Galactic production of 138La: Impact of 138,139La statistical properties

B.V. Kheswa; M. Wiedeking; F. Giacoppo; S. Goriely; M. Guttormsen; A.C. Larsen; F.L. Bello Garrote; T.K. Eriksen; A. Görgen; T.W. Hagen; P.E. Koehler; M. Klintefjord; H.T. Nyhus; P. Papka; T. Renstrøm; S. Rose; E. Sahin; S. Siem; T. Tornyi

Physics Letters B (May 2015)

Galactic production of 138La: Impact of 138,139La statistical properties

B.V. Kheswa,
M. Wiedeking,
F. Giacoppo,
S. Goriely,
M. Guttormsen,
A.C. Larsen,
F.L. Bello Garrote,
T.K. Eriksen,
A. Görgen,
T.W. Hagen,
P.E. Koehler,
M. Klintefjord,
H.T. Nyhus,
P. Papka,
T. Renstrøm,
S. Rose,
E. Sahin,
S. Siem,
T. Tornyi

Affiliations

B.V. Kheswa: iThemba LABS, P.O. Box 722, 7129 Somerset West, South Africa; Physics Department, University of Stellenbosch, Private Bag X1, Matieland 7602, Stellenbosch, South Africa; Corresponding author at: iThemba LABS, P.O. Box 722, 7129 Somerset West, South Africa.
M. Wiedeking: iThemba LABS, P.O. Box 722, 7129 Somerset West, South Africa
F. Giacoppo: Department of Physics, University of Oslo, N-0316 Oslo, Norway
S. Goriely: Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, CP 226, B-1050 Brussels, Belgium
M. Guttormsen: Department of Physics, University of Oslo, N-0316 Oslo, Norway
A.C. Larsen: Department of Physics, University of Oslo, N-0316 Oslo, Norway
F.L. Bello Garrote: Department of Physics, University of Oslo, N-0316 Oslo, Norway
T.K. Eriksen: Department of Physics, University of Oslo, N-0316 Oslo, Norway
A. Görgen: Department of Physics, University of Oslo, N-0316 Oslo, Norway
T.W. Hagen: Department of Physics, University of Oslo, N-0316 Oslo, Norway
P.E. Koehler: Department of Physics, University of Oslo, N-0316 Oslo, Norway
M. Klintefjord: Department of Physics, University of Oslo, N-0316 Oslo, Norway
H.T. Nyhus: Department of Physics, University of Oslo, N-0316 Oslo, Norway
P. Papka: Physics Department, University of Stellenbosch, Private Bag X1, Matieland 7602, Stellenbosch, South Africa
T. Renstrøm: Department of Physics, University of Oslo, N-0316 Oslo, Norway
S. Rose: Department of Physics, University of Oslo, N-0316 Oslo, Norway
E. Sahin: Department of Physics, University of Oslo, N-0316 Oslo, Norway
S. Siem: Department of Physics, University of Oslo, N-0316 Oslo, Norway
T. Tornyi: Department of Physics, University of Oslo, N-0316 Oslo, Norway

Journal volume & issue: Vol. 744
pp. 268 – 272

Abstract

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The γ-ray strength functions and nuclear level densities of 138La and 139La have been measured below the neutron separation energies. These new data were used to calculate astrophysical Maxwellian-averaged (n,γ) cross-sections to investigate the production and destruction of the p-nucleus 138La in the photodisintegration process. The results confirm the underproduction of 138La in the p-process with respect to the observed abundances and strongly support the ν-process through νe capture on 138Ba as the main contributor to the synthesis of 138La in Type II supernovae. Keywords: γ-ray strength functions, Nuclear level densities, Maxwellian averaged cross-sections

Published in Physics Letters B

ISSN: 0370-2693 (Print); 1873-2445 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/physics-letters-b/

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