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129 results on '"Meer, R. L. J."'

1. Separated Response Functions in Exclusive, Forward $\pi^{\pm}$ Electroproduction on Deuterium

Author

Huber, G. M., Blok, H. P., Butuceanu, C., Gaskell, D., Horn, T., Mack, D. J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Beise, E. J., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E. F., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tadevosyan, V., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zhao, W. -X., Zheng, X., Zihlmann, B., and Collaboration, The Jefferson Lab Fpi

Subjects
Nuclear Experiment
Abstract

Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, $Q^2$, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in $\pi^-$ and $\pi^+$ electroproduction are particularly informative. The ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data. Method: Data were acquired with 2.6-5.2 GeV electron beams and the HMS+SOS spectrometers in Jefferson Lab Hall C, at central $Q^2$ values of 0.6, 1.0, 1.6 GeV$^2$ at W=1.95 GeV, and $Q^2$=2.45 GeV$^2$ at W=2.22 GeV. There was significant coverage in $\phi$ and $\epsilon$, which allowed separation of $\sigma_{L,T,LT,TT}$. Results: $\sigma_L$ shows a clear signature of the pion pole, with a sharp rise at small -t. In contrast, $\sigma_T$ is much flatter versus t. The longitudinal/transverse ratios evolve with $Q^2$ and t, and at the highest $Q^2$=2.45 GeV$^2$ show a slight enhancement for $\pi^-$ production compared to $\pi^+$. The $\pi^-/\pi^+$ ratio for transverse photons exhibits only a small $Q^2$-dependence, following a nearly universal curve with t, with a steep transition to a value of about 0.25, consistent with s-channel quark knockout. The $\sigma_{TT}/\sigma_T$ ratio also drops rapidly with $Q^2$, qualitatively consistent with s-channel helicity conservation. The $\pi^-/\pi^+$ ratio for longitudinal photons indicates a small isoscalar contamination at W=1.95 GeV, consistent with what was observed in our earlier determination of the pion form factor at these kinematics., Comment: 25 pages, 16 figures, 6 tables

Published
2014
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2. Separated Response Function Ratios in Exclusive, Forward pi^{+/-} Electroproduction

Author

Huber, G. M., Blok, H. P., Butuceanu, C., Gaskell, D., Horn, T., Mack, D. J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Beise, E. J., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E. F., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tadevosyan, V., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zhao, W. -X., Zheng, X., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

The study of exclusive $\pi^{\pm}$ electroproduction on the nucleon, including separation of the various structure functions, is of interest for a number of reasons. The ratio $R_L=\sigma_L^{\pi^-}/\sigma_L^{\pi^+}$ is sensitive to isoscalar contamination to the dominant isovector pion exchange amplitude, which is the basis for the determination of the charged pion form factor from electroproduction data. A change in the value of $R_T=\sigma_T^{\pi^-}/\sigma_T^{\pi^+}$ from unity at small $-t$, to 1/4 at large $-t$, would suggest a transition from coupling to a (virtual) pion to coupling to individual quarks. Furthermore, the mentioned ratios may show an earlier approach to pQCD than the individual cross sections. We have performed the first complete separation of the four unpolarized electromagnetic structure functions above the dominant resonances in forward, exclusive $\pi^{\pm}$ electroproduction on the deuteron at central $Q^2$ values of 0.6, 1.0, 1.6 GeV$^2$ at $W$=1.95 GeV, and $Q^2=2.45$ GeV$^2$ at $W$=2.22 GeV. Here, we present the $L$ and $T$ cross sections, with emphasis on $R_L$ and $R_T$, and compare them with theoretical calculations. Results for the separated ratio $R_L$ indicate dominance of the pion-pole diagram at low $-t$, while results for $R_T$ are consistent with a transition between pion knockout and quark knockout mechanisms., Comment: 6 pages, 3 figures

Published
2014
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3. Virtual Compton Scattering and the Generalized Polarizabilities of the Proton at Q^2=0.92 and 1.76 GeV^2

Author

Fonvieille, H., Laveissiere, G., Degrande, N., Jaminion, S., Jutier, C., Todor, L., Di Salvo, R., Van Hoorebeke, L., Alexa, L. C., Anderson, B. D., Aniol, K. A., Arundell, K., Audit, G., Auerbach, L., Baker, F. T., Baylac, M., Berthot, J., Bertin, P. Y., Bertozzi, W., Bimbot, L., Boeglin, W. U., Brash, E. J., Breton, V., Breuer, H., Burtin, E., Calarco, J. R., Cardman, L. S., Cavata, C., Chang, C. -C., Chen, J. -P., Chudakov, E., Cisbani, E., Dale, D. S., deJager, C. W., De Leo, R., Deur, A., d'Hose, N., Dodge, G. E., Domingo, J. J., Elouadrhiri, L., Epstein, M. B., Ewell, L. A., Finn, J. M., Fissum, K. G., Fournier, G., Frois, B., Frullani, S., Furget, C., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Grenier, P., Guichon, P. A. M., Hansen, J. O., Holmes, R., Holtrop, M., Howell, C., Huber, G. M., Hyde, C. E., Incerti, S., Iodice, M., Jardillier, J., Jones, M. K., Kahl, W., Kato, S., Katramatou, A. T., Kelly, J. J., Kerhoas, S., Ketikyan, A., Khayat, M., Kino, K., Kox, S., Kramer, L. H., Kumar, K. S., Kumbartzki, G., Kuss, M., Leone, A., LeRose, J. J., Liang, M., Lindgren, R. A., Liyanage, N., Lolos, G. J., Lourie, R. W., Madey, R., Maeda, K., Malov, S., Manley, D. M., Marchand, C., Marchand, D., Margaziotis, D. J., Markowitz, P., Marroncle, J., Martino, J., McCormick, K., McIntyre, J., Mehrabyan, S., Merchez, F., Meziani, Z. E., Michaels, R., Miller, G. W., Mougey, J. Y., Nanda, S. K., Neyret, D., Offermann, E. A. J. M., Papandreou, Z., Pasquini, B., Perdrisat, C. F., Perrino, R., Petratos, G. G., Platchkov, S., Pomatsalyuk, R., Prout, D. L., Punjabi, V. A., Pussieux, T., Quemener, G., Ransome, R. D., Ravel, O., Real, J. S., Renard, F., Roblin, Y., Rowntree, D., Rutledge, G., Rutt, P. M., Saha, A., Saito, T., Sarty, A. J., Serdarevic, A., Smith, T., Smirnov, G., Soldi, K., Sorokin, P., Souder, P. A., Suleiman, R., Templon, J. A., Terasawa, T., Tieulent, R., Tomasi-Gustaffson, E., Tsubota, H., Ueno, H., Ulmer, P. E., Urciuoli, G. M., Vanderhaeghen, M., Van der Meer, R. L. J., Van De Vyver, R., Vernin, P., Vlahovic, B., Voskanyan, H., Voutier, E., Watson, J. W., Weinstein, L. B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B. B., Zainea, D. G., Zhang, W. -M., Zhao, J., and Zhou, Z. -L.

