Abstract
Enhancement of the monopole and dipole transitions in the low-lying state is discussed on the basis of the microscopic and macroscopic α cluster models. Theoretical calculation clearly demonstrates that the strength of the monopole and dipole transitions are strongly enhanced by the excitation in the relative motion of the α cluster and the residual nucleus. The transition strength induced by the α excitation appears as the discrete distribution, and its excitation energy is much lower than the excitation energy of the single nucleon excitation, which is expected from the naive mean field picture.
Highlights
Basic properties of ground state in nuclei can be described by mean field picture, in which individual nucleons perform single particle motions in a self-consistent mean field [1]
The picture of the α cluster structures is extended to much heavier systems beyond A = 40, such as 44Ti = α + 40Ca [2, 4, 5], neighboring nuclei of 94Mo = α + 90Zr [4, 6], and 212Po = α + 208Pb [4, 7]
We analyze the monopole and dipole transitions in the heavier systems, 44Ti and 104−110Te, by applying the macroscopic α cluster model, which is based on the double folding potential of the α particle and residual core nuclei
Summary
Basic properties of ground state in nuclei can be described by mean field picture, in which individual nucleons perform single particle motions in a self-consistent mean field [1]. Coherent excitations of such the single particle motion generate various collective excitations of the nuclei [1]. In the studies of the heavy systems, the macroscopic α cluster model, in which the local potential for the system of α – residual nucleus is an initial ingredient, are mainly applied. We analyze the monopole and dipole transitions in the heavier systems, 44Ti and 104−110Te, by applying the macroscopic α cluster model, which is based on the double folding potential of the α particle and residual core nuclei. From the calculation of the macroscopic α cluster model, we will demonstrate that the monopole and dipole transition is prominently enhanced at anomalously low excitation energy
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