αdecay of97249Bk and levels in95245Am

COUPLED-CHANNELS STUDY OF α-DECAY RATES FOR DEFORMED NUCLEI

“…As a result, the component to the low-lying rotational bands is dominant or comparable with respect to that to the favored band. 5 The representative example is the α decay of 243 Bk from its ground state 3/2 − to three rotational bands in 239 Am (the ground-state rotational band K π = 5/2 − , the second rotational band K π = 5/2 + , and the favored rotational band K π = 3/2 − ). Fig.…”

“…For example, combining α and γ spectra is a useful tool to probe the structure properties of nuclei, such as shape coexistence, new isomers, and energy spectrum of heavy and even superheavy nuclei. [1][2][3][4][5] Since the work of Gamow, there have been many approaches for α decay. They fall into into three categories: empirical study, 6,7 semiclassical approximation, [8][9][10][11] and solving Schrödinger equation for quasibound states.…”

Systematic research on α-decay rates of spherical and deformed nuclei

“…As a consequence, the component to the ground-state rotational band is dominant or comparable with respect to that to the favored band, such as the recently measured α decay of 249 Bk [13]. Within the MCCM, the α decay of odd-mass Bk isotopes from their ground states to more than one rotational bands in the daughter Am nuclei were investigated in Ref.…”

“…All of these are exciting subjects in contemporary nuclear physics. An experimental combination of α decay and γ emission has been widely used as powerful nuclear spectroscopic tools for neutron-deficient medium-mass nuclei [3][4][5][6][7][8] and for heavy and superheavy nuclei [9][10][11][12][13]. An experimental proof for the persistence of the Z = 82 shell gap at the neutron-deficient side has been provided by the α decay of even-even nuclei [14,15].…”

Role of quasiparticle structure in α decay of superheavy nuclei

“…If multiple states are populated, we assume a fast electromagnetic decay to a lower-lying state if an E 1, M1, or E 2 transition is allowed. Note, it is known that low-lying rotational band members built on Nilsson states are populated in α decay [53][54][55][56], but we are not taking this additional complication explicitly into account. The energies of the α decays use the Q α values in Table I, assumed to correspond to the ground-state-to-ground-state transition and account for the excitation energy of the one-quasi-proton states in both parent and daughter.…”