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

Virtual Compton Scattering (VCS) on the proton has been studied at Jefferson Lab using the exclusive photon electroproduction reaction (e p --> e p gamma). This paper gives a detailed account of the analysis which has led to the determination of the structure functions P_LL-P_TT/epsilon and P_LT, and the electric and magnetic generalized polarizabilities (GPs) alpha_E(Q^2) and beta_M(Q^2) at values of the four-momentum transfer squared Q^2= 0.92 and 1.76 GeV^2. These data, together with the results of VCS experiments at lower momenta, help building a coherent picture of the electric and magnetic GPs of the proton over the full measured Q^2-range, and point to their non-trivial behavior., Comment: version 2: modified according to PRC Editor's and Referee's recommendations. Archival paper for the E93-050 experiment at JLab Hall A. 28 pages, 23 figures, 5 cross-section tables. To be submitted to Phys.Rev.C

Published
2012
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4. Charged pion form factor between $Q^2$=0.60 and 2.45 GeV$^2$. I. Measurements of the cross section for the ${^1}$H($e,e'\pi^+$)$n$ reaction

Author

Blok, H. P., Horn, T., Huber, G. M., Beise, E. J., Gaskell, D., Mack, D. J., Tadevosyan, V., Volmer, J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zhao, W. -X., Zheng, X., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

Cross sections for the reaction ${^1}$H($e,e'\pi^+$)$n$ were measured in Hall C at Thomas Jefferson National Accelerator Facility (JLab) using the CEBAF high-intensity, continous electron beam in order to determine the charged pion form factor. Data were taken for central four-momentum transfers ranging from $Q^2$=0.60 to 2.45 GeV$^2$ at an invariant mass of the virtual photon-nucleon system of $W$=1.95 and 2.22 GeV. The measured cross sections were separated into the four structure functions $\sigma_L$, $\sigma_T$, $\sigma_{LT}$, and $\sigma_{TT}$. The various parts of the experimental setup and the analysis steps are described in detail, including the calibrations and systematic studies, which were needed to obtain high precision results. The different types of systematic uncertainties are also discussed. The results for the separated cross sections as a function of the Mandelstam variable $t$ at the different values of $Q^2$ are presented. Some global features of the data are discussed, and the data are compared with the results of some model calculations for the reaction ${^1}$H($e,e'\pi^+$)$n$., Comment: 26 pages, 23 figures

Published
2008
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5. Charged pion form factor between Q^2=0.60 and 2.45 GeV^2. II. Determination of, and results for, the pion form factor

Author

Huber, G. M., Blok, H. P., Horn, T., Beise, E. J., Gaskell, D., Mack, D. J., Tadevosyan, V., Volmer, J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Gibson, E., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Kiang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zhao, W. -X., Zheng, X., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

The charged pion form factor, Fpi(Q^2), is an important quantity which can be used to advance our knowledge of hadronic structure. However, the extraction of Fpi from data requires a model of the 1H(e,e'pi+)n reaction, and thus is inherently model dependent. Therefore, a detailed description of the extraction of the charged pion form factor from electroproduction data obtained recently at Jefferson Lab is presented, with particular focus given to the dominant uncertainties in this procedure. Results for Fpi are presented for Q^2=0.60-2.45 GeV^2. Above Q^2=1.5 GeV^2, the Fpi values are systematically below the monopole parameterization that describes the low Q^2 data used to determine the pion charge radius. The pion form factor can be calculated in a wide variety of theoretical approaches, and the experimental results are compared to a number of calculations. This comparison is helpful in understanding the role of soft versus hard contributions to hadronic structure in the intermediate Q^2 regime., Comment: 18 pages, 11 figures

Published
2008
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6. Determination of the pion charge form factor for Q^2=0.60-1.60 GeV^2

Author

collaboration, The Fpi-1, Tadevosyan, V., Blok, H. P., Huber, G. M., Abbott, D., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Bochna, C., Brash, E. J., Breuer, H., Chant, N., Dunne, J., Eden, T., Ent, R., Gaskell, D., Gilman, R., Gustafsson, K., Hinton, W., Jackson, H., Jones, M. K., Keppel, C., Kim, P. H., Kim, W., Klein, A., Koltenuk, D., Liang, M., Lolos, G. J., Lung, A., Mack, D. J., McKee, D., Meekins, D., Mitchell, J., Mkrtchyan, H., Mueller, B., Niculescu, G. Niculescu I., Pitz, D., Potterveld, D., Qin, L. M., Reinhold, J., Shin, I. K., Stepanyan, S., Tang, L. G., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Volmer, J., Vulcan, W., Wood, S., Yan, C., Zhao, W. -X., and Zihlmann, B.

Subjects
Nuclear Experiment
Abstract

The data analysis for the reaction H(e,e' pi^+)n, which was used to determine values for the charged pion form factor Fpi for values of Q^2=0.6-1.6 GeV^2, has been repeated with careful inspection of all steps and special attention to systematic uncertainties. Also the method used to extract Fpi from the measured longitudinal cross section was critically reconsidered. Final values for the separated longitudinal and transverse cross sections and the extracted values of Fpi are presented., Comment: 11 pages, 6 figures

Published
2006
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7. Simultaneous X-ray and UV spectroscopy of the Seyfert 1 galaxy NGC 5548.II. Physical conditions in the X-ray absorber

Author

Steenbrugge, K. C., Kaastra, J. S., Crenshaw, D. M., Kraemer, S. B., Arav, N., George, I. M., Liedahl, D. A., van der Meer, R. L. J., Paerels, F. B. S., Turner, T. J., and Yaqoob, T.

Subjects
Astrophysics
Abstract

We present the results from a 500 ks Chandra observation of the Seyfert 1 galaxy NGC 5548. We detect broadened emission lines of O VII and C VI in the spectra, similar to those observed in the optical and UV bands. The source was continuously variable, with a 30 % increase in luminosity in the second half of the observation. No variability in the warm absorber was detected between the spectra from the first 170 ks and the second part of the observation. The velocity structure of the X-ray absorber is consistent with the velocity structure measured simultaneously in the ultraviolet spectra. We find that the highest velocity outflow component, at -1040 km/s, becomes increasingly important for higher ionization parameters. This velocity component spans at least three orders of magnitude in ionization parameter, producing both highly ionized X-ray absorption lines (Mg XII, Si XIV) as well as UV absorption lines. A similar conclusion is very probable for the other four velocity components. Based upon our observations, we argue that the warm absorber probably does not manifest itself in the form of photoionized clumps in pressure equilibrium with a surrounding wind. Instead, a model with a continuous distribution of column density versus ionization parameter gives an excellent fit to our data. From the shape of this distribution and the assumption that the mass loss through the wind should be smaller than the accretion rate onto the black hole, we derive upper limits to the solid angle as small as 10^{-4} sr. From this we argue that the outflow occurs in density-stratified streamers. The density stratification across the stream then produces the wide range of ionization parameter observed in this source. Abridged., Comment: 21 pages, 12 figures accepted for publication in A&A

Published
2005
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8. Simultaneous X-ray and Ultraviolet spectroscopy of the Seyfert galaxy NGC 5548. III. X-ray time variability

Author

Kaastra, J. S., Steenbrugge, K. C., Crenshaw, D. M., Kraemer, S. B., Arav, N., George, I. M., Liedahl, D. A., van der Meer, R. L. J., Paerels, F. B. S., Turner, T. J., and Yaqoob, T.

