Lifetime of the 6793-keV State in 15O -: art. no. 152501

被引：67

作者：

Bertone, PF ^{[1
]}

Champagne, AE

Powell, DC

Iliadis, C

Hale, SE

Hansper, VY

机构：

[1] Univ N Carolina, Chapel Hill, NC 27599 USA

[2] Triangle Univ Nucl Lab, Durham, NC 27088 USA

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.87.152501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The energy derived from the CN cycle at low stellar temperatures is regulated by the N-14(p,gamma)O-15 reaction. A previous direct measurement of this reaction has been interpreted as showing evidence for a subthreshold resonance which makes a major contribution to the reaction rate at low temperatures. This resonance, at E-c.m. = -504 keV would correspond to the known E-x = 6793-keV state in O-15. We have measured a mean lifetime of 1.60(-0.72)(+0.75) fs (90% C.L.) for this state using the Doppler-shift attenuation method. This lifetime is a factor of 15 longer than that inferred from the (p,gamma) data and implies that the contribution of the subthreshold resonance is negligible.

引用

页码：152501 / 152501

页数：4

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