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

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RESEARCH PRODUCT

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

Rauno Julin J. Khuyagbaatar Bettina Lommel Juha Sorri Kalle Auranen R. Briselet Philippos Papadakis R-d Herzberg Paul Greenlees K. Hauschild Pauli Peura J. Krier Katsuhisa Nishio Panu Rahkila S. Juutinen Sanna Stolze Joonas Konki B. Sulignano Michael Block Egon Jäger Ch. Theisen Mahananda Dasgupta Alexander Yakushev Tuomas Grahn M. J. Mallaburn Jari Partanen K. Rezynkina Janne Pakarinen A. Ward Andrej Herzan Duc Huy Luong Mikael Sandzelius David Hinde V. Yakusheva Panu Ruotsalainen Juha Uusitalo Daniel Cox A. Di Nitto Jan Sarén H. Badran Ch. E. Düllmann Birgit Kindler F. P. Heßberger A. Lopez-martens Matti Leino C. Scholey

subject

Electron-capture delayed fission Nuclear and High Energy Physics Electron capture Fission Fusion–evaporation reaction 236 [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]236 Bk 01 natural sciences 7. Clean energy Recoil separator Nuclear physics fusion-evaporation reactions E 236Bk 240Es 240 Es 0103 physical sciences ddc:530 010306 general physics α decay isotopes Physics 240 Isotope ta114 Isotopes with mass 236–240 010308 nuclear & particles physics lcsh:QC1-999 Exponential function Bk mass Atomic physics Saturation (chemistry)Fusion–evaporation reactions α particles lcsh:Physics Radioactive decay

description

Abstract The new neutron-deficient nuclei 240 Es and 236 Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from 240 Es produced in the fusion–evaporation reaction 209 Bi( 34 S,3n) 240 Es. Half-lives of 6 ( 2 ) s and 22 − 6 + 13 s were obtained for 240 Es and 236 Bk, respectively. Two groups of α particles with energies E α = 8.19 ( 3 ) MeV and 8.09 ( 3 ) MeV were unambiguously assigned to 240 Es. Electron-capture delayed fission branches with probabilities of 0.16 ( 6 ) and 0.04 ( 2 ) were measured for 240 Es and 236 Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.

year	journal	country	edition	language
2016-11-24

10.1016/j.physletb.2016.11.038 https://hal.archives-ouvertes.fr/hal-01554833