Two nucleon transfer reactions have been used to probe for correlations in nuclei but there have been doubts about the assumptions made and hence about the success of the analyses. An experimental study of the Ca-40(t,p)Ca-42 reaction at incident triton energies of 10-15 MeV/nucleon was made to determine if the one-step, two-nucleon transfer mechanism was dominant at these energies. Measurements were made with 28, 33, and 37.3 MeV incident energy and particular care was taken to measure absolute differential cross sections for transitions to several residual states in Ca-42. The analysis of all the data used the results of full finite-range calculations and care was taken to calculate all the one-step and two-step reaction channels in a consistent manner starting from a shell-model description of the relevant Ca isotopes with a single, large basis set of single-particle wave functions. Although a complete prediction of the data was not achieved. it is concluded that incident triton energies about 10 MeV/nucleon are still not enough for one-step, two-nucleon transfer to dominate the (t,p) reaction mechanism. Even with a full analysis, it was not possible to reliably extract the reaction amplitudes by fitting the data because of the effects of the discrete potential ambiguity when describing elastic scattering. Hence it is not possible to extract accurate data about two-nucleon correlations in nuclei from (t,p) reactions at these energies. Additionally, some measurements on the Ca-8(t,p)Ca-50 reaction with 37.3 MeV incident energy are presented. Using a similar analysis, calculations predicted the magnitude of the differential cross-section data and the structure of the angular distributions. The J(pi) of the second excited state of Ca-49 was shown to be 7/2(-).

Results from the NA36 experiment obtained with the /sup 32/S beam at the CERN SPS during the 1987 run are presented. Production of lambda particles by proton and /sup 32/S beams was studied. 8 figs.

Low-lying states in 137Pm have been investigated using the reactions 122Te(19F,4n)137Pm and 108Pd(32S,p2n)137Pm. Some new energy levels are reported and mean lifetimes have been measured. The second h11/2 proton crossing has been observed in the yrast band, whilst the first h11/2 proton crossing has been observed in the three quasiparticle positive-parity sidebands. There is also some evidence for the first h11/2 neutron alignment. The deformation deduced for the lowest measurable level agrees reasonably well with the predicted ground-state value. However it appears that a fairly smooth increase in deformation occurs between 133Pm and 135Pm, rather than an abrupt change between 135Pm and 137Pm predicted by the calculations.

Differential cross section data are presented for the elastic scattering of 33 MeV tritons from a range of nuclei from 12C to 232Th. These data have been analysed using a phenomenological optical model. Parameters are presented for three families of the real potential. A comparison of the triton optical model potential with those from a re-analysis of 3He scattering from fp shell nuclei has allowed the isospin dependence of the optical model potential for mass-3 projectiles to be obtained in this mass region.

The reaction $^{78}\mathrm{Se}$(t,p${)}^{80}$Se has been investigated with 17-MeV tritons. Twenty-eight levels of $^{80}\mathrm{Se}$ were observed up to an excitation energy of 5.2 MeV, and angular distributions have been extracted for twenty-two of them. Comparisons are made with distorted-wave Born-approximation calculations, allowing ${J}^{\ensuremath{\pi}}$ assignments to be made for most of the levels observed.

Absolute ground-state cross sections for ASe(t,p) are observed to increase about a factor of 2.5 from 82Se to 76Se. They exceed the (1g9/2)n expectation by a factor of twenty but are in reasonable agreement with a simple model allowing excitations in 1f5/2, 2p3/2, 2p1/2 and 1g9/2 orbitals.

The results of IBA 2 predictions for two-proton pick-up in the mass A=100 region have been compared with experimental data which were previously obtained using the (14C,16O) reaction on various target nuclei in this mass region. It is found that the IBA 2 model can reproduce the relative ground-state transition strengths in the even Pd, Ru and Mo isotopes; however, it cannot account for the observed relative strengths of the first excited 0+ state in the Mo isotopes. For these states a comparison has been made between the pick-up data obtained in the present work, alpha pick-up data, and two-neutron transfer data. The results of such a comparison indicate that the 02+ states in the Mo isotopes change from having a predominantly proton structure for N<56 to having a predominantly neutron structure for N>58.

The (14C,16O) reaction on Cd isotopes has been investigated at an energy of 60 MeV. Relative spectroscopic strengths to the ground states are found to decrease nearN=60.

The (14C, 16O) reaction on even Ru and Pd isotopes has been investigated at 60 MeV bombarding energy. Relative spectroscopic strengths for transitions to the ground states are found to decrease suddenly at N=60. Evidence is presented which suggests that a significant contribution to the reaction mechanism for transfers to the ground states could be due to the sequential transfer of the protons. Large two-proton hole components are found in the first excited 0+ states of the light Mo isotopes.

The reaction $^{80}\mathrm{Se}$(t,p)$^{82}\mathrm{Se}$ has been studied with a 15 MeV triton beam. Twenty-four energy levels in $^{82}\mathrm{Se}$ have been identified up to approximately 5.0 MeV excitation, 12 of which were previously unreported. Angular distributions were measured and compared with distorted-wave Born approximation calculations in order to make $L$ (and hence ${J}^{\ensuremath{\pi}}$) assignments.

A measurement of the mass excess of110Pd and114Pd has been made by detecting emergent16O ions in aQ3D magnetic spectrometer using the112Cd(14C,16O)110Pd and116Cd(14C,16O)114Pd reactions at 60 MeV. The results are compared with theoretical predictions.