共查询到20条相似文献,搜索用时 46 毫秒
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本文简单介绍了首次成功地测定这两个衰变纲图的技术难点、实验过程、主要实验结果及物理意义。 EC/β+ decay schemes of 153Er and 157Yb are proposed for the first time. The related technical difficulty, experimental process, main results and their physics are representedbrigly. 相似文献
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本文简介绍了首次成功地测定这两个衰变纲图的技术难点,实验过程,主要实验结果表明物理意义。 相似文献
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甘再国 郭俊盛 吴晓蕾 范红梅 秦芝 雷祥国 董成富 徐华根 陈若富 张福明 郭斌 刘洪业 王华磊 谢成营 冯兆庆 郑勇 宋立涛 骆鹏 徐瑚珊 周小红 靳根明 任中洲 《原子核物理评论》2005,22(1):36-38
利用兰州重离子加速器提供的26Mg离子束轰击243Am靶, 产生了新同位素265Bh.实验中用氦喷技术对产物进行传输, 并用一套具有数对探测器组的转轮收集探测系统对产物进行收集和测量.通过观测265Bh与它的衰变子核261Db及257Lr之间的α衰变的关联, 实现了对新核素的鉴别.实验测得265Bh的α衰变能量为(9.24±0.05) MeV, 半衰期为0.94+0.70 -0.31 s. 相似文献
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用14MeV中子轰击钍靶,通过^232Th(n,α)^229Ra反应产季了^229Ra,由放射化学分离技术从被照靶物质中分离出^229Ra活性,利用γ(X)谱学方法,首次观测到了^229Ra的能量为14.5,15.6,18.8,21.8,22.5,44.0,47.5,55.0,63.0,69.6,93.6,94.1,98.5,102.2,104.5,106.1,161.1和171.5keV的18条 相似文献
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Zhang Xueqian Yuan Shuanggui Yang Weifan Mou Wantong Yu Xian Li Zongwei Guo Tianrui Du Yifei Luo Yixiao 《中国物理C(英文版)》1996,20(8):673-677
The 175Er activity was produced via the reaction 176Yb(n,2p) 175Er by 14MeV neutron irradiation of a natural ytterbium metal target with a thickness of~80mg/cm2.X-γ and γ-γ coincidence measurements were employed to identify 175Er activity.The half-life of 175Er has been determined to be (1.2±0.3)min. Eight new gamma rays were assigned to the decay of 175Er. A partial decay scheme of 175Er has been proposed for the first time, from which a ground rotational band has been assigned to 175Tm. 相似文献
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The mechanism of the formation of the band 2 in nuclei 156Er and 158Er has been discussed in the framwork of VMI model. 相似文献
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Rotational structures at ultrahigh spin in ^157,158,159 Er have been investigated with the configuration-dependent cranked Nilsson-Strutinsky approach. Configurations of observed bands are assigned and the corresponding deformations are given theoretically. The calculations suggest that one of ultrahigh spin bands in ^158 Er is triaxial highly deformed and the other is normal-deformed, while both ultrahigh spin bands in ^157Er are suggested to be triaxial highly deformed. The possible ultrahigh spin bands in ^159Er are predicted to be triaxial highly deformed and have shape coexistence in the same configuration. The configurations with two neutron holes in the Nose = 4 orbitals and two neutron holes in the h11/2 orbitals in ^159Er are favoured for ultrahigh spin states but unfavoured for band termination, which is similar to ultrahigh spin bands in ^157,15SEr. 相似文献
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ZHANG Li JIN Gen-Ming ZHAO Jin-Hua YANG Wei-Fan YANG Yong-Feng ZHAO Zhi-Zheng ZHENG Ji-Wen SUN Xiu-Rong LI Zong-Wei QIN Zhi WANG Ji-Cheng GUO Guang-Hui 《中国物理C(英文版)》1992,16(8):767-768
The new neutron-rich isotope 208Hg has been identified for the first time from the reaction products in fully-stopping thick nat.Pb target bombarded by 30MeV/u 12C beam provided by the Heavy Ion Research Facility in Lanzhou.Assignment of the nuclide 208Hg was based on the measurements of the deacy γ energy and halflife of its daughter 208Ti,which was grown up with 208Hg β-deacy.The half-life of 208Hg β-deacy was determined to be 42+23-12 min.The average production cross section of 208Hg over the incident energy region from Coulomb barrier to 30MeV/u is found to be 1.1±0.5μb. 相似文献
