Zhang Huan-Qiao

Excitation Halo States of 12B

Angular distributions for the 11B(d,p)12B transfer reactions have been measured at Elab = 11.8 MeV. The asymptotic normalization coefficients (ANC) of the ground state, the second and third excitation states for 12B (11B+n) are extracted from the differential cross sections at three forward angles. With these ANCs, the root-mean-square radii are calculated for these three states. The results show that the second and third excitation states of 12B are neutron halo states.

Experimental Evidence of Two-Proton Emissions from 18Ne Excited State

Experiment 18Ne+ 197Au was performed in Heavy Ion Research Facility Radioactive Ion Beam Line at Lanzhou (RIBLL). The nuclear energy levels of 18Ne were built by complete kinematical reconstruction of the decay products and diproton decay were observed from 18Ne excited states. At 6.15 MeV, the experimental relative momentum and angular correlations of the emitted protons are given. The obvious enhancement at |qrel| = 23 MeV/c and θc.m. = 40° shows the experimental criterion of 2He cluster decay from 18Neq.

Fission-fragment angular distributions for the 19F + 208Pb near- and sub-barrier fusion-fission reaction☆

Abstract Fission cross sections and angular distributions have been measured for the 19 F + 208 Pb reaction at bombarding energies from 83 to 105 MeV. The fission excitation function is well reproduced on the basis of the coupled-channels theory. The fission-fragment angular distributions are calculated in terms of the transition-state theory, with the transmission coefficients extracted from the excitation function calculation. It is found that a discrepancy between the observations and the predictions in angular anisotropy of fission fragments exists at near- and sub-barrier energies, except for lower and higher energy regions where the discrepancy tends to disappear. Moreover, the anisotropies as a function of the center-of-mass energy show a shoulder around 82 MeV. Our results clearly indicate the considerable effects of the coupling on the sub-barrier fusion cross section and on the near-barrier compound-nucleus spin distribution, and confirm the prediction of an approximately constant value for the mean square spin of a compound nucleus produced in a far sub-barrier fusion reaction.

Experimental Study of Beta-Delayed Proton Emission of 36,37Ca

The investigation of beta-delayed proton decay mode has become a powerful probe to study the proton-rich nuclei and their nuclear structure. To study exotic nuclei with extremely low purity produced by the Radioactive Ion Beam Line in Lanzhou, we perform an experiment of beta-delayed proton emission of 36,37Ca under a high-intensity continuous-beam mode. Ions are implanted into a double-sided silicon strip detector, where the subsequent decays are correlated to the preceding implantations in time sequence. The energy spectra of delayed protons from 36,37Caβ decay, half-lives and decay branching ratios are measured. The experimental results confirm the previous literature data and some improved results are obtained as well, demonstrating the feasibility of our detection approach and the reliability of our data analysis procedure. This allows for the development of more powerful detection arrays and further research on nuclei closer to proton-drip line on the basis of present work.

Development of large-area quadrant silicon detector for charged particles *

The quadrant silicon detector, a kind of passivated implanted planar silicon detector with quadrant structure on the junction side, gained its wide application in charged particle detection. In this paper, the manufacturing procedure, performance test and results of the quadrant silicon detector developed recently at the China Institute of Atomic Energy are presented. The detector is about 300

Possible Experimental Evidence of a Moderate Proton Halo in29S

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Extraction of the rms Radii of 13C from Asymptotic Normalization Coefficients

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Study of fusion Q-value rule in sub-barrier fusion of heavy ions

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Breakup Effect of Weakly Bound Projectile on the Barrier distribution around Coulomb Barrier

48 mm

Optical Potential Parameters for Halo Nucleus System 6He+12C from Transfer Reaction 11B(7Li, 6He)12C

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