Abstract
The short-lived unstable isotopes with half-lives of 0.1–10 My have been used as nuclear cosmochronometers to evaluate from an astrophysical event such as supernova (SN) explosion or AGB s-process to the solar system formation. We have proposed shorted-lived radioisotopes of 92Nb and 98Tc as the nuclear cosmochronometers for supernova neutrino-process
Highlights
A huge number of neutrinos emitted in core-collapse supernova (SN) explosions (ν process) [1] play an important role in stellar nucleosyntheses of rare some nuclides such as 7Li, 11B, 19F, 138La, and 180Ta [1,2,3,4]
In principle, generated by the ν process in SNe but the produced abundances are smaller than production by other major processes such as the s or r process by a few orders of magnitude
Short-lived unstable isotopes with half-lives of 106−108 y have been used as nuclear cosmochronometers to evaluate the time from an astrophysical event such as an AGB sprocess or a SN explosion to the solar system formation (SSF) [5,6,7,8]
Summary
A huge number of neutrinos emitted in core-collapse supernova (SN) explosions (ν process) [1] play an important role in stellar nucleosyntheses of rare some nuclides such as 7Li, 11B, 19F, 138La, and 180Ta [1,2,3,4]. The ν process can only play a significant role in the synthesis of a rare isotope when the isotope is not produced by the major processes. Short-lived unstable isotopes with half-lives of 106−108 y have been used as nuclear cosmochronometers to evaluate the time from an astrophysical event such as an AGB sprocess or a SN explosion to the solar system formation (SSF) [5,6,7,8]. Hayakawa et al [14] have proposed the ν process origin for 92Nb. the radioisotope 98Tc (T1/2 = 4.2×106 y) is another candidate for the ν-process cosmochronometer [15], only an upper limit of 98Tc/98Ru < 6×10−5 has been reported [16] for the 98Tc initial abundance at the SSF
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