Electric quadrupole moments of the first excited states of 194Pt, 196Pt and 198Pt

Coulomb Excitation of the 41+ States of 194,196,198Pt

“…Only data taken at values of s which were larger than or equal to the safe values were used in the subsequent analysis. In all cases, the minimum safe s values adopted are not less than those adopted by Gyapong et al (1986) in the analysis of the excitation probabilities of the first excited states. It is, of course, not necessarily the case that the onset of Coulomb-nuclear interference will occur at the same value of s for different excited states, nor that it will always be marked by a fall of Pexpl P Coul below unity (e.g.…”

“…Spectra of ions scattered through 174· 8° were recorded by an annular silicon surface-barrier detector and, in the case of 4He ions on targets enriched in 196Pt, spectra of ions scattered through 90° were also recorded using an Enge split-pole spectrometer. Details of the experimental procedures and the analysis of the resulting spectra were given by Gyapong et al (1986) and references therein. The spectra displayed by Gyapong et al (1986) show that both the 2t and 4{" states are reasonably strongly excited.…”

“…Details of the experimental procedures and the analysis of the resulting spectra were given by Gyapong et al (1986) and references therein. The spectra displayed by Gyapong et al (1986) show that both the 2t and 4{" states are reasonably strongly excited. However, the peaks corresponding to the excitation of the 2t states were not sufficiently well resolved to provide more than confirmation, within relatively large uncertainties, of previously measured B(E2) values.…”

“…Fig. 1 shows plots of the above-mentioned ratio as a function of s, the distance of closest approach of the nuclear surfaces, the definition of which was given by Gyapong et al (1986). The bombarding energies involved are also indicated in Fig.…”

“…The values used are given in Tables 4 and 5 of Gyapong et al (1986). The only addition to these matrix elements was the value of 2· 8+0·07 for <4i II M(E2)114i> of 194pt (Baktash etaL 1978).…”