Practical solution to the Monte Carlo sign problem: Realistic calculations of 54Fe

Details Practical solution to the Monte Carlo sign problem: Realistic calculations of 54Fe Practical solution to the Monte Carlo sign problem: Realistic calculations of 54Fe

1993-10-19

arxiv.org/abs/nucl-th/9310026v2

Phys.Rev.Lett.72:613-616,1994

Physics

Nuclear Physics

Nuclear Theory

11 pages + 2 figures (not included)

Scientific paper

10.1103/PhysRevLett.72.613

We present a practical solution to the "sign problem" in the auxiliary field Monte Carlo approach to the nuclear shell model. The method is based on extrapolation from a continuous family of problem-free Hamiltonians. To demonstrate the resultant ability to treat large shell-model problems, we present results for 54Fe in the full fp-shell basis using the Brown-Richter interaction. We find the Gamow-Teller beta^+ strength to be quenched by 58% relative to the single-particle estimate, in better agreement with experiment than previous estimates based on truncated bases.

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