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He Jianjun Yang Weifan Yuan Shuanggui Ma Taotao Li Zongwei Xiong Bing Xu Yanbing 《中国物理C(英文版)》1999,23(11):1044-1048
Unreported heavy neutron-rich nuclide 238Th has been produced via a multinucleon transfer reaction by 60MeVIu 180 ions bombardment of natural uranium.Thorium was radiochemically separated from the mixture of uranium and reaction products. 238Pa as a daughter nucleus of 238Th has been identified according to the growth and decay of 238Pa γ rays which has been observed. The half-life of 238Th was determined to be (9.4 + 2.0) min. At the same time, a new γ ray of (89.0 + 0.3) keV with T1/2= (8.9 + 1.5)min was found in the γ spectrum gated with the Kα1, X ray of Pa and assigned to 238Th decay based on the measurements of its transition energy and the half-life.
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Xu Yanbing Yuan Shuanggui Yang Weifan He Jianjun Li Zongwei Ma Taotao Xiong Bing Qin Zhi Mou Wantong Gan Zaiguo Shi Lijun Guo Tianrui Chen Zhantu Guo Junsheng 《中国物理C(英文版)》1999,23(1):93-95
A new nuclide 238Th has been produced via multinucleon transfer reaction induced by 60MeV/u 18O ion irradiation of natural uranium. The thorium was radiochemically separated from the mixture of uranium and its reaction products. The activity of thorium was measured by using a HPGe detector and a planar HPGe detector. The 238Th has been identified for the first time by measuring the growth and decay of the γ-rays from its daughter 238Pa. The half-life of 238Th was determined to be (9.4±2.0)min. In addition,a new (89.0±0.3)keV γ-ray with T1/2=(8.9±1.5)min was observed and assigned to 238Th decay based on the measurement of transition energy and half life. 相似文献
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新丰中子同位素208Hg,首次从30MeV/u的12C束轰击厚的天然铅靶反应产物中被鉴定出来,208Hg的鉴别基于二步化学分离及γ活性分析,第一步,借助于在本工作中所发展起来的熔化靶装置和一种特殊的热色谱技术,实现了Hg元素产物高效、高选择性的分离,第二步则是周期性的提取随着收集样品中的丰中子Hg同位素的β—衰变而生长起来的Tl元素,在提取的Tl样品中,观察到能量为2614.6keV、半衰期为191±10~4 50s的γ活性,它只能被指定为208Hg的β—衰变子体208Tl,将测得的208Hg半衰期42±23 12min与理论预言进行了比较。 The new neutron-rich isotope 208Hg was identified for the first time from the reactionproducts in a thick natPb target bombarded by a 30MeV/u 12C beam. The identification of 208Hg wasbased on two-step chemical separation and γ activity analysis. The first step was the release,separation and collection of Hg element products with a high efficiency and good selectivity bymeans of a melt target device and a special thermochromatographic technique developed in presentwork. The second step was.. 相似文献
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A two-dimensional Total Routhian Surface(TRS) calculation is carried out in order to ascertain if there is triaxial superdeformation in 175Hf. A five quasi-particle configuration is chosen in the calculation. Unfortunately, the TRS minimum does not show up in the total potential energy surface. 相似文献
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Taking into account the pairing correlation plus the quadrupolequadrupole interaction,the intrinsic properties of the low-lying bands (even parity) and the related E2 transition probabilities in 168Er were calculated in the frame of Bohr-Mottelson-Nilsson model.The agreement between the calculated and the observed results is satisfactory.Some difficulties encountered in the IBM prediction do not appear in the present calculation. 相似文献