Towards saturation of the electron-capture delayed fission probability: The new isotopes Es-240 and Bk-236
- Konki, J
- Khuyagbaatar, J
- Uusitalo, J
- Greenlees, T
- Auranen, K
- Badran, H
- Block, M
- Briselet, R
- Cox, DM
- Dasgupta, M
- Di Nitto, A
- Duellmann, Ch E
- Grahn, T
- Hauschild, K
- Herzan, A
- Herzberg, R-D
- Hessberger, FP
- Hinde, DJ
- Julin, R
- Juutinen, S
- Jaeger, E
- Kindler, B
- Krier, J
- Leino, M
- Lommel, B
- Lopez-Martens, A
- Luong, DH
- Mallaburn, M
- Nishio, K
- Pakarinen, J
- Papadakis, P
- Partanen, J
- Peura, P
- Rahkila, P
- Rezynkina, Kseniia
- Ruotsalainen, P
- Sandzelius, M
- Saren, J
- Scholey, C
- Sorri, J
- Stolze, S
- Sulignano, B
- Theisen, Ch
- Ward, A
- Yakushev, A
- Yakusheva, V
DOIAbstract
The 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 View the MathML source6(2)s and View the MathML source22−6+13s were obtained for 240Es and 236Bk, respectively. Two groups of α particles with energies View the MathML sourceEα=8.19(3)MeV and View the MathML source8.09(3)MeV were unambiguously assigned to 240Es. Electron-capture delayed fission branches with probabilities of 0.16(6)0.16(6) and 0.04(2)0.04(2) were measured for 240Es and 236Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabi...
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