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1.
This presented study is to make comparison of cross sections to produce 117Sb and 90Nb via different reactions with particle incident energy up to 70 MeV as a part of systematic studies on particle-induced activations on enriched Sn, Y2O3 and ZrO2 targets, theoretical calculation of production yield, calculation of required thickness of target and suggestion of optimum reaction to produce Antimony-117 and Niobium-90. 相似文献
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The simultaneous analysis of nuclear relaxation behaviour of 119Sn-1H and 117Sn-1H dipolar vectors from the proton spinlattice relaxation rates of the relative satellite peaks may yield a very accurate calculation of correlation times. The dipolar interaction between the proton and the bound tin nucleus is differently observed on the 119Sn and 117Sn satellite resonances in the 1H partially relaxed spectra. Provided that the internuclear proton - tin distance is known, from the difference of the relaxation rate of the lH-118Sn signal with those measured from its satellite peaks, the correlation time can be calculated from the two independent set of data. 相似文献
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R. A. Mironov M. O. Zabezhailov I. F. Georgiu V. V. Cherepanov M. Yu. Rusin 《Optics and Spectroscopy》2018,124(3):289-297
A technique is proposed for determining the pore-size distribution based on measuring the dependence of total reflectance in the domain of partial transparency of a material. An assumption about equality of scattering-coefficient spectra determined by solving the inverse radiation transfer problem and by theoretical calculation with the Mie theory is used. The technique is applied to studying a quartz ceramics. The poresize distribution is also determined using mercury and gas porosimetry. All three methods are shown to produce close results for pores with diameters of <180 nm, which occupy ~90% of the void volume. In the domain of pore dimensions of >180 nm, the methods show differences that might be related to both specific procedural features and the structural properties of ceramics. The spectral-scattering method has a number of advantages over traditional porosimetry, and it can be viewed as a routine industrial technique. 相似文献
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G. Gegenbauer H. Krüger O. Lutz A. Nolle A. Schwenk A. Uhl 《Zeitschrift für Physik A Hadrons and Nuclei》1974,270(3):255-257
The ratios of the gI-factors of115Sn,117Sn and119Sn have been measured by the NMR method in different solutions which have large chemical shifts. No primary isotopic effect on the magnetic shielding was found within the error of 7·10?7. Therefore the ratios have been used for the calculation of the hyperfine structure anomalies in the3P1,3P2 and1D2 atomic states of the given tin isotopes. 相似文献
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用0.5mol.L-1的FeCl3溶液作引发剂,采用原位化学聚合法将吡咯单体聚合在Nafion117膜基体中。复合膜的红外光谱图中出现明显聚吡咯(PPy)的特征吸收峰,说明吡咯单体聚合在Nafion117膜中。机械性能测试表明复合膜的拉伸强度比Nafion117膜提高了。热重测试表明复合膜具有更高的热稳定性能。对复合膜进行了甲醇渗透性能的测试,结果表明复合膜具有明显的阻醇作用,PPy/NF-3膜的甲醇渗透率值是5.9×10^-7cm^2.s^-1,和Nafion117膜相比降低了53%。 相似文献
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The decay of 2.4 h117g Cd and 3.4 h117m Cd has been investigated with the use of high-resolution Si(Li) and Ge(Li) detectors, also in an anti-Compton arrangement. Spectra from the two isomers have been resolved by comparing young reactor-produced117Cd with aged cyclotron-produced117Cd. Ge(Li)-Ge(Li) coincidences have been measured with a multi-parameter analyzer. A hundred observedγ-rays are placed in a level scheme of117In. Possible theoretical interpretations are discussed. The I.T. Branching of117In is (47.1±1.5)%. Only about 1% of 11/2? 117m Cd decays to 1.93 h 1/2? 117m In and 10.9% of 1/2+ 117g Cd decays to the 9/2+ 117g In ground state bypassing the isomeric In state. 相似文献
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The case when an arbitrary number of photons moving in parallel coalesce to a single photon at an electron is considered for the first time. The calculation is based on the plane-wave-approximation model, describing the interaction between the quantum field of a plane electromagnetic wave and an electron. All the matrix elements determining the differential probability of the process are accurately calculated. As an illustration, results are given for the coalescence of three photons to one at an electron.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 117–124, December, 1978. 相似文献
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A robust method for the determination of carbon dioxide in sugar containing solutions using a single distributed feedback
quantum cascade laser (QCL) has been developed. By switching the driving current between two selected values, 1.6 and 1 A,
emission wavelengths at 2341.4 and 2341.6 cm-1 could be achieved.
