Discovery of new proton emitters Re and Ta

R.D. Page, P.J. Woods, R.A. Cunningham, T. Davinson, N.J. Davis, S. Hofmann, A.N. James, K. Livingston, P.J. Sellin, A.C. Shotter

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The heaviest known examples of proton radioactivity, Re and Ta, have been discovered. Evaporation residues from fusion reactions of 300 MeV Ni ions with Cd targets have been mass separated in flight and implanted into a double-sided silicon strip detector. The measured proton energies, total half-lives, and proton branching ratios are 1261±6 keV, 790±160 μs, (91±10)%, and 1022±13 keV, 165 ms, ≈100% for Re and Ta, respectively, indicating that the protons are emitted from a d orbital in each case. An energy of 6537±16 keV has been measured for the Re alpha decay branch.
Original languageEnglish
Pages (from-to)1287-1290
Number of pages4
JournalPhysical Review Letters
Issue number9
Publication statusPublished - 2 Mar 1992


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