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8 results on '"B. TERBURG"'

1. Electroproduction of kaons on light nuclei

Author

R. Sawafta, J. H. Liu, John C. Mitchell, T. Eden, C. Yan, D. G. Meekins, E. Christy, F. Dohrmann, P. Ambrozewicz, L. Cole, M. Sarsour, A. Ahmidouch, Y. Sato, P. E. Reimer, S. Tajima, J. A. Dunne, J. Roche, S. Danagoulian, Kevin Bailey, B. Mueller, J. W. Price, W. Hinton, N. S. Chant, H. Mkrtchyan, J. Crowder, H. Juengst, Haiyan Gao, John Arrington, G. Savage, C. Cothran, J. P. Schiffer, B. Zihlmann, M. Zeier, H. C. Fenker, J.-O. Hansen, Paul Gueye, Rolf Ent, R. D. Carlini, Brian Raue, R. Asaturyan, L. Gan, W. J. Cummings, A. Semenov, D. F. Geesaman, J. Cha, D. S. Brown, M. Elaasar, A. Cochran, H. Breuer, Dipangkar Dutta, Pete Markowitz, L. Yuan, J. Reinhold, H. Bitao, A. Uzzle, K. Gustafsson, B. Terburg, F. Duncan, S. Stepanyan, P. G. Roos, Ketevi Assamagan, Avraham Klein, G. Collins, Thomas O'Neill, D. Potterveld, V. Tadevosian, K. Garrow, H. E. Jackson, D. Koltenuk, C. S. Armstrong, Y. Liang, O. K. Baker, I. Niculescu, B. Zeidman, A. F. Lung, G. Niculescu, Toshinobu Miyoshi, H. Yamaguchi, R. Madey, D. Abbott, L. Ewell, H. T. Fortune, Y. Fujii, K. Hafidi, R. E. Segel, S. Beedoe, S. Mtingwa, C. J. Martoff, R. Mohring, C. E. Keppel, S. A. Wood, D. J. Mack, Stephen Avery, and L. G. Tang

Subjects
Physics, Nuclear and High Energy Physics, Meson, Proton, Helium-3, Hadron, Production (computer science), Elementary particle, Atomic physics, Nuclear Experiment, Lambda, Isotopes of helium
Abstract

The A(e,e{prime}K{sup +})YX reaction on H, D, {sup 3}He, and {sup 4}He was investigated in Hall C at CEBAF. Data were obtained for Q{sup 2} {approx} 0.35 and 0.5 GeV{sup 2} at 3.245 GeV. The missing mass spectra for both H and D are fitted with Monte-Carlo simulations incorporating peaks corresponding to {Lambda} production on the proton and {Sigma} production on both the proton and neutron. For D, the cross section ratio {Sigma}{sup 0}/{Sigma}{sup {minus}} {approx} 2, and excess yield close to the thresholds for {Lambda} and {Sigma} production can be attributed to final-state interactions that are compared to the data. The analysis of the data for the He targets is in a more preliminary state with broader quasi-free peaks resulting from the higher Fermi momenta. Evidence for bound {Lambda}-hypernuclear states is seen and other structure may be present.

