Towards saturation of the electron-capture delayed fission probability: The new isotopes 240Es and 236Bk

Towards saturation of the electron-capture delayed fission probability: The new isotopes 240Es and 236Bk

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 6(2)s and 22−6+13s were obtained for 240...

Full description

Bibliographic Details
Main Authors: J. Konki, J. Khuyagbaatar, J. Uusitalo, P.T. Greenlees, K. Auranen, H. Badran, M. Block, R. Briselet, D.M. Cox, M. Dasgupta, A. Di Nitto, Ch.E. Düllmann, T. Grahn, K. Hauschild, A. Herzán, R.-D. Herzberg, F.P. Heßberger, D.J. Hinde, R. Julin, S. Juutinen, E. Jäger, B. Kindler, J. Krier, M. Leino, B. Lommel, A. Lopez-Martens, D.H. Luong, M. Mallaburn, K. Nishio, J. Pakarinen, P. Papadakis, J. Partanen, P. Peura, P. Rahkila, K. Rezynkina, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri, S. Stolze, B. Sulignano, Ch. Theisen, A. Ward, A. Yakushev, V. Yakusheva
Format: Article
Language:English
Published: Elsevier 2017-01-01
Series:Physics Letters B
Subjects:
Isotopes with mass 236–240
240Es
236Bk
α decay
Electron-capture delayed fission
Fusion–evaporation reactions
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269316307018
Description
Summary: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 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.
ISSN:0370-2693
1873-2445

Similar Items