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THE MEASUREMENT OF THE EXCITATION FUNCTIONS OF ISOTOPES OF Fr AND At,PRODUCED IN THE BOMBARDMENT OF 12C ON 209Bi
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Excitation functions for Fr and At isotopes produced in 12C on 209Bi had been measured in the energy range 60—72 MeV. It was quite obvious that 213Fr and 214Fr were formed by the reactions 209Bi (12C,4n) 217Ac and 209Bi (12C,3n) 218Ac following the a decay of the Ac isotopes respectively, and 214mFr was produced probably by compound nucleus evaporation of neutrons and an α particle, i.e. (12C, α 3n). 211At was mainly contributed by a multi-nucleon transfer reaction (e.g. 8Be transfer). The experimental data for neutron evaporation reaction were fitted by the Jackson formula. 相似文献
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133Sm was produced via fusion evaporation in the reaction 40Ca+96Ru. Its β-delayed proton decay was studied by means of “p-γ” coincidence in combination with a He-jet tape transport system, including half-lives, proton energy spectra, γ-transitions following the proton emissions, and the branching ratios to the low-lying states in the grand-daughter nuclei. The possible spins and parities of 133Sm were extracted by fitting the experimental data with a statistical model calculation. The configuration-constrained nuclear potential energy surfaces of 133Sm were calculated by using the Woods-Saxon Strutinsky method. Comparing the experimental and calculated results, the spins and parities of 133Sm were assigned to be 5/2+ and 1/2-, which is reconciled with our published simple (EC+β+) decay scheme of 133Sm in 2001. In addition, our experimental data on the beta-delayed proton decay of 149Yb reported in Eur. Phys. J., 2001, A12: 1—4 was also analyzed by using the same method. The spin and parity of 149Yb was assigned to be 1/2-. 相似文献
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YUAN Shuang-Gui ZHANG Tian-Mei PAN Qiang-Yan ZHANG Xue-Qian XU Shu-Wei 《中国物理C(英文版)》1992,16(8):765-766
New neutron-rich nuclide 185Hf has been identified for the first time.The 185Hf was produced via the 186W(n,2p)185Hf reaction by 14MeV neutron irradiation of natural metallic tungsten powder and separated by radiochemical methods.The identification of 185Hf was based on the observation of decay γ-ray of its daughter 185Ta.A half-life of 3.5±0.6min was determined for 185Hf by fitting the measured growth and decay curve of the 177.59keV γ-ray which is the strongest decay γ-ray of 185Ta.In addition,a new γ-ray of 164.5±0.5keV was found and assigned to 185Hf. 相似文献
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XIE YuanXiang XU ShuWei Li ZhanKui YU Yong PAN QiangYan WANG ChunFang ZHANG TianMei LONG GuiLu LI YanSong 《中国物理C(英文版)》2000,24(8):719-724
130Pm and 128 Pr were produced by irradiation of 96Ru with 171MeV 36Ar beam,and a He-jet recoil tape transport system transported radioactivities to shielded reigon. Based on X-γ-t and γ-γ-t coincidence measurements ,the (EC+β+)decay scheme of 130Pm was proposed for the first time and the (EC+β+)decay scheme of 128Pr was revised. 相似文献
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GAO Bing-Shui ZHOU Xiao-Hong FANG Yong-De ZHANG Yu-Hu LIU Min-Liang WANG Si-Cheng WANG Jian-Guo MA Fei GUO Ying-Xiang WU Xiao-Guang HE Chuang-Ye ZHENG Yun WANG Zhi-Min YAN Xin-Liang WANG Zhi-Gang FANG Fang 《中国物理C(英文版)》2014,38(6):064001-064001
The neutron rich nucleus 193Os was produced in the 192Os(7Li, 6Li)193Os reaction. An isomeric state based on the 9/2-[505] Nilsson orbital was identified in the present work. The half-life of the isomeric state was extracted and discussed in terms of the K quantum number. A level scheme built on the isomeric state was proposed based on the experimental data. 相似文献
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Xie Yuanxiang Xu Shuwei Li Zhankui Yu Yong Pan Qiangyan Wang Chunfang Zhang Tianmei Long Guilu Li Yansong 《The European Physical Journal A - Hadrons and Nuclei》1999,5(4):341-343
130Pm and 128Pr were produced by irradiation of 96Ru with 36Ar, and studied using a He-jet recoil tape transport system. Based on X-% and %-% coincidence measurements, the (EC+ # +) decay scheme of 130Pm was proposed for the first time and the (EC+ # +) decay scheme of 128Pr was revised. 相似文献
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GAN Zai-Guo FAN Hong-Mei QIN Zhi WU Xiao-Lei GUO Jun-Sheng LEI Xiang-Guo DONG Cheng-Fu XU Hua-Gen CHEN Ruo-Fu ZHANG Fu-Ming GUO Bin LIU Hong-Ye WANG Hua-Lei 《中国物理C(英文版)》2004,28(4):332-334
New isotope 265Bh(Z=107) was produced in bombardment of an 243Am target with 135MeV 26Mg ions at HIRFL. Identification was made by observation of correlated α particle decays between the new isotope 265Bh and its 261Db and 257Lr daughters with four pairs of detectors. A total of 8 correlated decay events of 265Bh and 4 decay events of 264Bh were identified. 265Bh decays with a 0.94+0.70-0.31s half-life by emission of α particle with an average energy of (9.24±0.05)MeV. 相似文献
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YU Yong XIE Yuan-Xiang XU Shu-Wei LI Zhan-Kui PAN Qiang-Yan WANG Chun-Fang XING Jian-Ping ZHANG Tian-Mei 《中国物理C(英文版)》2001,25(2):108-114
Isotopes,130Nd and 140Tb were produced using enriched targets 96Ru and 106Cd, respectively,bombarded by 36Ar ion beam. The two nuclides were identified and studied by a He-jet tape transport system in combination with "X-γ" and "γ-γ" coincidence measure- ments. The half-life of 130Nd was determined to be (13±2)s. The EC/β+ decay scheme of 130Nd was proposed for the first time, and the spins and parties of the ground-state and observed low-lying states in the daughter nucleus 130Pr were speculated tentatively. The previous simple EC/β+ decay scheme of 140Tb was revised, and the spin-parity of its groundstate was assigned to be 7+. 相似文献