Radiative transitions from neutron capture in53Cr resonances

Coceva, C.

doi:10.1007/bf02813075

Cited by 26 publications

(9 citation statements)

References 42 publications

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“…However, it has been shown [28,29,32,33,34] that the SLO model overestimates the photonuclear data away from the giant dipole resonance (GDR) centroid in many nuclei.…”

Section: Models For E1 and M1 Transitionsmentioning

confidence: 99%

“…where the Lorentzian parameters σ E1 , E E1 and Γ E1 are the peak cross section, energy and width of the giant dipole resonance, respectively, and are usually derived from photonuclear experiments. However, it has been shown [28,29,32,33,34] that the SLO model overestimates the photonuclear data away from the giant dipole resonance (GDR) centroid in many nuclei.…”

Section: Models For E1 and M1 Transitionsmentioning

confidence: 99%

See 1 more Smart Citation

Level density andγ-decay properties of closed shell Pb nuclei

Syed¹,

Guttormsen²,

Ingebretsen³

et al. 2009

Phys. Rev. C

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The level densities and γ-ray strength functions of 205−208 Pb have been measured with the Oslo method, utilizing the ( 3 He, 3 He ′ γ) and ( 3 He, αγ) reactions on the target nuclei 206 Pb and 208 Pb. The extracted level densities are consistent with known discrete levels at low excitation energies. The entropies and temperatures in the micro-canonical ensemble have been deduced from the experimental level density. An average entropy difference of ∆S ∼ 0.9k B has been observed between 205 Pb and 206 Pb. The γ-ray strength functions in 205−208 Pb have been extracted and compared with two models; however, none of them describe the data adequately. Intermediate structures have been observed in the γ-ray strength functions for γ-ray energies below neutron threshold in all the analyzed Pb nuclei. These structures become less pronounced while moving from the doubly-magic nucleus 208 Pb to 205 Pb.

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“…However, it has been shown [28,29,32,33,34] that the SLO model overestimates the photonuclear data away from the giant dipole resonance (GDR) centroid in many nuclei.…”

Section: Models For E1 and M1 Transitionsmentioning

confidence: 99%

Section: Models For E1 and M1 Transitionsmentioning

confidence: 99%

Level density andγ-decay properties of closed shell Pb nuclei

Syed¹,

Guttormsen²,

Ingebretsen³

et al. 2009

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…A global description of the γ-decay spectra by the Lorentzian approach can be obtained over the energy range 1 2 8 E γ ÷ < < MeV but in that case the parameters become inconsistent with those derived from the photo-absorption data near the GDR peak. Generally, the SLO with the GDR parameters overestimates experimental data around the neutron separation energy, such as capture cross sections and the average radiative widths in heavy nuclei [1,[20][21][22][23]]. The first model with a correct description of the 1 E strengths at energies E γ close to zero was developed by Kadmenskij, Markushev and Furman in Ref.…”

Section: Main Features Of the Tested Rsf Modelsmentioning

confidence: 99%

Verification of models for calculation of E1 radiative strength function

Plujko¹

2008

Proceedings of Workshop on Photon Strength Functions and Related Topics — PoS(PSF07)

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Photoabsorption cross sections and γ-decay strength function are calculated and compared with experimental data to test the existing models of dipole radiative strength functions (RSF) for the middle-weight and heavy atomic nuclei. Simplified version of the modified Lorentzian model are proposed. New tables of giant dipole resonance (GDR) parameters are given. It is shown that the phenomenological closed-form models with asymmetric shape can be used for overall estimates of the dipole RSF in the γ-ray energy region up to about 20 MeV when GDR parameters are known or the GDR systematics can be adopted. Otherwise, the HFB-QRPA microscopic model and the semi-classical approach with moving surface appear to be more adequate methods to estimate the dipole photoabsorption RSF. Workshop on Photon Strength Functions and Related Topics

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“…To date, most of our knowledge on the parity-nonconserving NN potentials in the nucleus has come from few-body systems, from parity-violating asymmetries in γ-decays in light nuclei ( 18 F, 19 F, and 21 Ne), from the scattering of polarized neutrons from heavy nuclei, and from measurements of nuclear anapole moments. All three of 18 F, 19 F, and 21 Ne exhibit low-lying parity doublets, and to extract information on the magnitude of the PNC coupling constants from these measurements very detailed shell model analyses have been carried out [1]. Haxton has exploited the similarity between the two-body operators for first forbidden beta-decay and parity violation, together with a measurement of the beta-decay of 18 Ne, to extract a value for the isovector weak PNC pion coupling constant, F π .…”

Section: Introductionmentioning

confidence: 99%

Parity violation in partial neutron capture reactions

Hayes

Zanini

2002

Phys. Rev. C

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In the last decade, the scattering of polarized neutrons on compound nucleus resonances proved to be a powerful experimental technique for probing nuclear parity violation. Longitudinal analyzing powers in neutron transmission measurements on p-wave resonances in nuclei such as 139 La and 232 Th were found to be as large as 10%. Here we examine the possibilities of carrying out a parallel program to measure asymmetries in the (n, γ) reaction on these same compound nuclear resonances. Symmetry-violating (n, γ) studies can also show asymmetries as large as 10%, and have the advantage over transmission experiments of allowing parity-odd asymmetries in several different gamma-decay branches from the same resonance. Thus, studies of parity violation in the (n, γ) reaction using high efficiency germanium detectors at the Los Alamos Lujan facility, for example, could determine the parity-odd nucleon-nucleon matrix elements in complex nuclei with high accuracy. Additionally, simultaneous studies of the E1 and V P N C matrix elements involved in these decays could be used to help constrain the statistical theory of parity non-conservation in compound nuclei.

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Radiative transitions from neutron capture in53Cr resonances

Cited by 26 publications

References 42 publications

Level density andγ-decay properties of closed shell Pb nuclei

Level density andγ-decay properties of closed shell Pb nuclei

Verification of models for calculation of E1 radiative strength function

Parity violation in partial neutron capture reactions

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