Showing papers by "R. Wadsworth published in 1987"
TL;DR: In this paper, a systematic study in the light rare earth (N 82), indicating that there is not a magic superdeformed nucleus in the region, was conducted, and striking population intensity differences are observed which are not explained by standard potential energy calculations.
Abstract: A systematic study in the light rare earth (N 82, indicating that there is not a 'magic' superdeformed nucleus in the region. Striking population intensity differences are observed which are not explained by standard potential energy calculations. Open problems, particularly in connection with feeding into and out of the superdeformed bands, are discussed.
39 citations
TL;DR: In this paper, the elastic scattering of 33 MeV tritons from a range of nuclei from 12 C to 232 Th was analyzed using a phenomenological optical model, and a comparison of the triton optical model potential with those from a re-analysis of 3 He scattering from fp shell nuclei has allowed the isospin dependence of the optical model for mass-3 projectiles to be obtained in this mass region.
29 citations
TL;DR: In this paper, the lifetimes of 20 nuclear energy levels have been measured in 132,134Nd, 133,135Pm and 134,136Sm using the recoil distance technique.
Abstract: The lifetimes of 20 nuclear energy levels have been measured in 132,134Nd, 133,135Pm and 134,136Sm using the recoil distance technique. The nuclear reactions employed for studying these nuclei were 92Mo+46Ti and 92Mo+50Cr at beam energies of 210 MeV and 230 MeV respectively. The measured transition strengths in the yrast bands in 132,134Nd and 135Pm show a marked decrease over the expected rotational values, whilst the equivalent values in the 134,136Sm isotopes show very little decrease in collectivity. Nuclear deformations have been deduced for the low-lying states using axially symmetric rotational model assumptions. The results are compared with theoretical ground-state deformation predictions, and also with the results of the Grodzins' phenomenological formula which is based on the energy of the first 2+ state. The nuclear deformations are consistent with a transition to well deformed rotors as the number of neutrons decreases and also as the number of protons increases towards Z=64.
27 citations
TL;DR: In this paper, the first clear evidence for the presence of the intruder i13/2 neutron orbital in this mass region has been seen, and a decay scheme has been developed from gamma-gamma coincidence data obtained using the TESSA3 spectrometer.
Abstract: Gamma-ray transitions have been observed for the first time in 135Sm using the Daresbury Recoil Separator. A decay scheme has been developed from gamma-gamma coincidence data obtained using the TESSA3 spectrometer. The first clear evidence for the presence of the intruder i13/2 neutron orbital in this mass region has been seen.
20 citations
TL;DR: In this article, the alpha decay of 223Th (T12/=0.6 s), formed in the reaction 83 MeV 208Pb(18O,3n), was observed in coincidence with the detection of alpha particles.
Abstract: Excited states in 215Rn and 219Ra were populated by the alpha decay of 223Th (T12/=0.6 s), formed in the reaction 83 MeV 208Pb(18O,3n). Out-of-beam gamma rays and conversion electrons were observed in coincidence with the detection of alpha particles. These measurements enabled the low-lying structure of 215Rn and 219Ra to be deduced. The strongly populated states are found to be connected by M1 transitions which suggest that their configuration is ( nu g92/)/sup /n.
13 citations
TL;DR: Levels in the neutron deficient 142 Gd and 142,144 Dy nuclei have been identified using multiple particle-gamma coincidence techniques in this article, and the new data are discussed in the context of the systematic trend toward deformation in light rare-earth nuclei and the disappearance of the Z = 64 subshell gap.
10 citations
TL;DR: In $70}\mathrm{Zn}$${(}^{16}$O${,}^{14}$C${)}^{72}$Ge, at 110 MeV, the first-excited first- excited state at 0.69 MeV has vanishingly small transfer strength.
Abstract: In $^{70}\mathrm{Zn}$${(}^{16}$O${,}^{14}$C${)}^{72}$Ge, at 110 MeV, the first-excited ${0}^{+}$ state at 0.69 MeV (commonly thought to be a two-proton excitation) has vanishingly small transfer strength\char21{}the upper limit is less than one percent of the ground state strength.
3 citations