Search

Your search keyword '"Hofstadter, R."' showing total 499 results
Start Over Author "Hofstadter, R."
499 results on '"Hofstadter, R."'

51. Gamma-ray Astrophysics: a New Look at the Universe

Author

Trombka, J. I, Fichtel, C. E, Grindlay, J, and Hofstadter, R

Subjects
Astrophysics
Abstract

Gamma-ray astronomy which includes the spectral region from above approximately 100 keV to greater than or equal to 1000 GeV permits investigation of the most energetic photons originating in our galaxy and beyond and provides the most direct means of studying the largest transfers of energy occurring in astrophysical processes. Of all the electromagnetic spectrum, high-energy gamma-ray astronomy measures most directly the presence and dynamic effects of the energetic charged cosmic ray particles, element synthesis, and particle acceleration. Further, gamma rays suffer negligible absorption or scatterings as they travel in straight paths; hence, they may survive billions of years and still reveal their source. The high energy processes in stellar objects (including our Sun), the dynamics of the cosmic-ray gas, the formation of clouds and nebulae, galactic evolution and even certain aspects of cosmology and the origin of the universe may be explored by gamma-ray observations.

Published
1978

52. Measurements of the reaction e/+/e/-/ yielding gamma-gamma at center-of-mass energies in the range 6.2-7.4 GeV

Author

Hilger, E, Beron, B. L, Carrington, R. L, Ford, R. L, Hill, W. T, Hofstadter, R, Hughes, E. B, Liberman, A. D, Martin, T. W, and Oneill, L. H

Subjects
Nuclear And High-Energy Physics
Abstract

The cross section for the pair-annihilation reaction e(+)e(-) yields gamma-gamma were measured at center-of-mass energies in the range 6.2-7.4 GeV and at production angles close to 90 deg. The experimental apparatus consisted of two identical spectrometers which were set to view the luminous region at SPEAR-II from opposite directions at an azimuthal angle of 45 deg. In each spectrometer there was a NaI(TI) crystal 20 radiation lengths thick and 30 in. in diameter to measure the gamma-ray energies. Annihilation events were detected by an electronic trigger which required only the observation in coincidence of more than 0.2 GeV in each NaI(TI) crystal within + or - 15 nsec of the crossing beams. The observed rates of pair-annihilation events were found to be in agreement with those expected from quantum electrodynamics (QED) at all the center-of-mass energies used.

Published
1977

53. Design study for LANDSAT-D attitude control system

Author

Iwens, R. P, Bernier, G. E, Hofstadter, R. F, Mayo, R. A, and Nakano, H

Subjects
Launch Vehicles And Space Vehicles
Abstract

The gimballed Ku-band antenna system for communication with TDRS was studied. By means of an error analysis it was demonstrated that the antenna cannot be open loop pointed to TDRS by an onboard programmer, but that an autotrack system was required. After some tradeoffs, a two-axis, azimuth-elevation type gimbal configuration was recommended for the antenna. It is shown that gimbal lock only occurs when LANDSAT-D is over water where a temporary loss of the communication link to TDRS is of no consequence. A preliminary gimbal control system design is also presented. A digital computer program was written that computes antenna gimbal angle profiles, assesses percent antenna beam interference with the solar array, and determines whether the spacecraft is over land or water, a lighted earth or a dark earth, and whether the spacecraft is in eclipse.

Published
1977

54. Design study for LANDSAT D attitude control system

Author

Iwens, R. P, Bernier, G. E, and Hofstadter, R. F

Subjects
Launch Vehicles And Space Vehicles
Abstract

A design and performance evaluation is presented for the LANDSAT D attitude control system (ACS). Control and configuration of the gimballed Ku-band antenna system for communication with the tracking and data relay satellite (TDRS). Control of the solar array drive considered part of the ACS is also addressed.

Published
1976

56. Measurement of $\pi^0\pi^0$ production in two-photon collisions

Author

Marsiske, H., Antreasyan, D., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D., Engler, A., Bartels, H. W., Fairfield, K., Folger, G., Fridman, A., Gaiser, D., Gelphman, D., Glaser, G., Godfrey, G., Graaf, K., Heimlich, F. H., Heinsius, F. H., Besset, D., Hofstadter, R., Irion, J., Jakubowski, Z., Janssen, H., Karch, K., Keh, S., Kiel, T., Kilian, H., Kirkbride, I., Kloiber, T., Bieler, Ch., Kobel, M., Koch, W., Konig, A. C., Konigsmann, K., Kraemer, R. W., Kruger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Bienlein, J. K., Litke, A. M., Lockman, W. S., Lowe, S., Lurz, B., Marlow, D., Maschmann, W., McBride, P., Messing, F., Metzger, W. J., Meyer, H., Bizzeti, A., Monteleoni, B., Muryn, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F. C., Prindle, D., Bloom, E. D., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schutte, J., Schwarz, A., Sievers, D., Brock, I., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., van Uitert, B., Van de Walle, R. T., Vogel, H., Voigt, A., Brockmuller, K., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., Williams, D. A., Zschorsch, P., and Crystal Ball Collaboration

