The low-energy M1<i>γ</i>-strength from radiative proton capture experiment

Voinov, A.; Grimes, S. M.; Brune, C. R.; Massey, T. N.

doi:10.1051/epjconf/20159301022

Cited by 3 publications

(4 citation statements)

References 12 publications

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“…Primary γ -ray intensities have been obtained for the 63,65 Cu(p, γ ) 64,66 Zn reactions in a way similar to the twostep cascade technique [9,[31][32][33][34][35]. This allows not only the measurement of many more primary γ rays at one excitation energy than using singles spectra only but also a more sensitive investigation of new branching transitions in the reaction product, as explained in the following section.…”

Section: The Dipole Strength From Primary γ-Ray Transition Intensities In Radiative Capture Reactionsmentioning

confidence: 99%

“…This method was originally developed to study γ -ray strength functions and nuclear level density models in radiative neutroncapture reactions [24]. Later it was adopted for (p, γ ) reactions, which reduced the impact of width fluctuations on the obtained γ -ray spectra because of the energy loss of the protons and, hence, a wider excitation window [34,35]. Statistical γ -decay codes have been developed to simulate the spectra of γ rays which are part of a two-step γ -ray cascade populating states in the reaction product [40,41].…”

Section: Discrete Two-step γ-Ray Cascadesmentioning

confidence: 99%

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Primary γ -ray intensities and γ -strength functions from discrete two-step γ -ray cascades in radiative proton-capture experiments

et al. 2020

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Background: Reaction rates of radiative capture reactions can play a crucial role in the nucleosynthesis of heavy nuclei in explosive stellar environments. These reaction rates depend strongly on γ -ray decay widths in the reaction products, which are, for nonresonant capture reactions at high excitation energies, derived from the γ -ray strength function and the nuclear level density. Recently, the ratio method was applied to primary γ rays observed from (d, p) reactions and nuclear resonance fluorescence measurements to extract the dipole strength in atomic nuclei and to test the generalized Brink-Axel hypothesis. Purpose: The purpose of this work is to apply the ratio method to primary γ -ray intensities of the 63,65 Cu(p,γ ) reactions to extract γ -ray strength information on the nuclei 64,66 Zn. The impact of spin distribution, total γ -ray decay widths, level densities, and width fluctuations on the application of the ratio method will be discussed. Additionally, by comparing the relative γ -ray strength at different excitation energies, conclusions on the validity of the generalized Brink-Axel hypothesis can be made. Method: The radiative proton capture reaction measurements have been performed at the HORUS γ -ray spectrometer of the University of Cologne at one excitation energy for each reaction. Primary γ -ray intensities have been determined by normalizing secondary γ -ray transitions in two-step cascades using their absolute branching ratio. The ratio method was applied to the measured primary γ -ray intensities as well as to previous measurements by Erlandsson et al. at different excitation energies. Results: The relative strength function curve for 64 Zn from our measurement shows no significant deviation from the previous measurement at a different excitation energy. The same is true for 66 Zn where both measurements were at almost the same excitation energy. Absolute γ -strength function values have been obtained by normalizing the relative curves to quasiparticle random phase approximation calculations because of the absence of experimental data in the respective energy region. Conclusion:The generalized Brink-Axel hypothesis, i.e., the independence of the strength function on the excitation energy, seems to hold in the studied energy region and nuclei. The method to obtain primary γ -ray intensities from two-step cascade spectra was shown to be a valuable and sensitive tool although its uncertainties are connected to the knowledge of the low-energy level scheme of the investigated nucleus. The scaling in the ratio method should be taken with care, because the relative strength is not a simple sum of f E 1 and f M1 but a somewhat complex linear combination dependent on the excitation energy of the nucleus.

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Section: The Dipole Strength From Primary γ-Ray Transition Intensities In Radiative Capture Reactionsmentioning

confidence: 99%

Section: Discrete Two-step γ-Ray Cascadesmentioning

confidence: 99%

Primary γ -ray intensities and γ -strength functions from discrete two-step γ -ray cascades in radiative proton-capture experiments

et al. 2020

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“…Originally developed for radiative neutron-capture reactions, this technique was applied recently to radiative proton-capture reactions as well [12] and served as additional confirmation for results obtained via the Oslo Method [13]. The advantage in the use of protons instead of neutrons is the smaller influence of Porter-Thomas fluctuations on the measured spectra [14]. The idea of this technique is the investigation of statistical γ-decay behavior via the detection of coincident γ-rays.…”

Section: Introductionmentioning

confidence: 99%

“…where Γ XL im (E) is the γ-decay width for a γ-transition of character and multipolarity XL and energy E and ρ(E, J) is the level density for a specific spin J and parity π at the intermediate energy E m [14]. Because the order of both γ-rays is indistinguishable, the term in Eq.…”

Section: Introductionmentioning

confidence: 99%

Study of nuclear physics input-parameters via high-resolution γ-ray spectroscopy

et al. 2017

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Abstract. For nucleosynthesis networks of isotopes heavier than those in the iron-peak region, reaction rates are often calculated within the Hauser-Feshbach statistical model. The accuracy of the predicted cross sections strongly depends on the uncertainties of the nuclear-physics input-parameters. These are nuclear-level densities, γ-ray strength functions, and particle+nucleus optical-model potentials. Here we report on the investigation of statistical properties of nuclei via radiative proton-capture reactions using highresolution γ-ray spectroscopy.

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Deducing primary γ -ray intensities and the dipole strength function in Mo94 via radiative proton capture

et al. 2021

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The low-energy M1γ-strength from radiative proton capture experiment

Cited by 3 publications

References 12 publications

Primary γ -ray intensities and γ -strength functions from discrete two-step γ -ray cascades in radiative proton-capture experiments

Primary γ -ray intensities and γ -strength functions from discrete two-step γ -ray cascades in radiative proton-capture experiments

Study of nuclear physics input-parameters via high-resolution γ-ray spectroscopy

Deducing primary γ -ray intensities and the dipole strength function in Mo94 via radiative proton capture

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