Published January 1, 2014 | Version v1
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Gamow-Teller transitions in the A=40 isoquintet of relevance for neutrino captures in Ar-40

  • 1. Osaka Univ, Res Ctr Nucl Phys, Ibaraki, Osaka 5670047, Japan
  • 2. Inst Nucl Res MTA Atomki, H-4001 Debrecen, Hungary
  • 3. Univ Valencia, CSIC, Inst Fis Corpuscular, E-46071 Valencia, Spain

Description

Background: The Gamow-Teller response of Ar-40 is important for the use of liquid argon as a medium for neutrino detection. An ambiguity about the Gamow-Teller strength for the excitation of 1(+) states at 2290 and 2730 keV in K-40 results in a significant uncertainty for neutrino capture rates. This ambiguity is caused by the large discrepancy observed between strengths extracted from Ar-40(p, n) charge-exchange data and the transition strengths for the analog transitions studied in the beta decay of Ti-40.

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