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421.
422.
Anthony PL Arnold RG Arroyo C Baird K Bega K Biesiada J Bosted PE Breuer M Carr R Cates GD Chen JP Chudakov E Cooke M Decker FJ Decowski P Deur A Emam W Erickson R Fieguth T Field C Gao J Gustafsson K Hicks RS Holmes R Hughes EW Humensky TB Jones GM Kaufman LJ Kolomensky YG Kumar KS Lhuillier D Lombard-Nelsen R Mastromarino P Mayer B McKeown RD Michaels R Olson M Paschke KD Peterson GA Pitthan R Pope K Relyea D Rock SE Saxton O Shapiro G Singh J Souder PA Szalata ZM Tobias WA Tonguc BT Turner J 《Physical review letters》2004,92(18):181602
We report a measurement of the parity-violating asymmetry in fixed target electron-electron (M?ller) scattering: A(PV)=[-175+/-30(stat)+/-20(syst)] x 10(-9). This first direct observation of parity nonconservation in M?ller scattering leads to a measurement of the electron's weak charge at low energy Q(e)(W)=-0.053+/-0.011. This is consistent with the standard model expectation at the current level of precision: sin((2)theta(W)(M(Z))((-)MS)=0.2293+/-0.0024(stat)+/-0.0016(syst)+/-0.0006(theory). 相似文献
423.
L. C. Woods 《Applied Scientific Research》1958,7(1):89-101
Summary The Schwarz-Christoffel formula for the mapping of a polygon in thez-plane on an upper half-plane (thew-plane) is extended to deal with singlyconnected domains of quite general shape. The mapping problem in the general ease is shown to depend on the solution of an awkward integrodifferential equation and an iterative method of finding this solution is indicated. Two further generalizations are made to the formula; these are (i) the boundary of the singly-connected domain in thez-plane is mapped on to afinite interval of the real axis of thew-plane instead of the whole of it, and (ii) the formula is extended to deal with doubly-connected domains.Paper, read at the first annual general meeting of the Australian Mathematical Society at Sydney, August, 1957. 相似文献
424.
Z. Janas L. Batist J. Döring M. Gierlik R. Kirchner J. Kurcewicz H. Mahmud C. Mazzocchi A. Płochocki E. Roeckl K. Schmidt P. J. Woods J. Żylicz 《The European Physical Journal A - Hadrons and Nuclei》2005,23(3):401-408
The very neutron-deficient 117Ba nuclei were produced in 58Ni-induced reactions on a 63Cu target and selected for spectroscopic studies by using BaF+ molecules formed in the ion source of the GSI on-line mass separator. The -decay of 117Ba was investigated by means of the total absorption -ray spectrometer and a telescope for -delayed particle detection. In the analysis combining the -delayed -ray and proton data the energy window available for -delayed proton emission, the branching ratios for proton transitions to the 116Xe levels and the -feeding of the -ray and proton-emitting 117Cs states were determined. The -strength function for 117Ba derived from the measured -feeding distribution revealed the existence of a broad resonance structure at 117Cs excitation energy of about 4-5 MeV. The results of the -delayed proton studies and -strength measurements are confronted with theoretical predictions. 相似文献
425.
Anthony PL Arnold RG Arroyo C Bega K Biesiada J Bosted PE Bower G Cahoon J Carr R Cates GD Chen JP Chudakov E Cooke M Decowski P Deur A Emam W Erickson R Fieguth T Field C Gao J Gary M Gustafsson K Hicks RS Holmes R Hughes EW Humensky TB Jones GM Kaufman LJ Keller L Kolomensky YG Kumar KS LaViolette P Lhuillier D Lombard-Nelsen RM Marshall Z Mastromarino P McKeown RD Michaels R Niedziela J Olson M Paschke KD Peterson GA Pitthan R Relyea D Rock SE Saxton O Singh J Souder PA Szalata ZM Turner J 《Physical review letters》2005,95(8):081601
We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (M?ller) scattering: A(PV) = [-131 +/- 14(stat) +/- 10(syst)] x 10(-9), leading to the determination of the weak mixing angle sin2(thetaW(eff) = 0.2397 +/- 0.0010(stat) +/- 0.0008(syst), evaluated at Q2 = 0.026 GeV2. Combining this result with the measurements of sin2(thetaW(eff) at the Z0 pole, the running of the weak mixing angle is observed with over 6sigma significance. The measurement sets constraints on new physics effects at the TeV scale. 相似文献
426.
427.
Large crystals of cadmium sulphide have been grown in various partial pressures of cadmium and sulphur vapour. The concentration and ionisation energy of the shallow donors in the different crystals have been determined by measuring the Hall coefficient and electrical conductivity of semiconducting samples, and by comparing the magnitudes of the drift and Hall mobilities in photoconducting (semi-insulating) samples. The variation of the donor and acceptor content can be explained in broad terms in relation to the parameters of crystal growth. Hall measurements indicate that the ionisation energy of the shallow donors is 0·021 ± 0·002eV. The drift mobility experiment suggests that two shallow traps are present with energy depths of 0·015 and 0·037 eV. The variation of Hall mobility with temperature over the range 30–300°K can be explained in terms of polar optical mode, piezoelectric and ionised impurity scattering. The best value of effective mass obtained was 0·19m. 相似文献
428.
This paper is concerned with continuity properties of representations of the canonical commutation relations, and is mainly devoted to a detailed discussion of the topologies induced on the test function spaces. The notion of closability of a representation of the canonical commutation relations is introduced and studied. We also discuss the strong continuity of functions of self-adjoint operators, and use bounded functions to define an analogue of the strong operator topology on the set of all self-adjoint operators. 相似文献
429.
430.