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Wenxue Huang Ruichang Ma Xiaoji Xu Junsheng Guo Shuwei Xu Xiangfu Sun Yuanxiang Xie Zhankui Li Genming Jin Yixiao Luo 《中国科学A辑(英文版)》2000,43(3):291-298
β-delayed proton decays of Tz = 1/2 series nuclei81Zr and85Mo have been studied in detail by using p-γ coincidence measurement. The β-delayed proton spectra populating the first excited
states of the daughter nuclei have been obtained. Half-life of81Zr has been measured tobe5.3s ± 0.5 s and that of85Mo 3.2 s ± 0.2 S. By using statistical model calculations and systematic analyses, spins and parities for the ground states
of81Zr and85Mo have been tentatively assigned to be 3/2− and 1/2−, respectively. Mass excess of81Zris -58.3 MeV± 0.2 MeV and that of85Mo-59.1 MeV ± 0.4 MeV. Combining the measured half-lives with the calculated partial ones yields the branches of β-de-layed
proton decay for81zr and85Mo of (1.2 ± 0.2) × 10-3 and (1.4 ± 0.2) × 10-3, respectively. 相似文献
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运用p-γ符合测量技术,详细研究了Tz=1/2系列核素81Zr和85Mo的β延迟质子衰变.获得了β衰变后发射质子布居到子核的第1激发态的质子谱.测量得81Zr的半衰期为(5.3±0.5) s,85Mo的半衰期为(3.2±0.2) s. 利用统计模型理论计算和实验值的比较以及系统性分析,暂时指定81Zr的基态自旋和宇称为3/2-,85Mo的基态自旋和宇称为1/2-. 81Zr的质量剩余为(-58.3±0.2) MeV, 85Mo的质量剩余为(-59.1±0.4) MeV. 结合实验测得的半衰期和理论计算所得的质子发射部分半衰期,得81Zr延迟发射质子的分支比为(1.2±0.2)×10-3,85Mo延迟发射质子的分支比为(1.4±0.2)×10-3. 相似文献
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藉助氦喷嘴带传输系统,采用“p-γ”符合的鉴别原理,成功地合成与鉴别了58Ni(36Ar, 2p3n)反应产生的核素89Ru,并研究了它的β缓发质子衰变性质.实验给出89Ru的衰变半衰期为(1.2±0.2)s, 测定了它的β缓发质子能谱,提取出了89Ru经缓发质子衰变布居到子核88Mo的2+和4+态的相对终态分支比(100∶6).通过与统计模型计算结果进行对比,初步指定了89Ru基态的自旋 宇称(5/2+或7/2±)和质量过剩(-59.5 MeV). 相似文献
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通过20Ne(p,n)20Na反应,对核天体物理反应中引人注意的20Na衰变作了较深入的研究。发现了20Na的1个新的β+延迟a衰变道,其a能量和相对强度分别为(5896±6)keV和(0.0024±0.0003)kev(以2150 kev a峰强度为100)。同时在实验上观察到了20Na β+延迟16O反冲,并由此推断出了β+延迟低能a衰变,a平均能量约为780kev,相对强度约为1.4。另外,还就此16O反冲和低能a衰变,讨论了低能带电粒子在物质中的能量损失规律。最后还对如何进一步甄别20Na β+延迟低能a衰变提出了新的探测方法。 相似文献
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通过重离子引起的核反应106Cd (40Ca, p3n)合成了新的β 缓发质子先驱核142Ho, 并且配合氦喷嘴快速带传输系统用“p-γ”符合方法对它进行了首次鉴别. 观测了142Ho的β 缓发质子衰变, 测定其半衰期为(0.4±0.1) s. 利用统计模型拟合实验估计的对质子女儿核141Tb中末态的相对分支比和缓发质子能谱, 142Ho的基态自旋被指认为5, 6或7. 用Woods-Xason Strutinsky方法计算了142Ho的核位能面, 其结果支持指认142Ho的基态自旋宇称为7-. 作为副产品, 还首次观测到了来自先驱核139Gd, 140Tb, 142Tb和143Dy的β 缓发质子衰变产生的质子女儿核中的一些γ 跃迁. 相似文献
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藉助氦喷嘴带传输系统,采用"p-γ"符合的鉴别原理,成功地合成与鉴别了58Ni(36Ar, 2p3n)反应产生的核素89Ru, 并研究了它的β缓发质子衰变性质.实验给出89Ru的衰变半衰期为(1.2±0.2) s, 测定了它的β缓发质子能谱,提取出了89Ru经缓发质子衰变布居到子核88Mo的2+和4+态的相对终态分支比(100∶6).通过与统计模型计算结果进行对比,初步指定了89Ru基态的自旋-宇称(5/2+或7/2±)和质量过剩(-59.5 MeV). 相似文献
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HUANG Wenxue MA Ruichang XU Xiaoji GUO Junsheng XU Shuwei SUN Xiangfu XIE Yuanxiang LI Zhankui JIN Genming LUO Yixiao 《中国科学A辑(英文版)》2000,43(3)
