Improved limits on $\beta^+$EC and ECEC processes in $^{74}$Se

A. S. Barabash; V. B. Brudanin; A. A. Klimenko; S. I. Konovalov; A. V. Rakhimov; E. N. Rukhadze; N. I. Rukhadze; Yu. A. Shitov; I. Stekl; G. Warot; V. I. Umatov

doi:10.1016/j.nuclphysa.2020.121697

Improved limits on $\beta^+$EC and ECEC processes in $^{74}$Se

Nuclear Experiment 2020-03-18 v1

Authors: A. S. Barabash , V. B. Brudanin , A. A. Klimenko , S. I. Konovalov , A. V. Rakhimov , E. N. Rukhadze , N. I. Rukhadze , Yu. A. Shitov , I. Stekl , G. Warot , V. I. Umatov

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Abstract

New limits on $\beta^+$ EC and ECEC processes in $^{74}$ Se have been obtained using a 600 cm $^3$ HPGe detector and an external source consisting of 1600 g of a natural selenium powder. For different $\beta^+$ EC and ECEC transitions (to the ground and excited states) obtained limits are on the level $\sim (0.2-4.8)\times10^{19}$ yr at 90\% C.L. In particular, for the potentially resonant transition into the 1204.2 keV excited state of $^{74}$ Ge a lower half-life limit of $1.1\times10^{19}$ yr at 90\% C.L. has been obtained. Possibility to increase the sensitivity of such measurements is discussed.

Keywords

electron-positron annihilation cross sections precision measurements in physics nuclear excited states

Cite

@article{arxiv.2001.07069,
  title  = {Improved limits on $\beta^+$EC and ECEC processes in $^{74}$Se},
  author = {A. S. Barabash and V. B. Brudanin and A. A. Klimenko and S. I. Konovalov and A. V. Rakhimov and E. N. Rukhadze and N. I. Rukhadze and Yu. A. Shitov and I. Stekl and G. Warot and V. I. Umatov},
  journal= {arXiv preprint arXiv:2001.07069},
  year   = {2020}
}

Comments

16 pages, 3 figures. arXiv admin note: text overlap with arXiv:hep-ex/0610046

Improved limits on $\beta^+$EC and ECEC processes in $^{74}$Se

Abstract

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