Subjects
Astrophysics
Abstract

The Seyfert 1 galaxy NGC 5548 was observed for a week by Chandra using both the HETGS and LETGS spectrometers. In this paper we study the time variability of the continuum radiation. During our observation, the source showed a gradual increase in flux over four days, followed by a rapid decrease and flattening of the light curve afterwards. Superimposed upon these relatively slow variations several short duration bursts or quasi-periodic oscillations occured with a typical duration of several hours and separation between 0.6-0.9 days. The bursts show a delay of the hard X-rays with respect to the soft X-rays of a few hours. We interprete these bursts as due to a rotating, fluctuating hot spot at approximately 10 gravitational radii; the time delay of the hard X-rays from the bursts agree with the canonical picture of Inverse Compton scattering of the soft accretion disk photons on a hot medium that is relatively close to the central black hole., Comment: 6 pages, 7 figures, accepted for publication in Astronomy and Astrophysics

Published
2004
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9. AD Leonis: Flares observed by XMM-Newton and Chandra

Author

Besselaar, E. J. M. van den, Raassen, A. J. J., Mewe, R., van der Meer, R. L. J., Guedel, M., and Audard, M.

Subjects
Astrophysics
Abstract

The M-dwarf AD Leonis has been observed with the Reflection Grating Spectrometers and the European Photon Imaging Camera aboard XMM-Newton and also with the Low Energy Transmission Grating Spectrometer aboard the Chandra X-ray Observatory. In the observation taken with XMM-Newton five large flares produced by AD Leo were identified and only one in the observation taken with Chandra. A quiescent level to the lightcurves is difficult to define, since several smaller flares mutually overlap each other. However, we defined a quasi-steady state outside of obvious flares or flare decays. The spectra from the flare state and the quasi-steady state are analysed separately. From these spectra the temperature structure was derived with a multi-temperature model and with a differential emission measure model. The multi-temperature model was also used to determine the relative abundances of C, N, O, Ne, Mg, Si, S, and Fe. He-like ions, such as O VII and Ne IX, produce line triplets which are used to determine or constrain the electron temperature and electron density of the corresponding ion. During the flare state a higher emission measure at the hottest temperature is found for both XMM-Newton and Chandra observations. The derived abundances suggest the presence of an inverse First Ionization Potential effect in the corona of AD Leo., Comment: 8 pages and 7 figures. Accepted for publication in Astronomy & Astrophysics

Published
2003
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10. The Soft X-ray Spectrum from NGC 1068 Observed with LETGS on Chandra

Author

Brinkman, A. C., Kaastra, J. S., van der Meer, R. L. J., Kinkhabwala, A., Behar, E., Kahn, S. M., Paerels, F. B. S., and Sako, M.

Subjects
Astrophysics
Abstract

Using the combined spectral and spatial resolving power of the Low Energy Transmission Grating (LETGS) on board Chandra, we obtain separate spectra from the bright central source of NGC 1068 (Primary region), and from a fainter bright spot 4" to the NE (Secondary region). Both spectra are dominated by line emission from H- and He-like ions of C through S, and from Fe L-shell ions, but also include narrow radiative recombination continua, indicating that most of the soft X-ray emission arises in low-temperature (kT few eV) photoionized plasma. We confirm the conclusions of Kinkhabwala et al. (2002), based on XMM-Newton RGS observations, that the entire nuclear spectrum can be explained by recombination/radiative cascade following photoionization, and radiative decay following photoexcitation, with no evidence for hot, collisionally ionized plasma. In addition, this model also provides an excellent fit to the spectrum of the Secondary region, albeit with radial column densities a factor of three lower, as would be expected given its distance from the source of the ionizing continuum. The remarkable overlap and kinematical agreement of the optical and X-ray line emission, coupled with the need for a distribution of ionization parameter to explain the X-ray spectra, collectively imply the presence of a distribution of densities (over a few orders of magnitude) at each radius in the ionization cone. Relative abundances of all elements are consistent with Solar abundance, except for N, which is 2-3 times Solar. The long wavelength spectrum beyond 30 A is rich of L-shell transitions of Mg, Si, S, and Ar, and M-shell transitions of Fe. The velocity dispersion decreases with increasing ionization parameter, as deduced from these long wavelength lines and the Fe-L shell lines., Comment: 12 pages, 11 figures, accepted for publication in Astronomy and Astrophysics

Published
2002
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11. Coronal density diagnostics with Helium-like triplets: CHANDRA--LETGS observations of Algol, Capella, Procyon, Eps Eri, Alpha Cen A&B, UX Ari, AD Leo, YY Gem, and HR1099

Author

Ness, J. -U., Schmitt, J. H. M. M., Burwitz, V., Mewe, R., Raassen, A. J. J., van der Meer, R. L. J., Predehl, P., and Brinkman, A. C.

Subjects
Astrophysics
Abstract

We present an analysis of ten cool stars (Algol, Capella, Procyon, Eps Eri, Alpha Cen A&B, UX Ari, AD Leo, YY Gem, and HR1099) observed with the Low Energy Transmission Grating Spectrometer (LETGS) on board the Chandra X-ray Observatory. This sample contains all cools stars observed with the LETGS presently available to us with integration times sufficiently long to warrant a meaningful spectral analysis. Our sample comprises inactive, moderately active, and hyperactive stars and samples the bulk part of activity levels encountered in coronal X-ray sources. We use the LETGS spectra to carry out density and temperature diagnostics with an emphasis on the H-like and the He-like ions. We find a correlation between line flux ratios of the Lyman-Alpha and He-like resonance lines with the mean X-ray surface flux. We determine densities using the He-like triplets. For active stars we find no significant deviations from the low-density limit for the ions of Ne, Mg, and Si, while the measured line ratios for the ions of C, N, and O do show evidence for departures from the low-density limit in the active stars, but not in the inactive stars. Best measurements can be made for the OVII triplet where we find significant deviations from the low-density limit for the stars Algol, Procyon, YY Gem, Eps Eri, and HR1099. We discuss the influence of radiation fields on the interpretation of the He-like triplet line ratios in the low-Z ions, which is relevant for Algol, and the influence of dielectronic satellite lines, which is relevant for Procyon. For the active stars YY Gem, Eps Eri, and HR1099 the low f/i ratios can unambiguously be attributed to high densties in the range 1--3 10^10 cm^-3 at OVII temperatures. We find our LETGS spectra to be an extremely useful tool for plasma diagnostics of stellar coronae., Comment: 17 pages, Latex2e, 12 figures. accepted for A&A under MS2627

Published
2002
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12. High-resolution X-ray spectroscopy of Procyon by Chandra and XMM-Newton

Author

Raassen, A. J. J., Mewe, R., Audard, M., Guedel, M., Behar, E., Kaastra, J. S., van der Meer, R. L. J., Foley, C. R., and Ness, J. -U.

