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借助于准单能电子束,事先校正了β望远镜探测器的响应函数。利用该探测器测量了从在线同位素分离器(美国布洛克海汶实验室的 TRISTAN)引出的~(100)Sr及其衰变链的β谱。然后直接从测得的β谱提取出~(100)Sr的β衰变的强度函数.基于图解B-B模型计算了容许伽莫夫-泰勒型的~(100)Sr的β强度函数,其结果与实验值符合较好。 相似文献
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83Rb的低能低自旋部分通过83Sr的放射性衰变进行了研究. 建立了衰变纲图, 对一些能级基于新的log ft值和γ分支比给出了自旋-宇称指定. 为了对这个核的能级结构进行讨论,将投影壳模型应用到核83Rb, 对激发的正宇称晕带和负宇称基态带理论计算与实验结果进行了比较, 此模型能很好地再现实验结果. 此外,为了从定量的结果抽取出物理内涵,给出了计算的负宇称基态带的带图. 相似文献
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李明亮 朱胜江 J.H.Hamilton A.V.Ramayya J.K.Hwang 车兴来 禹英男 I.Y.Lee J.O.Rasmussen Y.X.Luo 《中国物理 C》2004,28(Z1)
通过对252Cf的自发裂变产生的瞬发γ谱的分析, 对丰中子核98Sr的集体转动带进行了研究. 扩展了建立在1838keV能级上的K=3的转动带. 新发现了一个建立在2535keV能级上的K=6的转动带. 通过分析, 这两个带的带头组态都是ν9/2[404]⊙ν3/2[411], 分别满足关系Ω= |Ω1-Ω2|和Ω= |Ω1+Ω2|. 用延迟符合方法测量, 我们得到K=3和K=6的两个带的半衰期分别是13±3ns和4.5±1.0ns. 相似文献
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本文用双核子机制及核矩阵元的有效算符理论讨论了在轻子数不守恒的0νββ衰变中的右手流. 从40Ca的0νββ衰变的实验寿命计算了右手流混合参量η, 及其和Majorana中微子质量mν之间的关系. 我们的计算给出: i)当|η|=0时, mν≤(18~23)eV;ii)当|η|≤(1.6~2)×10-5. 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
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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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本文利用复合粒子量子场论的微扰展开方法计算了双例外原子(π&;#177;μ?)的四体衰变的几率,并与自由μ衰变作了比较。 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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本文利用U(5)群代数对核分子12C+12C振转谱进行分类. 结果表明, 利用动力学对称性U(5) U(4) O(3)可以较好地描述12C+12C核分子振转能级的对称性质. 相似文献
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简要介绍了伴随β-衰变的γ射线强度归一化因子的计算方法,并以实例说明,还给出了有关的强度平衡自洽检验方法及其简要讨论. 相似文献
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π-核双电荷交换反应的强度与反应过程的两核子转移的核谱振幅直接联系着. 本文讨论了这类反应与它们的核谱因子的关系. 并以26Mg(π+, π-)26Si为例, 用两种核结构讨论了它的激发函数和微分截面. 我们所用的理论方法能够解释实验数据. 相似文献
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The basic process of an exotic decay mode namely β-delayed fission is simply introduced. The progress status of the study in the world is essentialized. The observation of β-delayed fission of 228Ac is reported. The radium was radiochemically separated from natural thorium. Thin Ra sources in which 228Ac was got through 228Ra →β-228Ac were prepared for observing fission fragments from β-delayed fission of 228Ac. They exposed to the mica fission track detectors, and measured by an HPGe γ-ray detector. The β-delayed fission events of 228Ac were observed and its β-delayed fission probability was found to be (5±2)×10-12. 相似文献
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WANG Xu-Dong XIE Yuan-Xiang XU Shu-Wei LI Zhan-Kui GUO Bin LENG Chang-Geng WANG Chun-Fang YU Yong 《中国物理C(英文版)》2002,26(8):797-802
By irradiation of an enriched target of 96Ru with 40Ca and using a helium-jet fast tape transport system in combination with X-γ and γ-γ coincidence measurements,the very neutron deficient isotope 133Sm was produced and studied. A simple(EC+β+) decay scheme of Sm is proposed for the first time. A by product 133Pr was produced simultaneously because of the 98-102Ru contents of the ruthenium target. The half-life of an 11/2- low-lying isomeric state in 133Pr has been measured to be (1.1±0.2)s. Using single-particle model,the reduced transition probabilities of the 11/2- isomers in 131,133,135,137Pr are extracted from their experimental half-lives and compared with the Weisskopf estimate. 相似文献
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本文应用复合粒子量子场论的微扰展开式和相对论性的(π&;#177;μ?)、(K&;#177;μ?)的B.S.波函数,计算了在原子核屏蔽库仑场中高能(π&;#177;μ?)、(K&;#177;μ?)原子的裂解能谱和截面。在极端相对论近似下,对大多数原子核,它们的裂解截面分别约为10-18cm2和10-17cm2。利用同样的波函数,还计算了(π&;#177;μ?)→π0+vμ(vμ),(K&;#177;μ?)→K0+vμ(vμ),以及(π&;#177;μ?)→μ++μ-+vμ(vμ),(K&;#177;μ?)→μ++μ-+vμ(vμ)的衰变几率。 相似文献