Published
2001

2. Electroproduction of kaons and light hypernuclei

Author

John C. Mitchell, Y. Liang, T. Eden, Thomas O'Neill, D. F. Geesaman, R. E. Segel, L. Ewell, J. Cha, H. Bitao, E. Christy, Ketevi Assamagan, M. Sarsour, J. Crowder, L. Cole, J. W. Price, S. Danagoulian, Dipangkar Dutta, H. Juengst, H. Yamaguchi, H.T. Fortune, D. Koltenuk, N. Chant, J. H. Liu, D. Abbott, R. Asaturyan, D. G. Meekins, W. Hinton, T. Miyoshi, J. Roche, Brian Raue, Paul Gueye, W. U. Boeglin, J. Reinhold, Pete Markowitz, J.-O. Hansen, L. G. Tang, R. Mohring, R. Sawafta, K. Garrow, J. P. Schiffer, C. E. Keppel, C. J. Martoff, C. Cothran, John Arrington, Kevin Bailey, C. Yan, B. Zihlmann, H. C. Fenker, B. Terburg, C. S. Armstrong, P. Roos, Y. Sato, Rolf Ent, S. Tajima, B. Mueller, P. Ambrozewicz, G. Savage, S. Stepanyan, D. S. Brown, A. Uzzle, O. K. Baker, Avraham Klein, A. Cochran, H. Mkrtchyan, A. Semenov, L. Gan, W. J. Cummings, G. Collins, F. Duncan, K. Gustafsson, F. Dohrmann, Y. Fujii, R. Madey, M. Zeier, J. A. Dunne, A. Ahmidouch, R. D. Carlini, S. A. Wood, A. F. Lung, D. J. Mack, L. Yuan, S. Beedoe, M. Elaasar, Stephen Avery, G. Niculescu, I. Niculescu, D. Potterveld, V. Tadevosian, S. Mtingwa, H. Breuer, K. Hafidi, Haiyan Gao, H. E. Jackson, P. E. Reimer, B. Zeidman, and (Astro)-Particles Physics

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Deuterium, Production (computer science), Electron, Nucleon, Fundamental interaction
Abstract

A detailed investigation of the basic hyperon-nucleon interactions in nuclei is one of the aims of Experiment 91-016, approved with high priority at CEBAF, to study the electroproduction of kaons on targets of deuterium, {sup 3}He, and {sup 4}He. Inasmuch as both the electron and K{sup +} are particles that interact relatively weakly with nucleons, electroproduction of light hypernuclei provides a low-distortion method for investigating the fundamental interactions between nucleons, {Alpha}`s, and {Epsilon}`s in few-body systems. In particular, the (e,e`K{sup +}) reactions on cryogenic targets of D, {sup 3}He, and {sup 4}He will be studied at incident electron energies near 3 GeV with coincident detection of the emergent e and K{sup +} in the HMS and SOS magnetic spectrometers in Hall C. Construction of the He target, operating at {approximately}10 atm, {approximately}50 K and capable of dissipating {approximately}30 W, is expected to be complete prior to commencement of production runs in Hall C. The first data runs for E91-016, expected to begin late in FY 1995, will also be the basis for a doctoral thesis at Hampton University. In addition to providing new information on the phases of hyperon-nucleon interactions, measurements of cross sections for hypernuclear formation, and interference phenomena,more » the data may provide evidence for the presence of bound {Epsilon}`s and strange di-baryonic states that are the subject of considerable theoretical discussion.« less

Published
2001

3. Near threshold electroproduction of theωmeson atQ2≈0.5GeV2

Author

L. Ewell, J. Arrington, D. Abbott, S. Danagoulian, J. A. Dunne, John C. Mitchell, D. G. Meekins, Brian Raue, T. Eden, J.-O. Hansen, J. Reinhold, H. Mkrtchyan, H. T. Fortune, Dipanwita Dutta, L. G. Tang, V. Tadevosyan, Oliver Keith Baker, R. Sawafta, G. Niculescu, C. Cothran, Richard Madey, B. Zihlmann, D. H. Potterveld, Kevin Bailey, B. Zeidman, Ketevi Assamagan, R. D. Carlini, Andreas Klein, Donal Day, B. Terburg, J. W. Price, Pete Markowitz, J. Cha, C. Yan, C. S. Armstrong, W. J. Cummings, D. Koltenuk, A. Ahmidouch, K. Gustafsson, F. Duncan, G. Collins, Thomas O'Neill, I. Niculescu, Rolf Ent, G. Savage, Haiyan Gao, W. Hinton, Paul Gueye, D. F. Geesaman, S. A. Wood, S. Stepanyan, P. G. Roos, H. Breuer, D. J. Mack, C. E. Keppel, R. E. Segel, R. Mohring, S. Beedoe, S. Mtingwa, P. Ambrozewicz, and C. J. Martoff

Subjects
Physics, Nuclear and High Energy Physics, Angular range, Particle physics, Photon, Meson production, Meson, 010308 nuclear & particles physics, Parity (physics), 01 natural sciences, Omega, Nuclear physics, Near threshold, Angular distribution, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract

