First observation of gamma-rays from the proton emitterT. Bäck1, B. Cederwall1, K. Lagergren1, R. Wyss1, A. Johnson1, D. Karlgren1, P. Greenlees2, D. Jenkins3, P. Jones2, D.T. Joss4, R. Julin2, S. Juutinen2, A. Keenan2, H. Kettunen2, P. Kuusiniemi2, M. Leino2, A.-P. Leppänen2, M. Muikku5, P. Nieminen2, J. Pakarinen2, P. Rahkila2 and J. Uusitalo2
1 Department of Physics, Royal Institute of Technology, SE-10691 Stockholm, Sweden
2 Department of Physics, University of Jyväskylä, P.O. Box 35, FIN-40351, Jyväskylä, Finland
3 Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, UK
4 School of Chemistry and Physics, Keele University, Keele, Staffordshire, ST5 5BG, UK
5 STUK - Radiation and Nuclear Safety Authority, P.O. Box 14, 00881 Helsinki, Finland
(Received: 2 September 2002 / Published online: 25 March 2003)
Gamma-rays from the alpha- and proton-unstable nuclide have been observed for the first time. The gamma-rays were correlated with both a proton- and an alpha-particle decay branch, confirming that the nucleus decays by alpha and proton emission from a single ( 11/2-) state. The measurement confirms the previously determined half-lives for these particle decays but the present values are of higher precision. In addition, a longer half-life than determined in previous work was measured for the proton-unstable tentative ground state. The results are discussed in relation to structures in neighbouring nuclei and compared with a Strutinsky-type TRS calculation.
23.50.+z - Decay by proton emission.
23.60.+e - Alpha decay.
23.20.Lv - Gamma transitions and level energies.
21.10.Tg - Lifetimes.
© Società Italiana di Fisica, Springer-Verlag 2003