. H. Lee4, S. Kato5, Y. Gono2 and C. S. Lee41 Center for Nuclear Study, University of Tokyo (CNS), Wako Branch. 2-1 Hirosawa, 351-0198, Wako, Saitama, Japan
2 Department of Physics, Kyushu University, 6-10-1 Hakozaki, 812-8581, Fukuoka, Japan
3 RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, 351-0198, Wako, Saitama, Japan
4 Department of Physics, Chung-Ang University, 156-756, Seoul, Republic of Korea
5 Department of Physics, Yamagata University, 990-8560, Yamagata, Japan
hjianjun@ph.ed.ac.uk
(Received 18 October 2007 / Published online 3 April 2008)
Abstract
Proton resonances in 22Mg have been investigated by the resonant elastic scattering of 21 Na + p. The 21Na beam with a mean energy of 4.00 MeV/nucleon was separated by the CNS radioactive-ion-beam separator (CRIB) and bombarded a thick (CH2)n target. The energy spectra of recoiled protons were measured at scattering angles of θc.m. ≈ 172° , 146° , respectively. Several excited states observed before have been confirmed including two states (at 6.616, 6.796 MeV) observed at TRIUMF. A new state at 7.06 MeV has been observed, and another new one at 7.28 MeV is tentatively identified due to its low statistics. The proton resonant parameters were deduced from an R-matrix analysis of the differential cross-section data with a SAMMY-M6-BETA code. The astrophysical implication for the 18 Ne(α, p)21 Na reaction has been briefly discussed.
PACS25.60.-t - Reaction induced by unstable nuclei.
23.50.+z - Decay by proton emission.
26.50.+x - Nuclear physics aspects of novae, supernovae, and other explosive environments. Correspondence: hjianjun@ph.ed.ac.uk
Communicated by E. Bellotti
© Società Italiana di Fisica, Springer-Verlag 2008