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4. ELECTRON INDUCED FISSION IN U^8, Bi209 AND TalSl

Author

Bowman, H.R., Gatti, R.C, Jared, R.C, Kilian, G., Moretto, L.G., Thompson, S.G., Croissiaux, M.R., Heisenberg, J.H., Hofstadter, R., Middleman, L.M., and Yearian, M.R.

Published
1967

5. Ensayo de vida de lámparas halógenas de bajo voltaje con reflector dicroico

Author

Hofstadter, R and Vignolo, Mario

Subjects
POTENCIA
Abstract

El uso masivo que se ha producido en el Uruguay de la lámpara halógena de bajo voltaje con reflector dicroico (generalmente llamada lámpara dicroica) ha despertado el especial interés de proyectistas y técnicos en iluminación respecto a las características particulares de estas lámparas, en especial, en lo que se refiere a su vida media. Se ha observado que en muchas instalaciones donde se han utilizado estas lámparas la frecuencia de falla ha sido muy superior a la esperada. Por otra parte, se ha observado una gran dispersión de estos valores dependiendo del fabricante, aún en los casos en que la vida media nominal especificada por todos ellos era la misma. El Grupo LUXROU, integrado por profesionales que trabajan en iluminación y por docentes del Grupo de Fotometría e Iluminación de la Facultad de Ingeniería, se propuso realizar un ensayo de vida a tensión nominal controlada, tomando una muestra de lámparas de todos los fabricantes disponibles en el Uruguay, resultando en un total de 60 lámparas ensayadas. Luego de aproximadamente dos años de ensayos se presentan en este trabajo los resultados del mismo. Se realiza un especial análisis de la evolución del flujo de las lámparas, realizando una comparación con la evolución esperada, utilizando los datos disponibles del fabricante. Asimismo se muestran los momentos de muerte de las lámparas y la evolución de las características del reflector dicroico. Por otra parte, y como consecuencia de la experiencia obtenida, se analizan cuáles deben ser las mejores condiciones de instalación para estas lámparas de forma de asegurar un desempeño adecuado de las mismas.

Published
2002

6. 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
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7. 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
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9. *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

11. Transvenous coronary angiography in humans using synchrotron radiation.

Author

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

Abstract

The risks and costs of the present method of visualizing the coronary arteries have limited the use of coronary angiography in long-term serial studies needed to establish the natural history of coronary atherosclerosis and its response to interventions. A less invasive method, in which the contrast agent is administered intravenously, has been developed using synchrotron radiation as the illuminating source. The present report describes the initial results in human subjects. The findings indicate that transvenous coronary angiograms can be acquired in this manner. Further refinements in the x-ray imaging system are expected to result in increased x-ray fluence and improved image quality.

Published
1986
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13. Formation of the Pseudoscalars $\pi^0$, $\eta$ and $\eta^\prime$ in the Reaction $\gamma \gamma \to \gamma \gamma$

Author

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

Subjects
PSEUDOSCALAR MESON [ELECTROPRODUCTION], ELECTRON POSITRON [INELASTIC SCATTERING], SEARCH FOR [NARROW RESONANCE], BIBLIOGRAPHY, WIDTH [ETA], UPPER LIMIT, +POSITRON+ELECTRON+2PHOTON%22">ELECTRON POSITRON --> POSITRON ELECTRON 2PHOTON, EXCLUSIVE REACTION [PHOTON PHOTON], RADIATIVE DECAY [PSEUDOSCALAR MESON], WIDTH [ETA(958)], +2PHOTON%22">PSEUDOSCALAR MESON --> 2PHOTON, 9.4-10.6 GEV-CMS, ELECTROPRODUCTION [PSEUDOSCALAR MESON], ddc:530, EXPERIMENTAL RESULTS, DESY DORIS II STOR, TWO-PHOTON [EXCHANGE], EXCHANGE [TWO-PHOTON], COLLIDING BEAMS [ELECTRON POSITRON], INELASTIC SCATTERING [ELECTRON POSITRON], NARROW RESONANCE [SEARCH FOR], WIDTH [PI0], ELECTRON POSITRON [COLLIDING BEAMS], +PSEUDOSCALAR+MESON+POSITRON+ELECTRON%22">ELECTRON POSITRON --> PSEUDOSCALAR MESON POSITRON ELECTRON, PSEUDOSCALAR MESON [RADIATIVE DECAY], BRANCHING RATIO [WIDTH], Crystal Ball
Abstract

The Crystal Ball detector has been used at the DORIS II storage ring at DESY to study the reaction e+e−→e+e−γ*γ*→e+e−γγ, where X is a narrow resonance with mass between 100 and 3000 MeV. Formation of π0, η, and η’ mesons is observed, and the following meson partial widths are obtained: Γπ0Γ0→γγ=7.7±0.5±0.5 eV, Γη−γγ=0.514±0.017±0.035 keV, and Γη’→γγ=4.7±0.5±0.5 keV. No other narrow resonances are observed, and upper limits are given for the product ΓX→γγBX→γγ. .AE

