共查询到20条相似文献,搜索用时 15 毫秒
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讨论了在费米子动力学对称模型中大形变区核转动惯量的变化机制.指出在无I1带和基带交叉的情况下,heritage混合本身也可以引起转动惯量的变化,但引起混合的相互作用形式是重要的,引入某种三体相互作用后能很好地解释实验事实. 相似文献
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The intensive studies of equilibrium processes in heavy-ion reaction
have produced a need for information on nuclear level densities at high
energies and spins. The Fermi gas level density is often used in
investigation of heavy-ion reaction studies. Some papers have claimed
that nuclear level densities might deviate substantially from the Fermi
gas predications at excitations related to heavy-ion reactions. The
formulae of calculation of the nuclear level density based on the theory of superconductivity are presented, special attention is paid to the dependence of the level density on the angular momentum. The spin-dependent nuclear level density is evaluated using the pairing interaction. The resulting level density for an average spin of 52 ħ is evaluated for
155Er and compared with experimental data. Excellent agreement between experiment and theory is obtained. 相似文献
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扭摆法是测量物体转动惯量的有效方法,减小误差是该实验的关键问题。本文分析了扭摆法测物体转动惯量时空气阻力引起的误差,并给出了加载重物之后扭转系数的变化及其对测量误差的影响。结果对测量精度的提高、实验方法选择和仪器研制等方面具有重要的实际意义。 相似文献
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References: 《理论物理通讯》2007,47(2):303-308
The level density parameter and the back shift energy E1 are determined for nuclei with A-values across the whole periodic table from fits to complete level schemes at low excitation energy near the neutron binding energies.We find that the energy back shift E1 shows complicated behavior and depends on the type of the nucleus,even-even,odd mass,and odd-odd.The spin cut-off factor has also been investigated for nuclei mentioned above.The results arecompared with the previous results and different experimental data on level densities. 相似文献
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转动惯量测量实验是大学物理实验中综合实验项目之一,目前高校工科物理实验常用三线摆法测量刚体的转动惯量,而转动惯量测试仪目前都无测量过程周期自检报错功能,为减少学生使用过程中出错概率,对仪器增加自检功能,提高测量准确度,同时为方便记录,增加了周期记忆功能。 相似文献
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In the frame of the Fermi dynamical symmetry model, the effect of band crossing modes on the variance of moment of inertia is discussed. It is shown that irrespective of the existence of I1-band, it is the I0-band crossing with the ground band that forms the first backbending. Without band crossing under the backbending, the heritage mixing itself can cause the variance of moment of inertia. The experimental data of well-deformed rare-earth nuclides can be well explained quantitatively with the model. 相似文献
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J. E. Hirsch 《Annalen der Physik》2019,531(10)
I discuss the process of magnetic field generation in rotating superconductors in simply connected and multiply connected geometries. In cooling a normal metal into the superconducting state while it is rotating, electrons slow down or speed up depending on the geometry and their location in the sample, apparently defying inertia. I argue that the conventional theory of superconductivity does not explain these processes. Instead, the theory of hole superconductivity does. Its predictions agree with experimental observations of Hendricks, King and Rohrschach for solid and hollow cylinders. 相似文献
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J.E. Hirsch 《Physics letters. A》2019,383(1):83-90
We find that the bulk moment of inertia per unit volume of a metal becoming superconducting increases by the amount , with the bare electron mass and the classical electron radius. This is because superfluid electrons acquire an intrinsic moment of inertia , with the London penetration depth. As a consequence, we predict that when a rotating long cylinder becomes superconducting its angular velocity does not change, contrary to the prediction of conventional BCS-London theory that it will rotate faster. We explain the dynamics of magnetic field generation when a rotating normal metal becomes superconducting. 相似文献
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The statistical properties of interacting fermions have been studied for various angular momentum with the inclusion of pairing interaction. The dependence of the critical temperature on angular momentum for several nuclei,have been studied. The yrast energy as a function of angular momentum for 28 Si and 24Mg nuclei have been calculated up to 60.0 MeV of excitation energy. The computed limiting angular momenta are compared with the experimental results for 26Al produced by 12C 14N reaction. The relevant nuclear level densities for non-zero angular momentum have been computed for 44Ti and l36Ba nuclei. The results are compared with their corresponding values obtained from the approximateformulas. 相似文献
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A.N. Behkami M. Gholami M. Kildir M. Soltani 《理论物理通讯》2006,46(3):514-520
The statistical properties of interacting fermions have been studied for various angular momentum with the inclusion of pairing interaction. The dependence of the critical temperature on angular momentum for several nuclei, have been studied. The yrast energy as a function of angular momentum for 28Si and 24 Mg nuclei have been calculated up to 60.0 MeV of excitation energy. The computed limiting angular momenta are compared with the experimental results for ^26Al produced by ^12C+ 14N reaction. The relevant nuclear level densities for non-zero angular momentum have been computed for ^44Ti and ^136 Ba nuclei. The results are compared with their corresponding values obtained from the approximate formulas. 相似文献