Subjects
Astrophysics
Abstract

We report the analysis of the high-resolution soft X-ray spectrum of the nearby F-type star Procyon in the wavelength range from 5 to 175 Angstrom obtained with the Low Energy Transmission Grating Spectrometer (LETGS) on board Chandra and with the Reflection Grating Spectrometers (RGS) and the EPIC-MOS CCD spectrometers on board XMM-Newton. Line fluxes have been measured separately for the RGS and LETGS. Spectra have been fitted globally to obtain self-consistent temperatures, emission measures, and abundances. The total volume emission measure is ~4.1 x 10e50/cm3 with a peak between 1 and 3 MK. No indications for a dominant hot component (T > 4 MK) were found. We present additional evidence for the lack of a solar-type FIP-effect, confirming earlier EUVE results., Comment: 10 pages, 9 figures, A&A accepted

Published
2002
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13. Soft X-ray Spectroscopy of NGC 1068 with XMM-Newton RGS and Chandra LETGS

Author

Kinkhabwala, A., Sako, M., Behar, E., Kahn, S. M., Paerels, F., Brinkman, A. C., Kaastra, J. S., van der Meer, R. L. J., Gu, M. F., and Liedahl, D. A.

Subjects
Astrophysics
Abstract

We present high-resolution soft-X-ray spectra of the prototypical Seyfert 2 galaxy, NGC 1068, taken with XMM-Newton RGS and Chandra LETGS. Its rich emission-line spectrum is dominated by recombination in a warm plasma (bright, narrow radiative recombination continua provide the ``smoking gun''), which is photoionized by the inferred nuclear power-law continuum. Radiative decay following photoexcitation of resonant transitions is also significant. A self-consistent model of an irradiated cone of gas is capable of reproducing the hydrogenic/heliumlike ionic line series in detail. The radial ionic column densities we infer are consistent with absorption measurements (the warm absorber) in Seyfert 1 galaxies. This strongly suggests that the emission spectrum we observe from NGC 1068 emanates from its warm absorber. The observed extent of the ionization-cone/warm absorber in NGC 1068 of about 300 pc implies that a large fraction of the gas associated with generic warm absorbers may typically exist on the hundreds-of-parsec scale rather than much closer to the nucleus (e.g., less than a parsec). Spatially-resolved spectroscopy using the LETGS of two distinct emission regions yields two noticeably different spectra. We show that these differences are solely due to differing radial column densities. A fairly flat distribution in ionization parameter is necessary to explain the inferred radial ionic column densities of all spectra. This must primarily be due to a broad density distribution at each radius, spanning roughly 0.1-100 cm$^{-3}$. (Abridged), Comment: 9 pages, 15 figures, to appear in the proceedings of the symposium 'New Visions of the X-ray Universe in the XMM-Newton and Chandra Era', 26-30 November 2001, ESTEC, The Netherlands. Minor corrections/reference modifications (thanks to J. Krolik for pointing out)

Published
2002

14. X-ray spectroscopy of NGC 5548

Author

Kaastra, J. S., Steenbrugge, K. C., Raassen, A. J. J., van der Meer, R. L. J., Brinkman, A. C., Liedahl, D. A., Behar, E., and de Rosa, A.

Subjects
Astrophysics
Abstract

We analyze the high-resolution X-ray spectrum of the Seyfert 1 galaxy NGC 5548, for the full 0.1-10 keV band, using improved calibration results of the Chandra-LETGS instrument. The warm absorber consists of at least three ionization components, namely one with a low, medium and high ionization parameter. The X-ray absorbing material, from an outflowing wind, covers the full range of velocity components found from UV absorption lines. The presence of redshifted emission components for the strongest blue-shifted resonance absorption lines indicate that the absorber is located at a distance larger than the edge of the accretion disk. We derive an upper limit to the edge of the accretion disk of 1 light year. Absorption lines from ions of at least ten chemical elements have been detected, and in general for these elements there are no strong deviations from solar abundances. The narrow emission lines from the O VII and Ne IX forbidden and intercombination lines probably originate from much larger distances to the black hole. We find evidence for weak relativistically broadened oxygen and nitrogen emission lines from the inner parts of the accretion disk, but at a much smaller flux level than those observed in some other active galactic nuclei. In addition, there is a broad, non-relativistic C VI Ly alpha emission line that is consistent with emission lines from the inner part of the optical/UV broad line region., Comment: 18 pages, 19 figures, accepted for publication in Astronomy and Astrophysics

Published
2002
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15. The Chandra LETG and XMM-Newton Spectra of HR 1099

Author

Audard, M., Guedel, M., and van der Meer, R. L. J.

Subjects
Astrophysics
Abstract

The X-ray luminous RS CVn binary system HR 1099 has been observed on several occasions in the early phases of \textit{Chandra} and \textit{XMM-Newton}. A very hot (up to 40 MK) dominant coronal plasma has been identified from the high-resolution spectroscopic data; cooler plasma is seen down to about 3 MK. We recently obtained 100 ksec in \textit{Chandra}'s Guest Observer Program to study the corona of HR 1099 with the High-Resolution Camera (HRC-S) and the Low Energy Transmission Grating (LETG) across the complete temperature range above 1 MK. The data provide an unprecedented view of spectral lines and continua at high resolution between 1 and 175 \AA. We present our investigations on the Chandra LETGS observation of HR 1099 into the context of the latest results obtained with XMM-Newton., Comment: 4 pages, 6 figures. Proc. symposium "New Visions of the X-ray Universe in the XMM-Newton and Chandra Era" (ESA SP-488)

Published
2002

16. A Study of the Coronal Plasma in RS CVn binary systems: HR 1099 and co

Author

Audard, M., Guedel, M., Sres, A., Mewe, R., Raassen, A. J. J., Behar, E., Foley, C. R., and van der Meer, R. L. J.

Subjects
Astrophysics
Abstract

XMM-Newton has been performing comprehensive studies of X-ray luminous RS CVn binary systems in its calibration and guaranteed time programs. We present results from ongoing investigations in the context of a systematic study of coronal emission from RS CVns. We concentrate here on coronal abundances and investigate the abundance pattern in RS CVn binaries as a function of activity and average temperature. We find a transition from an Inverse First Ionization Potential (FIP) effect towards an absence of a clear trend (no FIP) in intermediately active RS CVn systems. This scheme fits well into the long-term evolution from an IFIP to a FIP effect found in solar analogs. We further study variations in the elemental abundances during a large flare., Comment: to appear in 35th ESLAB Symposium "Stellar Coronae in the Chandra and XMM-Newton Era", eds. F. Favata & J.J. Drake (San Francisco: ASP), in press

Published
2001

17. A Study of the Coronal Plasma in RS CVn binary systems

Author

Audard, M., Guedel, M., Sres, A., Mewe, R., Raassen, A. J. J., Behar, E., Foley, C. R., and van der Meer, R. L. J.

