The separation and identification of isotopes emitted from the projectile fragmentation reaction of 80 MeV/u 20Ne on 9Be target were carried out by using the radioactive ion beam line in Lanzhou(RIBLL).Many proton ric...The separation and identification of isotopes emitted from the projectile fragmentation reaction of 80 MeV/u 20Ne on 9Be target were carried out by using the radioactive ion beam line in Lanzhou(RIBLL).Many proton rich isotopes are obtained.Their intensity and purity fit the theoretical calculations.Good separation and identification abilities of RIBLL A/ΔA>300 and Q/ΔQ>150,are obtained.展开更多
Measurements of total reaction cross sections(σR)for some proton-rich nuclei(N=11-15 isotones)on carbon target at intermediate energies have been performed on the Radioactive Ion Beam Line of the Heavy Ion Research F...Measurements of total reaction cross sections(σR)for some proton-rich nuclei(N=11-15 isotones)on carbon target at intermediate energies have been performed on the Radioactive Ion Beam Line of the Heavy Ion Research Facility in Lanzhou.A large enhancement ofσR for ^(27)P has been observed than for its neighbors.Evidence for a proton halo in ^(27)P has been revealed in the Glauber analysis of the total reaction cross sections in terms of the difference factor d.展开更多
Total reaction cross sections σR for some proton-rich isotones (N = 10) near ^(23)Al on a carbon target have been measured at intermediate energies in the experiment performed at the Radioactive Ion Beam Line of the ...Total reaction cross sections σR for some proton-rich isotones (N = 10) near ^(23)Al on a carbon target have been measured at intermediate energies in the experiment performed at the Radioactive Ion Beam Line of the Heavy Ion Research Facility in Lanzhou. The Z-dependence of σR shows a remarkable enhancement for ^(23)Al relative to its neighbours. The difference factor d has been deduced from the measured σR by using the Glauber or Boltzmann-Uehling-Uhlenbeck models. From the above analysis, a possible one-proton halo structure is suggested for ^(23)Al.展开更多
Fragments produced in the reactions of 69 MeV/nucleon ^(36)Ar and ^(55)MeV/nucleon ^(40)Ar on a Be target have been measured experimentally.The isotopic distributions from fragmentation reaction for both projectiles a...Fragments produced in the reactions of 69 MeV/nucleon ^(36)Ar and ^(55)MeV/nucleon ^(40)Ar on a Be target have been measured experimentally.The isotopic distributions from fragmentation reaction for both projectiles are reproduced by using a modified statistical abrasion-ablation model.Strong isospin effect exhibits in the isotopic distributions produced in ^(36)Ar and ^(40)Ar fragmentation.Experimental evidence is seen for the disappearance of the isospin effect in fragmentation reaction.展开更多
Measurements of the total reaction cross section for^(12-16)C,^(14-17)N and^(16-18)O on carbon target at intermediate energies were performed on RIBLL of HIRFL.A larger enhancement ofσR for^(15)C was observed than th...Measurements of the total reaction cross section for^(12-16)C,^(14-17)N and^(16-18)O on carbon target at intermediate energies were performed on RIBLL of HIRFL.A larger enhancement ofσR for^(15)C was observed than that for its neighbors.The analysis of these data indicates possible existence of an anomalous nuclear structure in^(15)C.A new quantity was suggested as the criterion to distinguish anomalous structure nuclei from normal nuclei.展开更多
Correlation measurements of neutrons and fragments have been performed in a reaction of 33.4MeV/u ^(17)N on a ^(9)Be target.Energy spectra of n and nitrogen fragments were obtained at different angles.Based on the nuc...Correlation measurements of neutrons and fragments have been performed in a reaction of 33.4MeV/u ^(17)N on a ^(9)Be target.Energy spectra of n and nitrogen fragments were obtained at different angles.Based on the nuclear diffraction dissociation model,the measured energy spectra and the neutron angular distributions were reproduced quite well assuming that ^(17)N was composed of ^(16)N and n or ^(15)N and 2n interacting with the nonlocal separable potential.The satisfactory agreement between the theoretical calculations and the experimental data shows that the contribution of Coulomb dissociation is negligible in the reaction concerned.展开更多
Fragments produced in the reaction of 60 MeV/n^(18)O on Be have been measured experimentally.The isotopic distribution of fragmentation reaction is well reproduced by a modified statistical abrasion-ablation model It ...Fragments produced in the reaction of 60 MeV/n^(18)O on Be have been measured experimentally.The isotopic distribution of fragmentation reaction is well reproduced by a modified statistical abrasion-ablation model It is predicted that the isotopic distribution shifts toward the neutron rich side for neutron rich projectile,but this isospin effect decreases with the increase of the atomic number difference Z-Z_(A)and disappears at last,where Z and Z_(A)are atomic numbers of the isotopic distribution and the projectile respectively.展开更多
The experimental measurement of the total interaction cross sections of N,C,B,and Be isotopes on 12C target at medium energies is described.A new formula that gives a good description of the energy-range relationship ...The experimental measurement of the total interaction cross sections of N,C,B,and Be isotopes on 12C target at medium energies is described.A new formula that gives a good description of the energy-range relationship of energetic ions over a wide energy range is presented.The energy calibration of detectors is made by a Monte Carlo simulation method based on this new formula.展开更多
基金Supported by the Chinese Academy of Sciencesthe National Committee of Science and Technology of China。
文摘The separation and identification of isotopes emitted from the projectile fragmentation reaction of 80 MeV/u 20Ne on 9Be target were carried out by using the radioactive ion beam line in Lanzhou(RIBLL).Many proton rich isotopes are obtained.Their intensity and purity fit the theoretical calculations.Good separation and identification abilities of RIBLL A/ΔA>300 and Q/ΔQ>150,are obtained.
