Nuclear neutrino energy spectra in high temperature astrophysical environments

作者：Misch, G. Wendell^*; Fuller, George M.

来源：PHYSICAL REVIEW C, 2016, 94(5): 055808.

DOI：10.1103/PhysRevC.94.055808

• WEAK-INTERACTION RATES
• INTERMEDIATE-MASS NUCLEI
• SD-SHELL NUCLEI
• RATE TABLES
• GRAVITATIONAL COLLAPSE
• SUPERNOVA SHOCK
• SIMULATIONS
• EXPLOSION
• CURRENTS
• PHYSICS

Astrophysical environments that reach temperatures greater than similar to 100 keV can have significant neutrino energy loss via both plasma processes and nuclear weak interactions. We find that nuclear processes likely produce the highest-energy neutrinos. The important weak nuclear interactions include both charged current channels (electron capture and emission and positron capture and emission) and neutral current channels (deexcitation of nuclei via neutrino pair emission). We show that, in order to make a realistic prediction of the nuclear neutrino spectrum, one must take nuclear structure into account; in some cases, the most important transitions may involve excited states, possibly in both parent and daughter nuclei. We find that the standard technique of producing a neutrino energy spectrum by using a single transition with a Q value and matrix element chosen to fit published neutrino production rates and energy losses will not accurately capture important spectral features.

• 出版日期2016-11-30
• 单位上海交通大学