Precision measurement of 65Zn electron-capture decays with the KDK coincidence 
setup

The KDK Collaboration,; Hariasz, L.; Di Stefano, P.C.F.; Stukel, M.; Rasco, B.C.; Rykaczewski, K.P.; Brewer, N.T.; Grzywacz, R.K.; Lukosi, E.D.; Stracener, D.W.; Mancuso, M.; Petricca, F.; Ninkovic, J.; Lechner, P.

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Precision measurement of 65Zn electron-capture decays with the KDK coincidence setup

MPS-Authors

The KDK Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hariasz, L.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Di Stefano, P.C.F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Stukel, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Rasco, B.C.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Rykaczewski, K.P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Brewer, N.T.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Grzywacz, R.K.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lukosi, E.D.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Stracener, D.W.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Mancuso, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Petricca, F.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ninkovic, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lechner, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

The KDK Collaboration, Hariasz, L., Di Stefano, P., Stukel, M., Rasco, B., Rykaczewski, K., et al. (2023). Precision measurement of 65Zn electron-capture decays with the KDK coincidence setup. Nuclear Data Sheets, 189, 224-234. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2023-314.

Cite as: https://hdl.handle.net/21.11116/0000-000F-1272-C

Abstract

65 Zn is a common calibration source, moreover used as a radioactive tracer in medical and biological studies. In many cases, γ-spectroscopy is a preferred method of 65Zn standardization, which relies directly on the branching ratio of Jπ(65Zn)=5/2−→Jπ(65Cu)=5/2− via electron capture (EC*). We measure the relative intensity of this branch to that proceeding directly to the ground state (EC0) using a novel coincidence technique, finding IEC0/IEC*=0.9684±0.0018. Re-evaluating the decay scheme of 65Zn by adopting the commonly evaluated branching ratio of Iβ+=1.4271(7)% we obtain IEC*=(50.08±0.06)%, and IEC^0=(48.50±0.06)%. The associated 1115 keV gamma intensity agrees with the previously reported NNDC value, and is now accessible with a factor of ~2 increase in precision. Our re-evaluation removes reliance on the deduction of this gamma intensity from numerous measurements, some of which disagree and depend directly on total activity determination. The KDK experimental technique provides a new avenue for verification or updates to the decay scheme of 65Zn, and is applicable to other isotopes.