Published
1988
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14. Measurement of the decay $\Upsilon(2S)\to \pi\pi\Upsilon(1S)$

Author

Gelphman, D., Lurz, B., Cavalli-Sforza, M., Clare, R., Conforto, G., Cooper, S., Cowan, R., Coyne, D., Edwards, C., Engler, A., Folger, G., Fridman, A., Antreasyan, D., Gaiser, J., Godfrey, G., Heimlich, F. H., Hofstadter, R., Irion, J., Jakubowski, Z., Keh, S., Kilian, H., Kirkbride, I., Kloiber, T., Aschman, D., Koch, W., König, A. C., Königsmann, K., Kraemer, R. W., Lee, R., Leffler, S., Lekebush, R., Lezoch, P., Litke, A. M., Lockman, W., Besset, D., Lowe, S., Marlow, D., Maschmann, W., Matsui, T., Messing, F., Metzger, W. J., Monteleoni, B., Nernst, R., Newman-Holmes, C., Niczyporuk, B., Bienlein, J. K., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F. C., Prindle, D., Ratoff, P., Renger, B., Rippich, C., Scheer, M., Bloom, E. D., Schmitt, P., Schmitz, M., Schotanus, J., Schwarz, A., Sievers, D., Skwarnicki, T., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., Brock, I., Van de Walle, R. T., Vogel, H., Wacker, K., Volland, U., Wegener, H., Walk, W., Williams, D., Zschorsch, P., Crystal Ball Collaboration, Cabenda, R., and Cartacci, A.

Subjects
ddc:530
Abstract

Physical review / D 32(11), 2893 - 2900 (1985). doi:10.1103/PhysRevD.32.2893, Published by Inst., Woodbury, NY

Published
1985
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15. Measurements of the reaction e+e-→μ+μ- at center-of-mass energies in the range 6.2-7.4 GeV

Author

Beron, B.L. Carrington, R.L. Ford, R.L. Hilger, E. Hofstadter, R. Hughes, E.B. Liberman, A.D. Martin, T.W. O'Neill, L.H. Simpson, J.W. Resvanis, L.K.

Subjects
Physics::Instrumentation and Detectors, High Energy Physics::Experiment, Physics::History of Physics
Abstract

Measurements of the cross section for the muon-pair-annihilation reaction e+e-→μ+μ-, relative to Bhabha scattering.

Published
1978

16. Spin Analysis of the $\chi(b$) States

Author

Skwarnicki, T., Antreasyan, D., Conforto, G., Cooper, S., Cowan, R., Coyne, D. G., Edwards, C., Engler, A., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Besset, D., Godfrey, G., Heimlich, F. H., Hofstadter, R., Irion, J., Jakubowski, Z., Keh, S., Kilian, H., Kirkbride, I., Kloiber, T., Koch, W. S., Bienlein, J. K., Konig, A. C., Konigsmann, Kay, Kraemer, R. W. S., Lee, Roger A., Leffler, S., Lekebusch, R., Litke, A., Lockman, William S., Lowe, S., Lurz, B., Bloom, Elliott D., Marlow, Daniel R., Maschmann, W. S., Matsui, T., Messing, F., Metzger, W. J., Monteleoni, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Brock, I., Pelfer, P. G., Pollock, B., Porter, F., Prindle, D., Ratoff, P., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Cabenda, R., Schwarz, Andreas S., Sievers, D., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., Van de Walle, R. T., Vogel, H., Volland, U., Wacker, K., Cartacci, A., Walk, W. S., Wegener, H., Williams, D., Zschorsch, P., Crystal Ball Collaboration, Cavalli-Sforza, M., and Clare, R.

Subjects
+CHI%2FB%289895%29+PHOTON%22">UPSILON(10020) --> CHI/B(9895) PHOTON, +POSITRON+ELECTRON%22">UPSILON(9460) --> POSITRON ELECTRON, POTENTIAL [MODEL], +MUON%2B+MUON%22">UPSILON(9460) --> MUON+ MUON, SPIN [CHI/B(9895)], ANGULAR CORRELATION, 10.02 GEV-CMS, +UPSILON%289460%29+PHOTON%22">CHI/B(9895) --> UPSILON(9460) PHOTON, +UPSILON%289460%29+PHOTON%22">CHI/B(9915) --> UPSILON(9460) PHOTON, ddc:550, UPSILON(10020) [CASCADE DECAY], CHI/B(9915) [SPIN], UPSILON(10020) [ELECTROPRODUCTION], SPIN [CHI/B(9915)], EXPERIMENTAL RESULTS, DESY DORIS II STOR, UPSILON(10020) [RADIATIVE DECAY], HEAVY [QUARKONIUM], CHI/B(9895) [SPIN], COLLIDING BEAMS [ELECTRON POSITRON], ENERGY SPECTRUM [(PHOTON)], CASCADE DECAY [UPSILON(10020)], RADIATIVE DECAY [UPSILON(10020)], ELECTRON POSITRON [COLLIDING BEAMS], (PHOTON) [ENERGY SPECTRUM], ELECTRON POSITRON [ANNIHILATION], +CHI%2FB%289915%29+PHOTON%22">UPSILON(10020) --> CHI/B(9915) PHOTON, ANNIHILATION [ELECTRON POSITRON], ELECTROPRODUCTION [UPSILON(10020)], Crystal Ball
Abstract

