Eur. Phys. J. A (2008) 36: 1-5
https://doi.org/10.1140/epja/i2007-10554-7

Letter

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

¹ 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

^* e-mail: hjianjun@ph.ed.ac.uk

Received: 18 October 2007
Accepted: 12 March 2008
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 ( CH_{2 n} target. The energy spectra of recoiled protons were measured at scattering angles of θ_c.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.