Decay properties of Bk97243 and Bk97244

Abstract

Electron capture decays of 243 Bk and 244 Bk have been studied by measuring the γ-ray spectra of mass-separated sources and level structures of 243 Cm and 244 Cm have been deduced. In 243 Cm, EC population to the ground state, 1/2 + [631], and 1/2 + [620] Nilsson states have been observed.The octupole K π =2 − band has been identified in 244 Cm at 933.6 keV. In addition, spins and parities have been deduced for several other states and two-quasiparticle configurations have been tentatively assigned to them.

Stability of the heaviest elements: K isomer in No250

“…[6,26,28,29]) as well as in other N = 148 isotones. For instance, a recent study of 244 Cm underlines the presence of a sideband with spin and parity K π = 2 − and a bandhead at 933.6 keV, interpreted as an octupole vibrational band [30]. Clearly, more detailed investigations should be performed in order to unambiguously outline the decay path of the isomeric state in 250 No and assign its spin and parity.…”