Angular correlations in the cascade reaction e+e−→Υ(2S)→γχb, χb→γΥ, Υ→μ+μ− or Υ→e+e−, have been used for the first time to investigate the spins of the χb states. The results support the χb spins predicted by the potential models of heavy quarkonia.

Published
1987
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17. Measurement of the Properties of the eta' and Search For Other Resonances In Gamma-gamma -> eta pi0 pi0

Author

Antreasyan, D., Bartels, H. W., Besset, D., Bieler, C., Bienlein, J. K., Bizzeti, Andrea, Bloom, E. D., Brock, I., Brockmuller, K., Cabenda, R., Cartacci, A., Cavallisforza, M., Clare, R., Conforto, G., Cooper, S., Cowan, R., Coyne, D., Drews, G., Edwards, C., Engler, A., Fairfield, K. H., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Heimlich, F. H., Hofstadter, R., Irion, J., Jakubowski, Z., Karch, K., Keh, S., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Koch, W., Konig, A. C., Konigsmann, K., Kraemer, R. W., Kruger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Litke, A. M., Lockman, W., Lowe, S., Lurz, B., Marlow, D., Marsiske, H., Maschmann, W., Matsui, T., Mcbride, P., Messing, F., Metzger, W. J., Meyer, H., Monteleoni, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F. C., Prindle, D., Ratoff, P., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schwarz, A., Selonke, F., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., Vandewalle, R. T., Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., Williams, D., and Zschorsch, P.

Subjects
resonances, neutral mesons, Crystal Ball
Published
1987

18. The Michel Parameter For the Decay Tau -> e nu nubar

Author

Janssen, H., Antreasyan, D., Bartels, H. W., Besset, D., Bieler, C., Bienlein, J. K., Bizzeti, Andrea, Bloom, E. D., Brock, I., Brockmuller, K., Cabenda, R., Cartacci, A., Cavallisforza, 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., Karch, K., Keh, S., Kiel, T., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Koch, W., Konig, A. C., Konigsmann, K., Kramer, R. W., Kruger, 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., Schutte, J., Schwarz, A., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., Vanuitert, B., Vandewalle, R. T., Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., Williams, D. A., and Zschorsch, P.

Subjects
tau lepton, Michel parameter, Crystal Ball
Published
1989

19. Determination of Gamma-ee of the Upsilon(1S) and Upsilon(2S) Resonances, and Measurement of R At W = 9.39 GeV

Author

Jakubowski, Z., Antreasyan, D., Bartels, H. W., Besset, D., Bieler, C., Bienlein, J. K., Bizzeti, Andrea, Bloom, E. D., Brock, I., Brockmuller, K., Cabenda, R., Cartacci, A., Cavallisforza, 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., Konig, A. C., Konigsmann, K., Kraemer, R. W., Kruger, 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., Schutte, J., Schwarz, A., Selonke, F., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., Vanuitert, B., Vandewalle, R. T., Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., Williams, D., and Zschorsch, P.

Subjects
Upsilon(1S), partial decay width, e+e- cross sections, Crystal Ball
Published
1988