β-delayed proton decays of Tz=1/2 series nuclei 81Zr and 85Mo have been studied in detail by using p-γ coincidence measurement. The β-delayed proton spectra populating the first excited states of the daughter nuclei have been obtained. Half-life of 81Zr has been measured to be 5.3 s±0.5 s and that of 85Mo 3.2 s±0.2 s. By using statistical model calculations and systematic analyses, spins and parities for the ground states of 81Zr and 85Mo have been tentatively assigned to be 3/2- and 1/2-, respectively. Mass excess of 81Zr is -58.3 MeV±0.2 MeV and that of 85Mo -59.1 MeV±0.4 MeV. Combining the measured half-lives with the calculated partial ones yields the branches of β-delayed proton decay for 81Zr and 85Mo of (1.2±0.2)×10-3 and (1.4±0.2)×10-3, respectively. 相似文献
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Wenxue Huang Ruichang Ma Xiaoji Xu Junsheng Guo Shuwei Xu Xiangfu Sun Yuanxiang Xie Zhankui Li Genming Jin Yixiao Luo 《中国科学 数学(英文版)》2000,43(3):291-298
β-delayed proton decays of Tz = 1/2 series nuclei81Zr and85Mo have been studied in detail by using p-γ coincidence measurement. The β-delayed proton spectra populating the first excited states of the daughter nuclei have been obtained. Half-life of81Zr has been measured tobe5.3s ± 0.5 s and that of85Mo 3.2 s ± 0.2 S. By using statistical model calculations and systematic analyses, spins and parities for the ground states of81Zr and85Mo have been tentatively assigned to be 3/2? and 1/2?, respectively. Mass excess of81Zris -58.3 MeV± 0.2 MeV and that of85Mo-59.1 MeV ± 0.4 MeV. Combining the measured half-lives with the calculated partial ones yields the branches of β-de-layed proton decay for81zr and85Mo of (1.2 ± 0.2) × 10-3 and (1.4 ± 0.2) × 10-3, respectively. 相似文献
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基于对广义系统、泛导、泛对称、泛箱原理、泛系相对性提出了新的分析模式与新的相对数学化的简化强化的定义,发展了泛系方法论与泛系相对论的框架与理法,具体内容涉及相对普适的数学化的泛系,200类对偶,对偶转化,泛对称转化,泛系辩证,八畴方法,泛系数学方法,广义量化,逼近转化原则,泛等价定理,供求分析,思维实验,广义灰色系统,等等 相似文献
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论文利用极大刻画方法介绍了带一般参数的Hardy空间.作为特殊情况, 它们包含了经典Hp空间, Hardy-Lorentz 空间Hp,q和广义的Hardy-Lorentz空间Hp(φ). 相似文献
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对于质量介于 1 .2和 2 .9GeV之间的I =0 ,JPC等于偶++ 无味强子 ,基于粒子衰变到两个赝标介子的衰变宽度和各衰变道的分支比的普遍分析 ,给出判别这粒子是介子还是胶球的两组判别式 .判断已知的I=0 ,JPC=2 ++,f2 (1 5 2 5 )是一个典型的介子 .讨论了判断新的I=0 ,JPC等于偶++ 无味强子的方法 相似文献
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在一本初等数论的书上,我看到这样一个问题:判断6465+6564是素数还是合数?可以想象这是一个很大的数,需要比较巧的方法才能判定.书上是这样解答的:根据费马小定理,如果a和p互素,p是素数,则ap-1≡1(mod p). 相似文献
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We prove that if a symmetric submarkovian semigroup (T
t
)
t>0
satisfies an estimate of the form
where ϕ is an increasing C
1
-diffeomorphism of [0,+∞) with subexponential growth, then a suitable function of its infinitesimal generator is bounded from
L
p
(M) to L
q
(M) for 1<p<q<+∞, and that a weak converse holds true if p=2. In the special case where ϕ(t)=Ct
μ
for small t and ϕ(t)=C′ exp(ct
ν
) for large t, μ>0, c>0, 0<ν<1, one obtains a sharp and explicit result, which applies for instance to sublaplacians on solvable unimodular Lie
groups with exponential growth.
Received: 29 June 2001 /
Published online: 1 April 2003
Mathematics Subject Classifications (2000): 47D06, 58J35, 43A80
Research supported by the Italian M.U.R.S.T., fondi 60%, the Italian GNAFA, and the European Commission (European TMR Network
``Harmonic Analysis' 1998–2001, Contract ERBFMRX-CT97-0159). 相似文献
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本文用生成元、关系式构造了任意域K上扭Chevalley单群2B2(K)的泛中心扩张.(域K=GF(23)除外)当域K为GF(25)的代数扩域时,证明了2B2(K)的Schur乘子是平凡的. 相似文献