Exploring the limits of neutron binding in atomic nuclei remains a central focus of nuclear physics.However,the experimental determination of the neutron drip line is challenging because of the minuscule production cr...Exploring the limits of neutron binding in atomic nuclei remains a central focus of nuclear physics.However,the experimental determination of the neutron drip line is challenging because of the minuscule production cross sections of the most neutron-rich isotopes.We investigate the effectiveness of multi-step fragmentation for producing extremely neutron-rich nuclides at relativistic energies.We demonstrate that multi-step fragmentation dominates over single-step fragmentation in thick-target experiments and can enhance the yields of drip-line nuclei by several orders of magnitude in a realistic experiment using fragment separators.Such enhancements open new possibilities for locating the drip lines above sodium and thus significantly expand the research horizon.展开更多
The simulation results of MAT-261 type ion source and ion optics with the SIMION 3D 7.0 software were given. By means of simulation, the ion's trajectory was studied, the cause of low abundance sensitivity was ana...The simulation results of MAT-261 type ion source and ion optics with the SIMION 3D 7.0 software were given. By means of simulation, the ion's trajectory was studied, the cause of low abundance sensitivity was analyzed and the optimal poles' voltage ranges of the ion optics were found. Modifications were made to the LRIMS3000 type mass spectrometer according to result of the simulation. The abundance sensitivity of the mass spectrometer is improved to 2×10-6 from original 5×10-5.展开更多
基金supported by the National Natural Science Foundation of China(Nos.12325506,11961141004,12335009,12175009).
文摘Exploring the limits of neutron binding in atomic nuclei remains a central focus of nuclear physics.However,the experimental determination of the neutron drip line is challenging because of the minuscule production cross sections of the most neutron-rich isotopes.We investigate the effectiveness of multi-step fragmentation for producing extremely neutron-rich nuclides at relativistic energies.We demonstrate that multi-step fragmentation dominates over single-step fragmentation in thick-target experiments and can enhance the yields of drip-line nuclei by several orders of magnitude in a realistic experiment using fragment separators.Such enhancements open new possibilities for locating the drip lines above sodium and thus significantly expand the research horizon.
文摘The simulation results of MAT-261 type ion source and ion optics with the SIMION 3D 7.0 software were given. By means of simulation, the ion's trajectory was studied, the cause of low abundance sensitivity was analyzed and the optimal poles' voltage ranges of the ion optics were found. Modifications were made to the LRIMS3000 type mass spectrometer according to result of the simulation. The abundance sensitivity of the mass spectrometer is improved to 2×10-6 from original 5×10-5.
