Relativistic QRPA calculation of muon capture rates

Abstract

The relativistic proton-neutron quasiparticle random phase approximation (PN-RQRPA) is applied in the calculation of total muon capture rates on a large set of nuclei from ${}^{12}$C to ${}^{244}$Pu, for which experimental values are available. The microscopic theoretical framework is based on the Relativistic Hartree-Bogoliubov (RHB) model for the nuclear ground state, and transitions to excited states are calculated using the PN-RQRPA. The calculation is fully consistent, i.e., the same interactions are used both in the RHB equations that determine the quasiparticle basis, and in the matrix equations of the PN-RQRPA. The calculated capture rates are sensitive to the in-medium quenching of the axial-vector coupling constant. By reducing this constant from its free-nucleon value $g_A=1.262$ by 10% for all multipole transitions, the calculation reproduces the experimental muon capture rates to better than 10% accuracy.

19 pages, 5 figures, submitted to Phys. Rev. C

References in corpus (2)

• Calculation of beta-decay rates in a relativistic model with momentum-dependent self-energies
• Muon capture on nuclei: random phase approximation evaluation versus data for 6 $\le$ Z $\le$ 94 nuclei

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• Partial muon capture rates in $A=3$ and $A=6$ nuclei with chiral effective field theory
• Nuclear Many-Body Effect on Particle Emissions Following Muon Capture on ${}^{28}$Si and ${}^{40}$Ca
• Lifetime measurement of the muonic atoms of enriched Si isotopes
• Determination of the Muon Lifetime in ${}^{76}$Se with the MONUMENT experiment
• Muon capture rates within the projected QRPA