Subjects
two-photon [exchange], channel cross section, photon photon [interaction], electroproduction [pi0], width [f2(1270)], DESY DORIS Stor, inelastic scattering [electron positron], +2pi0+positron+electron%22">electron positron --> 2pi0 positron electron, pi0 [electroproduction], helicity, ((1, interaction [photon photon], angular dependence [differential cross section], differential cross section [angular dependence], width [f0(1400)], colliding beams [electron positron], electron positron [inelastic scattering], ddc:530, electron positron [colliding beams], mass spectrum [(2pi0)], Crystal Ball, exchange [two-photon], (2pi0) [mass spectrum], width [f0(980)], experimental results
Abstract

The reaction $e^+e^−→e^+e^−π^0π^0$ has been analyzed using 97pb$^{−1}$ of data taken with the Crystal Ball detector at the DESY $e^−e^+$ storage ring DORIS II at beam energies around 5.3 GeV. For the first time we have measured the cross section for $γγ→π^0π^0$ for π0π0 mvariant masses ranging from threshold to about 2 GeV. We measure an approximately flat cross section of about 10 nb for W=$mπ^0π^0

Published
1990
Full Text
View/download PDF

57. Limits on axion and light Higgs boson production in $\Upsilon (1S)$ decays

Author

Antreasyan, D., Bartels, H. W. S., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D. G., Engler, A., Fairfield, K., Besset, D., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Graaf, K., Heimlich, F. H., Heinsius, F. H., Hofstadter, R., Bieler, C., Irion, J., Jakubowski, Z., Janssen, H., Karch, K., Keh, S., Kiel, T., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Bienlein, J. K., Koch, W. S., Konig, A. C., Konigsmann, Kay, Kraemer, R. W., Kruger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Litke, A., Bizzeti, A., Lockman, William S., Lowe, S., Lurz, B., Marlow, Daniel R., Marsiske, H., Maschmann, W. S., McBride, P., Messing, F., Metzger, W. J., Meyer, H., Bloom, Elliott D., Monteleoni, B., Muryn, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F., Prindle, D., Brock, I., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schutte, J., Schwarz, Andreas S., Sievers, D., Brockmuller, K., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., van Uitert, B., Van de Walle, R. T., Vogel, H., Voigt, A., Cabenda, R., Volland, U., Wachs, K., Wacker, K., Walk, W. S., Wegener, H., Williams, D., Zschorsch, P., and Crystal Ball Collaboration

Subjects
axion [search for], annihilation: electron positron, +photon+axion%22">Upsilon(9460) --> photon axion, Upsilon(9460) [electroproduction], radiative decay [Upsilon(9460)], DESY DORIS Stor, Upsilon(9460): electroproduction, branching ratio: upper limit, (photon): energy spectrum, annihilation [electron positron], electron positron: annihilation, Higgs particle [mass], electroproduction: Upsilon(9460), Higgs particle: search for, 10.57 GeV-cms [9.46], S055H2A, radiative decay: Upsilon(9460), postulated particle: axion, energy spectrum: (photon), +Higgs+particle+photon%22">Upsilon(9460) --> Higgs particle photon, search for: axion, ddc:530, electron positron [colliding beams], search for [Higgs particle], mass: Higgs particle, electron positron [annihilation], energy spectrum [(photon)], mass [Higgs particle], electron positron: colliding beams, Upsilon(9460) [radiative decay], Upsilon(9460): width, Higgs particle: mass, colliding beams: electron positron, 9.46: 10.57 GeV-cms, S029AXQ, colliding beams [electron positron], upper limit [branching ratio], electroproduction [Upsilon(9460)], width [Upsilon(9460)], axion [postulated particle], (photon) [energy spectrum], Crystal Ball, Upsilon(9460): radiative decay, experimental results
Abstract

7 pp. (1990)., We have searched for axion and light Higgs boson production in the channel $ϒ (1S)$ → $(a^0 or h^0) + γ$, where the non-interacting axion a0 and the Higgs boson $h^0$ do not decay in the detector. We find no evidence for an axion and give an upper limit,$ Br(ϒ (1S) → a^0γ) < 4.0 × 10^{−5} (90% CL)$, for long-lived axions. Combining our limit with the previous search in J/ψ decays, we are able to rule out the axion in the standard model with first order QCD corrections. Our $ϒ (1S)$ data also rule out a Higgs boson with mass mh < 86 MeV.