20. A Precision Measurement of the $\Upsilon^\prime$ Meson Mass

Author

Barber, D. P., Bremer, H. D., Drews, G., Gaiser, J., Godfrey, G., Leffler, S., Lockman, William S., Lowe, S., Wacker, K., Gelphman, D., Hofstadter, R., Kirkbride, I., Lee, Roger A., Hasemann, H., Litke, A., Matsui, T., Pollock, B., Tompkins, J., Folger, G., Lurz, B., Volland, U., Wegener, H., Cartacci, A., Conforto, G., Philipp, A., De Judicibus, D., Monteleoni, B., Pelfer, P. G., Fridman, A., Heimlich, F., Lekebusch, R., Lezoch, P., Maschmann, W., Nernst, R., Schwarz, Andreas S., Schmidt-Parzefall, W., Sievers, D., Strohbusch, U., Konig, A., Schotanus, J., Van de Walle, R. T., Walk, W., Keh, S., Kilian, H., Konigsmann, Kay, Scheer, M., Schroder, H., Schmitt, P., Aschman, D., ARGUS Collaboration, Ball, Crystal, Schulz, H. D., Selonke, F., Wurth, R., Drescher, A., Grawe, B., Kewisch, J., Hofmann, W., Markees, A., Matthiesen, U., Spengler, J., Wegener, D., Heller, R., Schubert, Klaus R., Stiewe, J., Waldi, R., Weseler, S., Lewin, H. C., Edwards, K., Frisken, William R., Fukunaga, C., Goddard, M., Kim, P., Orr, R. S., Patel, P. M., Prentice, J. D., Seywerd, H., Yoon, T. S., Limberg, T., Ammar, R., Coppage, D., Davis, R., Kwak, N., Bockmann, P., Jonsson, L., Oku, Y., Arefev, A., Danilov, M., Lyubimov, V., Mais, H., Matveev, V., Nagovitsyn, V., Semenov, Yu., Shevchenko, V., Soloshenko, V., Sopov, V., Chernyshev, V., Tikhomirov, I., Chistilin, V., Zaitsev, Yu., Ripken, G., Childers, R., Darden, C. W., Gennow, H., Edwards, C., Peck, C., Porter, F., Ratoff, P., Brock, I., Engler, A., Kraemer, R. W., Rossmanith, R., Marlow, Daniel R., Messing, F., Prindle, D., Renger, B., Rippich, C., Jakubowski, Z., Niczyporuk, B., Nowak, G., Skwarnicki, T., Bienlein, J. K., Schmidt, R., Cooper, S., Gomez, B., Kloiber, T., Koch, W., Schmitz, M., Trost, H. J., Zschorsch, P., Antreasyan, D., Irion, J., Strauch, K., Albrecht, H., Williams, D., Besset, D., Cabenda, R., Cavalli-Sforza, M., Cowan, R., Coyne, D., Newman-Holmes, C., Bloom, Elliott D., Chestnut, R., and Clare, R.

Subjects
ARGUS, MASS [UPSILON(10020)], UPSILON(10020) [MASS], 9.96-10.04 GEV-CMS, COLLIDING BEAMS [ELECTRON POSITRON], ELECTRON POSITRON [COLLIDING BEAMS], ELECTRON [POLARIZED BEAM], POSITRON [POLARIZED BEAM], MASS DIFFERENCE [UPSILON(10020) UPSILON(9460)], ELECTRON POSITRON [ANNIHILATION], POLARIZED BEAM [POSITRON], ANNIHILATION [ELECTRON POSITRON], HADRONIC [TOTAL CROSS SECTION], TOTAL CROSS SECTION [HADRONIC], ddc:530, ELECTROPRODUCTION [UPSILON(10020)], POLARIZED BEAM [ELECTRON], UPSILON(10020) [ELECTROPRODUCTION], UPSILON(10020) UPSILON(9460) [MASS DIFFERENCE], Crystal Ball, EXPERIMENTAL RESULTS, DESY DORIS II STOR
Published
1984
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21. Formation of the pseudoscalars pi 0, eta, and eta ' in the reaction gamma gamma --gamma gamma

Author

Williams, D. A., Antreasyan, D., Bartels, H. W., Besset, D., Bieler, C., Bienlein, J. K., Bizzeti, Andrea, Bloom, E. D., Brock, I., Brockmuller, K., Cabenda, R., Cartacci, A., Cavallisforza, M., Clare, R., Compagnucci, A., Conforto, G., Cooper, S., Cowan, R., Coyne, D., Drews, G., Engler, A., Fairfield, K. H., Folger, G., Fridman, A., Gaiser, J., Gelphman, D., Glaser, G., Godfrey, G., Heimlich, F. H., Hofstadter, R., Irion, J., Jakubowski, Z., Karch, K., Keh, S., Kilian, H., Kirkbride, I., Kloiber, T., Kobel, M., Koch, W., Konig, A. C., Konigsmann, K., Kraemer, R. W., Kruger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Lockman, W., Lowe, S., Lurz, B., Marlow, D., Marsiske, H., Maschmann, W., Mcbride, P., Messing, F., Metzger, W. J., Meyer, H., 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., Schutte, J., Schwarz, A., Selonke, F., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, H. J., Vandewalle, R. T., Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., and Zschorsch, P.

Subjects
gamma-gamma reaction, neutral mesons, Crystal Ball
Published
1988

22. Synchrotron radiation for transvenous coronary angiography

Author

Rubenstein, E., Brown, G. S., Harrison, D. C., Hofstadter, R., Hughes, E. B., Kernoff, R. S., Otis, J. N., Thompson, A. C., and Zeman, H. D.

