Physics – Nuclear Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvc..70c5801c&link_type=abstract
Physical Review C, vol. 70, Issue 3, id. 035801
Physics
Nuclear Physics
9
Nuclear Matter, Nuclear Physics Aspects Of Novae, Supernovae, And Other Explosive Environments, Neutrino Scattering, Neutrino Interactions
Scientific paper
The neutrino mean free paths (NMFP) for scattering and absorption in cold symmetric nuclear matter (SNM) are calculated using two-body effective interactions and one-body effective weak operators obtained from realistic models of nuclear forces using correlated basis theory. The infinite system is modeled in a box with periodic boundary conditions and the one particle-hole ( p-h ) response functions are calculated using the Tamm-Dancoff approximation (TDA). For the densities ρ= 1 /2 , 1, 3 /2 ρ0 , where ρ0 is the equilibrium density of SNM, the strength of the response is shifted to higher energy transfers when compared to a noninteracting Fermi gas (FG). This and the weakness of effective operators compared to the bare operators, significantly reduces the cross sections, enhancing the NMFP by factors of ˜2.5 3.5 at the densities considered. The NMFP at the equilibrium density ρ0 are also calculated using the TDA and random phase approximation (RPA) using zero range Skyrme-like effective interactions with parameters chosen to reproduce the equation of state and spin-isospin susceptibilities of matter. Their results indicate that RPA corrections to correlated TDA may further increase the NMFP by ˜25% to 3 4 times those in a noninteracting FG. Finally, the sums and the energy weighted sums of the Fermi and Gamow-Teller responses obtained from the correlated ground state are compared with those of the 1 p-h response functions to extract the sum and mean energies of multi p-h contributions to the weak response. The relatively large mean energy of the multi p-h excitations suggests that they may not contribute significantly to low energy NMFP.
Cowell S.
Pandharipande Vijay R.
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