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Towards saturation of the electron-capture delayed fission probability: The new isotopes 240 Es and 236 Bk
Journal article published in 2017 by
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,
C.-H. E. Düllmann ,
T. Grahn,
K. Hauschild,
A. Herzán
and other authors.
,
J. Khuyagbaatar,
J. Uusitalo,
P. T. Greenlees,
K. Auranen,
H. Badran,
M. Block,
R. Briselet,
D. M. Cox,
M. Dasgupta,
A. Di Nitto,
C.-H. E. Düllmann ,
T. Grahn,
K. Hauschild,
A. Herzán
and other authors.
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 22ˍ₆⁺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.