Penning-trap Q -value determination of the 71Ga(ν, e−)71Ge reaction using 
threshold charge breeding of on-line produced isotopes

Frekers, D.; Simon, M.C.; Andreoiu, C.; Bale, J.C.; Brodeur, M.; Brunner, T.; Chaudhuri, A.; Chowdhury, U.; Crespo López-Urrutia, Jose; Delheij, P.; Ejiri, H.; Ettenauer, S.; Gallant, A.T.; Gavrin, V.; Grossheim, A.; Harakeh, M.N.; Jang, F.; Kwiatkowski, A.A.; Lassen, J.; Lennarz, A.; Luichtl, M.; Ma, T.; Macdonald, T.D.; Mané, E.; Robertson, D.; Schultz, B.E.; Simon, Vanessa V.; Teigelhofer, A.; Dilling, J.

doi:10.1016/j.physletb.2013.04.019

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Penning-trap Q -value determination of the ⁷¹Ga(ν, e⁻)⁷¹Ge reaction using threshold charge breeding of on-line produced isotopes

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Crespo López-Urrutia, Jose
Division Prof. Dr. Joachim H. Ullrich, MPI for Nuclear Physics, Max Planck Society;

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Simon, Vanessa V.
TRIUMF;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Fakultät für Physik, Ruprecht-Karls-Universität Heidelberg;

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http://dx.doi.org/10.1016/j.physletb.2013.04.019
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Citation

Frekers, D., Simon, M., Andreoiu, C., Bale, J., Brodeur, M., Brunner, T., et al. (2013). Penning-trap Q -value determination of the ⁷¹Ga(ν, e⁻)⁷¹Ge reaction using threshold charge breeding of on-line produced isotopes. Physics Letters B, 722(4-5), 233-237. doi:10.1016/j.physletb.2013.04.019.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-FD63-5

Abstract

We present a first direct Q-value measurement of the ⁷¹Ga(ν,e⁻)⁷¹Ge reaction using the TITAN mass-measurement facility at ISAC/TRIUMF. The measurements were performed in a Penning trap on neon-like ⁷¹Ga²¹⁺ and ⁷¹Ge²²⁺ using isobar separation of the on-line produced mother and daughter nuclei through threshold charge breeding in an electron-beam ion trap. In addition, isoionic samples of ⁷¹Ga²¹⁺ and ⁷¹Ge²¹⁺ were stored concurrently in the Penning trap and provided a separate Q-value measurement. Both independent measurements result in a combined Q-value of 233.5±1.2 keV233.5±1.2 keV, which is in agreement with the previously accepted Q-value for the ν cross-section calculations. Together with a recent measurement of the ν-response from the excited states in ⁷¹Ge, we conclude that there are no further uncertainties in the nuclear structure, which could remove the persistent discrepancy between the SAGE and GALLEX calibration measurements performed with neutrinos from reactor-produced ⁵¹Cr and ³⁷Ar sources and the theoretical expectation.