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Arzhannikov, A.V.; Sinitskij, S.L.; Yalovets, A.P.

AN SSSR, Novosibirsk (Russian Federation). Inst. Yadernoj Fiziki1991

AN SSSR, Novosibirsk (Russian Federation). Inst. Yadernoj Fiziki1991

AbstractAbstract

[en] Methods of computerized solution of the problem of 10-100 keV energy electron passage through matter are developed. This may form the basis of theoretical description of rather complex physical phenomena involving participation of such electrons. Validity of accepted approach to solution of the problem and correctness of used physical formulas and numerical factors are verified by comparison of test calculations with experimental results described in publications. 35 refs.; 6 figs

Original Title

Reshenie zadachi o prokhozhdenii cherez veshchestvo ehlektronov srednikh ehnergij

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1991; 34 p

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Smirnov, I.B.

AN SSSR, Leningrad (Russian Federation). Inst. Yadernoj Fiziki1991

AN SSSR, Leningrad (Russian Federation). Inst. Yadernoj Fiziki1991

AbstractAbstract

[en] The ionization loss of the fast heavy charged particles in matter is discussed. More exact formula for the cross section of energy loss is suggested. Statistical properties of the distribution of ionization loss in thin and very thin layers of matter allow to calculate the distribution function and to model corresponding random number with large accuracy and a very small expenditure of computer time. The results of calculations correspond to experimental data. 12 refs., 2 figs., 1 tab

Original Title

Raschet fluktuatsij ionizatsionnykh poter' bystrykh tyazhelykh zaryazhennykh chastits

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1991; 17 p

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[en] If a fermion is travelling through a medium, it can have matter-induced magnetic and electric dipole moments. These contributions conserve chirality, and can be nonvanishing even for a Majorana neutrino. Several implications for neutrino physics are discussed

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Mar 1993; 4 p; CONTRACT FG03-93ER40757; OSTI as DE93013141; NTIS; INIS; US Govt. Printing Office Dep

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AbstractAbstract

[en] In the EGS4 code, too small or large step sizes violate the limits of the electron multiple scattering theory used. The limits are stricter with decreasing the electron energy so that the relation of the step size and the multiple scattering theory in the low energy region was examined with PRESTA. Energy deposition in water irradiated by electron beams of 30 to 200 keV was calculated. The parameters chosen to change the step sizes were the geometric mesh width, ESTEPE, and AE. Too small mesh width and ESTEPE turned off the multiple scattering simulation, which resulted in widely different curves from those with the full simulation of the multiple scattering. For large AE, the energy deposition obtained became zero at the shallower depth than the electron range since the energy straggling for the electrons of the energy below 2AE is not considered in the EGS4. (author)

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Hirayama, Hideo; Namito, Yoshihito; Ban, Syuichi (eds.); National Lab. for High Energy Physics, Tsukuba, Ibaraki (Japan); 132 p; Nov 1995; p. 1-8; 5. EGS4 users' meeting in Japan; Tsukuba, Ibaraki (Japan); 23-25 Jul 1995

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Report

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Conference; Numerical Data

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AbstractAbstract

[en] In the course of providing numerical benchmarks to the nuclear and medical industries, it is desirable to continually obtain solutions that use the available computational facilities to the greatest possible extent. Analytical benchmarks are generally simple problems, yet they provide numerical results that are numerically accurate to a desired error. Greater accuracy can be obtained at the expense of computational time. The simplest types of problems are usually those that evaluate the scalar flux, and the simplest geometry is an infinite homogeneous medium. However, depending on the source configuration, the scalar flux in an infinite medium can have spatial variation in one, two, or three dimensions. This paper shows how a three-dimensional problem can be generated by considering two-dimensional finite disk and rectangular sources

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Winter meeting of the American Nuclear Society (ANS); San Francisco, CA (United States); 29 Oct - 1 Nov 1995; CONF-951006--

