Neutrino-nucleus reactions on oxygen and neon for nucleosynthesis and supernova neutrino detection

Toshio Suzuki,Ken’Ichiro Nakazato,Koh Takahashi,Satoshi Chiba,Takashi Yoshida,Hideyuki Umeda,Makoto Sakuda

doi:10.1088/1742-6596/1643/1/012027

Abstract

Spin-dipole strength in 16O and ν-induced reactions on 16O are studied by shell-model calculations. Charged- and neutral-current reaction cross sections for various particle and γ emission channels as well as the total ones are evaluated with the Hauser-Feshbach statistical method. Nucleosynthesis of 11B and 11C in supernovae through αp emission channels is investigated. Charged-current reaction cross sections induced by supernova ν and their dependence on ν oscillations are discussed for future supernova burst. Neutrino-nucleus reaction cross sections on 20Ne induced by Gamow-Teller and spin-dipole transitions are also investigated. Electron-capture rates for the forbidden transition 20Ne (e-, νe) 20F (2g.s. +) at stellar environments are discussed.

Highlights

Roles of Gamow-Teller (GT) transitions in nuclear rates, electron-capture and β-decay rates at stellar environments, have been investigated in various astrophysical processes [1,2,3,4,5]
Charged- and neutral-current reaction cross sections for various particle and γ emission channels as well as the total ones are evaluated with the Hauser-Feshbach statistical method
Charged-current reaction cross sections induced by supernova ν and their dependence on ν oscillations are discussed for future supernova burst

Summary

Introduction

Roles of Gamow-Teller (GT) transitions in nuclear rates, electron-capture and β-decay rates at stellar environments, have been investigated in various astrophysical processes [1,2,3,4,5]. Neutrino-nucleus reaction cross sections for 12C [6,7], 13C [8], 40Ar [9], 56Fe and 56Ni [10] have been updated, and applied to study ν-process nucleosynthesis [6,7,11] and ν properties [7,11]. Spin-dipole strengths in 16O and ν-induced reactions on 16O are studied in Sect. 2. Partial cross sections in various channels including multi-particle emissions are evaluated by the Hauser-Feshbach method, and implications on nucleosynthesis of light elements in supernovae are discussed. 3, ν-induced reactions on 20Ne, in which both the GT and spin-dipole contributions are important, are studied. Electron-capture rates for a second-forbidden transition in 20Ne are evaluated with the multipole expansion method.

Published under licence by IOP Publishing Ltd

20Ne total