2019 Impact factor 2.176
Hadrons and Nuclei


Eur. Phys. J. A 14, 275-278 (2002)
DOI: 10.1140/epja/i2002-10024-x

Short Note

Measurement of the $\chem{^{24}Mg({p},{t}){}^{22}Mg}$ reaction for the states near the $\chem{^{21}Na+p}$ threshold

S. Michimasa1, S. Kubono1, S.H. Park2, T. Teranishi1, Y. Yanagisawa3, N. Imai4, Zs. Fülöp5, X. Liu1, T. Minemura3, C.C. Yun1, J.M. D'Auria6 and K.P. Jackson7

1  Center for Nuclear Study (CNS), University of Tokyo, RIKEN Campus, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
2  School of Physics, Seoul National University, Seoul 151-747, Republic of Korea
3  RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
4  Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan
5  Institute of Nuclear Research of the Hungarian Academy of Sciences, H-4001 Debrecen, P.O. Box 51, Hungary
6  Department of Chemistry, Simon Fraser University, V5A 1S6 Burnaby, Canada
7  TRIUMF, V6T 2A3 Vancouver, Canada

mitimasa@cns.s.u-tokyo.ac.jp

(Received: 7 March 2002 Communicated by D. Guerreau)

Abstract
Differential cross-sections of the 24Mg(p, t) 22Mg reaction were measured at 34.68 MeV for the states near the proton threshold at 5.502 MeV in 22Mg. Among them, the new states at 5.962, 6.046, 6.246 and 6.323 MeV, which were reported previously, have been confirmed. Angular distributions for these states were analyzed by distorted-wave Born-approximation calculations to deduce the spins and parities. The angular distribution for the 5.714 MeV state, which is considered to be most crucial for the stellar reaction 21Na(p, $\gamma$) 22Mg, has been found to be consistent with $J^{\pi}=2^+$ assignment. The 6.046 MeV state is newly assigned to have $J^{\pi}=0^+$, and the 5.962 MeV state is tentatively assigned to have $J^{\pi}=(1^-)$. These two states will also play an important role for 22Mg production in novae.

PACS
21.10.Hw - Spin, parity, and isobaric spin.
25.40.Hs - Transfer reactions.
26.30.+k - Nucleosynthesis in novae, supernovae and other explosive environments.
27.30.+t - $20 \le A \le 38$ .

© Società Italiana di Fisica, Springer-Verlag 2002