Subjects
Dogs, Radiation, Coronary Circulation, Angiocardiography, Animals, Humans, Particle Accelerators, Coronary Angiography, Research Article
Published
1986

23. Experimental tests of quantum electrodynamics through the measurement of the reactions e+e-→e+e-, e+e-→γγ, and e+e-→μ+μ- at a center-of-mass energy of 5.2 GeV

Author

Beron, B.L. Crawford, J.F. Ford, R.L. Hofstadter, R. Hughes, E.B. Kose, R. LeCoultre, P. Martin, T.W. O'Neill, L.H. Rand, R.E. Schilling, R.F. Simpson, J.W. Resvanis, L.K.

Subjects
High Energy Physics::Experiment
Abstract

We report measurements of the reactions e+e-→e+e-, e+e-→γγ, and e+e-→μ+μ- at angles close to 90°, relative to Bhabha scattering, at a center-of-mass energy of 5.2 GeV. The results are found to be in agreement with the predictions of quantum electrodynamics. © 1978 The American Physical Society.

Published
1978

24. Observation of Three P States in the Radiative Decay of $\Upsilon( 2 S )$

Author

Nernst, R., Antreasyan, D., Clare, R., Conforto, G., Cooper, S., Cowan, R., Coyne, D., de Judicibus, D., Edwards, C., Engler, A., Folger, G., Fridman, A., Aschman, D., Gaiser, J., Gelphman, D., Godfrey, G., Heimlich, F. H., Hofstadter, R., Irion, J., Jakubowski, Z., Keh, S., Kilian, H., Kirkbride, I., Besset, D., Kloiber, T., Koch, W., König, A. C., Königsmann, K., Kraemer, R. W., Lee, R., Leffler, S., Lekebusch, R., Lezoch, P., Litke, A. M., Bienlein, J. K., Lockman, W., Lowe, S., Lurz, B., Marlow, D., Maschmann, W., Matsui, T., Messing, F., Metzger, W. J., Monteleoni, B., Newman-Holmes, C., Bloom, E. D., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, P. G., Pollock, B., Porter, F. C., Prindle, D., Ratoff, P., Renger, B., Rippich, C., Brock, I., Scheer, M., Schmitt, P., Schmitz, M., Schotanus, J., Schwarz, A., Sievers, D., Skwarnicki, T., Strauch, K., Strohbusch, U., Tompkins, J., Cabenda, R., Trost, H. -J., Van de Walle, R. T., Volland, U., Wacker, K., Walk, W., Wegener, H., Williams, D., Zschorsch, P., Crystal Ball Collaboration, Cartacci, A., and Cavalli-Sforza, M.

Subjects
ddc:550
Abstract

Physical review letters 54(20), 2195 - 2198 (1985). doi:10.1103/PhysRevLett.54.2195, Published by APS, College Park, Md.

Published
1985
Full Text
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27. ISOTOPE EFFECT IN CA40, CA44, AND CA48 CHARGE DISTRIBUTIONS FROM 250 MEV ELECTRON SCATTERING

Author

STANFORD UNIV CA HIGH ENERGY PHYSICS LAB, van Oostrum, K. J., Hofstadter, R., Noeldeke, G. K., Yearian, M. R., Clark, B. C., STANFORD UNIV CA HIGH ENERGY PHYSICS LAB, van Oostrum, K. J., Hofstadter, R., Noeldeke, G. K., Yearian, M. R., and Clark, B. C.

Abstract

The cross section for elastic electron scattering from an enriched Ca48 target is measured in comparison with one for Ca40. The angular dependence of the ratio of these two cross sections is fitted by a curve calculated by phase shift analysis. The best fitting values for the changes in the parameters defining the charge distributions of these nuclei lead to the conclusion that the half-way radius increases by 4.1% and the skin thickness decreases by 12.4%, under the assumption that the charge distribution of both nuclei follow the so- called parabolic Fermi model., Prepared in cooperation with General Motors Corp., Warren, Mich. Research Labs. and Illinois Univ., Urbana. Dept. of Physics.

Published
1966

28. Recent Applications of NaI(Tl) Total Absorption Counters

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Beron,B. L., Crawford,J. F., Ford,R. L., Hofstadter,R., Hughes,E. B., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Beron,B. L., Crawford,J. F., Ford,R. L., Hofstadter,R., and Hughes,E. B.

Abstract

In recent years NaI(Tl) total absorption counters (TASC and TANC varieties) have been described in numerous publications. Following the period of major technical developments of these detectors these counters have been applied to actual experiments in high energy physics. It is the purpose of this article to show how the total absorption technique fits into the fabric of modern high energy physics. Only the most recent applications is discussed.

Published
1973

29. MECHANICAL OSCILLATIONS INDUCED BY PENETRATING PARTICLES

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Beron,B. L., Boughn,S. P., Hamilton,W. O., Hofstadter,R., Martin,T. W., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Beron,B. L., Boughn,S. P., Hamilton,W. O., Hofstadter,R., and Martin,T. W.

