Karakoc, M., Zegers, R. G. T., Brown, B. A., Fujita, Y., Adachi, T., Boztosun, I., Fujita, H., Csatlos, M., Deaven, J. M., Guess, C. J., Gulyas, J., Hatanaka, K., Hirota, K., Ishikawa, D., Krasznahorkay, A., Matsubara, H., Meharchand, R., Molina, F., Okamura, H., Ong, H. J., Perdikakis, G., Scholl, C., Shimbara, Y., Susoy, G., Suzuki, T., Tamii, A., Thies, J. H. and Zenihiro, J. (2014). Gamow-Teller transitions in the A=40 isoquintet of relevance for neutrino captures in Ar-40. Phys. Rev. C, 89 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

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. Purpose: This study was aimed at resolving the ambiguity between the results from the Ar-40(p, n) charge-exchange and Ti-40 beta-decay data. Method: Shell-model calculations in the sd-pf shell with a new interaction (WBMB-C) were used to study differences between the structure of the transitions from Ar-40 and Ti-40. Distorted-wave Born approximation reaction calculations were used to investigate uncertainties in the extraction of Gamow-Teller strength from the Ar-40(p, n) data. New high-resolution data for the Ar-40(He-3,t) reaction were used to gain further insight into the charge-exchange reaction mechanism and to provide more information to test the validity of the shell-model calculations. Results: The shell-model calculations showed that interference between amplitudes associated with pf and sd components to the low-lying Gamow-Teller transitions, in combination with a difference in Coulomb energy shifts for Ar-40 and Ti-40, can produce the differences on the scale of those observed between the Ar-40 charge-exchange and Ti-40 beta-decay data. In combination with the difference in nuclear penetrability of the (p, n) and (He-3,t) probes, the different contributions from amplitudes associated with transitions in the pf and sd shells are likely also responsible for the observed discrepancy between the ratio of the cross sections for the low-lying 1(+) states in the Ar-40(p, n) and Ar-40(He-3,t) data. Conclusions: On the basis of this study, it is recommended to use Gamow-Teller strengths extracted from the Ar-40(p, n) data, not the Ti-40 beta-decay data, for the calculation of neutrino capture rates. Further theoretical studies are required to achieve a consistent quantitative description for the energy differences between low-lying 1(+) states in K-40 and Sc-40 and the experimentally observed Gamow-Teller strengths.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Karakoc, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zegers, R. G. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brown, B. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fujita, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Adachi, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boztosun, I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fujita, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csatlos, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deaven, J. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guess, C. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gulyas, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatanaka, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hirota, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ishikawa, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Krasznahorkay, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Matsubara, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Meharchand, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Molina, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Okamura, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ong, H. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perdikakis, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scholl, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shimbara, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Susoy, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Suzuki, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tamii, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Thies, J. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zenihiro, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-435642
DOI: 10.1103/PhysRevC.89.064313
Journal or Publication Title: Phys. Rev. C
Volume: 89
Number: 6
Date: 2014
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1089-490X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SPECTROMETER GRAND RAIDEN; BETA-DECAY; INTERMEDIATE ENERGIES; MAGNETIC SPECTROMETER; NUCLEI; SCATTERING; TI-40; DETECTORMultiple languages
Physics, NuclearMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/43564

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