Published
1990
Full Text
View/download PDF

64. *Measurement of the Branching Ratios for the Decays Tau->Hadron Pi-0-Nu and Tau->Hadron Pi-0-Pi-0-Nu

Author

Antreasyan, D., Bartels, H.W., Besset, D., Bieler, Ch, Bienlein, J.K., Bizzeti, A., Bloom, E.D., Brock, I., Brockmüller, K., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D., Engler, A., Fairfield, K., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Graaf, K., Heimlich, F.H., Heinsius, F.H., Hofstadter, R., Irion, J., Jakubowski, Z., Janssen, H., Karch, K., Keh, S., Kiel, T., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Koch, W., König, A. C., Königsmann, K., Kraemer, R.W., Krüger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Litke, A.M., Lockman, W., Lowe, S., Lurz, B., Marlow, D., Marsiske, H., Maschmann, W., McBride, P., Meyer, H., Muryn, B., Messing, F., Metzger, W.J., Monteleoni, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P.G., Pollock, B., Porter, F.C., Prindle, D., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schütte, J., Schwarz, A., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H.J., Uitert, B. van, Walle, R.T. van de, Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., Williams, D.A., Zschorsch, P., Antreasyan, D., Bartels, H.W., Besset, D., Bieler, Ch, Bienlein, J.K., Bizzeti, A., Bloom, E.D., Brock, I., Brockmüller, K., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D., Engler, A., Fairfield, K., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Graaf, K., Heimlich, F.H., Heinsius, F.H., Hofstadter, R., Irion, J., Jakubowski, Z., Janssen, H., Karch, K., Keh, S., Kiel, T., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Koch, W., König, A. C., Königsmann, K., Kraemer, R.W., Krüger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Litke, A.M., Lockman, W., Lowe, S., Lurz, B., Marlow, D., Marsiske, H., Maschmann, W., McBride, P., Meyer, H., Muryn, B., Messing, F., Metzger, W.J., Monteleoni, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P.G., Pollock, B., Porter, F.C., Prindle, D., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schütte, J., Schwarz, A., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H.J., Uitert, B. van, Walle, R.T. van de, Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., Williams, D.A., and Zschorsch, P.

Abstract

Contains fulltext : 29793.pdf (publisher's version ) (Open Access)

Published
1991

68. Recent results from the crystal ball detector at SPEAR.

Author

Partridge, R., Peck, C., Porter, F., Kollmann, W., Richardson, M., Strauch, K., Wacker, K., Aschman, D., Burnett, T., Cavalli-Sforza, M., Coyne, D., Sadrozinski, H., Hofstadter, R., Kirkbride, I., Kolanoski, H., Liberman, A., O'Reilly, J., Tompkins, J., Bloom, E., and Bulos, F.

Published
1980
Full Text
View/download PDF

69. Measurement of the direct photon spectrum from ϒ (1S) decays

Author

Bizzeti, A., primary, Schütte, J., additional, Antreasyan, D., additional, Bieler, Ch., additional, Bienlein, J.K., additional, Bloom, E.D., additional, Brock, I., additional, Brockmüller, K., additional, Cartacci, A., additional, Cavalli-Sforza, M., additional, Compagnucci, A., additional, Conforto, G., additional, Cooper, S., additional, Coyne, D., additional, Fairfield, K.H., additional, Folger, G., additional, Fridman, A., additional, Glaser, G., additional, Godfrey, G., additional, Graaf, K., additional, Heimlich, F.H., additional, Heinsius, F.H., additional, Hofstadter, R., additional, Irion, J., additional, Jakubowski, Z., additional, Janssen, H., additional, Karch, K., additional, Keh, S., additional, Kiel, T., additional, Killian, H., additional, Kirkbride, I., additional, Kobel, M., additional, Koch, W., additional, König, A.C., additional, Königsmann, K., additional, Krüger, S., additional, Landi, G., additional, Lekebusch, R., additional, Lowe, S., additional, Lurz, B., additional, Marsiske, H., additional, Maschmann, W., additional, McBride, P., additional, Metzger, W.J., additional, Monteleoni, B., additional, Muryn, B., additional, Niczyporuk, B., additional, Nowak, G., additional, Pelfer, P.G., additional, Reidenbach, M., additional, Scheer, M., additional, Schmitt, P., additional, Schotanus, J., additional, Sievers, D., additional, Skwarnicki, T., additional, Stock, V., additional, Strauch, K., additional, Strohbusch, U., additional, Tompkins, J., additional, van Uitert, B., additional, Van de Walle, R.T., additional, Voigt, A., additional, Volland, U., additional, Wachs, K., additional, Wegener, H., additional, and Williams, D.A., additional