The method is based on absorbance measurements in transmission and the calculation of the absorbance differences between both
wavenumbers. This allows the elimination of indirect matrix interference produced on carbon dioxide measurements with increasing
sugar concentrations. A flow injection setup was employed to produce carbon dioxide standards from a series of bicarbonate
solutions (0–3 g/l) by adjusting the pH with a sodium hydroxide/citric acid buffer solution to pH 3.13. Different concentrations
(0–90 g/l) of sugar were also mixed on line with the analyte to study their influence on carbon dioxide measurement. As the
difference in the two evaluated wavelengths is small compared to the absorption peak of CO2, the analytical readout of the QCL modulation can be seen as a proportional parameter to the first derivative of FTIR spectra
in this spectral region.
PACS 42.55.Px; 42.62.Fi 相似文献
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We report on the first genuinely three-body K[over]NN- piSigmaN coupled-channel Faddeev calculation in search for quasibound states in the K- pp system. The main absorptivity in the K- p subsystem is accounted for by fitting to K- p data near threshold. Our calculation yields one such quasibound state, with I=1/2, J{pi}=0-, bound in the range B approximately 55-70 MeV, with a width of Gamma approximately 90-110 MeV. These results differ substantially from previous estimates, and are at odds with the K- pp-->Lambda p signal observed by the FINUDA collaboration. 相似文献
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Utilizing the cross sections for 93Nb(n, 2n)93mNb or 27Al(n, a)24Na reactions as monitors, the cross sections for the reactions 115Sn(n, p)115mIn, 116Sn(n, p)116mIn, 117Sn(n, p)117In and 117Sn(n, p)117mIn have been measured at neutron energy ranging from 13.5 to 14.6 MeV through activation technology. Then, the results of present work were compared with the published experimental data. 相似文献
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《理论物理通讯》2016,(12)
We present an analysis of the xF_3(x,Q~2) structure function and Gross-Llewellyn Smith(GLS) sum rule taking into account the nuclear effects and higher twist correction. This analysis is based on the results presented in[N.M. Nath, et al., Indian J. Phys. 90(2016) 117]. The corrections due to nuclear effects predicted in several earlier analysis are incorporated to our results of xF_3(x,Q~2) structure function and GLS sum rule for free nucleon, corrected upto next-next-to-leading order(NNLO) perturbative order and calculate the nuclear structure function as well as sum rule for nuclei. In addition, by means of a simple model we have extracted the higher twist contributions to the nonsinglet structure function xF_3(x,Q~2) and GLS sum rule in NNLO perturbative orders and then incorporated them to our results. Our NNLO results along with nuclear effect and higher twist corrections are observed to be compatible with corresponding experimental data and other phenomenological analysis. 相似文献
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C. E. Aalseth F. T. Avignone III R. L. Brodzinski S. Cebrian D. Gonzáles E. García W. K. Hensley I. G. Irastorza I. V. Kirpichnikov A. A. Klimenko H. S. Miley A. Morales J. Morales A. Órtiz de Solórzano S. B. Osetrov V. S. Pogosov J. Puimedón J. H. Reeves M. L. Sarsa S. Scopel A. A. Smolnikov A. S. Starostin A. G. Tamanyan A. A. Vasenko S. I. Vasiliev J. A. Villar 《Physics of Atomic Nuclei》2000,63(7):1225-1228
The International Germanium Experiment (IGEX) has now analyzed 117 mol yr of data from its isotopically enriched (86% 76Ge) germanium detectors. Applying pulse shape discrimination (PSD) to the more recent data, the lower bound on the half-life for neutrinoless double-beta decay of 76Ge is deduced: T 1/2(0ν)>1.57×1025 yr (90% C.L.). This corresponds to an upper bound on the Majorana neutrino mass parameter, 〈m ν〉, between 0.33 eV and 1.35 eV depending on the choice of theoretical nuclear matrix elements used in the analysis. 相似文献
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We present the results of a calculation and experiment which show that rotation of He II in packed powder will not produce a decrease in temperature greater than 2 × 10-5 ° K. This is in contrast to a recent prediction. 相似文献
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Utilizing the cross sections for <'93>Nb(n, 2n)<'93m>Nb or <'27>Al(n, a)<'24>Na reactions as monitors, the cross sections for the reactions <'115>Sn(n, p)<'115m>In, <'116>Sn(n, p)<'116m>In, <'117m>Sn(n, p)<'117>In and <'117>Sn(n, p)<'117m>In have been measured at neutron energy ranging from 13.5 to 14.6 MeV through activation technology. Then, the results of present work were compared with the published experimental data. 相似文献
18.