基金Supported by the Major State Basic Research Development Program in China under Contract No.G200077400.
文摘Measurements of total reaction cross sections(σR)for some proton-rich nuclei(N=11-15 isotones)on carbon target at intermediate energies have been performed on the Radioactive Ion Beam Line of the Heavy Ion Research Facility in Lanzhou.A large enhancement ofσR for ^(27)P has been observed than for its neighbors.Evidence for a proton halo in ^(27)P has been revealed in the Glauber analysis of the total reaction cross sections in terms of the difference factor d.
基金Supported by the Major State Basic Research Development Program under contract No.G200077400。
文摘Total reaction cross sections σR for some proton-rich isotones (N = 10) near ^(23)Al on a carbon target have been measured at intermediate energies in the experiment performed at the Radioactive Ion Beam Line of the Heavy Ion Research Facility in Lanzhou. The Z-dependence of σR shows a remarkable enhancement for ^(23)Al relative to its neighbours. The difference factor d has been deduced from the measured σR by using the Glauber or Boltzmann-Uehling-Uhlenbeck models. From the above analysis, a possible one-proton halo structure is suggested for ^(23)Al.
基金Supported by the Major State Basic Research Development Program in China Under Contract No.G200077400.
文摘Fragments produced in the reactions of 69 MeV/nucleon ^(36)Ar and ^(55)MeV/nucleon ^(40)Ar on a Be target have been measured experimentally.The isotopic distributions from fragmentation reaction for both projectiles are reproduced by using a modified statistical abrasion-ablation model.Strong isospin effect exhibits in the isotopic distributions produced in ^(36)Ar and ^(40)Ar fragmentation.Experimental evidence is seen for the disappearance of the isospin effect in fragmentation reaction.
基金Supported by the National Natural Science Foundation of China for Distinguished Young Scholar under Grand No.19625513National Natural Science Foundation of China under Grant No.19675059+1 种基金Shanghai Science,Technology Development Fund under Grant No.96XD14011Major State Basic Research Development Program(G200077400).
文摘Measurements of the total reaction cross section for^(12-16)C,^(14-17)N and^(16-18)O on carbon target at intermediate energies were performed on RIBLL of HIRFL.A larger enhancement ofσR for^(15)C was observed than that for its neighbors.The analysis of these data indicates possible existence of an anomalous nuclear structure in^(15)C.A new quantity was suggested as the criterion to distinguish anomalous structure nuclei from normal nuclei.
基金Supported by the National Natural Science Foundation of China under Grant No.19575003。
文摘Correlation measurements of neutrons and fragments have been performed in a reaction of 33.4MeV/u ^(17)N on a ^(9)Be target.Energy spectra of n and nitrogen fragments were obtained at different angles.Based on the nuclear diffraction dissociation model,the measured energy spectra and the neutron angular distributions were reproduced quite well assuming that ^(17)N was composed of ^(16)N and n or ^(15)N and 2n interacting with the nonlocal separable potential.The satisfactory agreement between the theoretical calculations and the experimental data shows that the contribution of Coulomb dissociation is negligible in the reaction concerned.
基金Supported by the National Natural Science Foundation of China for Distinguished Young Scholar under Grand No.19625513National Natural Science Foundation of China under Grant No.19675059Shanghai Science and Technology Development Fund under Grant No.96XD14011.
文摘Fragments produced in the reaction of 60 MeV/n^(18)O on Be have been measured experimentally.The isotopic distribution of fragmentation reaction is well reproduced by a modified statistical abrasion-ablation model It is predicted that the isotopic distribution shifts toward the neutron rich side for neutron rich projectile,but this isospin effect decreases with the increase of the atomic number difference Z-Z_(A)and disappears at last,where Z and Z_(A)are atomic numbers of the isotopic distribution and the projectile respectively.
基金Supported by the National Science Foundation of China for Distinguished Young Scholar under Grand No.19625513.
文摘The experimental measurement of the total interaction cross sections of N,C,B,and Be isotopes on 12C target at medium energies is described.A new formula that gives a good description of the energy-range relationship of energetic ions over a wide energy range is presented.The energy calibration of detectors is made by a Monte Carlo simulation method based on this new formula.
