Estimation of 2p2h effect on Gamow-Teller transition with Second Tamm-Dancoff-Approximation

Abstract

Two-particle two-hole (2p2h) effect on the Gamow-Teller (GT) transition for neutron-rich nuclei is studied by the second Tamm-Dancoff approximation (STDA) with the Skyrme interaction. Unstable ${}^{24}$O and ${}^{34}$Si, and stable ${}^{48}$Ca nuclei are chosen to study the quenching and fragmentation of the GT strengths. Correlation of the 2p2h configurations causes $20$\% quenching and downward shift of GT giant resonances (GTGRs). The residual interaction changing relative angular momentum, appeared in the tensor force part, gives a meaningful effect to the GT strength distributions. In this work, $17$ to $26$ \% of the total GT strengths are brought to high energy region above GTGRs. In particular, the tensor force brings strengths to high energy more than $50$ MeV. STDA calculation within a small model space for 2p2h configuration is also performed and experimental data of ${}^{48}$Ca is reproduced reasonably.

11 pages, 13 figures and 4 tables

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Cited by in corpus (9)

• Nuclear Equation of State from ground and collective excited state properties of nuclei
• Quenching of Gamow-Teller strengths and two particle -- two hole configurations
• Examinations of the consistency of the quasiparticle random-phase approximation approach to double-$\beta$ decay of ${}^{48}$Ca
• Nuclear Many-Body Effect on Particle Emissions Following Muon Capture on ${}^{28}$Si and ${}^{40}$Ca
• Estimation of nuclear matrix elements of double-$\beta$ decay from shell model and quasiparticle random-phase approximation
• Theoretical investigation of two-particle two-hole effect on spin-isospin excitations through charge-exchange reactions
• Lifetime measurement of the muonic atoms of enriched Si isotopes
• Recent applications of the subtracted second RPA method
• Bulk and spectroscopic nuclear properties within an ab initio renormalized random-phase approximation framework