First identification of Zn 58 β -delayed proton emission

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The β decay of Zn57 and Zn58 was investigated in an experiment at the National Superconducting Cyclotron Laboratory of Michigan State University. For the first time β-delayed proton emission from Zn58 was observed with a branching ratio of 0.7(1)%. The proton-energy spectrum allowed for probing the Gamow-Teller strength distribution above the proton-separation energy in the daughter nucleus. Moreover, the absolute branching ration for delayed-proton emission from Zn57 was found to be compatible with 100%.
Operation of the NSCL was supported by the National Science Foundation under Grant PHY-1102511. This work was supported by the National Science Center, Poland, under Contract No. UMO-2015/17/B/ST2/00581, by the US Department of Energy, Office of Science, Office of Nuclear Physics, under US DOE Grants No. DE-AC05-00OR22725 (ORNL) and No. DE-FG02-96ER40983 (UTK), by the fund source National Nuclear Security Administration Grant No. DEFC03- 03NA00143, and under the Stewardship Science Academic Alliance program through DOE Cooperative Agreement No. DE-FG52-08NA28552 (UTK). A.A.C. acknowledges support by the Polish Ministry of Science and Higher Education through Grant No. 0079/DIA/2014/43 (”Grant Diamentowy”). H.S. acknowledges support by the US National Science Foundation under awards PHY-1430152 (JINA Center for the Evolution of the Elements) and PHY-1102511. P.S. acknowledges support from MCIU/AEI/FEDER_UE (Spain) under Grant No. PGC2018-093636-B-I00.