Multi-nucleon transfer reaction plays an important role in the synthesis of new nuclides[1]. In the reactions of 20Ne+209Bi, some short-lived nuclei produced by transferring 26 nucleons were discovered. The experimen...Multi-nucleon transfer reaction plays an important role in the synthesis of new nuclides[1]. In the reactions of 20Ne+209Bi, some short-lived nuclei produced by transferring 26 nucleons were discovered. The experiment of 20Ne+209Bi was performed at gas-filled recoil separator in Lanzhou[2]. A 400 g/cm2 thick 209Bi target was bombarded with 20Ne beam delivered by accelerator HIRFL.展开更多
Multinucleon transfer processes in low-energy heavy ion collisions open a new field of research in nuclear physics, namely, production and studying properties of heavy neutron rich nuclei. This not-yet-explored area o...Multinucleon transfer processes in low-energy heavy ion collisions open a new field of research in nuclear physics, namely, production and studying properties of heavy neutron rich nuclei. This not-yet-explored area of the nuclear map is extremely important for understanding the astrophysical nucleosynthesis and the origin of heavy elements. Beams of very heavy U-like ions are needed to produce new long-living isotopes of transfermium and superheavy elements located very close to the island of stability. The calculated cross sections are high enough to perform the experiments at available accelerators.Beams of medium-mass ions(such as136 Xe,192Os,198Pt) can be used for the production of neutron rich nuclei located along the neutron closed shell N = 126(the last waiting point) having the largest impact on the astrophysical r-process. The Low-energy multinucleon transfer reactions is a very efficient tool also for the production and spectroscopic study of light exotic nuclei. The corresponding cross sections are 2 or 3 orders of magnitude larger as compared with high energy fragmentation reactions.展开更多
The study on the decay properties of new isotopes located far from the beta stability line is current the focus of nuclear physics. For isotopes in the region Z >82 and N <126, -emission prevails as radioactive ...The study on the decay properties of new isotopes located far from the beta stability line is current the focus of nuclear physics. For isotopes in the region Z >82 and N <126, -emission prevails as radioactive decay mode and -spectroscopy is the most important tool to obtain information on the nuclear structure. In the heavy nuclei region with N=124 and 126 isotones, an intruder state (h9=2.f7=2)8+ based on the attractive interaction of f7=2 protons and f5=2 neutrons has been significantly observed, which increases the binding energy of this configuration with increasing proton number.展开更多
Thick gold targets were bombarded with 47 MeV/nucleon C ions and the radioactive isotopes of iridium 12 and platinum were produced through the multi-nucleon transfer reactions. The production cross-sections of iridium...Thick gold targets were bombarded with 47 MeV/nucleon C ions and the radioactive isotopes of iridium 12 and platinum were produced through the multi-nucleon transfer reactions. The production cross-sections of iridium isotopes in the reactions have been determined by a combination of radiochemical separation and off-line γ-ray spec- troscopy technique. The obtained Ir isotope distribution was compared with those obtained in other experiment as well as calculated by the statistical model.展开更多
MeV/u 18O ions were used to bombard natural uranium targets, and the heavy neutron-rich isotope 237Th was produced via multi-nucleon transfer reaction and dissipative fragmentation of the heavy target. A relatively fa...MeV/u 18O ions were used to bombard natural uranium targets, and the heavy neutron-rich isotope 237Th was produced via multi-nucleon transfer reaction and dissipative fragmentation of the heavy target. A relatively fast radiochemical procedure was used to separate thorium from the mixture of uranium and complex reaction products. The chemically separated thorium fractions were studied by the 7-ray spectroscopic method. The behaviors of the growth and decay of 853.7 and 865.0 keV-γrays of 237Pa decay were observed. The half-life of 237Th was determined to be 4.69±0.60 nun.展开更多
The synthesis of superheavy nuclei remains a critical area of research in nuclear physics,with the aim of extending the periodic table and deepening our understanding of the properties of nuclei.This review provides a...The synthesis of superheavy nuclei remains a critical area of research in nuclear physics,with the aim of extending the periodic table and deepening our understanding of the properties of nuclei.This review provides a comprehensive overview of the latest advancements in superheavy nuclei synthesis,focusing on both the experimental and theoretical developments.We discuss the primary synthesis methods,including early fusion reactions with light nuclei,cold fusion reactions using lead and bismuth targets,and hot fusion reactions involving48Ca projectiles and actinide targets.In addition,we introduce the major experimental facilities and theoretical models currently employed worldwide.This review also summarizes the experimental plans and theoretical predictions for the synthesis of new superheavy elements.Furthermore,we discuss future directions,including the potential of employing heavier projectiles,radioactive beam-induced reactions,and multi-nucleon transfer reactions,which may offer new pathways for discovering unknown superheavy nuclei.展开更多
文摘Multi-nucleon transfer reaction plays an important role in the synthesis of new nuclides[1]. In the reactions of 20Ne+209Bi, some short-lived nuclei produced by transferring 26 nucleons were discovered. The experiment of 20Ne+209Bi was performed at gas-filled recoil separator in Lanzhou[2]. A 400 g/cm2 thick 209Bi target was bombarded with 20Ne beam delivered by accelerator HIRFL.
