Nick Jelley

Abstract:

Detailed angular distributions using a position sensitive counter telescope were measured for all four possible single-nucleon transfer reactions induced by a 114 MeV 11B beam on 26Mg. Dififractive oscillations observed in the transfer data are reproduced by the distorted-wave Born-approximation analysis. A well determined class of optical potentials, which are strongly absorbing in the nuclear interior but nearly transparent at the surface were obtained by fitting the entrance channel elastic scattering data. Spectroscopic factors for final target states were deduced, in good agreement with those obtained from light ion experiments. © 1975.

Abstract:

A simple mass equation is derived and is shown to provide a good description of the masses of the recently measured TZ=52 nuclei in the s-d shell. A comparison is made with the method of Garvey et al. and predictions of masses and of the stability of neutron-excess light nuclei are given for both methods. NUCLEAR STRUCTURE Derived mass equation based on shell model; compared predictions with method of Garvey et al. © 1975 The American Physical Society.

Abstract:

The radiative decay properties of the first 16 bound states in 17N with Ex < 5.8 MeV have been studied using the 11B(7Li, pγ)17N reaction at E = 6 MeV. Proton-gamma coincidence data were taken with an annular particle detector located at 180° and a Ge(Li) detector placed at θγ = 3°, 45° and 90°. Angular distributions, branching ratios and Doppler shifts were measured. The resulting energies (keV), lifetimes (fs) and spin-parity assignments (those in brackets are probable assignments) were: (1374, 93±35, 3 2-), (1850, > 1 ps, 1 2+), (1907, > 1 ps, ( 5 2-)), (2526, > 1 ps, ( 5 2+)), (3129, 275±80, ( 7 2-)), (3203, < 30, ( 3 2-)), (3629, > 1 ps, ( 9 2-)), (3663, < 350), (3906, 52±22, ( 7 2-)), (4006, < 15, ( 3 2+)), (4208,< 70), (4415, < 60),(5170, < 60), (5195,< 95), (5514, < 100, ( 3 2-)), (5770, < 120). The properties of these levels are interpreted in terms of a weak coupling model in which a p 1 2 proton hole is coupled to levels in 18O or two proton holes are coupled to the K = 1 2+ g.s. band in 19F. A shell model calculation which includes 2p-1h negative parity states and 3p-2h positive parity states is also shown to provide a reasonable description of the bound states of 17N. © 1974.