Published
1991
Full Text
View/download PDF

70. Measurement of ?0 and ? meson production ine + e ? annihilation at $$\sqrt s$$ near 10 GeV

Author

Bieler, Ch., primary, Antreasyan, D., additional, Bartels, H. W., additional, Besset, D., additional, Bienlein, J. K., additional, Bizzeti, A., additional, Bloom, E. D., additional, Brock, I., additional, Brockm�ller, K., additional, Cabenda, R., additional, Cartacci, A., additional, Cavalli-Sforza, M., additional, Clare, R., additional, Compagnucci, A., additional, Conforto, G., additional, Cooper, S., additional, Cowan, R., additional, Coyne, D., additional, Engler, A., additional, Fairfield, K., additional, Folger, G., additional, Fridman, A., additional, Gaiser, J., additional, Gelphman, D., additional, Glaser, G., additional, Godfrey, G., additional, Graaf, K., additional, Heimlich, F. H., additional, Heinsius, F. H., additional, Hofstadter, R., additional, Irion, J., additional, Jakubowski, Z., additional, Janssen, H., additional, Karch, K., additional, Keh, S., additional, Kiel, T., additional, Kilian, H., additional, Kirkbride, I., additional, Kloiber, T., additional, Kobel, M., additional, Koch, W., additional, K�nig, A. C., additional, K�nigsmann, K., additional, Kraemer, R. W., additional, Kr�ger, S., additional, Landi, G., additional, Lee, R., additional, Leffler, S., additional, Lekebusch, R., additional, Litke, A. M., additional, Lockman, W., additional, Lowe, S., additional, Lurz, B., additional, Marlow, D., additional, Marsiske, H., additional, Maschmann, W., additional, McBride, P., additional, Messing, F., additional, Metzger, W. J., additional, Meyer, H., additional, Monteleoni, B., additional, Muryn, B., additional, Nernst, R., additional, Niczyporuk, B., additional, Nowak, G., additional, Peck, C., additional, Pelfer, P. G., additional, Pollock, B., additional, Porter, F. C., additional, Prindle, D., additional, Ratoff, P., additional, Reidenbach, M., additional, Renger, B., additional, Rippich, C., additional, Scheer, M., additional, Schmitt, P., additional, Schotanus, J., additional, Sch�tte, J., additional, Schwarz, A., additional, Sievers, D., additional, Skwarnicki, T., additional, Stock, V., additional, Strauch, K., additional, Strohbusch, U., additional, Tompkins, J., additional, Trost, H. I., additional, Uitert, B., additional, Walle, R. T., additional, Vogel, H., additional, Voigt, A., additional, Volland, U., additional, Wachs, K., additional, Wacker, K., additional, Walk, W., additional, Wegener, H., additional, Williams, D. A., additional, and Zschorsch, P., additional

