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AbstractAbstract
[en] The evolution of outgoing quarks and gluons into outgoing hadrons (the analog of parton decay functions) is studied in QCD perturbation theory. The results are characterized by logarithmic scaling violations and large transverse momenta. The various functions describing the production of hadrons containing a single heavy quark are calculated from first principles. (Auth.)
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Record Type
Journal Article
Journal
Nucl. Phys., B; ISSN 0029-5582;
; v. 136(3); p. 445-460

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[en] Different asymmetries in polarized lepton scattering are shown to be remarkably dependent on the valence quark and lepton multiplet structure in currently discussed gauge theories. Therefore deep inelastic muon experiments at SPS energies can contribute significantly to the investigation of neutral currents. (Auth.)
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Journal Article
Journal
Phys. Lett., B; ISSN 0031-9163;
; v. 76(1); p. 79-82

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ALGEBRAIC CURRENTS, COMPOSITE MODELS, CURRENTS, FIELD THEORIES, FUNCTIONS, INELASTIC SCATTERING, INTERACTIONS, LEPTON-BARYON INTERACTIONS, LEPTON-HADRON INTERACTIONS, LEPTON-NUCLEON INTERACTIONS, LIE GROUPS, MATHEMATICAL MODELS, NEUTRAL CURRENTS, PARTICLE INTERACTIONS, PARTICLE MODELS, PARTICLE PROPERTIES, QUANTUM FIELD THEORY, SCATTERING, SU GROUPS, SYMMETRY GROUPS, U GROUPS
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AbstractAbstract
[en] Axions are here defined as possible new elementary particles of mass less than or comparable to electrons. It is stated that if they really exist their discovery would be a major scientific advance. The facts and the motivation underlying the recent search for these conjectured new particles are outlined in this review. 27 references. (Author)
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Journal Article
Journal
Nature (London); ISSN 0028-0836;
; v. 274(5666); p. 22-25

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AbstractAbstract
[en] A strong negative transverse polarization Psub(z) is found for forward produced lambdas observed in 10 and 16 GeV/c K-p interactions. This indicates that exchange of natural spin-parity are dominant in the production process. Using the polarization results, the dsigma/du' distribution for natural and unnatural spin-parity exchanges are derived. For unnatural exchanges, a dip is observed at u' approximately equal to 0.3 GeV2, which can be explained as a nonsense-wrong-signature zero of the Nsub(β) trajectory. The value of Psub(z) for forward produced lambdas is constant with energy. This is in agreement with the triple-Regge model prediction, as is the fact that Psub(z) is constant as a function of M2/s. The two non-transverse polarization components, Psub(x) and Psub(y), have been measured and are found to be consistent with zero for all x values, unlike Psub(z). (Auth.)
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Record Type
Journal Article
Journal
Nucl. Phys., B; ISSN 0029-5582;
; v. 136(3); p. 386-400

