Rapid evaluation of four-body cluster contributions

Title of program: FOURBODY Catalogue Id: ABIA_v1_0 Nature of problem Within the framework of the cluster expansion formalism we present a method for rapidly evaluating the four-body contributions to the ground state energy of an extended system of bosons, specifically, alpha matter. Since the numerical results for alpha matter have been published elsewhere, we present here a fictitious example for which the exact results are obtainable. Versions of this program held in the CPC repository in Mendeley Data ABIA_v1_0; FOURBODY; 10.1016/0010-4655(71)90055-5 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)