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arXiv 0804.1934nucl-ex
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~(15)O中6792 keV态的寿命测量,对~(14)N(p,g)~(15)O中天体物理S因子外推是重要的

Lifetime measurement of the 6792 keV state in 15O, important for the astrophysical S factor extrapolation in 14N(p,g)15O

D. Schuermann, R. Kunz, I. Lingner, C. Rolfs, F. Schuemann, F. Strieder, H. -P. Trautvetter

摘要:

本文报道了用多普勒频移衰减方法在E = 259keV共振下测量14N(p,g)15O中E_x = 6792keV态的寿命。这个亚阈态对于测定恒星能量下14 N(p,g)15 O的基态天体物理S因子具有特别重要的意义。与以前的工作相比,测量技术得到了显着改善。得出的有限寿命的结论不能用目前的数据来证实。此外,为了验证实验方法,用同样的方法测量了E_x = 5181和6172keV两个态的寿命。我们分别观察到E_x = 6172和6792 keV态的衰减因子F(tau)> 0.98,对应于tau <0.77 fs。对E_x = 5181keV态的衰减因子F(tau)= 0.78 +/-0.02,对应于tau = 8.4 +/-1.0fs。

英文摘要:

We report on a new lifetime measurement of the E_x=6792 keV state in 15O via the Doppler-shift attenuation method at the E=259 keV resonance in the reaction 14N(p,g)15O. This subthreshold state is of particular importance for the determination of the ground state astrophysical S factor of 14N(p,g)15O at stellar energies. The measurement technique has been significantly improved compared with previous work. The conclusion of a finite lifetime drawn there cannot be confirmed with the present data. In addition, the lifetime of the two states at E_x=5181 and 6172 keV have been measured with the same technique in order to verify the experimental method. We observe an attenuation factor F(tau)>0.98 for the E_x =6172 and 6792 keV states, respectively, corresponding to tau<0.77 fs. The attenuation factor for the E_x=5181 keV state results in F(tau)=0.78+/-0.02 corresponding to tau=8.4+/-1.0 fs in excellent agreement with literature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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