2008/04/30 by W. Horiuchi, Y. Suzuki
Physics and Astronomy · #Advanced Chemical Physics Studies #Atomic and Molecular Physics #Nuclear physics research studies #nucl-th
paper · pdf · doi:10.1103/physrevc.78.034305
published as Phys.Rev.C78:034305,2008 · 7 pages, 4 figures
arxiv created 2008/07/09 · openalex publication_date 2008/09/04 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Excited states of 4He are studied in four-body calculations with explicitly correlated Gaussian bases. All the levels below Ex=26 MeV are reproduced reasonably well using realistic potentials. An analysis is made to show how the 02+ 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 role of tensor force is stressed with a particular attention to the level spacing between the two 0^\ensuremath- states. The calculation of spectroscopic amplitudes, nucleon decay widths, and spin-dipole transition strengths demonstrates that the 02+ state and the three lowest-lying negative-parity states with 0^\ensuremath- and 2^\ensuremath- have 3H+p and 3He+n cluster configurations, leading to the interpretation that these negative-parity states are the inversion-doublet partners of the 02+ state.