Published January 2017 | Version v1
Journal article Metadata-only

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

Creators

  • 1. Univ Jyvaskyla, Dept Phys, POB 35, FI-4 0014 Jyvaskyla (Finland)
  • 2. Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette (France)

Description

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+13 s were obtained for 240Es and 236Bk, respectively. Two groups of alpha 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. (authors)

Availability note (English)

Available from doi: http://dx.doi.org/10.1016/j.physletb.2016.11.038

Additional details

Identifiers

DOI
10.1016/j.physletb.2016.11.038;

Publishing Information

Journal Title
Physics Letters. Section B
Journal Volume
764
Journal Page Range
p. 265-270
ISSN
0370-2693

INIS

Country of Publication
Netherlands
Country of Input or Organization
France
INIS RN
53103356
Subject category
S73: NUCLEAR PHYSICS AND RADIATION PHYSICS; S07: ISOTOPES AND RADIATION SOURCES;
Descriptors DEI
ALPHA PARTICLES; BERKELIUM 236; BISMUTH 209; EINSTEINIUM 240; ELECTRON CAPTURE; EVAPORATION; FISSION; HALF-LIFE; MEV RANGE; NEUTRON-DEFICIENT ISOTOPES; NUCLEAR DECAY; RECOILS; SATURATION; SULFUR 34
Descriptors DEC
ACTINIDE NUCLEI; BERKELIUM ISOTOPES; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; BISMUTH ISOTOPES; CAPTURE; CHARGED PARTICLES; DECAY; EINSTEINIUM ISOTOPES; ELECTRON CAPTURE RADIOISOTOPES; ENERGY RANGE; EVEN-EVEN NUCLEI; HEAVY NUCLEI; IONIZING RADIATIONS; ISOTOPES; LIGHT NUCLEI; NUCLEAR REACTIONS; NUCLEI; ODD-EVEN NUCLEI; ODD-ODD NUCLEI; PHASE TRANSFORMATIONS; RADIATIONS; RADIOISOTOPES; STABLE ISOTOPES; SULFUR ISOTOPES