Towards saturation of the electron-capture delayed fission probability: The new isotopes 240Es and 236Bk
- Konki, J.
- Khuyagbaatar, J.
- Uusitalo, J.
- Greenlees, P.T.
- Auranen, K.
- Badran, H.
- Block, M.
- Briselet, R.
- Cox, D.M.
- Dasgupta, M.
- Di Nitto, A.
- Düllmann, Ch.E.
- Grahn, T.
- Hauschild, K.
- Herzán, A.
- Herzberg, R.-D.
- Heßberger, F.P.
- Hinde, D.J.
- Julin, R.
- Juutinen, S.
- Jäger, E.
- Kindler, B.
- Krier, J.
- Leino, M.
- Lommel, B.
- Lopez-Martens, A.
- Luong, D.H.
- Mallaburn, M.
- Nishio, K.
- Pakarinen, J.
- Papadakis, P.
- Partanen, J.
- Peura, P.
- Rahkila, P.
- Rezynkina, K.
- Ruotsalainen, P.
- Sandzelius, M.
- Sarén, J.
- Scholey, C.
- Sorri, J.
- Stolze, S.
- Sulignano, B.
- Theisen, Ch.
- Ward, A.
- Yakushev, A.
- Yakusheva, V.
Publication date
January 2017
DOI Publisher
The Authors. Published by Elsevier B.V. ISSN
0370-2693 Citation count (estimate)
2Abstract
AbstractThe new neutron-deficient nuclei 240Es and 236Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from 240Es produced in the fusion–evaporation reaction 209Bi(34S,3n)240Es. Half-lives of 6(2)s and 22−6+13s were obtained for 240Es and 236Bk, respectively. Two groups of α particles with energies Eα=8.19(3)MeV and 8.09(3)MeV were unambiguously assigned to 240Es. Electron-capture delayed fission branches with probabilities of 0.16(6) and 0.04(2) were measured for 240Es and 236Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes
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