2008/04/11 by D. Schuermann, Dirk Schürmann, R. Kunz +8 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Advanced Chemical Physics Studies #Atmospheric Ozone and Climate #Nuclear physics research studies #nucl-ex
paper · pdf · doi:10.1103/physrevc.77.055803
published as Phys.Rev.C77:055803,2008 · 7 pages, 9 figures, accepted for publication in PRC
arxiv created 2008/04/11 · openalex publication_date 2008/05/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report on a new lifetime measurement of the Ex=6792 keV state in 15O via the Doppler-shift attenuation method at the E=259 keV resonance in the reaction 14N(p,\ensuremathγ)15O. This subthreshold state is of particular importance for the determination of the ground state astrophysical S factor of 14N(p,\ensuremathγ)15O at stellar energies. The measurement technique has been significantly improved over that used in previous work. The conclusion of a finite lifetime drawn there cannot be confirmed with the present data. In addition, the lifetimes of the two states at Ex=5181 and 6172 keV have been measured with the same technique in order to verify the experimental method. We observe an attenuation factor F(\ensuremathτ)>0.98 for the Ex=6172 and 6792 keV states, respectively, corresponding to \ensuremathτ<0.77 fs. The attenuation factor for the Ex=5181 keV state results in F(\ensuremathτ)=0.78\ifmmode±\else\textpm\fi0.02 corresponding to \ensuremathτ=8.4\ifmmode±\else\textpm\fi1.0 fs, which is in excellent agreement with literature.