Bartl A, Pethick C J, Schwenk A
Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany.
The Niels Bohr International Academy, The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark and NORDITA, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-106 91 Stockholm, Sweden.
Phys Rev Lett. 2014 Aug 22;113(8):081101. doi: 10.1103/PhysRevLett.113.081101.
At low energies nucleon-nucleon interactions are resonant and therefore supernova matter at subnuclear densities has many similarities to atomic gases with interactions dominated by a Feshbach resonance. We calculate the rates of neutrino processes involving nucleon-nucleon collisions and show that these are enhanced in mixtures of neutrons and protons at subnuclear densities due to the large scattering lengths. As a result, the rate for neutrino pair bremsstrahlung and absorption is significantly larger below 10(13) g cm(-3) compared to rates used in supernova simulations.
在低能量下，核子 - 核子相互作用是共振的，因此亚核密度下的超新星物质与原子气体有许多相似之处，其相互作用由费什巴赫共振主导。我们计算了涉及核子 - 核子碰撞的中微子过程速率，并表明由于大散射长度，在亚核密度的中子和质子混合物中这些速率会增强。结果，与超新星模拟中使用的速率相比，在低于10¹³克/厘米³时中微子对轫致辐射和吸收的速率显著更大。
