Excitation energies and spins of the yrast superdeformed band inHg191

Abstract

The excitation energies and spins of the levels in the yrast superdeformed band of 191 Hg have been determined from two single-step γ transitions and the quasi-continuum spectrum connecting the superdeformed and normal-deformed states. The results are compared with those from theoretical mean-field calculations with different interactions. A discussion of pairing in superdeformed states is also included. PACS number(s): 23.20.Lv, 23.20.En, 27.80.+w

Constraining the Density Dependence of the Symmetry Energy With Nuclear Structure Properties

“…25,26 Comparing with the data, we see that the description for deexcitation energies can be improved by including the isoscalarisovector coupling. On the other hand, the difference between deexcitation energies of 194 Hg and 192 Hg is still large (about 1.5 MeV), as compared to the experimental value 0.7 MeV.…”

“…To pin down the theoretical uncertainty, it is thus helpful to further investigate the relationship between the DDSE and deexcitation energies of odd-odd nuclei. Moreover, though the isoscalar-isovector coupling improves the prediction on deexcitation energies, details seem model dependent, 25,26 as also seen in the NL3 and FSUGold. A scrutiny further on the ingredients that comprise of the nuclear potential seems necessary in order for improving the description for deexcitation energies of SSM.…”

Two-Particle Separation Energy Trends in the Superdeformed Well

“…However, quasicontinuum analyses have furnished measurements in 192 Hg [2] and 191 Hg [10], with candidate single-step links giving a lower limit on the energy in the latter.…”

“…The procedures followed in the present work are based on those developed and validated by Lauritsen et al [2,16] and are the same in detail as used for the neighboring isotope 191 Hg [10]. The intensities of the three lowestenergy transitions in the SD band in 190 Hg indicate the Figures 3(a) and 3(b) compare the known energies of the SD quasivacuum states in even-even nuclei in this region [2][3][4][5][6]8,9].…”

A systematic study of the superdeformation of Pb isotopes with relativistic mean field theory

“…The difficulty lies with observing the very weak discrete transitions which link SD levels with levels of normal deformation (ND levels). Until now, only several SD bands have been identified to exist the transitions from SD levels to ND levels in the A ∼ 190 region: two bands in 194 Hg [2,3], and one band in each of 194 Pb [4,5], 192 Pb [6], and 191 Hg [7]. Less precise measurements have been achieved in 192 Hg [8] and 195 Pb [9] following analysis of the quasi-continuum component of the decay.…”