Subjects
Astrophysics
Abstract

XMM-Newton has been performing comprehensive studies of X-ray bright RS CVn binaries in its Calibration and Guaranteed Time programs. We present results from ongoing investigations in the context of a systematic study of coronal emission from RS CVns. We concentrate in this paper on coronal abundances and investigate the abundance pattern in RS CVn binaries as a function of activity and average temperature. A transition from an Inverse First Ionization Potential (FIP) effect towards an absence of a clear trend is found in intermediately active RS CVn systems. This scheme corresponds well into the long-term evolution from an IFIP to a FIP effect found in solar analogs. We further study variations in the elemental abundances during a large flare., Comment: to appear in The Twelfth Cool Stars, Stellar Systems and the Sun, eds. A. Brown, T.R. Ayres, G.M. Harper, (Boulder: Univ. of Colorado), in press

Published
2001
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18. Helium-like triplet density diagnostics: Applications to CHANDRA--LETGS X-ray observations of Capella and Procyon

Author

Ness, J. U., Mewe, R., Schmitt, J. H. M. M., Raassen, A. J. J., Porquet, D., Kaastra, J. S., van der Meer, R. L. J., Burwitz, V., and Predehl, P.

Subjects
Astrophysics
Abstract

Electron density diagnostics based on the triplets of Helium-like CV, NVI, and OVII are applied to the X-ray spectra of Capella and Procyon measured with the Low Energy Transmission Grating Spectrometer (LETGS) on board the Chandra X-ray Observatory. New theoretical models for the calculation of the line ratios between the forbidden (f), intercombination (i), and the resonance (r) lines of the helium-like triplets are used. The derived densities are quite typical of densities found in the solar active regions, and also pressures and temperatures in Procyon's and Capella's corona at a level of T=10^6K are quite similar. We find no evidence for densities as high as measured in solar flares. Comparison of our Capella and Procyon measurements with the Sun shows little difference in the physical properties of the layers producing the CV, NVI, and OVII emission. Assuming the X-ray emitting plasma to be confined in magnetic loops, we obtain typical loop length scales of L_Capella > 8 L_Procyon from the loop scaling laws, implying that the magnetic structures in Procyon and Capella are quite different. The total mean surface fluxes emitted in the helium- and hydrogen-like ions are quite similar for Capella and Procyon, but exceed typical solar values by one order of magnitude. We thus conclude that Procyon's and Capella's coronal filling factors are larger than corresponding solar values., Comment: 13 pages, Latex, fitting program Cora available at http://www.hs.uni-hamburg.de/german/persons/Ness/Software/cora-1.0.tar.gz accepted at A&A under MS10283

Published
2000
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19. Interstellar X-ray Absorption Spectroscopy of Oxygen, Neon, and Iron with the Chandra LETGS Spectrum of X0614+091

Author

Paerels, Frits, Brinkman, A. C., van der Meer, R. L. J., Kaastra, J. S., Kuulkers, E., Boggende, A. J. F. den, Predehl, P., Drake, Jeremy J., Kahn, Steven M., Savin, Daniel W., and McLaughlin, Brendan M.

Subjects
Astrophysics
Abstract

We find resolved interstellar O K, Ne K, and Fe L absorption spectra in the Chandra Low Energy Transmission Grating Spectrometer spectrum of the low mass X-ray binary X0614+091. We measure the column densities in O and Ne, and find direct spectroscopic constraints on the chemical state of the interstellar O. These measurements probably probe a low-density line of sight through the Galaxy and we discuss the results in the context of our knowledge of the properties of interstellar matter in regions between the spiral arms., Comment: 16 pages, 4 figures; ApJ, accepted

Published
2000
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20. High Resolution Spectroscopy of the X-ray Photoionized Wind in Cygnus X-3 with the Chandra High Energy Transmission Grating Spectrometer

Author

Paerels, Frits, Cottam, Jean, Sako, Masao, Liedahl, Duane A., Brinkman, A. C., van der Meer, R. L. J., Kaastra, J. S., and Predehl, P.

Subjects
Astrophysics
Abstract

We present a preliminary analysis of the 1--10 keV spectrum of the massive X-ray binary Cyg X-3, obtained with the High Energy Transmission Grating Spectrometer on the Chandra X-ray Observatory. The source reveals a richly detailed discrete emission spectrum, with clear signatures of photoionization-driven excitation. Among the spectroscopic novelties in the data are the first astrophysical detections of a number of He-like 'triplets' (Si, S, Ar) with emission line ratios characteristic of photoionization equilibrium, fully resolved narrow radiative recombination continua of Mg, Si, and S, the presence of the H-like Fe Balmer series, and a clear detection of a ~ 800 km/s large scale velocity field, as well as a ~1500 km/s FWHM Doppler broadening in the source. We briefly touch on the implications of these findings for the structure of the Wolf-Rayet wind., Comment: 11 pages, 3 figures; Accepted for publication in ApJ Letters

Published
2000
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21. First Light Measurements of Capella with the Low Energy Transmission Grating Spectrometer aboard the Chandra X-ray Observatory

Author

Brinkman, A. C., Gunsing, C. J. T., Kaastra, J. S., van der Meer, R. L. J., Mewe, R., Paerels, F., Raassen, A. J. J., van Rooijen, J. J., Bräuninger, H., Burkert, W., Burwitz, V., Hartner, G., Predehl, P., Ness, J. -U., Schmitt, J. H. M. M., Drake, J. J., Johnson, O., Juda, M., Kashyap, V., Murray, S. S., Pease, D., Ratzlaff, P., and Wargelin, B. J.

Subjects
Astrophysics
Abstract

We present the first X-ray spectrum obtained by the Low Energy Transmission Grating Spectrometer (LETGS) aboard the Chandra X-ray Observatory. The spectrum is of Capella and covers a wavelength range of 5-175 A (2.5-0.07 keV). The measured wavelength resolution, which is in good agreement with ground calibration, is $\Delta \lambda \simeq$ 0.06 A (FWHM). Although in-flight calibration of the LETGS is in progress, the high spectral resolution and unique wavelength coverage of the LETGS are well demonstrated by the results from Capella, a coronal source rich in spectral emission lines. While the primary purpose of this letter is to demonstrate the spectroscopic potential of the LETGS, we also briefly present some preliminary astrophysical results. We discuss plasma parameters derived from line ratios in narrow spectral bands, such as the electron density diagnostics of the He-like triplets of carbon, nitrogen, and oxygen, as well as resonance scattering of the strong Fe XVII line at 15.014 A., Comment: 4 pages (ApJ letter LaTeX), 2 PostScript figures, accepted for publication in ApJ Letters, 2000

Published
2000
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22. This title is unavailable for guests, please login to see more information.

Author

Massachusetts Institute of Technology. Department of Physics, Zhao, W.-X., Huber, G. M., Blok, H. P., Butuceanu, C., Gaskell, D., Horn, T., Mack, D. J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Beise, E. J., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E. F., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tadevosyan, V., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zheng, X., Zihlmann, B., Massachusetts Institute of Technology. Department of Physics, Zhao, W.-X., Huber, G. M., Blok, H. P., Butuceanu, C., Gaskell, D., Horn, T., Mack, D. J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Beise, E. J., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E. F., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tadevosyan, V., Tvaskis, V., van der Meer, R. L. J., Vansyoc, K., Van Westrum, D., Vidakovic, S., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zheng, X., and Zihlmann, B.

Abstract

United States. Dept. of Energy, National Science Foundation (U.S.)

