# Seattle Snowmass Summer Meeting 2022

Jul 16 – 26, 2022
US/Pacific timezone

## Neutrino flavor equilibration and $\nu p$ process nucleosynthesis in core-collapse supernovae

Jul 18, 2022, 7:00 PM
2h 20m
211 South Ballroom (HUB)

### Speaker

Amol Patwardhan (SLAC)

### Description

An enduring mystery in nuclear astrophysics pertains to the relatively high observed abundances of the proton-rich isotopes $^{92,94}$Mo and $^{96,98}$Ru. An attractive proposal to solve this problem is called the $\nu p$ process. This process could operate in a core-collapse supernova (CCSN) hot bubble, which is formed by a neutrino-driven matter outflow from the surface of the proto-neutron star after the shock is launched. Under certain conditions, the outflow can be proton-rich, and electron antineutrino captures on protons can create a subdominant neutron population, triggering $(n,\gamma)$ and $(n,p)$ reactions, which combined with $(p,\gamma)$ provide a pathway to make certain proton-rich nuclides considerably beyond the iron peak.

The precise outcome of $\nu p$ process nucleosynthesis depends on the exact physical conditions in the outflow, such as entropy, expansion timescale, electron fraction, and neutrino emission characteristics (luminosities and spectra). Here, we examine the effects of neutrino flavor equilibration near a proto-neutron star on the yields of the $\nu p$ process. Such flavor equilibration may arise, for instance, as a result of fast neutrino flavor conversions near a supernova core.

In-person or Virtual? In-person

### Primary authors

Alexander Friedland (SLAC) Amol Patwardhan (SLAC) Payel Mukhopadhyay (Stanford University) Mr Shuo Xin (Stanford University)

### Presentation materials

 patwardhan_snowmass2022_poster95.mp4 patwardhan_snowmass2022_poster95.pdf