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Study of core-collapse supernovae.

by Simon Giraud

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When 2018-06-26
from 11:30 am à 12:30 pm
Where room 105
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For the core-collapse supernovae modeling it is essential to know as precise as possible the nuclear masses because the distribution of populated micro-states strongly depends on it. In addition, the values of nuclear masses enter directly in the calculations of the electron-capture rates, that, in turn, impact the neutrino flux which carries out 99% of the energy of the explosion.

Recent sensitivity studies show that the nuclei playing the most important role during the core-collapse phase are located around 78Ni and 128Pd. An experiment, which aimed to measure new nuclear masses and to improve those known around 78Ni using the JYFLTRAP Penning trap mass spectrometer at the IGISOL facility has been performed last November. The results obtained show that, among the considered theoretical models, the HFB24 mass model is the one which reproduces better the experimental data far from stability, compared to the widely used DZ10 model. Therefore, these new experimental data confirm the validity of the HFB24 mass model far from stability and allow to put more constrains on the neutron (N=40,50) and proton (Z=28) gap energies. Besides, new isomeric states have been also measured which could be a great interest for nuclear structure studies. Comparison with results from shell model calculations using recent interactions is ongoing.

 

We have also employed the same HFB model in our recent work, where we have implemented a new perturbative treatment of the extended Nuclear Statistical Equilibrium (NSE) model into the Lattimer and Swesty equation of state (LS EoS), widely used in core-collapse simulations. This study highlights the impact of the shell effects on the nuclear composition of the core during its collapse.

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