Mayer, J., Goriely, S., Netterdon, L., Peru, S., Scholz, P., Schwengner, R. and Zilges, A. (2016). Partial cross sections of the Mo-92(p,gamma) reaction and the gamma strength in Tc-93. Phys. Rev. C, 93 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993
Full text not available from this repository.Abstract
Background: Mo-92 is the most abundant nucleus of the p nuclei, with an isotopic abundance of more than 14 %. The gamma-process nucleosynthesis is believed to produce Mo-92 but fails to explain its large abundance, especially with respect to the other p nuclei produced in the same stellar environment. Further studies require precise nuclear models for the calculation of reaction cross sections. Purpose: A measurement of the total and partial cross sections of the Mo-92(p,gamma) Tc-93 reaction allows for a stringent test of statistical-model predictions. Not only different proton + nucleus optical model potentials, but also the gamma-ray strength function of Tc-93 can be investigated. In addition, high-resolution in-beam gamma-ray spectroscopy enables the determination of new precise nuclear structure data for Tc-93. Method: Total and partial cross-section values were measured by using the in-beam method. Prompt. rays emitted during the irradiation of Mo-92 with protons at seven different energies between 3.7 and 5.3 MeV were detected by using the high-purity germanium (HPGe) detector array HORUS at the Institute for Nuclear Physics, University of Cologne. The gamma gamma-coincidence method was applied to correlate gamma-ray cascades in 93Tc with their origin in the Mo-92 + p compound state. Results: The measured cross sections are compared to Hauser-Feshbach calculations by using the statistical-model code TALYS on the basis of different nuclear physics input models. Using default settings based on standard phenomenological models, the experimental values cannot be reproduced. A shell-model calculation was carried out to predict the low-energy M1 strength in Tc-93. Together with Gogny-Hartree-Fock-Bogoliubov (Gogny-HFB) or Skyrme-HFB plus quasi-particle random-phase approximation (QRPA) models for the gamma-ray strength function, the agreement between experimental data and theoretical predictions could be significantly improved. In addition, deviations from the adopted level scheme were found. Conclusions: By using Gogny-or Skyrme-HFB + QRPA E1 and shell-model M1 strength functions, statisticalmodel predictions can be significantly improved. Partial cross sections provide a valuable testing ground for gamma-ray strength functions for nuclear astrophysics applications. In addition, they can be used to investigate nuclear-structure properties of the compound nucleus.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||
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URN: | urn:nbn:de:hbz:38-278411 | ||||||||||||||||||||||||||||||||
DOI: | 10.1103/PhysRevC.93.045809 | ||||||||||||||||||||||||||||||||
Journal or Publication Title: | Phys. Rev. C | ||||||||||||||||||||||||||||||||
Volume: | 93 | ||||||||||||||||||||||||||||||||
Number: | 4 | ||||||||||||||||||||||||||||||||
Date: | 2016 | ||||||||||||||||||||||||||||||||
Publisher: | AMER PHYSICAL SOC | ||||||||||||||||||||||||||||||||
Place of Publication: | COLLEGE PK | ||||||||||||||||||||||||||||||||
ISSN: | 2469-9993 | ||||||||||||||||||||||||||||||||
Language: | English | ||||||||||||||||||||||||||||||||
Faculty: | Unspecified | ||||||||||||||||||||||||||||||||
Divisions: | Unspecified | ||||||||||||||||||||||||||||||||
Subjects: | no entry | ||||||||||||||||||||||||||||||||
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Refereed: | Yes | ||||||||||||||||||||||||||||||||
URI: | http://kups.ub.uni-koeln.de/id/eprint/27841 |
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