Conserving RPA and the response of 48Ca

M. G.E. Brand; K. Allaart; W. H. Dickhoff

doi:10.1016/0370-2693(88)90104-9

Conserving RPA and the response of ⁴⁸Ca

M. G.E. Brand
, K. Allaart
, W. H. Dickhoff

Department of Physics

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

The connection between the single-particle self-energy and the corresponding conserving particle-hole (ph) interaction, discussed long ago by Kadanoff and Baym, is employed to study the response of ⁴⁸Ca. Second order self-energy contributions are taken into account in the construction of the energy dependent ph interaction. From this perspective it is possible to make contact with other approaches which also aim to incorporate the coupling to 2p2h excitations within the RPA framework. The method is used to study both the discrete low-energy states as well as the giant resonances in both ⁴⁸Ca and ⁴⁸Sc using a realistic G matrix interaction based on meson exchange. The calculated strength distribution compares favorably with experiment but the strength below 15 MeV is still somewhat too large as compared to experiment for all types of excitations. The quenching of magnetic and Gamow-Teller strength due to 2p2h admixture amounts to about 30%.

Original language	English
Pages (from-to)	483-489
Number of pages	7
Journal	Physics Letters B
Volume	214
Issue number	4
DOIs	https://doi.org/10.1016/0370-2693(88)90104-9
State	Published - Dec 1 1988

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title = "Conserving RPA and the response of 48Ca",

abstract = "The connection between the single-particle self-energy and the corresponding conserving particle-hole (ph) interaction, discussed long ago by Kadanoff and Baym, is employed to study the response of 48Ca. Second order self-energy contributions are taken into account in the construction of the energy dependent ph interaction. From this perspective it is possible to make contact with other approaches which also aim to incorporate the coupling to 2p2h excitations within the RPA framework. The method is used to study both the discrete low-energy states as well as the giant resonances in both 48Ca and 48Sc using a realistic G matrix interaction based on meson exchange. The calculated strength distribution compares favorably with experiment but the strength below 15 MeV is still somewhat too large as compared to experiment for all types of excitations. The quenching of magnetic and Gamow-Teller strength due to 2p2h admixture amounts to about 30\%.",

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T1 - Conserving RPA and the response of 48Ca

AU - Brand, M. G.E.

AU - Allaart, K.

AU - Dickhoff, W. H.

PY - 1988/12/1

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N2 - The connection between the single-particle self-energy and the corresponding conserving particle-hole (ph) interaction, discussed long ago by Kadanoff and Baym, is employed to study the response of 48Ca. Second order self-energy contributions are taken into account in the construction of the energy dependent ph interaction. From this perspective it is possible to make contact with other approaches which also aim to incorporate the coupling to 2p2h excitations within the RPA framework. The method is used to study both the discrete low-energy states as well as the giant resonances in both 48Ca and 48Sc using a realistic G matrix interaction based on meson exchange. The calculated strength distribution compares favorably with experiment but the strength below 15 MeV is still somewhat too large as compared to experiment for all types of excitations. The quenching of magnetic and Gamow-Teller strength due to 2p2h admixture amounts to about 30%.

AB - The connection between the single-particle self-energy and the corresponding conserving particle-hole (ph) interaction, discussed long ago by Kadanoff and Baym, is employed to study the response of 48Ca. Second order self-energy contributions are taken into account in the construction of the energy dependent ph interaction. From this perspective it is possible to make contact with other approaches which also aim to incorporate the coupling to 2p2h excitations within the RPA framework. The method is used to study both the discrete low-energy states as well as the giant resonances in both 48Ca and 48Sc using a realistic G matrix interaction based on meson exchange. The calculated strength distribution compares favorably with experiment but the strength below 15 MeV is still somewhat too large as compared to experiment for all types of excitations. The quenching of magnetic and Gamow-Teller strength due to 2p2h admixture amounts to about 30%.

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DO - 10.1016/0370-2693(88)90104-9

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VL - 214

SP - 483

EP - 489

JO - Physics Letters B

JF - Physics Letters B

IS - 4

ER -

Conserving RPA and the response of ⁴⁸Ca

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