Dipole radiative strength functions from resonance neutron capture

McCullagh, C. M.; Stelts, M.L.; Chrien, R. E.

doi:10.1103/physrevc.23.1394

Cited by 102 publications

(82 citation statements)

References 49 publications

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“…The Lorentzian description is known to be less satisfactory at energies away from the GDR peak, and in particular fails to describe the low-energy experimental data, namely the radiation widths and gamma-ray spectra [14,16]. Various improvements have been brought to the Lorentzian form, mainly by including an energy-dependence of the GDR width capable of modifying the low-energy behavior of the E1-strength [8,[14][15][16].…”

Section: The E1-strength Functionmentioning

confidence: 99%

“…Various improvements have been brought to the Lorentzian form, mainly by including an energy-dependence of the GDR width capable of modifying the low-energy behavior of the E1-strength [8,[14][15][16]. For this reason, the photon transmission coefficient is most frequently described in the framework of the phenomenological Kopecky-Uhl generalized Lorentzian model [16].…”

Section: The E1-strength Functionmentioning

confidence: 99%

See 1 more Smart Citation

Photodisintegration of ultra-high-energy cosmic rays revisited

Khan¹,

Goriely²,

Allard³

et al. 2005

Astroparticle Physics

111

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Recent microscopic and phenomenological calculations of giant dipole resonances for A ≤ 56 nuclei are presented. The derived photodisintegration cross sections are exhaustively compared to the photonuclear data available to date. An accurate description of the data is found. Our new calculations are also compared with the previous and widely-used estimates of Puget, Stecker and Bredekamp. The present calculations also include all the possible paths down the nuclear chart. The impact on the photodisintegration of ultra-high-energy cosmic rays (UHECR) is illustrated for a Fe source with typical energies of 10 20−21 eV. At energies around 10 20 eV, the new cross sections are found to modify the UHECR photodisintegration rates. At energies around 10 21 eV, it is recommended to solve a full reaction network to estimate the photodisintegration rate of the UHECR.

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Section: The E1-strength Functionmentioning

confidence: 99%

Section: The E1-strength Functionmentioning

confidence: 99%

Photodisintegration of ultra-high-energy cosmic rays revisited

Khan¹,

Goriely²,

Allard³

et al. 2005

Astroparticle Physics

111

View full text Add to dashboard Cite

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“…Several refinements can be made, such as the energy dependence of the width and its temperature dependence [1][2][3][4] to describe all available experimental data. The Lorentzian GDR approach suffers, however, from shortcomings of various sorts.…”

Section: Introductionmentioning

confidence: 99%

Microscopic HFB + QRPA predictions of dipole strength for astrophysics applications

Goriely¹,

Khan²,

Samyn³

2004

Nuclear Physics A

292

340

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Large-scale QRPA calculations of the E1 strength are performed on top of HFB calculations in order to derive the radiative neutron capture cross sections for the whole nuclear chart. The spreading width of the GDR is taken into account by analogy with the second-RPA (SRPA) method. The accuracy of HFB+QRPA model based on various Skyrme forces with different pairing prescription and parameterization is analyzed. It is shown that the present model allows to constrain the effective nucleon-nucleon interaction with the GDR data and to provide quantitative predictions of dipole strengths.

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“…One can see that the present σ γn are significantly smaller than those of the previous measurements near the neutron threshold. Hauser-Feshbach model calculations were carried out based on different ingredients of model parameters: Lorentzian [8] and QRPA [9] models for the E1 γ strength function and back-shifted Fermi gas (BSFG) and combinatorial models [11,12] for the nuclear level density. Two calculations with the Lorentz -BSFG and the combinatorial -QRPA model parameters satisfactorily reproduce the present cross sections near the neutron threshold.…”

Section: Figurementioning

confidence: 99%

Photodisintegration of $^{80}$Se, $^{94}$Zr, and $^{108}$Pd as a probe of neutron capture for radioactive nuclei

Utsunomiya¹,

Makinaga²,

Goko³

et al. 2010

Proceedings of International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX — PoS(NIC-IX)

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Photoneutron cross sections were measured for 80 Se near the neutron separation energy with the laser Compton scattering γ rays. The stellar neutron capture rate for 79 Se was evaluated by using the photodisintegration data as constraints on the E1 γ strength function within the framework of the Hauser-Feshbach statistical model. The result is compared with the model calculation of Bao and Käppeler.

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Dipole radiative strength functions from resonance neutron capture

Cited by 102 publications

References 49 publications

Photodisintegration of ultra-high-energy cosmic rays revisited

Photodisintegration of ultra-high-energy cosmic rays revisited

Microscopic HFB + QRPA predictions of dipole strength for astrophysics applications

Photodisintegration of $^{80}$Se, $^{94}$Zr, and $^{108}$Pd as a probe of neutron capture for radioactive nuclei

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