2003MoZX, 2003MoZT: Activity produced by ¹⁹⁷Au(⁴⁰Ar,3n) E=188.4 and 196.9 MeV. ²³⁴Bk was identified using a gas-filled recoil separator, and by genetic correlations with daughter nuclides from the α-decay chain. Measured Eα=7850 keV 50. The data suggested the possible existence of an isomer in ²³⁴Bk (nearly 100 keV apart from the other observed state (2003MoZT)) from the observed long lifetime (or the variation of decay time of α events with a similar energy).

2016Ka13: ²³⁴Bk was produced from ¹⁹⁷Au(⁴⁰Ar,3n) reaction. ⁴⁰Ar beam, E=189.5 MeV, was delivered by the RIKEN heavy ion linear accelerator. Recoil products of interest (²³⁴Bk) were separated by RIKEN’s gas-filled recoil ion separator (GARIS), guided to a gas-jet chamber, stopped in helium gas and attached to KCL aerosols, collected and transported by a rotating wheel system to a position between seven pairs of Si PIN-diode detectors for α/SF spectroscopy. Measured 17 ²³⁴Bk α decays at the energies of 7.62-7.96 MeV, which were correlated with ²³⁰Am (β⁺/ε and then ²³⁰Pu α decay (11 counts) and fission events (6 counts)), and 17 decay chains of ²³⁴Bk (β⁺/ε). ²³⁴Bk T_1/2 was deduced from these results. 2010KaZV is an earlier report by the same group.

Q-value: ΔS(n)=278, ΔS(p)=173 (2021Wa16)

Q-value: S(2p)=4602 syst 337, Q(εp)=2821 syst 191 (2021Wa16)