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

Creators: Alhassid, Y.; Dean, D. J.; Koonin, S. E.; Lang, G.; Ormand, W. E.

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 the 54Fe in the full fp-shell basis using the Brown-Richter interaction. We find the Gamow-Teller β+ strength to be quenched by 58% relative to the single-particle estimate, in better agreement with experiment than previous estimates based on truncated bases.

Additional Information

©1994 The American Physical Society Received 20 October 1993 This work was supported in part by the NSF, Grants No. PHY90-13248 and No. PHY91-15574, by the DOE, Grant No. DE-FG02-91ER40608, and by a Caltech DuBridge postdoctoral fellowship to W.E.O. We thank P. Vogel and B. A. Brown for helpful discussions, and the Concurrent Supercomputing Consortium for a grant of DELTA time.

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