Published
2014

23. CHANDRA-LETGS X-ray observations of Capella

Author

Mewe, R., Raassen, A. J. J., Drake, J. J., Kaastra, J. S., van Der Meer, R. L. J., Porquet, D., SRON Netherlands Institute for Space Research (SRON), Smithsonian Astrophysical Observatory, Smithsonian Institution, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
STARS: INDIVIDUAL: CAPELLA, ATOMIC PROCESSES, STARS: ACTIVITY, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], [SDU]Sciences of the Universe [physics], [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], X-RAYS: STARS, STARS: LATE-TYPE, STARS: CORONAE
Abstract

International audience; We report an analysis of the X-ray spectrum of Capella from 6 to 175 Å obtained with the Low Energy Transmission Grating Spectrometer (LETGS) on board of the X-ray space observatory CHANDRA. Many emission line features appear that can be resolved much better as compared to former instruments (EUVE and ASCA). Coronal electron densities (ne) and temperatures (T) of brightly emitting regions are constrained by an analysis of ratios of density- and temperature-sensitive lines of helium-like ions and highly ionized iron atoms. Lines emitted by e.g., O VII & VIII, Mg X-XII, Si XII-XIV, Fe IX, X & XV-XXIII are used to derive T. Line ratios in the helium-like triplets of C V, N VI, O VII, Mg XI, and Si XIII yield T in the range 0.5-10 MK, and ne in the range 109-1013 cm-3. The Fe IX/X ratio yields T =~ 0.9 MK, while lines from Fe XVIII to XXII give T ~ 6-10 MK. Flux ratios of Fe XX-XXII lines indicate for the electron densities an upper limit in the range ne

Published
2001
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24. Helium-like triplet density diagnostics

Author

Ness, J.-U., Mewe, R., Schmitt, J. H. M. M., Raassen, A. J. J., Porquet, D., Kaastra, J. S., van Der Meer, R. L. J., Burwitz, V., Predehl, P., Universität Hamburg (UHH), SRON Netherlands Institute for Space Research (SRON), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Max Planck Institute for Extraterrestrial Physics (MPE), and Max-Planck-Gesellschaft

Subjects
TECHNIQUES: SPECTROSCOPIC, ATOMIC DATA, ATOMIC PROCESSES, PROCYON, STARS: ACTIVITY, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], [SDU]Sciences of the Universe [physics], [SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], X-RAYS: STARS, STARS: LATE-TYPE, STARS: INDIVIDUAL: CAPELLA &amp, STARS: CORONAE
Abstract

International audience; Electron density diagnostics based on the triplets of helium-like C v, N vi, and O vii are applied to the X-ray spectra of Capella and Procyon measured with the Low Energy Transmission Grating Spectrometer (LETGS) on board the Chandra X-ray Observatory. New theoretical models for the calculation of the line ratios between the forbidden (f), intercombination (i), and the resonance (r) lines of the helium-like triplets are used. The (logarithmic) electron densities (in cgs units) derived from the f/i ratios for Capella are = 8 {L_Procyon} from the loop scaling laws, implying that the magnetic structures in Procyon and Capella are quite different. The total mean surface fluxes emitted in the helium- and hydrogen-like ions are quite similar for Capella and Procyon, but exceed typical solar values by one order of magnitude. We thus conclude that Procyon's and Capella's coronal filling factors are larger than corresponding solar values.

Published
2001
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26. Dynamics of the $^{16}$O(e,e'p) cross section at high missing energies

Author

Liyanage, N., Anderson, B. D., Aniol, K. A., Auerbach, L., Baker, F. T., Berthot, J., Bertozzi, W., Bertin, P. Y., Bimbot, L., Boeglin, W. U., Brash, E. J., Vincent Breton, Breuer, H., Burtin, E., Calarco, J. R., Cardman, L., Cates, G. D., Cavata, C., Chang, C. C., Chen, J. P., Cisbani, E., Dale, D. S., Leo, R., Deur, A., Diederich, B., Djawotho, P., Domingo, J., Doyle, B., Ducret, J. E., Epstein, M. B., Ewell, L. A., Finn, J. M., Fissum, K. G., Fonvieille, H., Frois, B., Frullani, S., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Gorringe, T., Hersman, F. W., Holmes, R., Holtrop, M., Hose, N. D., Howell, C., Huber, G. M., Hyde-Wright, C. E., Iodice, M., Jager, C. W., Jaminion, S., Jones, M. K., Joo, K., Jutier, C., Kahl, W., Kato, S., Kelly, J. J., Kerhoas, S., Khandaker, M., Khayat, M., Kino, K., Korsch, W., Kramer, L., Kumar, K. S., Kumbartzki, G., Laveissiere, G., Leone, A., Lerose, J. J., Levchuk, L., Liang, M., Lindgren, R. A., Lolos, G. J., Lourie, R. W., Madey, R., Maeda, K., Malov, S., Manley, D. M., Margaziotis, D. J., Markowitz, P., Martino, J., Mccarthy, J. S., Mccormick, K., Mcintyre, J., Meer, R. L. J., Meziani, Z. E., Michaels, R., Mougey, J., Nanda, S., Neyret, D., Offermann, E. A. J. M., Papandreou, Z., Perdrisat, C. F., Perrino, R., Petratos, G. G., Platchkov, S., Pomatsalyuk, R., Prout, D. L., Punjabi, V. A., Pussieux, T., Quéméner, G., Ransome, R. D., Ravel, O., Roblin, Y., Roche, R., Rowntree, D., Rutledge, G. A., Saha, A., Saito, T., Sarty, A. J., Serdarevic-Offermann, A., Smith, T. P., Soldi, A., Sorokin, P., Souder, P., Suleiman, R., Templon, J. A., Terasawa, T., Todor, L., Tsubota, H., Ueno, H., Ulmer, P. E., Urciuoli, G. M., Vernin, P., Verst, S., Vlahovic, B., Voskanian, H., Watson, J. W., Weinstein, L. B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B., Zainea, D. G., Zeps, V., Zhao, J., Zhou, Z. L., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), HALL A, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment
Abstract

We measured the cross section and response functions (R_L, R_T, and R_LT) for the 16O(e,e'p) reaction in quasielastic kinematics for missing energies 25 60 MeV and P_miss > 200 MeV/c, the cross section is relatively constant. Calculations which include contributions from pion exchange currents, isobar currents and short-range correlations account for the shape and the transversity but only for half of the magnitude of the measured cross section.