Electroproduction of the {omega} meson was investigated in the {sup 1}H(e,e{sup '}p){omega} reaction. The measurement was performed at a four-momentum transfer Q{sup 2}{approx_equal}0.5 GeV{sup 2}. Angular distributions of the virtual photon-proton center-of-momentum cross sections have been extracted over the full angular range. These distributions exhibit a strong enhancement over t-channel parity exchange processes in the backward direction. According to a newly developed electroproduction model, this enhancement provides significant evidence of resonance formation in the {gamma}*p{yields}{omega}p reaction channel.

Published
2004

4. Quasielastic(e,e′p)reaction onC12,Fe56, andAu197

Author

D. Dutta, D. van Westrum, D. Abbott, A. Ahmidouch, Ts. A. Amatuoni, C. Armstrong, J. Arrington, K. A. Assamagan, K. Bailey, O. K. Baker, S. Barrow, K. Beard, D. Beatty, S. Beedoe, E. Beise, E. Belz, C. Bochna, P. E. Bosted, H. Breuer, E. E. W. Bruins, R. Carlini, J. Cha, N. Chant, C. Cothran, W. J. Cummings, S. Danagoulian, D. Day, D. DeSchepper, J.-E. Ducret, F. Duncan, J. Dunne, T. Eden, R. Ent, H. T. Fortune, V. Frolov, D. F. Geesaman, H. Gao, R. Gilman, P. Guèye, J. O. Hansen, W. Hinton, R. J. Holt, C. Jackson, H. E. Jackson, C. Jones, S. Kaufman, J. J. Kelly, C. Keppel, M. Khandaker, W. Kim, E. Kinney, A. Klein, D. Koltenuk, L. Kramer, W. Lorenzon, A. Lung, K. McFarlane, D. J. Mack, R. Madey, P. Markowitz, J. Martin, A. Mateos, D. Meekins, M. A. Miller, R. Milner, J. Mitchell, R. Mohring, H. Mkrtchyan, A. M. Nathan, G. Niculescu, I. Niculescu, T. G. O’Neill, D. Potterveld, J. W. Price, J. Reinhold, C. Salgado, J. P. Schiffer, R. E. Segel, P. Stoler, R. Suleiman, V. Tadevosyan, L. Tang, B. Terburg, T. P. Welch, C. Williamson, S. Wood, C. Yan, J.-C. Yang, J. Yu, B. Zeidman, W. Zhao, and B. Zihlmann

Subjects
Physics, Nuclear and High Energy Physics, Mathematical physics
Published
2003

5. Measurement of longitudinal and transverse cross sections in the3He(e,e′π+)3Hreaction atW=1.6 GeV

Author

J. Cha, Dipangkar Dutta, I. Niculescu, D. McKee, V. Tadevosyan, B. Mueller, Kevin Bailey, J. Arrington, B. Beise, P. Ambrozewicz, B. Zihlmann, D. Schepper, S. A. Wood, H. Breuer, J. A. Dunne, Toshiyuki Takahashi, H. Mkrtchyan, B. Terburg, R. D. Carlini, L. Gan, D. J. Mack, Paul Gueye, L. G. Tang, D. H. Potterveld, D. F. Geesaman, Ketevi Assamagan, Stephen Avery, R. Sawafta, R. E. Segel, N. S. Chant, John C. Mitchell, T. P. Welch, S. Stepanyan, P. G. Roos, D. Gaskell, V. Papavassiliou, C. Jackson, G. Hofman, B. Zeidman, Thomas O'Neill, C. E. Keppel, C. Glashausser, A. Lung, M. Harvey, J. Reinhold, Rolf Ent, D. Koltenuk, D. S. Brown, S. Beedoe, A. Gasparian, J. Volmer, A. A. Cowley, Osamu Hashimoto, H. E. Jackson, O. K. Baker, H. Anklin, A. Ahmidouch, L. Yuan, E. R. Kinney, D. van Westrum, S. Danagoulian, G. Niculescu, W. Hinton, and Ronald Gilman

