Universität zu Köln

Sauerwein, A., Becker, H. -W., Dombrowski, H., Elvers, M., Endres, J., Giesen, U., Hasper, J., Hennig, A., Netterdon, L., Rauscher, T., Rogalla, D., Zell, K. O. and Zilges, A. (2011). Determination of Pr-141(alpha, n)Pm-144 cross sections at energies of relevance for the astrophysical p process using the gamma gamma coincidence method. Phys. Rev. C, 84 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

The reaction Pr-141(alpha, n)Pm-144 was investigated between E-alpha = 11 MeV and 15 MeV with the activation method using the gamma gamma coincidence method with a segmented clover-type high-purity Germanium (HPGe) detector. Measurements with four other HPGe detectors were additionally made. The comparison proves that the gamma gamma coincidence method is an excellent tool to investigate cross sections down to the microbarn range. The (alpha, n) reaction at low energy is especially suited to test alpha + nucleus optical-model potentials for application in the astrophysical p process. The experimentally determined cross sections were compared to Hauser-Feshbach statistical model calculations using different optical potentials and generally an unsatisfactory reproduction of the data was found. A local potential was constructed to improve the description of the data. The consequences of applying the same potential to calculate astrophysical (gamma, alpha) rates for Pm-145 and Gd-148 were explored. In summary, the data and further results underline the problems in global predictions of alpha + nucleus optical potentials at astrophysically relevant energies.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Sauerwein, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, H. -W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dombrowski, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Elvers, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Endres, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Giesen, U. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hasper, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hennig, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Netterdon, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rauscher, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rogalla, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zell, K. O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zilges, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-487167
DOI:	10.1103/PhysRevC.84.045808
Journal or Publication Title:	Phys. Rev. C
Volume:	84
Number:	4
Date:	2011
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 REACTION-RATES; PROCESS NUCLEOSYNTHESIS; SM-146 PRODUCTION; NUCLEAR-PHYSICS; MASSIVE STARS; R-PROCESS; MODEL; SCATTERING; ELEMENTS; SYSTEM Multiple languages Physics, Nuclear Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48716