Published
2001
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27. Polarization transfer in the ${16}O$ ($\vec{e},e'\vec{p}$) $^{15}$N reaction

Author

Malov, S., Wijesooriya, K., Baker, F. T., Bimbot, L., Brash, E. J., Chang, C. C., Finn, J. M., Fissum, K. G., Gao, J., Gilman, R., Glashausser, C., Jones, M. K., Kelly, J. J., Kumbartzki, G., Liyanage, N., Mcintyre, J., Nanda, S., Perdrisat, C. F., Punjabi, V. A., Quéméner, G., Ransome, R. D., Rutt, P. M., Zainea, D. G., Anderson, B. D., Aniol, K. A., Auerbach, L., Berthot, J., Bertozzi, W., Bertin, P. Y., Boeglin, W. U., Vincent Breton, Breuer, H., Burtin, E., Calarco, J. R., Cardman, L., Cates, G. D., Cavata, C., Chen, J. P., Cisbani, E., Dale, D. S., Leo, R., Deur, A., Diederich, B., Djawotho, P., Domingo, J., Doyle, B., Ducret, J. E., Epstein, M. B., Ewell, L. A., Fleniken, J., Fonvieille, H., Frois, B., Frullani, S., Garibaldi, F., Gasparian, A., Gilad, S., Glamazdin, A., Gomez, J., Gorbenko, V., Gorringe, T., Griffioen, K., Hersman, F. W., Hines, J., Holmes, R., Holtrop, M., Hose, N. D., Howell, C., Huber, G. M., Hyde-Wright, C. E., Iodice, M., Jager, C. W., Jaminion, S., Joo, K., Jutier, C., Kahl, W., Kato, S., Kerhoas, S., Khandaker, M., Khayat, M., Kino, K., Korsch, W., Kramer, L., Kumar, K. S., Laveissiere, G., Leone, A., Lerose, J. J., Levchuk, L., Liang, M., Lindgren, R. A., Lolos, G. J., Lourie, R. W., Madey, R., Maeda, K., Manley, D. M., Margaziotis, D. J., Markowitz, P., Marroncle, J., Martino, J., Mccarthy, J. S., Mccormick, K., Meer, R. L. J., Meziani, Z. E., Michaels, R., Mougey, J., Neyret, D., Offermann, E. A. J. M., Papandreou, Z., Perrino, R., Petratos, G. G., Platchkov, S., Pomatsalyuk, R., Prout, D. L., Pussieux, T., Ravel, O., Roblin, Y., Roche, R., Rowntree, D., Rutledge, G. A., Saha, A., Saito, T., Sarty, A. J., Serdarevic-Offermann, A., Smith, T. P., Soldi, A., Sorokin, P., Souder, P., Suleiman, R., Templon, J. A., Terasawa, T., Todor, L., Tsubota, H., Ueno, H., Ulmer, P. E., Urciuoli, G. M., Vernin, P., Verst, S., Vlahovic, B., Voskanian, H., Watson, J. W., Weinstein, L. B., Wilson, R., Wojtsekhowski, B., Zeps, V., Zhao, J., Zhou, Z. L., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), HALL A, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment
Abstract

The first (e,e'p) polarization transfer measurements on a nucleus heavier than deuterium have been carried out at Jefferson Laboratory. Transverse and longitudinal components of the polarization of protons ejected in the reaction 16O(e,e'p) were measured in quasielastic perpendicular kinematics at a Q^2 of 0.8 (GeV/c)^2. The data are in good agreement with state of the art calculations, but do not exclude possible changes in the ratio of the electric to magnetic form factors of the nucleon in the nuclear medium at the level of recent theoretical predictions.

Published
2000
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28. Dynamical relativistic effects in quasielastic 1p-shell proton knockout from $^{16}$O

Author

Gao, J., Anderson, B. D., Aniol, K. A., Auerbach, L., Baker, F. T., Beise, E. J., Berthot, J., Bertin, P. Y., Bertozzi, W., Bimbot, L., Boeglin, W. U., Brash, E. J., Vincent Breton, Breuer, H., Burtin, E., Calarco, J. R., Cardman, L. S., Cates, G. D., Cavata, C., Chang, C. C., Chant, N. S., Chen, J. P., Cisbani, E., Dale, D. S., Deur, A., Diederich, B., Djawotho, P., Doyle, B., Ducret, J. E., Epstein, M. B., Ewell, L. A., Finn, J. M., Fissum, K. G., Fonvieille, H., Frois, B., Frullani, S., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Gorringe, T., Griffieon, K., Hersman, F. W., Holmes, R., Holtrop, M., Hose, N. D., Howell, C., Huber, G. M., Hyde-Wright, C., Iodice, M., Jager, C. W., Jaminion, S., Jones, M. K., Joo, K., Jutier, C., Kahl, W., Kato, S., Kelly, J. J., Kerhoas, S., Khandaker, M., Khayat, M., Kino, K., Korsch, W., Kramer, L. H., Kumar, K. S., Kumbartzki, G., Laveissiere, G., Leo, R., Leone, A., Le Rose, J. J., Levchuk, L., Liang, M., Lindgren, R. A., Liyanage, N., Lolos, G. J., Lourie, R. W., Madey, R., Maeda, K., Malov, S., Manley, D. M., Margaziotis, D. J., Markowitz, P., Marroncle, J., Martino, J., Mccarty, J. S., Mccormick, K., Mcintyre, J., Meer, R. L. J., Meziani, Z. E., Michaels, R., Mougey, J. Y., Nanda, S. K., Neyret, D., Offermann, E. A. J. M., Papandreou, Z., Perdrisat, C. F., Perrino, R., Petratos, G. G., Platchkov, S., Pomatsalyuk, R., Prout, D. L., Punjabi, V. A., Pussieux, T., Quéméner, G., Ransome, R. D., Ravel, O., Roblin, Y., Roche, R., Rondon-Aramayo, O. A., Roos, P. G., Rowntree, D., Rutledge, G., Rutt, P. M., Saha, A., Saito, T., Sarty, A. J., Serdarevic-Offermann, A., Smith, T., Soldi, K., Sorokin, P., Souder, P. A., Suleiman, R., Templon, J. A., Terasawa, T., Todor, L., Tsubota, H., Ueno, H., Ulmer, P. E., Urciuoli, G. M., Vernin, P., Verst, S., Vlahovic, B., Voskanyan, H., Watson, J. W., Weinstein, L. B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B. B., Zainea, D. G., Zeps, V., Zhao, J., Zhou, Z. L., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), HALL A, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

We have measured the cross section for quasielastic 1p-shell proton knockout in the 16O(e,e′p) reaction at ω=0.439GeV and Q2=0.8(GeV/c)2 for missing momentum Pmiss≤355MeV/c. We have extracted the response functions RL+TT, RT, RLT, and the left-right asymmetry, ALT, for the 1p1/2 and the 1p3/2 states. The data are well described by relativistic distorted wave impulse approximation calculations. At large Pmiss, the structure observed in ALT indicates the existence of dynamical relativistic effects. (APS)

Published
2000
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29. Quasielastic 1p-shell proton knockout from $^{16}O$ at $Q^{2} = 0.8 (GeV/c)^{2}$