文摘Multinucleon transfer processes in low-energy heavy ion collisions open a new field of research in nuclear physics, namely, production and studying properties of heavy neutron rich nuclei. This not-yet-explored area of the nuclear map is extremely important for understanding the astrophysical nucleosynthesis and the origin of heavy elements. Beams of very heavy U-like ions are needed to produce new long-living isotopes of transfermium and superheavy elements located very close to the island of stability. The calculated cross sections are high enough to perform the experiments at available accelerators.Beams of medium-mass ions(such as136 Xe,192Os,198Pt) can be used for the production of neutron rich nuclei located along the neutron closed shell N = 126(the last waiting point) having the largest impact on the astrophysical r-process. The Low-energy multinucleon transfer reactions is a very efficient tool also for the production and spectroscopic study of light exotic nuclei. The corresponding cross sections are 2 or 3 orders of magnitude larger as compared with high energy fragmentation reactions.
文摘The study on the decay properties of new isotopes located far from the beta stability line is current the focus of nuclear physics. For isotopes in the region Z >82 and N <126, -emission prevails as radioactive decay mode and -spectroscopy is the most important tool to obtain information on the nuclear structure. In the heavy nuclei region with N=124 and 126 isotones, an intruder state (h9=2.f7=2)8+ based on the attractive interaction of f7=2 protons and f5=2 neutrons has been significantly observed, which increases the binding energy of this configuration with increasing proton number.
基金Supported by the National Natural Science Foundation of China (10075063) Major State Basic Research Development Program under Contract Number (G2000077400) and the Chinese Academy of Sciences.
文摘Thick gold targets were bombarded with 47 MeV/nucleon C ions and the radioactive isotopes of iridium 12 and platinum were produced through the multi-nucleon transfer reactions. The production cross-sections of iridium isotopes in the reactions have been determined by a combination of radiochemical separation and off-line γ-ray spec- troscopy technique. The obtained Ir isotope distribution was compared with those obtained in other experiment as well as calculated by the statistical model.
基金Supported by the National Natural Science Foundation of China (10075063), Major State Basic Research Development Program (G20000
文摘MeV/u 18O ions were used to bombard natural uranium targets, and the heavy neutron-rich isotope 237Th was produced via multi-nucleon transfer reaction and dissipative fragmentation of the heavy target. A relatively fast radiochemical procedure was used to separate thorium from the mixture of uranium and complex reaction products. The chemically separated thorium fractions were studied by the 7-ray spectroscopic method. The behaviors of the growth and decay of 853.7 and 865.0 keV-γrays of 237Pa decay were observed. The half-life of 237Th was determined to be 4.69±0.60 nun.
基金supported by the National Key R&D Program of China(No.2023YFA1606401)the National Key R&D Program of China(Nos.2023YFA1606500,2023YFA1606501,2023YFA1606504)+3 种基金the National Natural Science Foundation of China(Nos.12135004,11635003,11961141004,12375118,and 12435008)the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB34010000)the Major State Basic Research Development Program of China(2023YFA1606503)the CAS Strategic Priority Research Program(XDB34010000)。
文摘The synthesis of superheavy nuclei remains a critical area of research in nuclear physics,with the aim of extending the periodic table and deepening our understanding of the properties of nuclei.This review provides a comprehensive overview of the latest advancements in superheavy nuclei synthesis,focusing on both the experimental and theoretical developments.We discuss the primary synthesis methods,including early fusion reactions with light nuclei,cold fusion reactions using lead and bismuth targets,and hot fusion reactions involving48Ca projectiles and actinide targets.In addition,we introduce the major experimental facilities and theoretical models currently employed worldwide.This review also summarizes the experimental plans and theoretical predictions for the synthesis of new superheavy elements.Furthermore,we discuss future directions,including the potential of employing heavier projectiles,radioactive beam-induced reactions,and multi-nucleon transfer reactions,which may offer new pathways for discovering unknown superheavy nuclei.
