Lifetime measurement of the 6792 keV state in 15O, important for the astrophysical S factor extrapolation in 14N(p,g)15O
| Autor: | Schuermann, D., Kunz, R., Lingner, I., Rolfs, C., Schuemann, F., Strieder, F., Trautvetter, H. -P. |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Phys.Rev.C77:055803,2008 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.77.055803 |
| Popis: | 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. Comment: 7 pages, 9 figures, accepted for publication in PRC |
| Databáze: | arXiv |
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