Origin of termination of negative-parity bands

The cluster approach is applied to study the mechanism of termination of the negative-parity band built on the ground state of even-even nucleus. For the several even-even nuclei, the terminating spins are predicted. The method is suggested for the verification of the cluster interpretation of the band termination.

Figure 1

Nucleus-nucleus interaction potential for the ${}^4\mathrm{He}+{}^{70}\mathrm{Se}$ system at indicated angular momenta.

Figure 2

The same as in Fig. 1, but for the ${}^4\mathrm{He}+{}^{98}\mathrm{Ru}$ system.

Figure 3

Times of $E2$ transition and $\alpha$ decay as functions of angular momentum $J$ for the indicated nucleus.

Figure 4

Times of $E2$ transition and $\alpha$ decay as functions of angular momentum $J$ for the indicated nucleus.

Figure 5

Times of $E2$ transition and $\alpha$ decay as functions of angular momentum $J$ for the indicated nucleus.

Figure 6

Times of $E2$ transition and $\alpha$ decay as functions of angular momentum $J$ for the indicated nucleus.

Figure 7

The termination spin as a function of atomic number.

Figure 8

The estimated average kinetic energies $K_{\alpha }$ of the alpha clusters released by the indicated nuclei at $J=J_{\mathrm{term}},J_{\mathrm{term}}-2,J_{\mathrm{term}}-4$. The symbols related to the same nucleus are connected by dotted line.

Figure 9

The estimated average kinetic energies $K_{\alpha }$ of the alpha clusters released by the indicated nuclei at $J=J_{\mathrm{term}},J_{\mathrm{term}}-2,J_{\mathrm{term}}-4,...$. The symbols related to the same nucleus are connected by dotted line.

Figure 10

The $E2$-transition energy as a function of spin of indicated nuclei. The symbols related to the same nucleus are connected by dotted line.