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AbstractAbstract

[en] By using the characteristic X-ray sources and the Si(Li) detector system, the X-ray mass attenuation coefficients for Si, Fe, Cu, Y, In, Sn and SiH

_{4}have been systematically measured in the energy range of 1.486∼29.109 keV. The accuracy of experimental data has been reduced to +-1%Primary Subject

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Journal Article

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Nuclear Physics Review; ISSN 1007-4627; ; v. 14(3); p. 148-150

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[en] I present a new analytic solution to the integro-differential equation that describes the underground propagation of cosmic ray muons. The exact solution is given in the form of an infinite series in inverse powers of the muon energy. Convergence is proved for sufficiently high energies. The series is shown to be summable in closed form, in certain approximations. The closed forms provides analytic continuations to low energies of the series solution. One approximation resembles a well-known solution that ignores discrete energy loss, but this approximation introduces additional constants. I apply the approximate solution using an expression for the surface muon flux, derived from the primary flux, as a boundary condition. The result predicts the underground muon vertical intensity over seven orders of magnitude (10 km depth), compares favorably with published Monte Carlo calculations, and can be performed in seconds on a personal computer. As an application, the same approximation predicts the ''catastrophic'' energy-loss event rate at Soudan II. (orig.)

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25 refs.

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Journal Article

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Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment; ISSN 0168-9002; ; CODEN NIMAER; v. 399(2-3); p. 285-300

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Ahuja, B.L.; Kothari, R.K.; Pandya, R.K.; Sharma, B.K.; Cooper, M.J.

Proceedings of the DAE solid state physics symposium. V. 37C1994

Proceedings of the DAE solid state physics symposium. V. 37C1994

AbstractAbstract

[en] Short communication. 1 ref., 1 fig

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Department of Atomic Energy, Bombay (India). Board of Research in Nuclear Sciences; 617 p; 1994; p. 109; Department of Atomic Energy; Mumbai (India); 37. DAE solid state physics symposium; Jaipur (India); 27-31 Dec 1994

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Book

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Conference

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ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, AMERICIUM ISOTOPES, BASIC INTERACTIONS, ELASTIC SCATTERING, ELECTROMAGNETIC INTERACTIONS, ELECTROMAGNETIC RADIATION, ELEMENTS, HEAVY NUCLEI, INTERACTIONS, IONIZING RADIATIONS, ISOTOPES, METALS, NUCLEI, ODD-EVEN NUCLEI, RADIATIONS, RADIOISOTOPES, SCATTERING, SPONTANEOUS FISSION RADIOISOTOPES, TRANSITION ELEMENTS, YEARS LIVING RADIOISOTOPES

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AbstractAbstract

[en] The incoherent scattering function S for photons was calculated in the relativistic treatment of Ribberfors and Berggren, using Dirac-Hartree-Fock relativistic wavefunctions. Tables of S, for Z = 1--110, are presented on a momentum transfer mesh identical to previous nonrelativistic calculations. S has been calculated at a representative scattering angle of θ = 60 degree and energies compatible with the presentation mesh. For other scattering angles, the values presented in the tables are accurate to within 1--2% for momentum transfers larger than 0.1 angstrom

^{-1}. In the region below 0.1 angstrom^{-1}the accuracy worsens with decreasing momentum transfer, reaching 6% at 0.01 angstrom^{-1}and 10% at 0.005 angstrom^{-1}Primary Subject

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Numerical Data

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[en] The Fokker-Planck equation describing a beam of charged particles entering a homogeneous medium is solved here for a stationary case. Interactions are taken into account through Coulomb cross-section. Starting from the charged-particle distribution as a function of velocity and penetration depth, some important kinetic quantities are calculated, like mean velocity, range and the loss of energy per unit space. In such quantities the energy straggling is taken into account. This phenomenon is not considered in the continuous slowing-down approximation that is commonly used to obtain the range and the stopping power. Finally the well-know Bohr of Bethe formula is found as a first-order approximation of the Fokker-Planck equation

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