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Excited states and $$gamma$$-ray transition probability on $$^{180}$$Ta and its effects to supernova neutrino process and s-process

Hayakawa, Takehito; Chiba, Satoshi; Kajino, Toshitaka*; Mathews, G. J.*; Mohr, P.*

We have discuss nuclear structure of $$^{180}$$Ta, excited states and $$gamma$$ transition probabilities, and its effects to supernova neutrino nucleosynthesis and slow neutron capture reaction processes. The ground state of $$^{180}$$Ta beta decays with a half-life of about 8 hours, whereas an isomer at 77 keV is meta-stable state. In hot temperature environments in stars, the ground state and the isomer are linked through highly excited states by ($$gamma$$, $$gamma$$') reactions.



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