Abstract

Investigations into the production of mechanical oscillations in aluminum cylinders by high energy electrons reveal that the mechanism of excitation is a 'hot rod model' in which the shower deposits heat in the bar and the hot zone expands causing mechanical vibrations. The conversion efficiency of this process is evaluated in these experiments. The hot rod mechanism does not present a significant background for gravitational events from cosmic rays in room temperature gravitational radiation detectors. (Author), Presented at the Scintillation and Semiconductor Conference, Washington, D. C. Mar 70.

Published
1970

30. X-RAY AND GAMMA-RAY STUDIES OF HIGH ENERGY ELECTRON SCATTERING EVENTS USING SEMICONDUCTOR DETECTORS

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Middleman,L. M., Ford,R. L., Hofstadter,R., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Middleman,L. M., Ford,R. L., and Hofstadter,R.

Abstract

Using high resolution semiconductor detectors, a study was made of the large K-ionization cross sections of atoms over a wide range of atomic numbers (Z = 29 to Z = 83) and of incident electron energies (E = 150 MeV to 900 MeV). For the higher Z elements (Z > 60) the L X-ray cross sections were also measured over the incident electron energy range. Ratios of the relative intensities of various distinct lines were determined and compared to recent low energy work. The results of the K-ionization experiment are compared to the recent relativistic calculations of H. Kolbenstvedt. A search for nuclear gamma-rays produced by high energy electron scattering was also undertaken in this work. No nuclear gamma-ray lines were detected. The null results were explained by recent theoretical calculations. (Author), Sponsored in part by National Science Foundation, Washington, D. C.

Published
1970

31. PROPERTIES OF A NaI(T1) TOTAL ABSORPTION SPECTROMETER FOR ELECTRONS AND Gamma-RAYS AT GeV ENERGIES

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Hughes,E. B., Ford,R. L., Hofstadter,R., O'Neill,L. H., Otis,J. N., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Hughes,E. B., Ford,R. L., Hofstadter,R., O'Neill,L. H., and Otis,J. N.

Abstract

In the past two years the authors have reported on the properties of large NaI(T1) crystals as total absorption spectrometers for electrons and gamma-rays in the range 0.1 to 14 GeV. They have recently made similar measurements on a NaI(T1) spectrometer which is both larger than any that they have used before, and assembled in a different way. The report describes the results of the initial tests. (Author), Presented at Scintillation and Semiconductor Counter Symposium (12th), Washington, D. C., 11-13 Mar 70.

Published
1970

32. GENERATION OF MECHANICAL VIBRATIONS BY PENETRATING PARTICLES

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Beron,B. L., Hofstadter,R., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Beron,B. L., and Hofstadter,R.

Abstract

Mechanical, or sound, vibrations were observed in ceramic piezoelectric disks of lead-zirconate-titanate (PZT) struck by high energy electrons. Four 1/2 inch thick disks of PZT were used. A wide band, low impedence, common base configuration amplifier was used to examine the induced vibrations. Since the most prominent resonant frequencies of the disks were near 40 kHz (radial mode) and 158 kHz (compressional mode) most of the studies were concentrated on these modes. Electrons of energy 1.00 BeV and 0.20 BeV were used in pulses, each lasting about 1.0 microsecond and contained 10,000 to 1,000,000 to electrons. The cross section of the incident 1.00 BeV beam was about 3 mm x 3 mm. (Author)

Published
1969

33. ON THE DESIGN OF NaI(T1) TOTAL ABSORPTION DETECTORS FOR STRONGLY INTERACTING PARTICLES AT GEV ENERGIES

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Hughes,E. B., Hofstadter,R., Lakin,W. L., Sick,I., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Hughes,E. B., Hofstadter,R., Lakin,W. L., and Sick,I.

Abstract

The properties of a large NaI(T1) detector as a total absorption detector for pions at GeV energies are reported. These observations are supplemented by measurements on the three-dimensional distribution of deposited energy in a large absorber of metallic tin by 8 GeV pions. The latter data are compared with existing Monte Carlo calculations of the nucleon-meson cascade and their application to the design of total absorption detectors with large containment factors is discussed. (Author)

Published
1969

34. ELECTRON SCATTERING STUDIES OF CALCIUM AND TITANIUM ISOTOPES

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Frosch,R. F., Hofstadter,R., McCarthy,J. S., Noldeke,G. K., van Oostrum.,K. J., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Frosch,R. F., Hofstadter,R., McCarthy,J. S., Noldeke,G. K., and van Oostrum.,K. J.

Abstract

Experimental results are presented on the scattering of 250 MeV electrons by Ca40, Ca42, Ca44, Ca48, and Ti48, and of 500 MeV electrons by Ca40 and Ca48. An analysis is made in terms of a phenomenological three-parameter shape, and a new, more accurate charge distribution is obtained for Ca40. The experiments also lead to a detailed exploration of the radial dependence of the differences in charge distributions of the various isotopes. Implications for nuclear theory are discussed. Comparison is made with the results of other electron scattering and of muonic x-ray experiments. The latter comparison permits an independent determination of an upper limit on the muon electromagnetic radius. (Author), Prepared in cooperation with General Motors Corp., Warren, Mich. Research Labs., and Illinois Univ., Urbana. Dept. of Physics. Sponsored in part by National Science Foundation.

