The origin of boron in the solar system has not yet been clearly understood.We studied the light mass nuclear reactions and neutrino-induced reactions that play important roles in the nucleosynthesis of A=11 nuclei in...The origin of boron in the solar system has not yet been clearly understood.We studied the light mass nuclear reactions and neutrino-induced reactions that play important roles in the nucleosynthesis of A=11 nuclei in the core-collapse supernova(CCSN).We found that the production of A=11 nuclei,particularly^(11)C,is sensitive to the radioactive nuclear reaction^(11)C(α,p)^(14)N among many others.We calculated the upper and lower limits of the^(11)C(α,p)^(14)N rate by taking account of the low energy resonances above the threshold,which have not been included in the previous SN nucleosynthesis calculations.These resonance contributions significantly change the^(11)C abundance,which decays to^(11)B with a half-life of 20.34 m,and affects the resultant isotopic abundance ratio of^(11)B/^(10)B at Mr=3.78-4.4M⊙from which the presolar X grains could form.The^(11)B/^(10)B isotopic ratio measured in X grains can help to understand the origin of solar system boron and constrain still unknown neutrino mass hierarchy if the observational and theoretical uncertainties associated with these abundances are reduced.We emphasize that the further precise experiment of measuring the^(11)C(α,p)^(14)N reaction cross sections at the astrophysically interesting energies of Gamow window 0.23-1.24 MeV,which corresponds to the effective temperature T=0.2-1 GK,could clarify CCSN contribution to the solar^(11)B/^(10)B ratio.展开更多
基金under the support of CSC scholarship from the Ministry of Education of China during his stay at the National Astronomical Observatory of Japan(NAOJ)partly supported by the National Key R&D Program of China(2022YFA1602401)+1 种基金the National Natural Science Foundation of China(12335009,12435010)supported by JSPS KAKENHI(19K03883,23H01181,23K25877)from the Ministry of Education,Culture,Sports,Science and Technology(MEXT)of Japan。
文摘The origin of boron in the solar system has not yet been clearly understood.We studied the light mass nuclear reactions and neutrino-induced reactions that play important roles in the nucleosynthesis of A=11 nuclei in the core-collapse supernova(CCSN).We found that the production of A=11 nuclei,particularly^(11)C,is sensitive to the radioactive nuclear reaction^(11)C(α,p)^(14)N among many others.We calculated the upper and lower limits of the^(11)C(α,p)^(14)N rate by taking account of the low energy resonances above the threshold,which have not been included in the previous SN nucleosynthesis calculations.These resonance contributions significantly change the^(11)C abundance,which decays to^(11)B with a half-life of 20.34 m,and affects the resultant isotopic abundance ratio of^(11)B/^(10)B at Mr=3.78-4.4M⊙from which the presolar X grains could form.The^(11)B/^(10)B isotopic ratio measured in X grains can help to understand the origin of solar system boron and constrain still unknown neutrino mass hierarchy if the observational and theoretical uncertainties associated with these abundances are reduced.We emphasize that the further precise experiment of measuring the^(11)C(α,p)^(14)N reaction cross sections at the astrophysically interesting energies of Gamow window 0.23-1.24 MeV,which corresponds to the effective temperature T=0.2-1 GK,could clarify CCSN contribution to the solar^(11)B/^(10)B ratio.
