D. S. Jamieson

Towards 26Na via (d,p) with SHARC and TIGRESS and a novel zero-degree detector

Nucleon transfer experiments have in recent years begun to be exploited in the study of nuclei far from stability, using radioactive beams in inverse kinematics. New techniques are still being developed in order to perform these experiments. The present experiment is designed to study the odd-odd nucleus 26Na which has a high density of states and therefore requires gamma-ray detection to distinguish between them. The experiment employed an intense beam of up to 3×107 pps of 25Na at 5.0 MeV/nucleon from the ISAC-II facility at triumf. The new silicon array SHARC was used for the first time and was coupled to the segmented clover gamma-ray array TIGRESS. A novel thin plastic scintillator detector was employed at zero degrees to identify and reject reactions occurring on the carbon component of the (CD)2 target. The efficiency of the background rejection using this detector is described with respect to the proton and gamma-ray spectra from the (d,p) reaction.

Nuclear structure of Cd112 studied through the Cd111(d⃗,p) reaction

The nuclear structure of Cd-112 has been investigated with the Cd-111((d)over-right-arrow, p)Cd-112 reaction. Isotopically enriched targets of Cd-111 were bombarded with 22 MeV polarized deuterons, and reaction products were analyzed with a magnetic spectrograph. Angular distributions and analyzing powers were determined for 129 states, 49 of which are newly observed, up to approximately 4.2 MeV in excitation energy. The observed angular distributions were compared with distorted wave Born approximation (DWBA) and adiabatic distorted wave approximation (ADWA) calculations to extract the spectroscopic factors. Two-quasineutron configurations involving coupling to the s(1/2) orbital are suggested. The sum of spectroscopic strengths extracted by using the ADWA for the individual l transfers are combined with previous results from the Cd-111((d)over-right-arrow, t) reaction and show good agreement with the 2j + 1 sum rule, whereas those extracted with the DWBA calculations are significantly less.

Investigating the nature of the Er isotopes with ( p , t ) reactions

A series of (p,t) reactions have been performed at the Maier-Leibnitz Laboratory using beams of 22 or 24 MeV protons, and the reaction products were analysed with the Q3D spectrograph. The goals of the measurements were to investigate the population of low-lying states in 160,162,164,166Er. A number of low-lying 0+ states have been observed, and their population strengths relative to the ground states extracted. The results confirm the strong population of the 0+_2 state in 164Er observed previously, and that the 0+_2 states in 160,162Er are also strongly populated, with strengths in the range of 13% to 20% relative to the ground state population. The strength in 160Er is consistent with that observed in other N=92 isotones, and suggest a common structural feature, possibly related to shape coexistence and the role that the 11/2-[505] configuration is playing in the 0+_2 states in the N=90 isotones.

2 1 + to 3 1 + γ width in Na 22 and second class currents

A previous measurement of the

21+ to 31+ γ width in Na22 and second class currents

\beta-\gamma

21+ to 31+ γ width in Na 22 and second class currents 21+ to 31+ γ WIDTH in Na 22 ⋯ S. TRIAMBAK et al.

directional coefficient in

Shell evolution approaching the N=20 island of inversion: Structure of 26Na

^{22}

A Search for

Na

0^+

\beta

States in

decay was used to extract recoil-order form factors. The data indicate the requirement of a significant induced-tensor matrix element for the decay.This conclusion largely relies on a Standard-Model-allowed weak magnetism form factor which was determined using an unpublished value of the analog