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Phys. Rev. Lett. 98, 082501 (2007) [4 pages]

Gamow-Teller Strength in the Exotic Odd-Odd Nuclei 138La and 180Ta and Its Relevance for Neutrino Nucleosynthesis

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A. Byelikov1, T. Adachi2, H. Fujita3,4, K. Fujita5, Y. Fujita2, K. Hatanaka5, A. Heger6,7, Y. Kalmykov1, K. Kawase5, K. Langanke1,8, G. Martínez-Pinedo8, K. Nakanishi5, P. von Neumann-Cosel1,*, R. Neveling4, A. Richter1, N. Sakamoto5, Y. Sakemi5, A. Shevchenko1, Y. Shimbara2,†, Y. Shimizu5, F. D. Smit4, Y. Tameshige5, A. Tamii5, S. E. Woosley7, and M. Yosoi5
1Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
2Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
3School of Physics, University of the Witwatersrand, PO Wits, Johannesburg 2050, South Africa
4iThemba LABS, PO Box 722, Somerset West 7129, South Africa
5Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
6Theoretical Astrophysics Group, MS B227, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
7Department of Astronomy and Astrophysics, University of California, Santa Cruz, California 95064, USA
8Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany

Received 28 October 2006; published 23 February 2007

The Gamow-Teller strength distributions below the particle threshold in 138La and 180Ta, deduced from high-resolution measurements of the (3He,t) reaction at 0°, allow us to evaluate the role of charged-current reactions for the production of these extremely rare nuclides in neutrino-nucleosynthesis models. The analysis suggests that essentially all 138La in the Universe can be made that way. Neutrino nucleosynthesis also contributes significantly to the abundance of 180Ta but the magnitude depends on the unknown branching ratio for population of the long-lived isomer.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.082501
DOI:
10.1103/PhysRevLett.98.082501
PACS:
25.55.Kr, 26.30.+k, 27.60.+j, 27.70.+q

*Email address: vnc@ikp.tu-darmstadt.de

†Present address: NSCL, Michigan State University, East Lansing, MI 48824, USA.

 
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