$\alpha$α clustering slightly above 100Sn in the light of the new experimental data on the superallowed $\alpha$α decay

Abstract

The recently observed α-decay chain 108 Xe → 104 Te → 100 Sn [K. Auranen et al., Phys. Rev. Lett. 121, 182501 (2018)] could provide valuable information on the α clustering in even-even nuclei slightly above the major shells Z = 50 and N = 50. In this work, this α-decay chain is studied theoretically within the framework of the density-dependent cluster model plus the twopotential approach. We calculate the α-decay half-lives of 104 Te and 108 Xe and study in detail their dependence on the Q value and the density-profile parameters of the core nucleus. Various physical properties of 104 Te, the heaviest nucleus with a doubly magic self-conjugate core + α, are calculated, with two different assumptions on the renormalization factor of the double-folding potential, which could be a useful reference for future experimental studies.

α-Cluster structure above double-shell closures and α-decay of 104Te

“…It is to be emphasized that the values of Γ γ , Γ α , and b α in Table 2 are calculated in accordance with the experimental data of Q α and T 1/2 for 104 Te. The results of Table 2 differ significantly from the results presented by D. Bai and Z. Ren for the same system [16] using the double-folding potential for the α + core interaction and a fixed strength parameter. In Ref.…”

“…3 ) and double-folding potentials for the ground state band. The first comparison is made with the calculation of Mohr [15] with double-folding potential and L-dependent strength parameter, and the second comparison is made with the calculation of D. Bai and Z. Ren [16] with double-folding potential and fixed strength parameter. In the two comparisons, the parameter R of the (1 + Gaussian)×(W.S.…”

“…The recent work of D. Bai and Z. Ren [16] shows an analysis of the α-cluster structure in 104 Te and 108 Xe in the framework of the density-dependent cluster model, taking into account the experimental results of Ref. [13].…”

Search for the $α$ + core structure in the ground state bands of $22 \leq Z \leq 42$ even-even nuclei

“…Due to experimental data published in 2018 by Auranen et al on 104 Te [20], further work was made on αclustering above the double shell closure at 100 Sn, such as D. Bai and Z. Ren [21], M. A. Souza et al [17], and T. T. Ibrahim et al [18], including the microscopic calculation of S. Yang et al [22], obtaining results compatible with the experimental α-decay half-life of 104 Te. Additional experimental data on energy levels, electromagnetic transition rates, half-lives of the excited states, etc.…”

Theoretical studies on α decays of even-even nuclei with the improved square-well cluster model

“…近年来, 实验研究发现, 在N=Z=50附近的一 些新核素会发生α衰变, 如 104 Te、 108 Xe等 [33] . 对这些新 核素的α衰变进行理论研究是当前原子核物理的热点 课题, 我们在这方面也取得了一些初步研究成果 [34] . 方势阱集团模型(square-well cluster model, SW)是 研究原子核α衰变的一个理论模型, 具有形式简洁、计 算方便等优点, 可以较好地解释重核区的一些偶偶核α 衰变实验数据 [13] .…”