Universität zu Köln

Heim, F., Mayer, J., Mueller, M., Scholz, P. and Zilges, A. (2021). Investigating the Ag-109(p, gamma) Cd-110 reaction and its underlying nuclear physics. Phys. Rev. C, 103 (5). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9993

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Abstract

Background: The nucleosynthesis of neutron-deficient p nuclei remains an unsolved puzzle in nuclear astrophysics. Most likely, huge networks containing hundreds of nuclear reactions are responsible for the creation of this group of nuclei. In reality, many of the relevant reaction rates cannot be studied experimentally but need to be estimated using global and robust theoretical approaches. The underlying nuclear physics that enters these calculations is often still not constrained well enough, especially for nuclei further off the valley of stability. Purpose: Here, we complete the systematic measurement of radiative proton-capture reactions on stable Ag isotopes. The results will be used to test existing theoretical models and are crucial to constrain underlying nuclear physics properties. For this purpose, total cross sections of the Ag-109(p,gamma) Cd-110 reaction have been measured at proton energies between 2.5 and 5.0 MeV. Method: The cross-section measurements have been carried out by means of in-beam gamma-ray spectroscopy and the observation of all ground-state transitions in Cd-110. In general, the total cross sections depend strongly on the gamma-ray strength function (gamma-SF) and the nuclear level density (NLD). While the former one is taken from the systematics in other even-even Cd isotopes, the NLD has been constrained by renormalizing microscopic, tabulated values onto the low-lying cumulative number of levels. Results: For the first time, Ag-109 (p, gamma) Cd-110 reaction cross sections have been reported over a wide range of beam energies. The total cross-section results are in good agreement with a rather limited, formerly published dataset. A convincing agreement with recent Hauser-Feshbach calculations is received when using existing descriptions for the gamma-SF and a renormalized, microscopic NLD model. Conclusion: The measured cross sections confirmed the reliability of existing theoretical models used in Hauser-Feshbach statistical model calculations. Coherent results are obtained for the statistical nuclear physics properties in the even-even Cd isotopes as well as for the derived experimental cross sections.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Heim, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mayer, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scholz, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zilges, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-573931
DOI:	10.1103/PhysRevC.103.055803
Journal or Publication Title:	Phys. Rev. C
Volume:	103
Number:	5
Date:	2021
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9993
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LEVEL DENSITY; DATA SHEETS; P-PROCESS; S-PROCESS; 2-DIMENSIONAL MODELS; STRENGTH FUNCTION; REACTION-RATES; OPTICAL-MODEL; LESS-THAN; CONSTRAINTS Multiple languages Physics, Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/57393