Published
1968

35. A NAI(T1) TOTAL ABSORPTION DETECTOR FOR ELECTRONS AND GAMMA-RAYS AT GEV ENERGIES

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Hofstadter,R., Hughes,E. B., Lakin,W. L., Sick,I., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Hofstadter,R., Hughes,E. B., Lakin,W. L., and Sick,I.

Abstract

The paper reports a new and successful demonstration of the use of total absorption shower detectors for electrons and gamma-rays in the GeV energy range. Such detectors have the following attractive properties: (a) 100 per cent detection efficiency, (b) good energy resolution and (c) large dynamic range. Moreover, there is virtually no upper limit to the energy detectable by this means because the size of the detector varies only logarithmically with the energy of the incident electron or gamma-ray. (Author)

Published
1968

36. NEUTRON FORM FACTORS FROM INELASTIC ELECTRON SCATTERING IN TRITIUM AND HELIUM - 3

Author

HIGH ENERGY PHYSICS LAB STANFORD UNIV CALIF, Hughes, E. B., Yearian,M. R., Hofstadter,R., HIGH ENERGY PHYSICS LAB STANFORD UNIV CALIF, Hughes, E. B., Yearian,M. R., and Hofstadter,R.

Abstract

Measurements are reported of the inelastic scattering of electrons from the mirror nuclei of tritium and helium - 3. The ratio of the quasi-elastic electron-tritium and electron-helium -3 cross sections was measured to a precision of about 3% for values of the square of the four-momentum transfer, equal to 2.5 and 4.6/F sq. Detailed measurements of the shape of the entire inelastic spectra and estimates of the total inelastic cross sections were made. While these data are primarily intended to furnish additional experimental information which will be of use in determining the structure of the three-body nuclei, it is also pointed out that such data are a possible source of information on the structure of the neutron. (Author)

Published
1966

37. NEUTRON FORM FACTORS FROM A STUDY OF INELASTIC ELECTRON SPECTRA IN THE ELECTRODISINTEGRATION OF DEUTERIUM

Author

HIGH ENERGY PHYSICS LAB STANFORD UNIV CALIF, Hughes,E. B., Griffy,T. A., Hofstadter,R., Yearian,M. R., HIGH ENERGY PHYSICS LAB STANFORD UNIV CALIF, Hughes,E. B., Griffy,T. A., Hofstadter,R., and Yearian,M. R.

Abstract

Measurements of the ratio of the total inelastic electrondeuteron cross section to the elastic electron-proton cross section were made to an accuracy of about 3% for values of the square of the four-momentum transfer in the range 1.5 to 7.5/F-sq. These ratios were analyzed in terms of the form factors of the neutron using the 'area method', and it is concluded that the corrections necessary to the simple sum rule given by Jankus are approximately equal in magnitude to those encountered in the use of the more familiar 'peak method'. A detailed comparison was made between the shapes of the observed inelastic electrondeuteron cross sections as a function of the scattered electron momentum and the shapes expected according to a theoretical treatment due to Durand. (Author)

Published
1966

38. ELECTRON SCATTERING BY CALCIUM AT 250 MEV

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Croissiaux,M., hofstadter,R., Walker,A. E., Ravenhall,D. G., Clark,B. C., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Croissiaux,M., hofstadter,R., Walker,A. E., Ravenhall,D. G., and Clark,B. C.

Abstract

The doubly-magic nucleus of Ca(40) has been investigated by the electron scattering technique at an incident energy of 250 MeV. The elastic scattering behavior has been resolved from the inelastic scattering and absolute data on cross sections have been obtained for both types of events. In the case of the elastic scattering the first and second diffraction features have been observed and measured. It has been possible to make a comparison of the elastic data with theoretical calculations based on a phase shift analysis for certain assumed models of the nuclear charge density distribution. The combination of such an analysis with the present data, and also with earlier data on the same nucleus, permits the determination of the radius and skin thickness of the Ca(40) nucleus with a precision greater than has been attainable heretofore. An investigation of the dependence of the density distribution on a third parameter indicates that a Fermi distribution, or models close to this type, are required to fit the experimental data. A Fermi radial charge density distribution with radius c =3.60 F, and skin thickness t = 2.50 F fits the data extremely well. (Author), Supported in part by the Office of Naval Research, Washington, D. C. and the National Science Foundation, Washington, D. C.

