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61.
62.
V. A. Rubchenya W. H. Trzaska J. Äystö A. A. Alexandrov I. D. Alkhazov K. -T. Brinkmann A. Evsenin S. V. Khlebnikov A. V. Kuznetsov V. G. Lyapin M. Mutterer Yu. E. Penionzhkevich O. I. Osetrov Z. Radivojevich Yu. G. Sobolev G. P. Tjurin D. N. Vakhtin 《Physics of Atomic Nuclei》2002,65(4):697-702
The results of experimental and theoretical studies of the double-differential proton and neutron spectra measured in coincidence with fission fragments in the deuteron-induced reaction on a 238U target at E d =65 MeV are presented. These spectra measured in the forward direction are analyzed in the plane-wave Born approximation by using the modified model of stripping into a continuum. The pre-neutron emission fission fragment mass distributions were measured for the (d, f), (d, pf), and (d, nf) reaction channels. The enhancement of highly asymmetric mass division in the (d, pf) channel for the low-energy part of the breakup proton spectrum was observed. The (d, pf) channel can be used to imitate the neutron-induced fission at intermediate energy. The fission characteristics were analyzed in the model taking into account nuclear friction and relevant fission modes. 相似文献
63.
An amperometric bioelectrode for primary alcohols based on the incorporation of yeasts into the carbon paste matrix is reported. The response is based on the activity of alcohol dehydrogenase in yeasts. The intimate contact between the biocatalytic and sensing sites results in short response times. The addition of a redox-mediating hexacyanoferrate (III) ion greatly facilitates the detection of the enzymatically produced NADH. The effects of operating potential, carbon paste composition, concentration of coenzyme or redox mediator and other parameters are explored for optimum analytical performance. The dynamic properties of this electrode are exploited for detection in flow-injection systems, with a detection limit of 2 × 10?6 M (9 ng) of ethanol. The relative standard deviation for repetitive injections of a 1× 10?3 M ethanol solution over a 100-min period is 2.8%. Applicability to alcoholic beverages is illustrated. The trend in sensitivity toward different alcohols is in agreement with the known biospecificity of yeast alcohol dehydrogenase. 相似文献
64.
A. S. Demyanova A. A. Ogloblin A. N. Danilov S. V. Dmitriev V. I. Starostin S. A. Goncharov T. L. Belyaeva V. Trzaska 《JETP Letters》2016,104(5):289-292
Experimental data on inelastic 9Be+α scattering induced by 90-MeV α particles are analyzed. The 2.78-MeV excited state is shown to have spin–parity of Iπ=1/2- in agreement with the existing data. For the 4.70-MeV excited state, it is impossible to make an unambiguous choice between the previous value Iπ = 3/2+, and the proposed new value Iπ = 1/2?. 相似文献
65.
A. S. Demyanova A. A. Ogloblin A. N. Danilov T. L. Belyaeva S. A. Goncharov W. Trzaska 《JETP Letters》2016,104(8):526-530
We demonstrate that the radii of excited nuclear states can be estimated using the (3He, t) charge-exchange reaction and relying on the modified diffraction model. The radius of the N excited state with an excitation energy of E*=2.73 MeV, which lies in a continuous spectrum, is determined. The radius of this state proves to be close to that of the mirror 3.09-MeV state of the 13С nucleus, which possesses a neutron halo but lies in a discrete spectrum. Thereby, we demonstrate that the 2.37-MeV state of the 13N nucleus has a proton halo. The analysis is based on published measurements of differential cross sections for relevant reactions. 相似文献
66.
A. N. Andreyev N. Bijnens T. Enqvist M. Huyse P. Kuusiniemi M. Leino W. H. Trzaska J. Uusitalo P. Van Duppen 《Zeitschrift für Physik A Hadrons and Nuclei》1997,358(1):63-68
The neutron-deficient 190Po and 189Bi isotopes have been produced in the 2n respectively p2n channels of the 48Ti +144 Sm reaction. Cross sections for different reaction channels are given. For 190Po, improved values of α-energy Eα = 7550(15) keV and half-life T1/2 = 1.9 ?0.4 +0.6 ms were measured. By using correlated α-decay chains an α-branching ratio of 0.50(25) was deduced for 186Pb. The reduced α-width systematic is extended for both of these isotopes, confirming a persistence of the saturation towards the lighter Po isotopes and the absence of any anomalies for the neutron-deficient Pb isotopes. For 189Bi improved values of Eα = 7300(15) keV and T1/2 = 4.8(5) ms were measured. 相似文献
67.
J. Uusitalo M. Leino R. G. Allatt T. Enqvist K. Eskola P. T. Greenlees S. Hurskanen A. Keenan H. Kettunen P. Kuusiniemi R. D. Page W. H. Trzaska 《Zeitschrift für Physik A Hadrons and Nuclei》1997,358(4):375-376
Neutron deficient mercury isotopes were produced in the reaction 36Ar + 144Sm using bombarding energies of 180–230 MeV. Fusion products were separated in-flight from the primary beam using a gas-filled recoil separator. An alpha line with the alpha particle energy and half-life of (7069±11) keV and (2.1 ?0.7 +1.8 ) ms, respectively, was assigned to the new mercury isotope 174Hg. 相似文献
68.
Performing numerous analyses of tire/road noise measurements on low-noise pavements during the last several years, the authors observed significant inhomogeneity of the wearing course in numerous cases, while similar problems were almost non-existent when dense pavements were measured. 相似文献
69.
This work deals with a construction of an implicit solvent model which can be used in molecular dynamics simulations of systems comprising colloid nanoparticles and carbon nanotubes. Such systems, due to finite sizes of both components, cannot be accurately approximated by a smaller slab geometry and thus represent a particularly difficult case in terms of computer simulations. Adsorption of large colloid nanoparticles on the surfaces of carbon nanotubes were studied and we determined the adsorption energy profiles of the nanoparticles on the carbon nanotubes surfaces. We also determined the adsorption isotherms which help to understand a preferred location of the nanoparticles on the nanotubes surfaces. 相似文献
70.
Gelling of alginates in the presence of divalent metal ions is accompanied by the formation of the junction zone, i.e., the region of the alginate chains aggregation. The structure of the junction zone results primarily from the nature of interaction between the ??dimers,?? created by two alginate chains connected via Ca2+ ions. We have applied the molecular dynamics technique, in combination with the GROMOS96 biomolecular force field to elucidate the structural features and the stability of such dimer?Cdimer complexes, where the alginate chains were represented by oligomers of ??-l-guluronate. The results indicate that only associations mediated by calcium ions and carboxylic groups are stable during simulations. Hydrogen bonding-type interactions are too weak to support the stability of complexes. The parallel arrangement of two dimers is the favorable one, due to their helical twists, which interfere with the formation of the fully ordered structure of the junction zone. 相似文献