Study Of Kinematically Complete Measurement Experimental Method For ¹⁷C Quasi-Elastic Scattering And ¹⁴Be Coulomb Breakup

Since the mid-1980's,the production and utilization of radioactive beam have expanded the research of nuclei physics and nuclear astrophysics,from only carrying out the research of the nucleus near the stability line to that of drip line nuclei which is far from the stability line. Especially the research on the ¹⁴Be and ¹⁷C are the hot issues in recent years. Based on this background,this thesis focuses on the experimental of quasi-elastic scattering reaction of ¹⁷C, we use the code FRESECO to do the optical model calculation, to explain the reaction mechanism and to discovery the structure of ¹⁷C. At the same time, this thesis also pays attention to the Coulomb breakup reaction of Pb(¹⁴Be, 12Be2n)X, we study the experimental set to analysis its impact spectral method. The analysis includes complete invariant mass spectrum method, equivalent photon model method and dipole transition probability B?E1? spectroscopy method.Through the research process of simulation and analysis,the experimental set-up parameters and conditions are changed to study the effect of experimental parameters on the physical results of the analysis.The experiments of ¹⁷C on the C target quasi-elastic scattering was conduct in the Institute of Modern Physics, Radioactive Ion Beam Line in Lanzhou ?RIBLL? terminal.Using the ¹⁷C 46.2AMeV secondary beam to attack the C target, and there were three PPAC in the front of the target to reconstruct the particle track. After the target, there was a 527?m thick 16×16 double silicon strip detector and a set of 8 × 8 CsI?Tl?detector, to collect the paticle information which is produced by the reaction on the target. In the calibration process, the energy deposition of the particles on different position of was ensured substantially same. We have found a calibration method to calibrate the edges of the silicon detector, and finished the calibration work for the paticle energy divided event. For the CsI detector, we also used a calibration method for the edge of detector, complete all detectors calibration work. By particle track reconstruction and particle identification, we collect complete dynamic information.FRESCO program was used to analysis quasi-elastic scattering angular distribution of ¹⁷C data. Optical model and continuum-discretized coupled channel method were applied to observe the ¹⁷C + 12C elstic scattering angle distribution. That was proved the ¹⁷C has weakly bound characteristics, and it also has an exotic nuclear structure.Based on the research of ¹⁷C quasi-elastic scattering on light carbon target experimental, this thesis also takes a study of ¹⁴Be coulomb breakup reaction on the heavy Pb target. To accomplish this goal the Geant4 toolkit was exploited to achieve Pb(¹⁴Be, 12Be2n)X reaction, and its correctness was verified. The main parameters of the reaction in this process is derived from FRESCO three-body CDCC calculation.Two-body model ?12Be + dineutron? is applied to describe double neutron halo nucleus ¹⁴Be, and three-body CDCC calculation has been successfully utilized in the ¹⁴Be breakup reaction of on the Pb target. In this thesis, the theoretical calculation and simulation of Geant4 was combined to finish the kinetic calculation and complete measurement of ¹⁴Be. Common methods of spectrum analysis include the analysis of inelastic scattering angular distribution, the reconstruction of relative kinetic energy spectrum and B?E1? of spectrum. By observing and analyzing the results of the reconstruction it was found that the relative energy spectrum is very sensitive to the target thickness in the heavy target Coulomb excitation experiment. As for the detectors behind the target, the neutron wall substantially affects the uncertainty of the energy spectroscopy. Then, it was discussed how the angular acceptance and the incident energy influence the neutron wall efficiency. Which can be summarized as covering the greater angle the more reliable reconstruction results, the higher energy of the incident particle ¹⁴Be relative kinetic energy of each detection efficiency is also more stable. The corresponding results are also referential for Coulomb breakup research of other neutron halo nuclei.