학술논문
Towards saturation of the electron-capture delayed fission probability: The new isotopes 240Es and 236Bk
Document Type
article
Author
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
Source
Physics Letters B, Vol 764, Iss C, Pp 265-270 (2017)
Subject
Language
English
ISSN
0370-2693
1873-2445
1873-2445
Abstract
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.