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Phys. Rev. C 68, 035801 (2003) [7 pages]

Neutron capture cross section of 139La

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S. O’Brien*, S. Dababneh†, M. Heil, F. Käppeler‡, and R. Plag
Forschungszentrum Karlsruhe, Institut für Kernphysik, 76021 Karlsruhe, Germany

R. Reifarth
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

R. Gallino and M. Pignatari
Dipartimento di Fisica Generale, Università di Torino and Sezione INFN di Torino, Via P. Giuria 1, I-10125 Torino, Italy

Received 13 June 2003; published 18 September 2003

The neutron capture cross section of 139La has been measured relative to that of 197Au by means of the activation method. The sample was irradiated in a quasistellar neutron spectrum for kT=25keV generated via the 7Li(p,n)7Be reaction with the proton energy adjusted 30 keV above the threshold. Maxwellian averaged neutron capture cross sections were calculated for energies kT=5–100keV. The new value for kT=30keV is found to be 31.6±0.8mb, 18% lower and considerably less uncertain than the previously recommended value of 38.4±2.7mb. With these results the s- and r-process components could be more accurately determined, making lanthanum a reliable s- and r-process indicator in stellar spectroscopy.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.68.035801
DOI:
10.1103/PhysRevC.68.035801
PACS:
25.40.Lw, 26.20.+f, 27.60.+j, 97.10.Tk

*Permanent address: Department of Physics, University of Notre Dame, Notre Dame, IN 46556.

†On leave from Faculty of Applied Sciences, Al-Balqa Applied University, Salt 19117, Jordan.

‡Corresponding author. Email address: franz.kaeppeler@ik.fzk.de

 
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