Spectroscopy along flerovium decay chains. II. Fine structure in odd- A Fl289

Role of quasiparticle structure in α decay of superheavy nuclei

“…It will be interesting to see if the role of the quasiparticle structure, and particularly the influence of the high-orbitals, is identified as more data becomes available. There does appear to be some evidence of this in the most recent experiments on the fine structure seen in the 289 Fl decay chains [16,17]. Also, it will be important to account for possible decay chains with different characteristics arising from the same isotope [59] and to experimentally determine the Z [13,14] and A [60] of the SHN.…”

“…After the initial observation of α-decay fine structure, which indicated population of multiple excited states in nuclei along the decay chains, follow-up studies led to the identification of discrete γ -ray transitions in the decay schemes of 276 Mt (meitnerium, Z = 109) and 272 Bh (bohrium, Z = 107) [13,14], placing constraints on the models of quasiparticle structure for these nuclei [15]. Most recently, α-decay fine structure and electromagnetic decays have been observed along the decay chains of odd-A 289 Fl (flerovium, Z = 114) giving the first information on the excited levels and the one quasineutron structure of these nuclei [16,17].…”

“…The second column gives the Q value for the α decay, Q α (in MeV with uncertainties typically less than 0.5% of the absolute value) corresponding to the strongest α-decay branch, taken from the evaluated nuclear data files [43] or from Refs. [7,8,16,17,[44][45][46][47]. The experimental α-decay branching ratio is taken into account.…”

“…The third column has the decimal logarithm of the experimental half-life again from Refs. [7,8,16,17,[43][44][45][46][47]. Generally, the experimental uncertainties in the half-lives are small enough to be ignored but are included as error bars in Figs.…”