# The four-particle harmonic-oscillator brackets: Compact expressions and updated Fortran program

## Description

Abstract We present a new version of the four-particle harmonic-oscillator transformation brackets (4HOB) calculation program, where marginal cases of mass-ratio parameters d=0, d→∞ and d_1 =0, which cannot be calculated in previous version, are presented. The simplified 4HOB calculation formulas for these cases are given. Title of program: HOTB Catalogue Id: AEFQ_v2_0 Nature of problem Calculation of the four-particle harmonic-oscillator transformation brackets for cases of mass-ratio parameters d = 0, d → ∞ and d 1 = 0. Versions of this program held in the CPC repository in Mendeley Data AEFQ_v1_0; HOTB; 10.1016/j.cpc.2009.10.012 AEFQ_v2_0; HOTB; 10.1016/j.cpc.2011.01.031 AEFQ_v3_0; HOTB_M; 10.1016/j.cpc.2012.09.021 AEFQ_v4_0; HOTB_MPI; 10.1016/j.cpc.2014.06.025 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)