Photoactivation of Long-Lived Isomers and its Relevance to Nuclear Structure Physics, γ-LASER Schemes, and Nucleosynthesis

Details Photoactivation of Long-Lived Isomers and its Relevance to Nuclear Structure Physics, γ-LASER Schemes, and Nucleosynthesis Photoactivation of Long-Lived Isomers and its Relevance to Nuclear Structure Physics, γ-LASER Schemes, and Nucleosynthesis

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cgrs.conf...69k&link_type=abstract

CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS. Proceedings of the Eleventh International Symposium. Held 2-6 September 2002

Astronomy and Astrophysics

Astrophysics

Scientific paper

Results are presented from experiments recently performed at the well-established bremsstrahlung facilities of the 4.3 MV Stuttgart DYNAMITRON accelerator. The surprisingly strong population of spin isomers in odd-mass nulclei near shell closures in photo-induced reactions have been studied by photoactivation and Nuclear Resonance Fluorescence (NRF) experiments on 113, 115In (Z=49), 87Sr (N=49), and in 135,137Ba (N=79, 81). The generation of a population inversion of low-lying excited nuclear levels by feeding from higher-lying photo-excited states could be demonstrated for the first time by NRF experiments on 103Rh. Such an inversion is the precondition for possible γ-ray laser schemes. The puzzling nucleosynthesis of nature's rarest isotope 180Ta was studied by measuring the depopulation of the quasistable isomer in 180Ta (Jπ = 9-, t1/2 ≥ 1015 yr) by resonant photoabsorption. The new results indicate a dramatic acceleration of the isomer decay to the short-lived Jπ = 9+ ground state (t1/2 = 8.1 h) under stellar s-process conditions. The astrophysical consequences and nuclear structure effects are discussed.

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