Photoneutron cross section measurements on the N=82 nuclei La139 and Pr141: Implications for p-process nucleosynthesis

H. Utsunomiya, A. Makinaga, S. Goko, T. Kaihori, H. Akimune, T. Yamagata, M. Ohta, H. Toyokawa, S. Müller, Y.-W. Lui, and S. Goriely
Phys. Rev. C 74, 025806 – Published 22 August 2006

Abstract

Cross sections of the La139(γ,n) and Pr141(γ,n) reactions were measured using quasi-monochromatic γ-ray beams from laser Compton scattering. The results are compared to the predictions of Hauser-Feshbach statistical calculations using different models for the γ-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 La138 by the p process. No evidence for a large thermonuclear p-process contribution to the solar La138 is found. The need to further explore the photodestruction rate of La138 is emphasized.

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  • Received 23 September 2005

DOI:https://doi.org/10.1103/PhysRevC.74.025806

©2006 American Physical Society

Authors & Affiliations

H. Utsunomiya1, A. Makinaga1, S. Goko1, T. Kaihori1, H. Akimune1, T. Yamagata1, M. Ohta1, H. Toyokawa2, S. Müller3, Y.-W. Lui4, and S. Goriely5

  • 1Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501, Japan
  • 2National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
  • 3Institut fuer Kernphysik, TU Darmstadt, Schlossgartenstr 9, D-64289 Darmstadt, Germany
  • 4Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
  • 5Institute d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, Campus de la Plaine, CP-226, 1050 Brussels, Belgium

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Vol. 74, Iss. 2 — August 2006

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