Exploring the Neutrino Mass Hierarchy from Isotopic Ratios of Supernova Nucleosynthesis Products in Presolar Grains
Xingqun Yao🇨🇳 · Toshitaka Kajino🇨🇳 · Yudong Luo🇨🇳 · Takehito Hayakawa🇯🇵 · Toshio Suzuki🇯🇵 · Heamin Ko🇩🇪 · Myung-Ki Cheoun🇰🇷 · Seiya Hayakawa🇯🇵 · Hidetoshi Yamaguchi🇯🇵 · Silvio Cherubini🇮🇹
We study the nucleosynthesis in a core-collapse supernova model including newly calculated neutrino-induced reaction rates with both collective and Mikheyev-Smirnov-Wolfenstein (MSW) neutrino-flavor oscillations considered. We show that the measurement of a pair of B/B and La/La or Li/Li and La/La in presolar grains that are inferred to have originated from core-collapse supernovae could constrain the neutrino mass hierarchy. The new shell-model and the model of quasi-particle random phase approximation in the estimate of three important neutrino-induced reactions, O, Ne, and Ba are applied in our reaction network. The new rates decrease the calculated Li/Li ratio by a factor of five compared with the previous study. More interestingly, these new rates result in a clear separation of the isotopic ratio of B/B between normal and inverted mass hierarchies in the O/Ne, O/C, and C/He layers where La abundance depends strongly on the mass hierarchy. In these layers, the sensitivity of the calculated abundances of B and Li to the nuclear reaction uncertainties is also tiny. Therefore, we propose that the B/B vs. La/La and Li/Li vs. La/La in type X silicon carbide grains sampled material from C/He layer can be used as a new probe to constrain the neutrino mass hierarchy.