Impact of phonon coupling on the photon strength function

Achakovskiy, O. I.; Авдеенков, А. В.; Goriely, Stéphane; Kamerdzhiev, S. P.; Krewald, S.

doi:10.1103/physrevc.91.034620

Cited by 26 publications

(38 citation statements)

References 30 publications

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“…The microscopic calculations for isotopes 58,68,72 Ni, 116,118,122,132 Sn were used; they were taken from corresponding figures in Ref. [7,18] with energy step 0.01 MeV. The uncertainty σ exp, j for χ 2 i , Eq.…”

Section: Calculations and Discussionmentioning

confidence: 99%

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Improvements and testing practical expressions for photon strength functions of E1 gamma-transitions

Plujko¹,

Gorbachenko²,

Каденко³

et al. 2017

EPJ Web Conf.

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Abstract. Analytical expression for the E1 photon strength functions (PSF) is modified to account for the low-energy enhancement due to nuclear structure effects (presence of pygmy dipole resonance (PDR)). A closed-form expression of the E1 PSF function includes response of two nuclear states -PDR and giant dipole resonance (GDR). Expression for the nuclear response function on electromagnetic field is based on a model of excitation of two coupled damped states. This approach is tested for different data sets for spherical nuclei. Impact on the PSF shape of coupling between the PDR and GDR excitations is considered.

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Section: Calculations and Discussionmentioning

confidence: 99%

“…Different semiphenomenological approaches for the PSF of the E1 transitions were discussed in Refs. [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Improvements and testing practical expressions for photon strength functions of E1 gamma-transitions

Plujko¹,

Gorbachenko²,

Каденко³

et al. 2017

EPJ Web Conf.

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“…In our works [5][6][7] it was shown that, in order to describe the observed PSF structures, it is necessary to take the phonon coupling (PC) into account in addition to the structures caused by the QRPA effects. The calculations of PSF have been performed within the selfconsistent version of the extended theory of finite fermi systems in the quasiparticle time blocking approximation (ETFFS(QTBA)) [8,9].…”

Section: Introductionmentioning

confidence: 99%

Self-consistent calculations of radiative nuclear reaction characteristics for⁵⁶Ni,¹³²Sn,²⁰⁸Pb

Achakovskiy

Kamerdzhiev

2017

EPJ Web Conf.

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Abstract. The photon strength functions (PSF), neutron capture cross sections and average radiative widths of neutron resonances for three double-magic nuclei 56 Ni, 132 Sn and 208 Pb have been calculated within the self-consistent version of the microscopic theory. Our approach includes phonon coupling (PC) effects in addition to the standard QRPA approach. With our microscopic PSFs, calculations of radiative nuclear reaction characteristics have been performed using the EMPIRE 3.1 nuclear reaction code. Three nuclear level density (NLD) models have been used: the phenomenological so-called GSM, phenomenological Enhanced GSM (EGSM) and microscopical combinatorial HFB model. For all the considered characteristics, we found a noticeable contribution of the PC effects and a significant disagreement between the results obtained with the GSM and the other two NLD models. The results confirm the necessity of using consistent microscopic approaches for calculations of radiative nuclear characteristics in double-magic nuclei.

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“…As a new feature in these calculations, the single-particle continuum was included, thus avoiding the artificial discretization usually implied in RPA and TBA. In our previous calculations for semimagic nuclei, see, for example, [9,10,12], a discretization procedure for the single-particle continuum was used (which gave the same results within CRPA for doublemagic nuclei [9]). As the self-consistent TBA calculations of photoabsorption or PSF are rather time-consuming, we have used the corresponding results for 132 Sn from Ref.…”

Section: Introductionmentioning

confidence: 99%

Microscopic calculations of the characteristics of radiative nuclear reactions for double-magic nuclei

Achakovskiy

Kamerdzhiev

Tselyaev

et al. 2016

EPJ Web of Conferences

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Abstract. The neutron capture cross sections and average radiative widths Γ γ of neutron resonances for two double-magic nuclei 132 Sn and 208 Pb have been calculated using the microscopic photon strength functions (PSF), which were obtained within the microscopic self-consistent version of the extended theory of finite Fermi systems in the time blocking approximation. For the first time, the microscopic PSFs have been obtained within the fully self-consistent approach with exact accounting for the single particle continuum (for 208 Pb). The approach includes phonon coupling effects in addition to the standard RPA approach. The known Skyrme force has been used. The calculations of nuclear reaction characteristics have been performed with the EM-PIRE 3.1 nuclear reaction code. Here, three nuclear level density (NLD) models have been used: the so-called phenomenological GSM, the EMPIRE specific (or Enhanced GSM) and the microscopical combinatorial HFB NLD models. For both considered characteristics we found a significant disagreement between the results obtained with the GSM and HFB NLD models. For 208 Pb, a reasonable agreement has been found with systematics for the Γ γ values with HFB NLD and with the experimental data for the HFB NLD average resonance spacing D 0 , while for these two quantities the differences between the values obtained with GSM and HFB NLD are of several orders of magnitude. The discrepancies between the results with the phenomenological EGLO PSF and microscopic RPA or TBA are much less for the same NLD model.

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Impact of phonon coupling on the photon strength function

Cited by 26 publications

References 30 publications

Improvements and testing practical expressions for photon strength functions of E1 gamma-transitions

Improvements and testing practical expressions for photon strength functions of E1 gamma-transitions

Self-consistent calculations of radiative nuclear reaction characteristics for⁵⁶Ni,¹³²Sn,²⁰⁸Pb

Microscopic calculations of the characteristics of radiative nuclear reactions for double-magic nuclei

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Impact of phonon coupling on the photon strength function

Cited by 26 publications

References 30 publications

Improvements and testing practical expressions for photon strength functions of E1 gamma-transitions

Improvements and testing practical expressions for photon strength functions of E1 gamma-transitions

Self-consistent calculations of radiative nuclear reaction characteristics for56Ni,132Sn,208Pb

Microscopic calculations of the characteristics of radiative nuclear reactions for double-magic nuclei

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Product

Resources

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Self-consistent calculations of radiative nuclear reaction characteristics for⁵⁶Ni,¹³²Sn,²⁰⁸Pb