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Estimation of a 2p2h effect on Gamow-Teller transitions within the second Tamm-Dancoff approximation

Minato, Futoshi   

Two-particle two-hole (2p2h) effect on 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 quenching and fragmentation of the GT strengths. The correlation of 2p2h configurations induces 20% quenching and downward shift of GT giant resonances (GTGRs). The residual interaction exchanging angular momentum by $$Delta L=2$$, appeared in the tensor force part as well as the central force part, gives a meaningful effect to the GT distributions. 15 to 20% 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 60 MeV. STDA calculation with a small model space for 2p2h configuration is also studied and experimental data of $$^{48}$$Ca is reproduced successfully.

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Category:Physics, Nuclear

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