Practical solution to the Monte Carlo sign problem: Realistic calculations of Fe-54
Oct 22, 1993
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Abstract:
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 Fe-54 in the full fp-shell basis using the Brown-Richter interaction. We find the Gamow-Teller beta+ strength to be quenched by 63% relative to the single-particle estimate, in better agreement with experiment than previous estimates based on truncated bases.References(13)
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