Abstract:
In the present work, the effect of proton-neutron interaction and its different components, i.e., central, spinorbit, and tensor force, on proton shell-structure of odd-A Sc, F, and Li isotopes is studied within the nuclear shell
model framework. It has been observed that the central force possesses strong-orbital node (nl) and weak-spin
(j) dependency, and plays a key role in producing changes in proton shell-structure. The integrated effect of
proton shell-structure and proton single-particle strength in building the level structure of 49,53,55Sc, 23,25F, and 9
Li isotopes are also discussed. Proton single-particle strength in the level structure of above-mentioned nuclei
is studied using proton-transfer spectroscopic factors. It has been particularly discerned that the low energy of
the 3
2
−
1 state of 55Sc is caused by the weakening of the N = 34 semimagic gap, the high energy of the 1
2
+
1 state of 23F is originated from an increase in the energy gap between orbitals π1s1/2 and π0d5/2 at N = 14, and the high
energy of the 1
2
−
1 state of 9
Li is originated from the large energy gap between π0p1/2 and π0p3/2 orbitals which
remained nearly constant from 5
Li to 9
Li.
