Level structure of the double-shell closure system with Z=14 and N=20: 34Si

The level structure of the double-magic nucleus Si-34 (Z = 14, N = 20) was investigated by evaluating the available data. On the basis of experimental results from the beta-decay and fusion-evaporation reactions, we established the level scheme by assigning spin-parities up to 6(1) (+) at 6233 keV. The high energy positions of the excited states are consistent with the magicity at Si-34, such as the 2(2) (+) state of the spherical ground band at 4.519 MeV and the 3(-), 4(-), and 5(-) states of the one-particle one-hole cross-shell states at approximately 4.5 MeV. This nucleus, for a long time, has attracted much attention because of, on one side, a proton bubble structure in the ground state and, on the other side, a deformation in the second 0(+) state, 0(2) (+). By a comparison of the constructed level scheme with the shell model calculations, we describe the emerging structures in the ground and second 0(+) states and the negative-parity 3(-) states within the framework of the shell model context. We propose a deformed rotational band with the cascading 6(2) (+) - 4(1) (+) - 2(1) (+) transitions built on the 0(2) (+) state.

Automated summary

The level structure and properties of the double-magic nucleus Si-34 have been investigated using experimental results and shell model calculations. The study reveals that Si-34 has a proton bubble ground state and a deformed second 0(+) state, and proposes a deformed rotational band model.