M R Bendall T E Skinner 《Journal of magnetic resonance (San Diego, Calif. : 1997)》1999,139(1):175-180
Exact solutions for the effect of time-independent RF pulses on any initial configuration of an IS J-coupled system demonstrate that on-resonance CW decoupling yields signals whose frequency depends on RF field strength and homogeneity. These signals are enhanced starting with "undetectable" antiphase and multiple quantum coherences, which can also produce centerband intensity to mimic the signal from decoupled Sx. Conversely, these coherences can be generated from Sx using a low-power pulse, B1 = J/2, of length (2J)-1, dubbed a "90J pulse" since it is the selective equivalent of {(2J)-1-90[I]}. Utilizing 90J pulses, new characterization-of-decoupler (COD) pulse sequences can determine the performance of an insensitive I-spin channel by observing large signals from either antiphase or multiple quantum coherences with the S-spin channel, allowing, in minutes rather than hours: (i) frequency calibration to an accuracy of 0.1 Hz; (ii) measurement of RF amplitudes over a 500-fold variation; and (iii) mapping of RF homogeneity along the sample axis with a single 1D B1 spectrum. These 90J coherence transfer pulses are of potential general use for selective spectroscopy. 相似文献
19.
彩色珍珠致色成分的拉曼光谱研究 总被引:1,自引:0,他引:1
对多种彩色珍珠样品进行了可见光光谱和拉曼光谱测试,研究了珍珠致色成分的种类及其与颜色的关系。研究结果表明:(1) 彩色淡水珍珠和海水珍珠样品均会在1 121~1 132和1 506~1 524 cm-1范围出现强峰,该特征峰归属于多烯化合物的C—C和CC伸缩振动;(2) 随着珍珠颜色的加深,样品位于1 117~1 132,1 502~1 524和2 000~3 500 cm-1范围的峰逐渐增强,特征峰所代表的有机质与珍珠颜色有关;(3) 深紫色淡水珍珠和深橘红色海水珍珠样品在1 475~1 575 cm-1范围的包络峰可分成8~10个次级峰,计算可知多烯化合物CC双键数目分别为N=9~27和N=7~27。珍珠中不同种类和含量的多烯化合物,可能是彩色珍珠的致色原因。 相似文献
20.
We present an analysis of the xF3(x,Q2) structure function and Gross-Llewellyn Smith(GLS) sum rule taking into account the nuclear effects and higher twist correction. This analysis is based on the results presented in[N.M. Nath, et al., Indian J. Phys. 90 (2016) 117]. The corrections due to nuclear effects predicted in several earlier analysis are incorporated to our results of xF3(x,Q2) structure function and GLS sum rule for free nucleon, corrected upto next-next-to-leading order (NNLO) perturbative order and calculate the nuclear structure function as well as sum rule for nuclei. In addition, by means of a simple model we have extracted the higher twist contributions to the non-singlet structure function xF3(x,Q2) and GLS sum rule in NNLO perturbative orders and then incorporated them to our results. Our NNLO results along with nuclear effect and higher twist corrections are observed to be compatible with corresponding experimental data and other phenomenological analysis. 相似文献