Published
1991
Full Text
View/download PDF

71. Measurement of the branching ratios for the decays τ→hadron π0ν and τ→hadron π0π0ν

Author

Antreasyan, D., primary, Bartels, H.W., additional, Besset, D., additional, Bieler, Ch., additional, Bienlein, J.K., additional, Bizzeti, A., additional, Bloom, E.D., additional, Brock, I., additional, Brockmüller, K., additional, Cabenda, R., additional, Cartacci, A., additional, Cavalli-Sforza, M., additional, Clare, R., additional, Compagnucci, A., additional, Conforto, G., additional, Cooper, S., additional, Cowan, R., additional, Coyne, D., additional, Engler, A., additional, Fairfield, K., additional, Folger, G., additional, Fridman, A., additional, Gaiser, J., additional, Gelphman, D., additional, Glaser, G., additional, Godfrey, G., additional, Graaf, K., additional, Heimlich, F.H., additional, Heinsius, F.H., additional, Hofstadter, R., additional, Irion, J., additional, Jakubowski, Z., additional, Janssen, H., additional, Karch, K., additional, Keh, S., additional, Kiel, T., additional, Kilian, H., additional, Kirkbride, I., additional, Kloiber, T., additional, Kobel, M., additional, Koch, W., additional, König, A.C., additional, Königsmann, K., additional, Krämer, R.W., additional, Krüger, S., additional, Landi, G., additional, Lee, R., additional, Leffler, S., additional, Lekebusch, R., additional, Litke, A.M., additional, Lockman, W., additional, Lowe, S., additional, Lurz, B., additional, Marlow, D., additional, Marsiske, H., additional, Maschmann, W., additional, McBride, P., additional, Meyer, H., additional, Muryn, B., additional, Messing, F., additional, Metzger, W.J., additional, Monteleoni, B., additional, Nernst, R., additional, Niczyporuk, B., additional, Nowak, G., additional, Peck, C., additional, Pelfer, P.G., additional, Pollock, B., additional, Porter, F.C., additional, Prindle, D., additional, Ratoff, P., additional, Reidenbach, M., additional, Renger, B., additional, Rippich, C., additional, Scheer, M., additional, Schmitt, P., additional, Schotanus, J., additional, Schütte, J., additional, Schwarz, A., additional, Sievers, D., additional, Skwarnicki, T., additional, Stock, V., additional, Strauch, K., additional, Strohbusch, U., additional, Tompkins, J., additional, Trost, H.J., additional, van Uitert, B., additional, Van de Walle, R.T., additional, Vogel, H., additional, Voigt, A., additional, Volland, U., additional, Wachs, K., additional, Wacker, K., additional, Walk, W., additional, Wegener, H., additional, Williams, D.A., additional, and Zschorsch, P., additional

Published
1991
Full Text
View/download PDF

72. Limits on axion and light Higgs boson production in ϒ (1S) decays

Author

Antreasyan, D., primary, Bartels, H.W., additional, Besset, D., additional, Bieler, Ch., additional, Bienlein, J.K., additional, Bizzeti, A., additional, Bloom, E.D., additional, Brock, I., additional, Brockmüller, K., additional, Cabenda, R., additional, Cartacci, A., additional, Cavalli-Sforza, M., additional, Clare, R., additional, Compagnucci, A., additional, Conforto, G., additional, Cooper, S., additional, Cowan, R., additional, Coyne, D., additional, Engler, A., additional, Fairfield, K.H., additional, Folger, G., additional, Fridman, A., additional, Gaiser, D., additional, Gelphman, D., additional, Glaser, G., additional, Godfrey, G., additional, Graaf, K., additional, Heimlich, F.H., additional, Heinsius, F.H., additional, Hofstadter, R., additional, Irion, J., additional, Jakubowski, Z., additional, Janssen, H., additional, Karch, K., additional, Keh, S., additional, Kiel, T., additional, Kilian, H., additional, Kirkbride, I., additional, Kloiber, T., additional, Kobel, M., additional, Koch, W., additional, König, A.C., additional, Königsmann, K., additional, Krämer, R.W., additional, Krüger, S., additional, Landi, G., additional, Lee, R., additional, Leffler, S., additional, Lekebusch, R., additional, Litke, A.M., additional, Lockman, W., additional, Lowe, S., additional, Lurz, B., additional, Marlow, D., additional, Marsiske, H., additional, Maschmann, W., additional, McBride, P., additional, Messing, F., additional, Metzger, W.J., additional, Meyer, H., additional, Monteleoni, B., additional, Muryn, B., additional, Nernst, R., additional, Niczyporuk, B., additional, Nowak, G., additional, Peck, C., additional, Pelfer, P.G., additional, Pollock, B., additional, Porter, F.C., additional, Prindle, D., additional, Ratoff, P., additional, Reidenbach, M., additional, Renger, B., additional, Rippich, C., additional, Scheer, M., additional, Schmitt, P., additional, Schotanus, J., additional, Schütte, J., additional, Schwarz, A., additional, Sievers, D., additional, Skwarnicki, T., additional, Stock, V., additional, Strauch, K., additional, Strohbusch, U., additional, Tompkins, J., additional, Trost, H.J., additional, van Uitert, B., additional, Van de Walle, R.T., additional, Vogel, H., additional, Voigt, A., additional, Volland, U., additional, Wachs, K., additional, Wacker, K., additional, Walk, W., additional, Wegener, H., additional, Williams, D.A., additional, and Zschorsch, P., additional

