FOUR-BODY CALCULATION FOR EXCITED STATES OF 4HE

Abstract

Four-body calculations with explicitly correlated Gaussian bases are performed for excited states of 4 He . All the levels below E x =26 MeV are reproduced reasonably well using realistic potentials. An analysis is made to show how the [Formula: see text] state becomes a resonance but those having almost the same structure as this state in different spin-isospin channels are not observed as resonances. The calculation of spectroscopic amplitudes, nucleon decay widths, and spin-dipole transition strengths demonstrates that the [Formula: see text] state and the three lowest-lying negative-parity states with 0- and 2- have 3 H +p and 3 He +n cluster configurations, leading to the interpretation that these negative-parity states are the inversion-doublet partners of the [Formula: see text] state.