排序方式: 共有18条查询结果,搜索用时 31 毫秒
11.
Yu Ts Oganessian A. G. Demin M. Hussonnois S. P. Tretyakova Yu P. Kharitonov V. K. Utyonkov I. V. Shirokovsky O. Constantinescu H. Bruchertseifer Yu S. Korotkin 《Zeitschrift für Physik A Hadrons and Nuclei》1984,319(2):215-217
In bombarding209Bi and207, 208Pb targets by55Mn and58Fe ions the yields of “cold fusion” reactions have been determined using a sensitive technique for detectingT 1/2≧1 ms spontaneous fission and theα-decay of heavy actinide elements. It has been shown that theA = 263–265 isotopes of element 108, including the even-even isotope264108, undergo mainlyα-decay. The obtained results, together with the known data on the properties of the isotopes of elements 104 and 106, provide evidence for the enhanced stability of theZ=108 nuclei against spontaneous fission. 相似文献
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Verma Ashukumar Modi Krunal Dey Shuvankar Kongor Anita Panchal Manthan Vora Manoj Panjwani Falak Jain VK. 《Journal of fluorescence》2022,32(2):637-645
Journal of Fluorescence - Herein, a novel N-(4-(tert-butyl)-phenyl)-2-chloroacetamide functionalized thiacalix[4]arene architecture, viz TCAN2PA has been synthesized and the sensing behaviour... 相似文献
14.
A. G. Demin S. P. Tretyakova V. K. Utyonkov I. V. Shirokovsky 《Zeitschrift für Physik A Hadrons and Nuclei》1984,315(2):197-200
In54Cr ion bombardments of targets prepared from enriched lead isotopes the spontaneous fission probability for the isotopes of element 106 formed in the reactions Pb(54Cr, 1,2n)106 was investigated. The spontaneous fission half-life of the doubly-even isotope260106 has been shown to beT SF?5 ms. The half-lives of neighbouring oddmass isotopes have also been estimated:T SF(259106)?0.1 s andT SF(261106)?0.4 s. The results of the experiments are discussed in comparison with the latest theoretical calculations. 相似文献
15.
We report on the observation of the first decay event of the new nuclide 292116 produced in an experiment devoted to the synthesis of Z=116 nuclei in the 248Cm + 48Ca reaction. The implantation of a heavy recoil in the focal-plane detector was followed in 46.9 ms by an α particle with E α=10.56MeV. The energies and decay times of the descendant nuclei are in agreement with those observed in the decay chains of the even-even isotope 288114, previously produced in the 244Pu + 48Ca reaction. Thus, the first α decay should be attributed to the parent nuclide 292116 produced via the evaporation of four neutrons in the complete fusion of 248Cm and 48Ca. The experiment is in progress at Flerov Laboratory for Nuclear Reactions (FLNR, JINR, Dubna). 相似文献
16.
The growth morphology of crystals of zinc tris(thiourea) sulphate (ZTS) is investigated experimentally, and computed using
the Hartman-Perdok approach. Attachment energies of the observed habit faces are calculated for determining their relative
morphological importance. A computer code is developed for carrying out these calculations. A special procedure is adopted
for computing the cohesive energy of a slice of the structure parallel to any rational crystallographic plane. For estimating
the cohesive energies, formal charges on the experimentally determined atomic positions in the molecules of ZTS are calculated
by ab initio molecular-orbital computations, with wave functions obtained by the Hartree-Fock procedure. Fairly good agreement with the
observed crystal morphology is obtained for a model of growth mechanism in which ZTS is assumed to exist in solution sa szinc
tris(thiourea) ions and sulphate ions. 相似文献
17.
Yu. Ts. Oganessian V. K. Utyonkov Yu. V. Lobanov F. Sh. Abdullin A. N. Polyakov I. V. Shirokovsky Yu. S. Tsyganov G. G. Gulbekian S. L. Bogomolov B. N. Gikal A. N. Mezentsev S. Iliev V. G. Subbotin A. M. Sukhov O. V. Ivanov G. V. Buklanov K. Subotic M. G. Itkis K. J. Moody J. F. Wild N. J. Stoyer M. A. Stoyer R. W. Lougheed 《Physics of Atomic Nuclei》2000,63(10):1679-1687
This article reports the results of experiments aimed at producing hypothetical long-lived superheavy elements located near the spherical-shell closures with Z≥114 and N≥72. For the synthesis of superheavy nuclei, we used a combination of neutron-rich reaction partners, with a 244Pu target and a 48Ca projectile. The sensitivity of the present experiment exceeded by more than two orders of magnitude previous attempts at synthesizing superheavy nuclides in reactions of 48Ca projectiles with actinide targets. We observed new decay sequences of genetically linked alpha decays terminated by spontaneous fission. The high measured alpha-particle energies, together with the long decay times and spontaneous fission terminating the chains, offer evidence for the decay of nuclei with high atomic numbers. The decay properties of the synthesized nuclei are consistent with the consecutive alpha decays originating from the parent nuclides 288,289114, produced in the 3n-and 4n-evaporation channels with cross sections of about a picobarn. The present observations can be considered experimental evidence for the existence of the “island of stability” of superheavy elements and are discussed in terms of modern theoretical approaches. 相似文献
18.
The d + d, t + p and h + n relative wavefunctions and their asymptotic normalizations are considered in the framework of the generator coordinate method
(GCM) and compared with ATMS (amalgamation of two-body correlation into multiple scattering processes) method which used the
realistic Reid soft core interaction. The asymptotic normalization of relative wavefunctions provide various coupling constants,
the cluster probability amplitude (the so-called Z
1/2-factor) and matter RMS radii. These wavefunctions are also used to obtain 4He − d − d, 4He − t − p and 4He − h − n vertex functions in the virtual decay of 4He. The extrapolation of vertex functions for negative values of q
2 upto the corresponding poles provide the vertex constants which are comparable with other estimates. It is noticed that in
GCM the coupling constants C
2 for 4He − d − d vertex is less than 2 as has been obtained in the forward dispersion relation technique. 相似文献