Published
1990
Full Text
View/download PDF

73. Observation of a new ηπ0π0 resonance at 1900 MeV/c2 in two-photon scattering

Author

Karch, K., primary, Antreasyan, D., additional, Bartels, H.W., additional, Besset, D., additional, Bieler, Ch., additional, Bienlein, J.K., additional, Bizzeti, A., additional, Bloom, E.D., additional, Brock, I., additional, Brockmüller, K., additional, Cabenda, R., additional, Cartacci, A., additional, Cavalli-Sforza, M., additional, Clare, R., additional, Compagnucci, A., additional, Conforto, G., additional, Cooper, S., additional, Cowan, R., additional, Coyne, D., additional, Engler, A., additional, Fairfield, K., additional, Folger, G., additional, Fridman, A., additional, Gaiser, J., additional, Gelphman, D., additional, Glaser, G., additional, Godfrey, G., additional, Graaf, K., additional, Heimlich, F.H., additional, Heinsius, F.H., additional, Hofstadter, R., additional, Irion, J., additional, Jakubowski, Z., additional, Janssen, H., additional, Keh, S., additional, Kiel, T., additional, Kilian, H., additional, Kirkbride, I., additional, Kloiber, T., additional, Kobel, M., additional, Koch, W., additional, König, A.C., additional, Königsmann, K., additional, Kraemer, R.W., additional, Krüger, S., additional, Landi, G., additional, Lee, R., additional, Leffler, S., additional, Lekebusch, R., additional, Litke, A.M., additional, Lockman, W., additional, Lowe, S., additional, Lurz, B., additional, Marlow, D., additional, Marsiske, H., additional, Maschmann, W., additional, McBride, P., additional, Messing, F., additional, Metzger, W.J., additional, Meyer, H., additional, Monteleoni, B., additional, Muryn, B., additional, Nernst, R., additional, Niczyporuk, B., additional, Nowak, G., additional, Peck, C., additional, Pelfer, P.G., additional, Pollock, B., additional, Porter, F.C., additional, Prindle, D., additional, Ratoff, P., additional, Reidenbach, M., additional, Renger, B., additional, Rippich, C., additional, Scheer, M., additional, Schmitt, P., additional, Schotanus, J., additional, Schütte, J., additional, Schwarz, A., additional, Sievers, D., additional, Skwarnicki, T., additional, Stock, V., additional, Strauch, K., additional, Strohbusch, U., additional, Tompkins, J., additional, Trost, H.J., additional, van Uitert, B., additional, Van de Walle, R.T., additional, Vogel, H., additional, Voigt, A., additional, Volland, U., additional, Wachs, K., additional, Wacker, K., additional, Walk, W., additional, Wegener, H., additional, Williams, D.A., additional, and Zschorsch, P., additional

Published
1990
Full Text
View/download PDF

74. Measurement ofπ0π0production in two-photon collisions

Author

Marsiske, H., primary, Antreasyan, D., additional, Bartels, H. W., additional, Besset, D., additional, Bieler, Ch., additional, Bienlein, J. K., additional, Bizzeti, A., additional, Bloom, E. D., additional, Brock, I., additional, Brockmüller, K., additional, Cabenda, R., additional, Cartacci, A., additional, Cavalli-Sforza, M., additional, Clare, R., additional, Compagnucci, A., additional, Conforto, G., additional, Cooper, S., additional, Cowan, R., additional, Coyne, D., additional, Engler, A., additional, Fairfield, K., additional, Folger, G., additional, Fridman, A., additional, Gaiser, D., additional, Gelphman, D., additional, Glaser, G., additional, Godfrey, G., additional, Graaf, K., additional, Heimlich, F. H., additional, Heinsius, F. H., additional, Hofstadter, R., additional, Irion, J., additional, Jakubowski, Z., additional, Janssen, H., additional, Karch, K., additional, Keh, S., additional, Kiel, T., additional, Kilian, H., additional, Kirkbride, I., additional, Kloiber, T., additional, Kobel, M., additional, Koch, W., additional, König, A. C., additional, Königsmann, K., additional, Kraemer, R. W., additional, Krüger, S., additional, Landi, G., additional, Lee, R., additional, Leffler, S., additional, Lekebusch, R., additional, Litke, A. M., additional, Lockman, W. S., additional, Lowe, S., additional, Lurz, B., additional, Marlow, D., additional, Maschmann, W., additional, McBride, P., additional, Messing, F., additional, Metzger, W. J., additional, Meyer, H., additional, Monteleoni, B., additional, Muryn, B., additional, Nernst, R., additional, Niczyporuk, B., additional, Nowak, G., additional, Peck, C., additional, Pelfer, P. G., additional, Pollock, B., additional, Porter, F. C., additional, Prindle, D., additional, Ratoff, P., additional, Reidenbach, M., additional, Renger, B., additional, Rippich, C., additional, Scheer, M., additional, Schmitt, P., additional, Schotanus, J., additional, Schütte, J., additional, Schwarz, A., additional, Sievers, D., additional, Skwarnicki, T., additional, Stock, V., additional, Strauch, K., additional, Strohbusch, U., additional, Tompkins, J., additional, Trost, H. J., additional, van Uitert, B., additional, Van de Walle, R. T., additional, Vogel, H., additional, Voigt, A., additional, Volland, U., additional, Wachs, K., additional, Wacker, K., additional, Walk, W., additional, Wegener, H., additional, Williams, D. A., additional, and Zschorsch, P., additional

