Microscopic calculations of weak decays in superheavy nuclei

Abstract

Half-lives of β + decay and electron capture are studied in some selected superheavy nuclei produced in hot-fusion reactions, namely, 290 Fl, 293 Mc, 294 Lv, and 295 Ts. The nuclear structure is described microscopically from deformed self-consistent Skyrme Hartree-Fock mean-field calculations that include pairing correlations. The sensitivity of the half-lives to deformation and to the QEC energies, which are still not determined experimentally, are studied. The results are compared with phenomenological α-decay half-lives, showing that the latter decay mode is dominant in this mass region.

β -decay properties of neutron-rich Ca, Ti, and Cr isotopes

“…To describe GT transitions, we add to the mean field separable spin-isospin residual interactions in the ph and pp channels, which are treated in a deformed pnQRPA [24-27, 36, 37]. According to previous calculations within this formalism [33][34][35]38], we use the values χ ph GT = 0.15…”

“…In Refs. [33][34][35] the decay properties of neutronrich isotopes in the mass region 32 < Z < 46 and 50 < N < 82 were studied within a deformed pnQRPA based on a self-consistent Hartree-Fock (HF) mean field formalism with Skyrme interactions and pairing correlations in the BCS approximation. Residual spin-isospin interactions were also included in the particle-hole (ph) and particle-particle (pp) channels [36,37].…”

Structural evolution in germanium and selenium nuclei within the mapped interacting boson model based on the Gogny energy density functional

“…Their structure and decay patterns have been extensively studied in recent years both experimentally [4][5][6][7] and theoretically [8][9][10][11][12][13][14][15][16]. Among the theoretical approximations used to study those nuclei are the shell model (SM) [8][9][10], the energy density functional (EDF) framework [11][12][13][14] and the algebraic approach [15,16]. The shape transitions in the neighborhood of the neutron sub-shell closure N = 40 have also received considerable attention [6,7,12,13].…”

Electron-capture decay in isotopic transfermium chains from self-consistent calculations

“…To complete this information in other cases, the α-decay half-lives have been estimated from phenomenological formulas that depend on the Q α energies, using values taken from experiment [45] that can be seen in table I with their uncertainties. Following the same approach as in [38], four different parametrizations are used, which have been fitted to account for the properties of SHN. Namely, they are the formula by Parkhomenko and Sobiczewski [69] (label 1 in the x-axis of the next figures), the Royer formula [70] (label 2), and the Viola-Seaborg formula [71] with two different sets of parameters from [69] (label 3) and [31,72] (label 4).…”