Variational Monte Carlo method for shell-model calculations in odd-mass nuclei and restoration of symmetry

Abstract

We investigate two kinds of extensions for the variational Monte Carlo (VMC) method with the Pfaffian in the nuclear shell-model calculations. One is the extension to odd-mass nuclei, for which we find a new Pfaffian expression of the VMC matrix elements. We can, thereby, give a unified VMC framework both for even and odd mass nuclei. The other is the extension of the variation after angular-momentum projection. We successfully implement the full angular-momentum projected trial state into the VMC method, which can provide us with the precise yrast energies. We also find a unique characteristic, namely that this angular-momentum projection in the VMC can be even "approximately" performed. This characteristic is useful not only for efficient computation but also for precise estimation of the yrast energies through the energy-variance extrapolation.

10 pages, 4 figures, submitted to Phys. Rev. C

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Cited by in corpus (4)

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• $SO(3)$ quadratures in angular-momentum projection
• Monopole and Seniority Truncations in the Large-Scale Configuration Interaction Shell Model Approach
• Symmetry projection to coupled-cluster singles and doubles wave function through the Monte Carlo method