Published
1964

39. PROTON FORM FACTORS FROM ELASTIC ELECTRON-PROTON SCATTERING

Author

STANFORD UNIV CA HIGH ENERGY PHYSICS LAB, Janssens, T., Hofstadter, R., Hughes, E. B., Yearian, M. R., STANFORD UNIV CA HIGH ENERGY PHYSICS LAB, Janssens, T., Hofstadter, R., Hughes, E. B., and Yearian, M. R.

Abstract

Absolute measurements of the elastic electron-proton cross section have been made with a precision of about 4% for values of the square of the four-momentum transfer, q to the second power, in the range 6.0 to 30.0 F to the minus second power and for electron scattering angles in the range 45 to 145 degrees. To within the experimental errors, it is found that the charge and magnetic form factors of the proton have a common dependence on q to the second power, when normalized to unity at 1 to the second power = 0, and than an accurate representation of the form factor behavior and that of the cross sections themselves can be given in terms of a three-pole approximation to the dispersion theory of nucleon form factors. (Author)

Published
1965

40. ELECTRON SCATTERING ON NUCLEONS AND NUCLEI

Author

STANFORD UNIV CA HIGH ENERGY PHYSICS LAB, Hofstadter, R., STANFORD UNIV CA HIGH ENERGY PHYSICS LAB, and Hofstadter, R.

Abstract

Presented at the 50th National Congress of the Italian Physical Society, 1964, Catania.

Published
1965

41. ELECTRON SCATTERING ON NUCLEONS, THREEBODY NUCLEI, AND CA40

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, HOFSTADTER,R., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, and HOFSTADTER,R.

Abstract

The experimental results of elastic scattering of electrons are given. The structure of protons and neutrons is studied using the form factor given by relativity theory, and the scattering amplitude of scattered electrons. Two mirror nuclei, Helium-3 and Hydrogen-3, are studied as examples of the three-body problem. The shape of the charge distribution of the nucleus of Ca40 is discussed.

Published
1964

42. NEUTRON FORM FACTORS FROM INELASTIC ELECTRON-DEUTRON SCATTERING

Author

STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Hughes,E. B., Griffy,T. A., Yearian,M. R., Hofstadter,R., STANFORD UNIV CALIF HIGH ENERGY PHYSICS LAB, Hughes,E. B., Griffy,T. A., Yearian,M. R., and Hofstadter,R.

Abstract

The electromagnetic form factors of the neutron have been measured in the q-squared range from 1.0 to 30.01/F sq. It is found that for values of q-squared greater than about 6.01/F sq the square of the neutron's charge form factor is consistent with zero to within an error of the order of 5% in the existing theoretical cross section. For values of q-squared less than 6.01/F sq it is concluded that meaningful values of the neutron form factors cannot be given until the necessary corrections to the theory are better understood. The present results on the neutron form factors are combined with recent measurements of the proton form factors to provide experimental determinations of the isotopic nucleon form factors. It is found that the omega and phi mesons provide a good approximation to the observed isoscalar form factors but that it is difficult to understand the behavior of the isovector form factors in terms of the rho meson alone. (Author)

Published
1965

44. ANALYSIS OF THE ETA-PI-0-PI-O FINAL-STATE IN PHOTON-PHOTON COLLISIONS

Author

Karch, K., Antreasyan, D., Bartels, Hw, Besset, D., Bieler, C., Bienlein, Jk, Bizzeti, A., Bloom, Ed, Brock, I., Brockmuller, K., Cabenda, R., Cartacci, A., Cavallisforza, 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, Fh, Heinsius, Fh, Hofstadter, R., Irion, J., Jakubowski, Z., Janssen, H., Keh, S., Kiel, T., Kilian, H., Kirkbride, I., Koiber, T., Kobel, M., Koch, W., Konig, Ac, Konigsmann, K., Kraemer, Rw, Kruger, S., Landi, G., Lee, R., Leffler, S., Lekebusch, R., Tadeusz Lesiak, Litke, Am, Lockman, W., Lowe, S., Lurz, B., Marlow, D., Marsiske, H., Maschmann, W., Mcbride, P., Messing, F., Metzger, Wj, Meyer, H., Monteleoni, B., Muryn, B., Nernst, R., Niczyporuk, B., Nowak, G., Peck, C., Pelfer, Pg, Pollock, B., Porter, Fc, Prindle, D., Ratoff, P., Reidenbach, M., Renger, B., Rippich, C., Scheer, M., Schmitt, P., Schotanus, J., Schutte, J., Schwarz, A., Sievers, D., Skwarnicki, T., Stock, V., Strauch, K., Strohbusch, U., Tompkins, J., Trost, Hj, Vanuitert, B., Vandewalle, Rt, Vogel, H., Voigt, A., Volland, U., Wachs, K., Wacker, K., Walk, W., Wegener, H., Williams, Da, and Zschorsch, P.

Subjects
gamma-gamma reaction, neutral mesons, Crystal Ball

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