β-decay rate of 79mSe and its consequences for the s-process temperature

Details β-decay rate of 79mSe and its consequences for the s-process temperature β-decay rate of 79mSe and its consequences for the s-process temperature

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phrvc..38..295k&link_type=abstract

Physical Review C (Nuclear Physics), Volume 38, Issue 1, July 1988, pp.295-306

Physics

Nuclear Physics

29

Beta Decay, Double Beta Decay, Electron And Muon Capture, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The branching ratio between internal electromagnetic transitions and β- decays of the isomer 79mSe was determined experimentally. Extremely clean samples of 78Se were activated with thermal neutrons at a high-flux reactor. A mini-orange-Si (Li) detection system was used to measure β- particles and conversion electrons immediately after neutron irradiation. For the β- decay we obtain logft=4.70+0.10-0.09. Our present result was used to recalculate the temperature dependence of the effective β- half-life of 79Se in the stellar interior. In combination with the half-life deduced from a quantitative branching analysis, we obtain a possible temperature range between 182 and 295 million degrees for the weak component of the s process.

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