Subjects
Physics, Nuclear and High Energy Physics, Meson production, Photon, Nuclear Theory, Virtual particle, Polarization (waves), Nuclear physics, Transverse plane, Pion, Pi, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Nucleon
Abstract

The coherent 3He(e,e{pi}+)3H reaction was measured at Q2 = 0.4 (GeV/c)2 and W = 1.6 GeV for two values of the virtual photon polarization, {epsilon}, allowing the separation of longitudinal and transverse cross sections. The results from the coherent process on 3He were compared to H(e,e{pi}+)n data taken at the same kinematics. This marks the first direct comparison of these processes. At these kinematics (p{pi} = 1.1 GeV/c), pion rescattering from the spectator nucleons in the 3He(e,e{pi}+)3H process is expected to be small, simplifying the comparison to {pi}+ production from the free proton.

Published
2001

6. xandξscaling of the nuclear structure function at largex

Author

J. Zhao, D. Koltenuk, Ingo Sick, C. E. Keppel, W. F. Vulcan, B. Zihlmann, D. G. Crabb, A. Honegger, Curtis Smith, B. Bray, J. Jourdan, G. Niculescu, B. W. Filippone, Dipangkar Dutta, Donal Day, J. H. Mitchell, B. Terburg, C. S. Armstrong, J. Arrington, T. Averett, James McCarthy, G. Collins, J. Jensen, R. A. Lindgren, A. Lung, R. D. Carlini, O. Rondon, I. Niculescu, S. A. Wood, W.U. Boeglin, C. Cothran, D. J. Mack, T. Petitjean, R. D. McKeown, C. Yan, H. Mkrtchyan, Oliver Keith Baker, L.J. de Bever, J. A. Dunne, D. G. Meekins, C. Bochna, E. W. Hughes, and Rolf Ent

Subjects
Physics, Momentum, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Scattering, Momentum transfer, Nuclear structure, Inelastic scattering, Nuclear Experiment, Nucleon, Electron scattering, Scaling
Abstract

Inclusive electron scattering data are presented for ^2H, C, Fe, and Au targets at an incident electron energy of 4.045 GeV for a range of momentum transfers from Q^2=1 to 7 (GeV/c)^2. Data were taken at Jefferson Laboratory for low values of energy loss, corresponding to values of Bjorken x ≳ 1. The structure functions do not show scaling in x in this range, where inelastic scattering is not expected to dominate the cross section. The data do show scaling, however, in the Nachtmann variable ξ. This scaling appears to be the result of Bloom- Gilman duality in the nucleon structure function combined with the Fermi motion of the nucleons in the nucleus. The resulting extension of scaling to larger values of ξ opens up the possibility of accessing nuclear structure functions in the high-x region at lower values of Q^2 than previously believed.

Published
2001

7. Separated spectral functions for the quasifree12C(e,e′p)reaction

Author

R. E. Segel, W. Kim, K. Beard, R. Mohring, A.O. Mateos, D. van Westrum, S. A. Wood, J. C. Yang, S. Barrow, P. Stoler, C. E. Keppel, M. A. Khandaker, John C. Mitchell, C. Jackson, L. G. Tang, S. Danagoulian, T. Eden, Gabriel Niculescu, R. J. Sutter, D. Abbott, R. Sawafta, H. T. Fortune, C. Bochna, Alan M. Nathan, J. Yu, P. E. Bosted, I. Niculescu, O. K. Baker, Ketevi Assamagan, J. W. Martin, Donal Day, B. Terburg, T. P. Welch, E. R. Kinney, J. Reinhold, A. Ahmidouch, V. Tadevosyan, D. Beatty, Kevin Bailey, Ross Milner, E. Meier, C. Cothran, Ts A. Amatuni, E. Belz, Paul Gueye, R. E. Chrien, B. Zihlmann, D. F. Geesaman, Avraham Klein, C. Salgado, H. Breuer, Wolfgang Lorenzon, J. Arrington, D. DeSchepper, J.-E. Ducret, J. A. Dunne, J.-O. Hansen, D. G. Meekins, J. P. Schiffer, W. Hinton, R. Suleiman, E. J. Beise, S. B. Kaufman, Rolf Ent, H. E. Jackson, C. Yan, R. Madey, C. F. Williamson, V. Frolov, H. Mkrtchyan, R. D. Carlini, R. J. Holt, D. H. Potterveld, J. W. Price, W. Zhao, J. Cha, James J. Kelly, Ronald Gilman, Dipangkar Dutta, N. S. Chant, C. S. Armstrong, Pete Markowitz, E. E.W. Bruins, K. McFarlane, David Mack, S. Beedoe, C. E. Jones, L. H. Kramer, Thomas O'Neill, M. A. Miller, F. Duncan, Haiyan Gao, W. J. Cummings, D. Koltenuk, and B. Zeidman

