1989
DOI: 10.1007/bf01294384
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Abstract: A microscopic model taking into account 2p2h configurations in magic nuclei is described in the framework of the consistent Green-function formalism. A simplified version of the model, which uses an approximation of the second order in the quasiparticle-phonon interaction in the propagator of the integral equation for the density matrix, is developed. This version is applied to calculations of M 1 excitation characteristics in 160, 4~ 54Fe, 9~ and 2~

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Cited by 17 publications
(38 citation statements)
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“…[91,92] and realized in refs. [93,94,95] for the M1 resonances in magic nuclei 16 O, 40,48 Ca and 208 Pb in the λ representation. A reasonably good description of the experimental data, including solution of the long-standing problem of the isovector M1 resonance in 208 Pb was obtained.…”
Section: )mentioning
confidence: 99%
“…[91,92] and realized in refs. [93,94,95] for the M1 resonances in magic nuclei 16 O, 40,48 Ca and 208 Pb in the λ representation. A reasonably good description of the experimental data, including solution of the long-standing problem of the isovector M1 resonance in 208 Pb was obtained.…”
Section: )mentioning
confidence: 99%
“…[3][4][5][6][7]). It has been shown that the GSC caused by complex configurations play an important role in the theoretical description of the experimental data.…”
Section: Introductionmentioning
confidence: 99%
“…In some cases, the GSC2 can strongly affect the transition strengths and can even lead to the appearance of new transitions that are absent in calculations that include complex configurations in the excited states only, i.e., in calculations neglecting this type of GSC and using a restricted basis (see Refs. [3,5]). …”
Section: Introductionmentioning
confidence: 99%
“…An altogether different approach based on the TFFS extends the RPA by coupling 1p1h states to the most collectivized phonons (2p2h), and the continuum [16]. These calculations are also dependent on effective spin g-factors.…”
Section: Fig 5 (Color Online) (A) the Efficiency For Detecting Neutmentioning
confidence: 99%
“…These peaks, which are artificially smoothed for presentation in standard RPA, broaden naturally in extended random-phase approximation (ERPA) calculations due to the inclusion of coupling to 2p2h intra-and intershell configurations: the more coupling, the smoother the response. Green's function methods extending the theory of finite Fermi systems (TFFS) [18] also predict this smoothing when coupling of 1p1h states to more complex configurations is included [16]. Thus the presence and magnitude of the structures in the E1 strength distribution reflect the importance of such 2p2h configurations to the ground-state configuration.…”
Section: Introductionmentioning
confidence: 99%