6533b7d1fe1ef96bd125bb91

RESEARCH PRODUCT

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

Joonas KonkiJ. KhuyagbaatarJuha UusitaloPaul GreenleesKalle AuranenHussam BadranM. BlockR. BriseletD. M. CoxM. DasguptaA. Di NittoCh. E. DüllmanTuomas GrahnK. HauschildAndrej HerzanR.-d. HerzbergF. P. HeßbergerD. J. HindeRauno JulinSakari JuutinenE. JägerB. KindlerJ. KrierMatti LeinoB. LommelA. Lopez-martensD. H. LuongM. MallaburnK. NishioJanne PakarinenPhilippos PapadakisJari PartanenPauli PeuraPanu RahkilaPanu RuotsalainenMikael SandzeliusJan SarénCatherine ScholeyJuha SorriSanna StolzeB. SulignanoCh. TheisenA. WardA. YakushevV. Yakusheva

subject

fusion-evaporation reactionsisotoopitmasselectron-capture delayed fissionα decay

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) sand 22+13−6swere obtained for 240Es and 236Bk, respectively. Two groups of αparticles with energies Eα=8.19(3) MeVand 8.09(3) MeVwere 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. peerReviewed

yearjournalcountryeditionlanguage
2017-01-01
http://urn.fi/URN:NBN:fi:jyu-201612024931