Monte Carlo calculations of the lowest energy level of a given angular momentum in the pairing model for even and odd Sn isotopes

摘要

We discuss how to evaluate with numerical Monte Carlo techniques the lowest energy levels of a given angular momentum for both even and odd numbers of particles in the pairing model (H) over cap = (H) over cap (0) - G (P) over cap (dagger)(P) over cap for some Sn isotopes. It is shown that a proper selection of the chemical potential strongly suppresses the sign fluctuations. [References: 11]