Netterdon, L., Endres, A., Kiss, G. G., Mayer, J., Rauscher, T., Scholz, P., Sonnabend, K., Toeroek, Zs. and Zilges, A. (2014). Cross-section measurement of the Ba-130(p,gamma)La-131 reaction for gamma-process nucleosynthesis. Phys. Rev. C, 90 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

Background: Deviations between experimental data of charged-particle-induced reactions and calculations within the statistical model are frequently found. An extended data base is needed to address the uncertainties regarding the nuclear-physics input parameters in order to understand the nucleosynthesis of the neutron-deficient p nuclei. Purpose: A measurement of total cross-section values of the Ba-130(p,gamma)La-131 reaction at low proton energies allows a stringent test of statistical model predictions with different proton+nucleus optical model potentials. Since no experimental data are available for proton-capture reactions in this mass region around A approximate to 130, this measurement can be an important input to test the global applicability of proton+nucleus optical model potentials. Method: The total reaction cross-section values were measured by means of the activation method. After the irradiation with protons, the reaction yield was determined by use of gamma-ray spectroscopy using two clover-type high-purity germanium detectors. In total, cross-section values for eight different proton energies could be determined in the energy range between 3.6 MeV <= E-p <= 5.0 MeV, thus, inside the astrophysically relevant energy region. Results: The measured cross-section values were compared to Hauser-Feshbach calculations using the statistical model codes TALYS and SMARAGD with different proton+nucleus optical model potentials. With the semimicroscopic JLM proton+nucleus optical model potential used in the SMARAGD code, the absolute cross-section values are reproduced well, but the energy dependence is too steep at the lowest energies. The best description is given by a TALYS calculation using the semimicroscopic Bauge proton+nucleus optical model potential using a constant renormalization factor. Conclusions: The statistical model calculation using the Bauge semimicroscopic proton+nucleus optical model potential deviates by a constant factor of 2.1 from the experimental data. Using this model, an experimentally supported stellar reaction rate for proton capture on the p nucleus Ba-130 was calculated. At astrophysical temperatures, an increase in the stellar reaction rate of 68% compared to rates obtained from the widely used NONSMOKER code is found. This measurement extends the scarce experimental data base for charged-particle-induced reactions, which can be helpful to derive a more globally applicable proton+nucleus optical model potential.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Netterdon, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Endres, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kiss, G. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mayer, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauscher, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scholz, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sonnabend, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Toeroek, Zs.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zilges, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-428468
DOI: 10.1103/PhysRevC.90.035806
Journal or Publication Title: Phys. Rev. C
Volume: 90
Number: 3
Date: 2014
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1089-490X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ASTROPHYSICAL REACTION-RATES; NUCLEAR-PHYSICS; IA SUPERNOVAE; R-PROCESS; MODEL; ENERGY; SYMMETRY; DECAYMultiple languages
Physics, NuclearMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/42846

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