Photoneutron cross section measurements on the N=82 nuclei {sup 139}La and {sup 141}Pr: Implications for p-process nucleosynthesis
- Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501 (Japan)
- National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 (Japan)
- Institut fuer Kernphysik, TU Darmstadt, Schlossgartenstr 9, D-64289 Darmstadt (Germany)
- Cyclotron Institute, Texas A and M University, College Station, Texas 77843 (United States)
- Institute d'Astronomie et d'Astrophysique, Universite Libre de Bruxelles, Campus de la Plaine, CP-226, 1050 Brussels (Belgium)
Cross sections of the {sup 139}La({gamma},n) and {sup 141}Pr({gamma},n) reactions were measured using quasi-monochromatic {gamma}-ray beams from laser Compton scattering. The results are compared to the predictions of Hauser-Feshbach statistical calculations using different models for the {gamma}-ray strength function. The model parameters are constrained by the present experimental data and used to estimate the stellar photoneutron rates and their associated uncertainties and to study the implication for the production of the rare odd-odd nuclide {sup 138}La by the p process. No evidence for a large thermonuclear p-process contribution to the solar {sup 138}La is found. The need to further explore the photodestruction rate of {sup 138}La is emphasized.
- OSTI ID:
- 20863754
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 74, Issue 2; Other Information: DOI: 10.1103/PhysRevC.74.025806; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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