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ANGULAR MOMENTUM, BARYONS, ELEMENTARY PARTICLES, ENERGY RANGE, FERMIONS, GEV RANGE, HADRON-HADRON INTERACTIONS, HADRONS, HYPERONS, INTERACTIONS, KAON-NUCLEON INTERACTIONS, KAON-PROTON INTERACTIONS, MESON-BARYON INTERACTIONS, MESON-NUCLEON INTERACTIONS, ORIENTATION, PARTICLE INTERACTIONS, PARTICLE PROPERTIES, STRANGE PARTICLES
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AbstractAbstract
[en] Energy spectra at 900 are plotted for fragments produced in the 2.1 GeV interaction of protons with carbon and for the 4.9 GeV p + U and p + Al reactions
Primary Subject
Source
Conzett, H.E.; Heckman, H.H.; Myers, W.D. (eds.); California Univ., Berkeley (USA). Lawrence Berkeley Lab; p. 201-203; 1975; p. 201-203
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Report
Literature Type
Progress Report
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Evaluation of the effect of errors in group constants on calculations of neutron fields in shielding
Germogenova, T.A.; Suvorov, A.P.; Utkin, V.A.
Differential and integral nuclear data requirements for shielding calculations
Differential and integral nuclear data requirements for shielding calculations
AbstractAbstract
[en] Analytical expressions for the asymptotic neutron flux sensitivity function in an infinite homogeneous medium (plate geometry, isotopic scattering) to the neutron cross-section uncertainties were derived for the one-dimensional problem of neutron propagation in a shield. The results were compared with calculations performed by the discrete ordinate code ROZ-5. Investigation of the sensitivity function for Fe-H2O two-layer shields was made for the multigroup problem. Accuracy of neutron flux calculation results behind the shield was estimated. (author)
Primary Subject
Source
International Atomic Energy Agency, Vienna (Austria); Nuclear Energy Agency, 75 - Paris (France); p. 563-572; 1978; p. 563-572; Specialists' meeting on differential and integral nuclear data requirements for shielding calculations; Vienna, Austria; 12 - 15 Oct 1976
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Report
Literature Type
Conference
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AbstractAbstract
No abstract available
Original Title
Prokhozhdenie gamma-izlucheniya po izognutym kanalam v radiatsionnoj zashchite
Primary Subject
Source
Deposited article; for English translation see the journal Sov. At. Energy.
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Journal Article
Journal
Atomnaya Ehnergiya; v. 44(6); p. 514
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AbstractAbstract
[en] Upper and lower bounds on the ground-state energy per nucleon Esub(g)/N and the free energy per nucleon F(β)/N are constructed for nuclear systems described by pseudospin Hamiltonians. In the limit of large numbers of nucleons these bounds become equal. A simple algorithm is developed for computing Esub(g)/N, F(β)/N and S/N (entropy per nucleon) exactly in the N → infinity limit. The values of Esub(g)N and F(β)/N are obtained by computing the minimum value of associated potential functions hsub(C) and phi. These potentials are constructed very simply from the pseudospin Hamiltonian. Ground-state energy phase transitions are determined by investigating how the minima of the potential hsub(C) charge as a function of changing nuclear interaction parameters. Thermodynamic phase transitions are determined by investigating how the minima of the potential phi change as a function of changing nuclear temperature. Concise conditions are given for the occurrence of a second-order phase transition of either type. These conditions define critical values of the nuclear interaction parameters at which a ground-state energy second-order phase transition occurs and the critical temperature at which a thermodynamic second-order phase transition occurs. A 'crossover theorem' relates the occurrence of a ground-state energy phase transition to a thermodynamic phase transition. (Auth.)
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Record Type
Journal Article
Journal
Nucl. Phys., A; ISSN 0029-5582;
; v. 301(2); p. 189-204

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AbstractAbstract
[en] Two forms of a velocity-dependent effective potential are used. The binding energy and the incompressibility of the nuclear matter are calculated. These are found to be in a good agreement with those obtained by others and with the experimental results. The single-particle potential, the effective mass M* and the nuclear surface energy are also discussed and compared with those obtained by the others. (orig.)
[de]
Zwei verschiedene geschwindigkeitsabhaengige effektive Potentiale werden zur Berechnung der Bindungsenergie und der Inkompressibilitaet der Kernmaterie verwendet. Die Ergebnisse stimmen gut mit anderen Rechnungen und mit experimentellen Daten ueberein. Das Einteilchenpotential, die effektive Masse M* und die Oberflaechenenergie des Kerns werden ebenfalls diskutiert und mit anderen Ergebnissen verglichen. (orig.)Primary Subject
Record Type
Journal Article
Journal
Z. Phys., A; v. 286(3); p. 319-325
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AbstractAbstract
[en] The low energy scattering of nucleons by 2H, 3He and 4He are analyzed for parity nonconserving effects. The asymmetry in the total cross section of longitudinally polarized projectiles is formulated in terms of the optical theorem and a distorted wave Born approximation. For two nucleons at low energies it is only necessary to consider l = 0 to l = 1 matrix elements of the weak nucleon-nucleon potential. The asymmetries in the scattering from nuclear targets are related to the parameters of an effective weak nucleon-nucleon potential, so that they may be used to help differentiate between various proposed theoretical potentials. (Auth.)
Primary Subject
Record Type
Journal Article
Journal
Nucl. Phys., A; ISSN 0029-5582;
; v. 300(2); p. 265-272

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