Production Of ～8Li Secondary Beam And Cross Section Of ～2H(～8Li, ～9Be)n Reaction

In a large variety of astrophysical objects,nuclear recactions play a pivotal role for both energy production and nuclearsynthesis. Reactions involving short-lived radioactive nuclear beams (RNB) are of particular interest in nuclear physics and nuclear astrophysics because they can involve unusual isospin,spin and energy transfer.The standard model (SM) is know to produce fairly good agreement with primordial abundances of nuclides up to mass 7 amu,and to produce very tiny abundances of elements heavier than those. The recently developed inhomogeneous models (IMs) predict considerably higher abundances for 7Li and heavier nuclides can be produced through some reactions those involve short-lived radioactivenuclides. Li(d,n) Be reaction is potentially important in determining the abundances of the light nuclides from the IMs,because it can bothproduce Be and destroy Li.This dissertation has two primary part,One part discussed the significance and produce of RNB,and introduced HI-13 Tandem accelerator of China Institute of Atomic Energy (CIAE).The other part introduced the production of 8Li secondary beamby the H( Li,Li) H reaction in inverse kinematics using the secondary beam line of the HI-13 tandem accelerator at CIAE. The purity of thecollimated Li beam was better than 88%,the intensity about 30 s pnA 7Li for 44MeV 7Li beam. Cross section of 2H(8Li,9Beas.)n reaction at Ecm=8.1 MeV measured by using this beam is 9.0 + 2.8 mb. And the astrophysical S factor was deduced to be 272 + 85 keV b. From this result we can get the conclusion that 8Li(d,n)9BeG s reactionis really a important path for destroying Li in primordial nucleosynthesis.This dissertation also introduced some information on the research of multi-section annular semiconductor detectors.