Gamow-Teller Strength in the Exotic Odd-Odd Nuclei $^{138}\mathrm{La}$ and $^{180}\mathrm{Ta}$ and Its Relevance for Neutrino Nucleosynthesis

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

A. Byelikov, T. Adachi, H. Fujita, K. Fujita, Y. Fujita, K. Hatanaka, A. Heger, Y. Kalmykov, K. Kawase, K. Langanke, G. Martínez-Pinedo, K. Nakanishi, P. von Neumann-Cosel, R. Neveling, A. Richter, N. Sakamoto, Y. Sakemi, A. Shevchenko, Y. Shimbara, Y. Shimizu, F. D. Smit, Y. Tameshige, A. Tamii, S. E. Woosley, and M. Yosoi

Phys. Rev. Lett. 98, 082501 – Published 23 February 2007

Abstract

The Gamow-Teller strength distributions below the particle threshold in ${}^{138}{La}$ and ${}^{180}{Ta}$ , deduced from high-resolution measurements of the ( ${}^{3}{He}, t$ ) 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 ${}^{138}{La}$ in the Universe can be made that way. Neutrino nucleosynthesis also contributes significantly to the abundance of ${}^{180}{Ta}$ but the magnitude depends on the unknown branching ratio for population of the long-lived isomer.

Received 28 October 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.082501

Authors & Affiliations

A. Byelikov¹, T. Adachi², H. Fujita^3,4, K. Fujita⁵, Y. Fujita², K. Hatanaka⁵, A. Heger^6,7, Y. Kalmykov¹, K. Kawase⁵, K. Langanke^1,8, G. Martínez-Pinedo⁸, K. Nakanishi⁵, P. von Neumann-Cosel^1,*, R. Neveling⁴, A. Richter¹, N. Sakamoto⁵, Y. Sakemi⁵, A. Shevchenko¹, Y. Shimbara^2,†, 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

^*Email address: vnc@ikp.tu-darmstadt.de
^†Present address: NSCL, Michigan State University, East Lansing, MI 48824, USA.

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Vol. 98, Iss. 8 — 23 February 2007

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Physical Review Letters

Gamow-Teller Strength in the Exotic Odd-Odd Nuclei La138 and Ta180 and Its Relevance for Neutrino Nucleosynthesis

Phys. Rev. Lett. 98, 082501 – Published 23 February 2007

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