γ-ray spectroscopy study of states in 27Si relevant for the 26Alm(p,γ)27Si reaction in novae and supernovae

被引：16

作者：

Lotay, G. ^{[1
]}

Woods, P. J. ^{[1
]}

Seweryniak, D. ^{[2
]}

Carpenter, M. P. ^{[2
]}

Janssens, R. V. F. ^{[2
]}

Zhu, S. ^{[2
]}

机构：

[1] Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland

[2] Argonne Natl Lab, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW C | 2009年 / 80卷 / 05期

关键词：

PROTON THRESHOLD STATES; PRESOLAR GRAINS; AL-26;

D O I：

10.1103/PhysRevC.80.055802

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The heavy-ion, fusion-evaporation reaction C-12(O-16,n) was used to identify gamma-decay transitions from excited states in Si-27 above the proton threshold. The precise level energy measurements, J(pi) assignments, and lifetime measurements of astrophysically important Al-26(m)+p resonances have allowed an evaluation of the Al-26(m)(p,gamma)Si-27 reaction rate. An l(p)=0 resonance has been newly identified at a center-of-mass energy in the Al-26(m)+p system of 146.3(3) keV and is expected to dominate the rate for low stellar temperatures. In addition, an l(p)=1 resonance has been identified at 378.3(30) keV and is likely to dominate the rate at high astrophysical temperatures, such as those found in oxygen-neon novae and core-collapse supernovae.

引用

页数：9