The production mechanism of heavy neutronrich nuclei is investigated by using the multinucleon transfer reactions of ^(136;148)Xe+^(208)Pb and ^(238)U+^(208)Pb in the framework of a dinuclear system model. The evapora...The production mechanism of heavy neutronrich nuclei is investigated by using the multinucleon transfer reactions of ^(136;148)Xe+^(208)Pb and ^(238)U+^(208)Pb in the framework of a dinuclear system model. The evaporation residual cross sections of target-like fragments are studied with the reaction system ^(148)Xe+^(208)Pb at near barrier energies. The results show that the final isotopic production cross sections in the neutron-deficient side are very sensitive to incident energy while it is not sensitive in the neutron-rich side. Comparing the isotopic production cross sections for the reactions of ^(208)Pb bombarded with stable and radioactive projectiles, we find that neutron-rich radioactive beams can significantly increase the production cross sections of heavy neutron-rich nuclei.展开更多
The complete and incomplete fusion cross section as well as one-neutron stripping process of ^(6)Li+^(94)Zr system were measured at the energies around the Coulomb barrier by onlineγ-ray method.In addition to a 30%su...The complete and incomplete fusion cross section as well as one-neutron stripping process of ^(6)Li+^(94)Zr system were measured at the energies around the Coulomb barrier by onlineγ-ray method.In addition to a 30%suppression factor when compared with the measured total fusion process,the complete fusion cross section in ^(6)Li+^(94)Zr system was observed to be significantly lower than those in the nearby ^(6)Li+^(90,96)Zr system.The new experimental result implies that the coupling with breakup channel in the ^(6)Li-induced fusion processes can be affected by the inner structure of the target,which is still not clear in any available model calculation.For the one-neutron stripping process,the direct production cross sections for each level in 95Zr were extracted and compared with the coupled reaction channel calculation,offering a unique opportunity to examine the single-particle nature of the produced excited states.Given the fact that an overall overestimation of the production cross section for 954-keV and1618-keV levels was observed in the comparison,further investigation is highly demanded in order to understand the full reaction mechanism for the one-neutron stripping process induced by ^(6)Li.展开更多
The main progresses in the multinucleon transfer reactions at energies close to the Coulomb barrier are reviewed. After a short presentation of the experimental progress and theoretical progress, the predicted product...The main progresses in the multinucleon transfer reactions at energies close to the Coulomb barrier are reviewed. After a short presentation of the experimental progress and theoretical progress, the predicted production cross sections for unknown neutron-rich heavy nuclei and the trans-uranium nuclei are presented.展开更多
The nuclear drip line corresponds to zero binding for protons and neutrons,defining the boundary of nuclide landscape.Beyond the drip lines,nuclei become unbound,in respect to nucleon emission.Nuclei located closest t...The nuclear drip line corresponds to zero binding for protons and neutrons,defining the boundary of nuclide landscape.Beyond the drip lines,nuclei become unbound,in respect to nucleon emission.Nuclei located closest to the drip line,which are commonly referred to as drip line nuclei,may exhibit phenomena untypical for tightly bound nuclei in the valley of stability.展开更多
基金supported by the National Natural Science Foundation of China under Grants Nos.11635003,11025524 and 11161130520the National Basic Research Program of China under Grant No.2010CB832903+1 种基金the European Commission’s 7th Framework Programme(Fp7-PEOPLE-2010-IRSES)under Grant Agreement Project No.269131the Project funded by China Postdoctoral Science Foundation(Grant No.2016M600956)
文摘The production mechanism of heavy neutronrich nuclei is investigated by using the multinucleon transfer reactions of ^(136;148)Xe+^(208)Pb and ^(238)U+^(208)Pb in the framework of a dinuclear system model. The evaporation residual cross sections of target-like fragments are studied with the reaction system ^(148)Xe+^(208)Pb at near barrier energies. The results show that the final isotopic production cross sections in the neutron-deficient side are very sensitive to incident energy while it is not sensitive in the neutron-rich side. Comparing the isotopic production cross sections for the reactions of ^(208)Pb bombarded with stable and radioactive projectiles, we find that neutron-rich radioactive beams can significantly increase the production cross sections of heavy neutron-rich nuclei.
基金supported by the National Nature Science Foundation of China(U2167204,11975040,1832130,12375130)the Director's Foundation of Department of Nuclear Physics,China Institute of Atomic Energy 12SZJJ-202305+4 种基金the partial support from financial agencies FAPERJ,CNPq,and INTC-FNA(Instituto Nacional de Ciência e Tecnologia-Física Nuclear e Aplica??es),research Project(464898/2014-5)supported by Guang dong Key Research And Development Program(2020B040420005)Guang dong Basic and Applied Basic Research Foundation(2021B1515120027)Ling Chuang Research Project of China National Nuclear Corporation(20221024000072F6-0002-7)Nuclear Energy Development and Research Project(HNKF202224(28))。
文摘The complete and incomplete fusion cross section as well as one-neutron stripping process of ^(6)Li+^(94)Zr system were measured at the energies around the Coulomb barrier by onlineγ-ray method.In addition to a 30%suppression factor when compared with the measured total fusion process,the complete fusion cross section in ^(6)Li+^(94)Zr system was observed to be significantly lower than those in the nearby ^(6)Li+^(90,96)Zr system.The new experimental result implies that the coupling with breakup channel in the ^(6)Li-induced fusion processes can be affected by the inner structure of the target,which is still not clear in any available model calculation.For the one-neutron stripping process,the direct production cross sections for each level in 95Zr were extracted and compared with the coupled reaction channel calculation,offering a unique opportunity to examine the single-particle nature of the produced excited states.Given the fact that an overall overestimation of the production cross section for 954-keV and1618-keV levels was observed in the comparison,further investigation is highly demanded in order to understand the full reaction mechanism for the one-neutron stripping process induced by ^(6)Li.
文摘The main progresses in the multinucleon transfer reactions at energies close to the Coulomb barrier are reviewed. After a short presentation of the experimental progress and theoretical progress, the predicted production cross sections for unknown neutron-rich heavy nuclei and the trans-uranium nuclei are presented.
基金supported by the National Key R&D Program of China(2022YFA1602302 and 2018YFA0404404)the National Natural Science Foundation of China(U2167204,12175314,12235020,U1732145,11705285,U1867212,11805280,and 11961131012)+2 种基金the Continuous Basic Scientific Research Project(WDJC-2019-13)the Leading Innovation Project(LC192209000701 and LC202309000201)the Basic Scientific Research Program(JCKY2020201C002)。
文摘The nuclear drip line corresponds to zero binding for protons and neutrons,defining the boundary of nuclide landscape.Beyond the drip lines,nuclei become unbound,in respect to nucleon emission.Nuclei located closest to the drip line,which are commonly referred to as drip line nuclei,may exhibit phenomena untypical for tightly bound nuclei in the valley of stability.