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Missing energy, Proton, Nuclear Theory, Momentum transfer, Nuclear physics, Momentum, Parallel kinematics, Transverse plane, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, Nucleon
Abstract

A separation of the longitudinal and transverse 12 C(e, e8p) cross sections in the quasifree region has been performed in parallel kinematics at Q 2 of 0.64 and 1.8 GeV 2 for initial proton momentum ,80 MeV. The separated transverse and longitudinal spectral functions at Q 2 50.64 GeV 2 show significant differences for missing energy between 25 and 60 MeV indicating a breakdown in the single nucleon knockout picture. The transverse spectral functions exhibit definite momentum transfer dependence.

Published
2000

8. Coherentπ0photoproduction on the deuteron up to 4 GeV

Author

M. Witkowski, R. E. Segel, D. H. Potterveld, H. Breuer, C. Bochna, B. Zeidman, Ronald Ransome, D. G. Meekins, J. Cha, G. Collins, S. Barrow, R. Mohring, Thomas O'Neill, P. Stoler, Dipangkar Dutta, V. Frolov, S. F. Pate, H. Mkrtchyan, H. T. Fortune, E. J. Beise, D. Abbott, S. A. Wood, P. M. Rutt, J.-O. Hansen, N. Simicevic, C. S. Armstrong, Alan M. Nathan, R. Madey, Pete Markowitz, E. R. Kinney, R. Suleiman, David Mack, D. Beatty, C. Cothran, L. G. Tang, C. E. Keppel, W. Hinton, P. E. Bosted, I. Niculescu, S. E. Williamson, Haiyan Gao, R. V. Cadman, B. W. Filippone, J. Reinhold, O. K. Baker, W. F. Vulcan, Douglas H Beck, L. Cardman, Ronald Gilman, G. J. Kumbartzki, J. A. Dunne, R. D. McKeown, T. Eden, R. D. Carlini, A. Ahmidouch, M. Harvey, K. McFarlane, J. H. Mitchell, R. J. Holt, M. Khandaker, Ketevi Assamagan, Paul Gueye, A. F. Lung, C. Salgado, M. A. Miller, D. F. Geesaman, F. Duncan, G. Rakness, G. Savage, J. W. Price, J. Napolitano, B. Terburg, D. van Westrum, H. E. Jackson, B. R. Owen, S. Danagoulian, Gabriel Niculescu, Rolf Ent, C. Yan, Z. E. Meziani, J. Arrington, K. Gustafsson, E. J. Brash, D. Koltenuk, J. E. Belz, S. Beedoe, W. J. Cummings, T. A. Forest, N. S. Chant, and Avraham Klein

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Amplitude, Pion, Photon, Meson, Scattering, Hadron, Elementary particle, Photon energy, Nuclear Experiment
Abstract

The differential cross section for ^2H(γ,d)π^0 has been measured at deuteron center-of-mass angles of 90° and 136°. This work reports the first data for this reaction above a photon energy of 1 GeV, and permits a test of the apparent constituent counting rule and reduced nuclear amplitude behavior as observed in elastic ed scattering. Measurements were performed up to a photon energy of 4.0 GeV, and are in good agreement with previous lower energy measurements. Overall, the data are inconsistent with both constituent-counting rule and reduced nuclear amplitude predictions.

Published
1999

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