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

Journal Article · Fri Feb 23 00:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.082501· OSTI ID:20960140

Byelikov, A; Kalmykov, Y; Neumann-Cosel, P von; Richter, A; Shevchenko, A ^[1]; Adachi, T; Fujita, Y; Shimbara, Y ^[2]; Fujita, H ^[3]; Fujita, K; Hatanaka, K; Kawase, K; Nakanishi, K; Sakamoto, N; Sakemi, Y; Shimizu, Y; Tameshige, Y; Tamii, A; Yosoi, M ^[4]; Heger, A ^[5]

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1. Institut fuer Kernphysik, Technische Universitaet Darmstadt, D-64289 Darmstadt (Germany)
2. Department of Physics, Osaka University, Toyonaka, Osaka 560-0043 (Japan)
3. School of Physics, University of the Witwatersrand, PO Wits, Johannesburg 2050 (South Africa)
4. Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047 (Japan)
5. Theoretical Astrophysics Group, MS B227, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

The Gamow-Teller strength distributions below the particle threshold in {sup 138}La and {sup 180}Ta, deduced from high-resolution measurements of the ({sup 3}He,t) reaction at 0 deg., 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 {sup 138}La in the Universe can be made that way. Neutrino nucleosynthesis also contributes significantly to the abundance of {sup 180}Ta but the magnitude depends on the unknown branching ratio for population of the long-lived isomer.

• OSTI ID: 20960140
• Journal Information: Physical Review Letters, Vol. 98, Issue 8; Other Information: DOI: 10.1103/PhysRevLett.98.082501; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABUNDANCE
BRANCHING RATIO
GAMOW-TELLER RULES
HELIUM 3 BEAMS
HELIUM 3 REACTIONS
ISOMERS
LANTHANUM 138
NEUTRINOS
NUCLEOSYNTHESIS
TANTALUM 180