Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Netterdon, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Endres, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kiss, G. G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mayer, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rauscher, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scholz, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sonnabend, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Toeroek, Zs. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zilges, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language ASTROPHYSICAL REACTION-RATES; NUCLEAR-PHYSICS; IA SUPERNOVAE; R-PROCESS; MODEL; ENERGY; SYMMETRY; DECAY Multiple languages Physics, Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42846