Electromagnetic properties of low-spin states in102, 104Pd

Abstract

Electromagnetic transitions from low-lying 0 +, 2 +, 4 + and 3-states in lO2, a04pd have been studied using (p, 2n) and (p,p') reactions and Coulomb excitation. The E2 transition probabilities from the 0 + state in ~~ (13 W.u.) and from the 0 + state in ~~ (14 W.u.) are somewhat low for two-phonon states. Generally, the E2 transition rates are reasonably well reproduced by the IBA-2 and by the boson-expansion description. The intruding 0 + state (tl/2 = 14.3 ns) in l~ is connected to the 2 + and 2~-states via strong E2 transitions: B(E2; 0+~2+)=96___40W.u.; B(E2; 2~-~0+)=17 ill W.u.

Alternative solvable description of the E(5) critical point symmetry in the interacting boson model

“…It can be observed in Table III that these transitional rates increase with the increasing of N, of which the pattern is similar to that produced by the CQ. These transitional rates become closer to the corresponding E(5) results with the increasing of N except B(E2, 0 + 4 → 2 + 3 ) not included in (33), which is about 1.5 times larger than the corresponding E(5) value when N = 10. Except B(E2, 0 + 4 → 2 + 3 ), other B(E2) values of the EXT are slightly closer to the corresponding E(5) results than those of the CQ with the increasing of N for N = 5-10.…”

“…108 Pd, and 114,116 Cd, where "-" denotes either that the corresponding B(E2) value was not determined experimentally, or that the theoretical value was not provided in [9], the experimental data of 104 Ru were taken from [32][33][34], those of 108 Pd were taken from [35], those of 114 Cd were taken from [36], and those of 116 Cd were taken from [37,38], CQ N denotes the consistent-Q description at the critical point with N bosons. E(5) 104 Ru EXT SET 108 Pd EXT SET 116 Cd EXT SET CQ 8 114 Cd EXT SET CQ 9 0 + 1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 + 1 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1 …”

Coulomb excitation of neutron-rich Cd isotopes at REX-ISOLDE

“…Since the electromagnetic matrix elements of the Pd isotopes are well known [11,12], the experimental cross sections can be normalised to the absolute cross sections for target excitation. The cross sections for projectile and target excitation have been extracted from the respective γ-yields.…”

New results on

“…The intensities of photopeaks in these spectra are shown in figure 1. The curves show the mass gated distribution of γ -ray yields for known transitions in 102 Pd (Luontama et al 1986), 102 Ag (Treherne et al 1983) and 102 Cd (Treherne et al 1982, Alber et al 1992and Grawe et al 1995 as a function of energy loss, δE. By setting gates in the mass gated δE spectrum and carefully subtracting 102 Pd and 102 Ag a pure spectrum of 102 Cd with many new transitions was obtained, as shown in figure 2.…”