Published
1990
Full Text
View/download PDF

81. The Crystal Ball Data Acquisition System.

Author

Chestnut, R., Kiesling, C., Bloom, E., Bulos, F., Gaiser, J., Godfrey, G., Oreglia, M., Partridge, R., Peck, C., Porter, F., Aschman, D., Cavali-Sforza, M., Coyne, D., Sadrozinski, H., Kollmann, W., Richardson, M., Strauch, K., Hofstadter, R., Kirkbride, I., and Kolanoski, H.

Published
1979
Full Text
View/download PDF

87. Calibration of the Egret High-Energy Gamma-Ray Telescope in the Range 20-10,000 MeV with a Tunable Beam of Quasi-Monoenergetic Gamma Rays at SLAC.

Author

Thompson, D. J., Bertsch, D. L., Favale, A., Fichtel, C. E., Hartman, R. C., Hofstadter, R., Hughes, E. B., Hunter, S. D., Hughlock, B. W., Kanbach, G. O., Kniffen, D. A., Lin, Y. C., Mattox, J. R., Mayer-Hasselwander, H., Nolan, P. L., Pinkau, K., Rothermel, H., Schneid, E., Sommer, M., and Walker, A. H.

Published
1987
Full Text
View/download PDF

89. Coronary angiography using synchrotron radiation (invited).

Author

Thompson, A. C., Rubenstein, E., Zeman, H. D., Hofstadter, R., Otis, J. N., Giacomini, J. C., Gordon, H. J., Brown, G. S., Thomlinson, W., and Kernoff, R. S.

Subjects
ANGIOGRAPHY, CORONARY arteries, SYNCHROTRON radiation
Abstract

Imaging of coronary arteries using a venous instead of an arterial injection of contrast agent could provide a much safer method to diagnose heart disease. The tunability, intensity, and collimation of synchrotron radiation x-ray beams makes possible imaging systems with greatly improved imaging sensitivity. A pair of fan x-ray beams, a movable patient chair, and a multielement x-ray detector are used to acquire a pair of x-ray images above and below the iodine K edge. The logarithmic subtraction of these two images produces an image with excellent sensitivity to contrast agent and minimal sensitivity to bone and tissue. High-quality images from a dog and preliminary images from five humans have been obtained. Improvements are being -made to the system to increase the effective radiation flux and to measure the position of both x-ray beams. [ABSTRACT FROM AUTHOR]

Published
1989
Full Text
View/download PDF

98. Use of a Low Energy Proton Accelerator for Calibrating a Large NaI(Tl) Array in a High Energy Physics Experiment

Author

Kirkbride, G. I., O'Reilly, J. G., Tompkins, J. C., Aschman, D. G., Beron, B. L., Bloom, E. D., Bulos, F., Gaiser, J. E., Godfrey, G. L., Hofstadter, R., Hughes, E. B., Kiesling, C. M., Kolanoski, H. F., Kollmann, W. K., Liberman, A. D., Oreglia, M. J., E, Parks, R., Partridge, R. A., Peck, C. W., Porter, F. C., Sadrozinski, H. F., and Strauch, K.

Abstract

We report the use of a 500 keV Van de Graaff proton accelerator to produce ¿-rays in the range 4 - 18 MeV via nuclear reactions for the purpose of calibrating a large NaI(Tl) crystal array. Data analysis indicates an energy calibration to ~ 1% over this range.

