Experimental study of β-delayed proton decay of 23Al for nucleosynthesis in novae

被引：47

作者：

Saastamoinen, A. ^{[1
]}

Trache, L. ^{[2
]}

Banu, A. ^{[2
]}

Bentley, M. A. ^{[3
]}

Davinson, T. ^{[4
]}

Hardy, J. C. ^{[2
]}

Iacob, V. E. ^{[2
]}

McCleskey, M. ^{[2
]}

Roeder, B. T. ^{[2
]}

Simmons, E. ^{[2
]}

Tabacaru, G. ^{[2
]}

Tribble, R. E. ^{[2
]}

Woods, P. J. ^{[4
]}

Aysto, J. ^{[1
]}

机构：

[1] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland

[2] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

[3] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[4] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland

来源：

PHYSICAL REVIEW C | 2011年 / 83卷 / 04期

基金：

芬兰科学院;

关键词：

EMISSION;

D O I：

10.1103/PhysRevC.83.045808

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 beta-delayed gamma and proton decay of Al-23 has been studied with an alternative detector setup at the focal plane of the momentum achromat recoil separator MARS at Texas A&M University. We could detect protons down to an energy of 200 keV and determine the corresponding branching ratios. Contrary to results of previous beta-decay studies, no strong proton intensity from the decay of the isobaric analog state (IAS) of the Al-23 ground state at E-x = 7803 keV in Mg-23 was observed. Instead we assign the observed low-energy group E-p,E-c.m. = 206 keV to the decay from a state that is 16 keV below the IAS. We measured both proton and gamma branches from the decay of this state at E-x = 7787 keV in Mg-23, which is a very rare case in the literature. Combining our data with its measured lifetime, we determine its resonance strength to be omega gamma = 1.4(-0.4)(+0.5) meV. The value is in agreement with older direct measurements, but disagrees with a recent direct measurement. This state is the most important resonance for the radiative proton capture Na-22(p, gamma)Mg-23 in some astrophysical environments, such as novae.

引用

页数：10

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