A Q- value of 4.046 ±0.102 MeV has been determined for the two protons transfer reaction 160Gd(18O, 20Ne) 158Sm at 98.95 MeV. This result yields a first experimental measured value of − 65.738 ± 0.102 MeV for the mass excess of 158Sm, the nucleus far from stability. The result is compared with current theoretical predictions.

A Q-value of-4.076��0.151 MeV has been determined for the two-proton transfer reaction 160Gd (18O, 20Ne) 158Sm, which yields a first experimental measured value of -65.764��0.151 MeV for the mass excess of 158Sm, the nucleus far from stability. The result was compared with current theoretical predictions.

A semi-length focal plane detecting system for heavy ions was built and tested by 12+197Au, 16O+150Sm and 18O+156Gd reactions. The intrinsic resolutions of position and angle are 1, 1mm and 0.8�� respectively. The resolutions of energy loss ��E, residual energy ER and total energy ET obtained are 3.0%, 1.4% and 0.9% separately, by adopting a special method of data processing. The achievable mass resolution is estimated to be about 1.0% after necessary corrections for some signals concerned. Discussion about the edge effect of the detector was given too.

Angular distributions have been measured for the elastic and inelastic scattering and one-nucleon transfer of 88.0 MeV 16O on 116Sn. Coupled-channels calculations have been performed for the elastic and inelastic scattering, and DWBA treatment for one-proton stripping (16O, 15N), and one-neutron pickup (16O, 17O) reactions. The results compared with the previous 64 MeV ones show energy dependence in the optical potentials and also in the normalization factors with the spectroscopic factors preserving consistent in DWBA analysis, which might relate to the threshold anomaly phenomena.

The excitation functions of 12C elastic scattering for 31P (12C, 12C) reaction at the corresponding angles in the c.m. system equal to 158��, 132��, 128��, 120�� and 98�� in the energy region of 11.2-25.1 MeV had been measured. The experiment was performed at the HI-13 tandem accelerator, China Inst of Atomic Energy, Beijing, by using the Beijing Q3D magnetic spectrometer or semiconductor detector. The excitation functions of 12C elastic scattering from 31P were measured using 31P as a projectile. The energy region of 31P beam was 40-90 MeV, in steps of either 300 KeV or 1 MeV. Some resonance-like structures appear in the excitation function in sub-barrier region of energy in the c.m. system equal to 15.15, 14.18, 13.82, 13.50, 13.17, 12.17 and 11.46 MeV.

The resolution of position and energy of the detector and the particle identification of the detector were tested with the products of 197Au(12C,12C), 12C(12C, 12C) and 27Al(12C,X) reactions. The testing results showed that the position resolution of the first position detector is less than 2 mm. The resolution of energy loss detector, residual energy detector and total energy are 5.6%, 7.1%, and 3.7%, respectively. In the field setting for 13 ground state group, 13C, 12C as well as the other particles can be distinguished.

Angular distributions of elastic and inelastic scattering have been measured for152Sm+12C at 63.2 MeV and148Nd+16O at 90.9 MeV. An evident interference pattern in the inelastic scattering has been observed for the first time in a strong Coulomb coupling system.

The angular distribution for mutual excitation has been measured for 148Nd+20Ne scattering. The colliding system studied was chosen for its very strong Coulomb coupling. Mutual excitation as strong as the single excitation of 20Ne 2+ has been observed, which is much stronger than in previously measured cases. The angular distribution of the mutual excitation is not bell shaped and is similar to that of the Ne 2+ state. Coupled-channels calculations fail to reproduce the data.

The angular distribution for mutual excitation has been measured for Nd-148 + Ne-20 scattering. The colliding system studied was chosen for its very strong Coulomb coupling. Mutual excitation as strong as the single excitation of Ne-20 2+ has been observed, which is much stronger than in previously measured cases. The angular distribution of the mutual excitation is not bell shaped and is similar to that of the Ne 2+ state. Coupled-channels calculations fail to reproduce the data.

The generalized master equation method is used to construct an exciton model which distinguishes between neutrons and protons among the fast particles emitted. Exact solutions as well as detailed discussion of the emission rate, initial condition, etc. are given

The prediction that there might be shell effect in pre-equilibrium emission of (α, p) reaction is true. It seems that there is also shell effect in the change of the average value of the square of transition matrix element of two-body residual interaction with different target nuclei at the lower excitation energy.

Based on the Generalized Master Equation Model, the contribution of slow particle emission is considered in the present paper. In order to take account of the distinction between the emission of fast and of slow particles, two assumptions have been introduced:1) Only the direction of the emission of the fast particle is correlated with the incident direction, the direction of the emission of the slow particle is isotropic.2) The energy distribution of the slow particles in an exciton state corresponds to the Maxwell distribution. The calculated results fit the experimental data of (n, n′) and (α,P) reactions rather well even at backward angles.

The decay parameters of the angular distributions, the charge distributions, and the first and second moments of the charge distributions with variation of TKEL are deduced from the results of the measurement of projectile-like fragments produced by 80.6 MeV /sup 16/O on /sup 27/Al. The relaxation process of this reaction is analyzed, and the effects of the potential energy surface on the first and second moments of the charge distributions are discussed.