The Experts below are selected from a list of 168 Experts worldwide ranked by ideXlab platform

Siddhartha Sen - One of the best experts on this subject based on the ideXlab platform.

  • Simple phenomenology for the ground-state bands of Even-Even Nuclei.
    Physical review. C Nuclear physics, 1994
    Co-Authors: Maitreyee Saha Sarkar, Siddhartha Sen
    Abstract:

    It is observed that the Even-Even Nuclei having identical [ital N][sub [ital p]][ital N][sub [ital n]]/[Delta] values exhibit identical excitation energies and/or energy ratios ([ital E][sub [ital J]]/[ital E][sub 2],[ital E][sub [ital J]]/[ital E][sub 4]) in their ground-state bands (g.s.b.). [ital N][sub [ital p]] ([ital N][sub [ital n]]) is the valence proton (neutron) number and [Delta] is the average pairing gap, ([Delta][sub [ital p]]+[Delta][sub [ital n]])/2. It is shown that this correlation is a manifestation of a very simple but uniform dependence of the excitation energies of the g.s.b. of Even-Even Nuclei, spanning a wide mass region (70[le][ital A][le]244), on the ratio of their pairing and [ital n]-[ital p] interaction energies. An explicit form of this dependence is phenomenologically deduced and subsequently used to study the development of collectivity, existence of subshell closures and some other nuclear systematics.

  • Energy systematics of Even-Even Nuclei in the N p N n scheme
    Physical review. C Nuclear physics, 1994
    Co-Authors: M. Saha, Siddhartha Sen
    Abstract:

    It is shown that there exists a simple relationship between the ground band energies of Even-Even Nuclei spanning a wide region of mass ([ital A][congruent]76--254) and equilibrium shape, and their valence nucleon numbers ([ital N][sub [ital p]],[ital N][sub [ital n]]). This relationship enables us to deduce much useful information about the equilibrium shape of a particular nucleus just from the knowledge of its [ital E][sub 21][sup +] energy and to predict the excitation energies of Even-Even Nuclei belonging to this mass region with reasonable accuracy.

M. Ivascu - One of the best experts on this subject based on the ideXlab platform.

  • Band structure systematics and symmetries in Even-Even Nuclei
    Physical review. C Nuclear physics, 1993
    Co-Authors: D. Bucurescu, Gh. Cata-danil, M. Ivascu
    Abstract:

    It is shown that the experimental in-band energy ratios for the Even-Even Nuclei obey universal systematics similar to those observed by Mallmann for the quasiground band. Systematic correlations between energy ratios belonging to different bands are also found in certain cases. Finally, correlations between mixed energy ratios are shown to be useful in characterizing the evolution of the nulcear collectivity.

R.f. Casten - One of the best experts on this subject based on the ideXlab platform.

  • F-spin purity of 2{sub 1}{sup +} states in Even-Even Nuclei
    1993
    Co-Authors: A. || Wolf, Olaf Scholten, R.f. Casten
    Abstract:

    A procedure is proposed by which upper limits to the F-spin purity of 2{sub 1}{sup +} states in Even-Even Nuclei can be estimated by an analysis of experimental g-factors. The procedure, applied to 17 Nuclei with 46{le}Z{le}78, shows that F

  • F-spin purity of 2 +1 states in Even-Even Nuclei
    Physics Letters B, 1993
    Co-Authors: A. Wolf, Olaf Scholten, R.f. Casten
    Abstract:

    Abstract A procedure is proposed by which upper limits to the F -spin purity of 2 + 1 states in Even-Even Nuclei can be estimated by an analysis of experimental g -factors. The procedure, applied to 17 Nuclei with 46⩽ Z ⩽78, showed that F F max admixtures up to 10% are not uncommon. A systematic behavior with Z is observed. In the present approach, these admixtures account in part for the observed deviations of the boson g -factors g π and g ν from their “bare” values of 1 and 0.

Zhongzhou Ren - One of the best experts on this subject based on the ideXlab platform.

  • Competition between alpha- and beta(+)-decay modes for unstable Even-Even Nuclei
    Journal of Physics G: Nuclear and Particle Physics, 2014
    Co-Authors: Zhongzhou Ren, Xin Zhang
    Abstract:

    alpha-decay and beta-decay are two important decay modes involving different interactions and mechanisms in physics. The competition between alpha-and beta(+)-decay modes for unstable neutron-deficient Even-Even Nuclei is investigated. It is found that the alpha- and beta(+)-decay energies play an important role in their competition. An analytical relationship between the decay energies and branching ratios is presented, which is useful for experimentalists to estimate the main decay channel of unstable Nuclei before experiments. The calculated decay branching ratios agree with the experimental data for most Nuclei. Predictions of alpha-decay branching ratios of some unstable Even-Even Nuclei are also made for future experiments.

  • Systematics of fine structure in the α decay of deformed Even-Even Nuclei
    Journal of Physics: Conference Series, 2013
    Co-Authors: Zhongzhou Ren
    Abstract:

    We present detailed systematics of the results for α transitions to excited 2+, 4+, and 6+ states in the α decay of deformed Even-Even Nuclei. Both the semiclassical and coupled-channel results are analyzed in the valence nucleon scheme. This provides a good test of the reliability of the various theoretical models for the α-decay fine structure. It is found that the coupled-channel results agree well with the experimental data in both systematic behavior and magnitude, while the semiclassical results have relatively large deviations from the experimental data. This confirms the good reliability of the coupled-channel studies.

  • Relativistic mean-field study of even - even Nuclei near and
    Journal of Physics G: Nuclear and Particle Physics, 1996
    Co-Authors: Zhongzhou Ren, Zhi-yuan Zhu, Y.h. Cai
    Abstract:

    We have studied the ground state properties of even - even Nuclei with proton number Z = 106 - 114 and neutron number N = 160 - 170 in the framework of the nonlinear relativistic mean-field theory. Calculations show that there are prolate deformations in these Nuclei and this supports a deformed shape for Nuclei near N = 162 predicted by macroscopic models. The calculated binding energies and -decay energies agree very well with those from mass models.

D. Bucurescu - One of the best experts on this subject based on the ideXlab platform.

  • Band structure systematics and symmetries in Even-Even Nuclei
    Physical review. C Nuclear physics, 1993
    Co-Authors: D. Bucurescu, Gh. Cata-danil, M. Ivascu
    Abstract:

    It is shown that the experimental in-band energy ratios for the Even-Even Nuclei obey universal systematics similar to those observed by Mallmann for the quasiground band. Systematic correlations between energy ratios belonging to different bands are also found in certain cases. Finally, correlations between mixed energy ratios are shown to be useful in characterizing the evolution of the nulcear collectivity.