Published
1987
Full Text
View/download PDF

99. Determination ofГee of the Υ(1S) and Υ(2S) resonances, and measurement ofR atW=9.39 GeV

Author

Jakubowski, Z., Antreasyan, D., Bartels, H. W., Besset, D., Bieler, Ch., Bienlein, J. K., Bizzeti, A., Bloom, E. D., Brock, I., Brockmüller, K., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cowan, R., Coyne, D., Drews, G., Engler, A., Fairfield, K., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Graaf, K., Heimlich, F. H., Heinsius, F. H., Hofstadter, R., Irion, J., Janssen, H., Karch, K., Keh, S., Kiel, T., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Koch, W., König, A. C., Königsmann, K., Kraemer, R. W., Krüger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Litke, A. M., Lockmann, W., Lowe, S., Lurz, B., Marlow, D., Marsiske, H., Maschmann, W., McBride, P., Meyer, H., Muryn, B., Messing, F., Metzger, W. J., Monteleoni, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pegel, C., Pelfer, P. G., Pollock, B., Pols, C., Porter, F. C., Prindle, D., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schütte, J., Schwarz, A., Selonke, F., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., van Uitert, B., Van de Walle, R. T., Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., Williams, D., and Zschorsch, P.

Abstract

Using the Crystal Ball detector operating at the DORIS II storage ring we have measured the leptonic partial widthsГee of the Υ(1S) and Υ(2S) resonances. We find $$\Gamma _{ee} (\Upsilon (1S)) = 1.34 \pm 0.03 \pm 0.06keV$$ and $$\Gamma _{ee} (\Upsilon (2S)) = 0.56 \pm 0.04 \pm 0.02keV.$$ The effect onГee of applying different prescriptions for radiative corrections is discussed. We also measureR, the ratio of non-resonant hadronic cross section to the Born cross section of μ pair production, at c.m. energyW=9.39 GeV to beR=3.48±0.04±0.16.

Published
1988
Full Text
View/download PDF

100. Measurement of π0 and η meson production ine+e− annihilation at <img src="/fulltext-image.asp?format=htmlnonpaginated&src=K750284323704627_html\10052_2005_Article_BF01555494_TeX2GIFIE1.gif" border="0" al

Author

Bieler, Ch., Antreasyan, D., Bartels, H. W., Besset, D., Bienlein, J. K., Bizzeti, A., Bloom, E. D., Brock, I., Brockmüller, K., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D., Engler, A., Fairfield, K., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Graaf, K., Heimlich, F. H., Heinsius, F. H., Hofstadter, R., Irion, J., Jakubowski, Z., Janssen, H., Karch, K., Keh, S., Kiel, T., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Koch, W., König, A. C., Königsmann, K., Kraemer, R. W., Krüger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Litke, A. M., Lockman, W., Lowe, S., Lurz, B., Marlow, D., Marsiske, H., Maschmann, W., McBride, P., Messing, F., Metzger, W. J., Meyer, H., Monteleoni, B., Muryn, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F. C., Prindle, D., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schütte, J., Schwarz, A., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. I., van Uitert, B., Van de Walle, R. T., Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., Williams, D. A., and Zschorsch, P.

Abstract

We present a study of inclusive p0 and ? production ine+e- annihilation at ". Our analysis is based on integrated luminosities of 46.2 pb-1 taken at the ? (1 S) resonance and 42.1 pb-1 taken in the neighboring continuum. We measure the inclusive p0 and ? spectra for direct ? (1 S) ? 3g decays and continuum processes " and obtain the following mean particle multiplicities per event: $$\begin{array}{*{20}c} {Continuum:} \\ {\begin{array}{*{20}c} {\left\langle {n_{\pi ^0 } } \right\rangle = 3.64 \pm 0.21 \pm 0.36} & {\left\langle {n_\eta } \right\rangle = 0.22 \pm 0.04 \pm 0.03} \\ \end{array} } \\ {\Upsilon (1S) \to 3g:} \\ {\begin{array}{*{20}c} {\left\langle {n_{\pi ^0 } } \right\rangle = 3.39 \pm 0.14 \pm 0.34} & {\left\langle {n_\eta } \right\rangle = 0.35 \pm 0.04 \pm 0.04.} \\ \end{array} } \\ \end{array}$$ We compare our results with predictions of different fragmentation models and with other measurements performed ine+e- annihilation at similar center-of-mass energies.

Published
1991
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results