Results 1 - 10 of 581
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[en] The ATDHFB theory was applied to study properties of collective quadrupole states in the 72–76Kr isotopes. The calculations were performed for SIII, Sly4 and SkP variants of the Skyrme interaction with a seniority, volume δ or surface δ pairing force. Obtained energies and B(E2) transition probabilities are in a reasonable agreement with experimental data, with exception of those of the SkP interaction. (author)
[en] Total beta decay energies have been determined for isotopes of alkali and alkaline-earth elements. After a brief description of the experimental technique and results of the measurements, the discussion concentrates on masses of Rb and Kr near N = Z and their relevance for the Wigner symmetry term in nuclear mass calculations
[en] The microscopic description of the quadrupole collective dynamics in even krypton isotopes is presented. A microscopic calculation of Bohr's collective Hamiltonian is used to describe the collective motion in 76Kr. A single-particle basis calculated in a deformed Woods-Saxon potential leads to the potential energy surface obtained by the Strutinsky renormalization procedure, and to the inertial functions determined in the cranking model approximation. The collective Schroedinger equation is solved numerically to analyse the low-energy, even parity states in 76Kr. A good agreement between experiment and theory is obtained without specifically adjusting any parameter in the model for this nucleus. Some results regarding statical and dynamical characteristics of sup(74,78,80)Kr isotopes are also presented. The asymmetric rotor model with admixture of two quasiparticles is used to describe the sup(66,68,70)Ge and the sup(64,66)Zn isotopes. The interplay of collective and single particle motions is further investigated by magnetic moment measurements using the method of integral angular correlations perturbed by recoil into gas. The results involve g-factor measurements for 166Ho, 68Ge, 64Zn, 66Zn and 68Ga nuclei. Finally, a discussion of further possible improvements and more general developments of the problems under investigation is given. (author)
[en] To determine which nuclei may exhibit shape isomerism, we use a well-benchmarked macroscopic-microscopic model to calculate potential-energy surfaces as functions of spheroidal (ε2), hexadecapole (ε4), and axial-asymmetry (γ) shape coordinates for 7206 nuclei from A=31 to A=290. We analyze these and identify the deformations and energies of all minima deeper than 0.2 MeV. These minima may correspond to characteristic experimentally observable shape-isomeric states. Shape isomers mainly occur in the A=80 region, the A=100 region, and in an extended region centered around 208Pb. We compare our model to experimental results for Kr isotopes. Moreover, in a plot versus N and Z we show for each of the 7206 nuclei the calculated number of minima. The results reveal one fairly unexplored region of shape isomerism, which is experimentally accessible, namely the region northeast of 82208Pb.
[en] The Kr and Xe isotope yields at the photofission of "2"3"2Th, "2"3"8U, "2"3"7Np, "2"4"4Pu, "2"4"3Am and "2"4"8Cm were tested for the isoscaling behavior. In contrast with obvious isoscaling in the case of Kr, in the case of Xe the interplay of the STI and STII fission modes, governed by N = 82 and N = 88 neutron shells, results in a rather complicated situation.
[ru]Выходы изотопов Kr и Xe в фотоделении "2"3"2Th, "2"3"8U, "2"3"7Np, "2"4"4Pu, "2"4"3Am и "2"4"8Cm были изследованы на изоскейлинговую зависимость. Показано наличие изоскейлинга в случае Kr. В случае Xe обнаружено влияние на изоскейлинг мод деления STI и STII, соответствующих нейтронным оболочкам N = 82 и N =88.
[en] This report describes experimental investigations of a method that uses continuous-wave (CW) lasers to ionize selected isotopes of krypton with high isotopic selectivity. The experiments show that the ionization rate is at least a factor of 100 lower than calculated with our model that has been described in a previous report. This discrepancy may be due to a much smaller excitation cross section that expected based on previous work and/or the aberrations in the ultraviolet beam used for the first step in the excitation. Additional problems with damage to mirrors, alignment instabilities, and manufacturers halting production of key products make this approach not worth further development at this time