Elimination of spurious 0+ states in the quasiparticle time blocking approximation

Tselyaev, V.

doi:10.3103/s1062873810060286

Cited by 2 publications

(1 citation statement)

References 9 publications

(33 reference statements)

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“…The E1 photoabsorption cross section is related to the strength function S(ω) as follows: can be used to estimate the integral characteristics of the giant resonance [45,46]. The mean energy E 0 , the resonance width , and the maximum value of the cross section σ 0 are extracted from the calculated photoabsorption cross sections under the condition that the three lowest energy-weighted moments of the Lorentzian and of the theoretical curve should coincide in the energy interval considered.…”

Section: A Methodsmentioning

confidence: 99%

Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes

Авдеенков

Goriely²,

Kamerdzhiev

et al. 2011

Phys. Rev. C

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The E1 strength function for 15 stable and unstable Sn even-even isotopes from A = 100 to A = 176 are calculated using a self-consistent microscopic theory which, in addition to the standard (quasiparticle) randomphase approximation [(Q)RPA] approach, takes into account phonon coupling and the single-particle continuum (by means of the discretization procedure) with a cutoff of 100 MeV. Our analysis shows two distinct regions for which the integral characteristics of both the giant and pygmy resonances behave rather differently. For neutron-rich nuclei, starting from 132 Sn, we obtain a giant E1 resonance which significantly deviates from the widely used systematics extrapolated from experimental data in the β-stability valley. We show that the inclusion of phonon coupling is necessary for a proper description of the low-energy pygmy resonances and the corresponding transition densities for A < 132 nuclei, while in the A > 132 region the influence of phonon coupling is significantly smaller. The radiative neutron capture cross sections leading to the stable 124 Sn and unstable 132 Sn and 150 Sn nuclei are calculated with both the (Q)RPA and the beyond-(Q)RPA strength functions and shown to be sensitive to both the predicted low-lying strength and the phonon-coupling contribution. The comparison with the widely used phenomenological generalized Lorentzian approach shows considerable differences both for the strength function and the radiative neutron capture cross section. In particular, for the neutron-rich 150 Sn, the reaction cross section is found to be increased by a factor greater than 20. We conclude that the present approach may provide a complete and coherent description of the γ -ray-strength function for astrophysics applications. In particular, such calculations are highly recommended for a reliable estimate of the electromagnetic properties of exotic nuclei.

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Section: A Methodsmentioning

confidence: 99%

Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes

Авдеенков

Goriely²,

Kamerdzhiev

et al. 2011

Phys. Rev. C

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Calculations of the isoscalar giant monopole resonance within the self-consistent RPA and its extensions

Tselyaev¹,

Krewald²,

Литвинова³

et al. 2009

Preprint

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The strength distributions of the isoscalar giant monopole resonance have been calculated in 16 O, 40 Ca, 90 Zr, 112−124 Sn, 144 Sm, and 208 Pb nuclei within the self-consistent random phase approximation and its extensions which include pairing correlations and quasiparticle-phonon coupling. The results are compared with the available experimental data. The problem of the nuclear matter incompressibility is discussed.

show abstract

Elimination of spurious 0+ states in the quasiparticle time blocking approximation

Cited by 2 publications

References 9 publications

Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes

Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes

Calculations of the isoscalar giant monopole resonance within the self-consistent RPA and its extensions

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