Author

Gao, J, Anderson, B D, Aniol, K A, Auerbach, L B, Baker, F T, Beise, E J, Berthot, J, Bertin, P Y, Bertozzi, W, Bimbot, L, Brash, E J, Breton, V, Breuer, H, Burtin, E, Böglin, W, Calarco, J R, Cardman, L S, Cates, G D, Cavata, C, Chang, C C, Chant, N S, Chen, J P, Cisbani, E, D'Hose, N, Dale, D S, De Jager, C W, De Leo, R, Deur, A, Diederich, B, Djawotho, P, Doyle, B, Ducret, J E, Epstein, M B, Ewell, L A, Finn, J M, Fissum, K G, Fonvieille, H, Frois, Bernard, Frullani, S, Garibaldi, F, Gasparian, A, Gilad, S, Gilman, R, Glamazdin, A V, Glashausser, C, Gorbenko, V G, Gorringe, T P, Griffieon, K, Gómez, J, Hersman, F W, Holmes, R, Holtrop, M, Howell, C, Huber, G M, Hyde-Wright, C E, Iodice, M, Jaminion, S, Jones, M K, Joo, K K, Jutier, C, Kahl, W E, Kato, S, Kelly, J J, Kerhoas, S, Khandaker, M, Khayat, M, Kino, K, Korsch, W, Kramer, L, Kumar, K S, Kumbartzki, G J, Laveissière, G, Le Rose, J J, Leone, A, Levchuk, L G, Liang, M, Lindgren, R A, Liyanage, N K, Lolos, G J, Lourie, R W, Madey, R, Maeda, K I, Malov, S Y, Manley, D M, Margaziotis, D J, Markowitz, P, Martino, J, McCarthy, J S, McCormick, K, McIntyre, J, Meziani, Z E, Michaels, R, Mougey, J, Nanda, S, Neyret, D, Offermann, E, Papandreou, Z, Perdrisat, C F, Perrino, R, Petratos, G G, Platchkov, S K, Pomatsalyuk, R I, Prout, D L, Punjabi, V A, Pussieux, T, Quéméner, G, Ransome, R D, Ravel, O, Roblin, Y, Roché, R, Rondon-Aramayo, O A, Roos, P G, Rowntree, D, Rutledge, G A, Rutt, P M, Saha, A, Saitô, T, Sarty, A J, Serdarevic-Offermann, A, Smith, T P, Soldi, A, Sorokin, P, Souder, P A, Suleiman, R, Templon, J A, Terasawa, T, Todor, L, Tsubota, H, Ueno, H, Ulmer, P E, Urciuoli, G M, Van Verst, S P, Van der Meer, R L J, Vernin, P, Vlahovic, B, Voskanyan, H, Watson, J W, Weinstein, L B, Wijesooriya, K, Wilson, R, Wojtsekhowski, B B, Zainea, D G, Zeps, V, Zhao, J, and Zhou, Z L

Subjects
Nuclear Physics
Published
1999

30. Measurements of the deuteron elastic structure function $A(Q^2)$ for $0.7\leq Q^2\leq 6.0$ (GeV/c)$^2$ at Jefferson Laboratory

Author

Alexa, L. C., Anderson, B. D., Aniol, K. A., Arundell, K., Auerbach, L., Baker, F. T., Berthot, J., Bertin, P. Y., Bertozzi, W., Bimbot, L., Boeglin, W. U., Brash, E. J., Vincent Breton, Breuer, H., Burtin, E., Calarco, J. R., Cardman, L. S., Cavata, C., Chang, C. C., Chen, J. P., Chudakov, E., Cisbani, E., Dale, D. S., Degrande, N., Leo, R., Deur, A., Hose, N. D., Diederich, B., Domingo, J. J., Epstein, M. B., Ewell, L. A., Finn, J. M., Fissum, K. G., Fonvieille, H., Frois, B., Frullani, S., Gao, H., Gao, J., Garibaldi, F., Gasparian, A., Gilad, S., Gilman, R., Glamazdin, A., Glashausser, C., Gomez, J., Gorbenko, V., Hansen, J. O., Holmes, R., Holtrop, M., Howell, C., Huber, G. M., Hyde-Wright, C., Iodice, M., Jager, C. W., Jaminion, S., Jardillier, J., Jones, M. K., Jutier, C., Kahl, W., Kato, S., Katramatou, A. T., Kelly, J. J., Kerhoas, S., Ketikian, A., Khayat, M., Kino, K., Kramer, L. H., Kumar, K. S., Kumbartzki, G., Kuss, M., Laveissiere, G., Leone, A., Le Rose, J. J., Liang, M., Lindgren, R. A., Liyanage, N., Lolos, G. J., Lourie, R. W., Madey, R., Maeda, K., Malov, S., Manley, D. M., Margaziotis, D. J., Markowitz, P., Marroncle, J., Martino, J., Martoff, C. J., Mccormick, K., Mcintyre, J., Meer, R. L. J., Mehrabian, S., Meziani, Z. E., Michaels, R., Miller, G. W., Mougey, J. Y., Nanda, S. K., Neyret, D., Offermann, E. A. J. M., Papandreou, Z., Perdrisat, C. F., Perrino, R., Petratos, G. G., Platchkov, S., Pomatsalyuk, R., Prout, D. L., Punjabi, V. A., Pussieux, T., Quéméner, G., Ransome, R. D., Ravel, O., Roblin, Y., Rowntree, D., Rutledge, G., Rutt, P. M., Saha, A., Saito, T., Sarty, A. J., Serdarevic, A., Smith, T., Soldi, K., Sorokin, P., Souder, P. A., Suleiman, R., Templon, J. A., Terasawa, T., Todor, L., Tsubota, H., Ueno, H., Ulmer, P. E., Urciuoli, G. M., Hoorebeke, L., Vernin, P., Vlahovic, B., Voskanian, H., Watson, J. W., Weinstein, L. B., Wijesooriya, K., Wilson, R., Wojtsekhowski, B. B., Zainea, D. G., Zhang, W. M., Zhao, J., Zhou, Z. L., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), HALL A, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Physics::Lattice, Nuclear Theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment
Abstract

The deuteron elastic structure function A(Q^2) has been extracted in the Q^2 range 0.7 to 6.0 (GeV/c)^2 from cross section measurements of elastic electron-deuteron scattering in coincidence using the Hall A Facility of Jefferson Laboratory. The data are compared to theoretical models based on the impulse approximation with inclusion of meson-exchange currents, and to predictions of quark dimensional scaling and perturbative quantum chromodynamics

Published
1999
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31. Virtual Compton scattering and neutral pion electroproduction in the resonance region up to the deep inelastic region at backward angles

Author

Laveissière, G., primary, Degrande, N., additional, Jaminion, S., additional, Jutier, C., additional, Todor, L., additional, Salvo, R. Di, additional, Hoorebeke, L. Van, additional, Alexa, L. C., additional, Anderson, B. D., additional, Aniol, K. A., additional, Arundell, K., additional, Audit, G., additional, Auerbach, L., additional, Baker, F. T., additional, Baylac, M., additional, Berthot, J., additional, Bertin, P. Y., additional, Bertozzi, W., additional, Bimbot, L., additional, Boeglin, W. U., additional, Brash, E. J., additional, Breton, V., additional, Breuer, H., additional, Burtin, E., additional, Calarco, J. R., additional, Cardman, L. S., additional, Cavata, C., additional, Chang, C.-C., additional, Chen, J.-P., additional, Chudakov, E., additional, Cisbani, E., additional, Dale, D. S., additional, de Jager, C. W., additional, De Leo, R., additional, Deur, A., additional, d'Hose, N., additional, Dodge, G. E., additional, Domingo, J. J., additional, Elouadrhiri, L., additional, Epstein, M. B., additional, Ewell, L. A., additional, Finn, J. M., additional, Fissum, K. G., additional, Fonvieille, H., additional, Fournier, G., additional, Frois, B., additional, Frullani, S., additional, Furget, C., additional, Gao, H., additional, Gao, J., additional, Garibaldi, F., additional, Gasparian, A., additional, Gilad, S., additional, Gilman, R., additional, Glamazdin, A., additional, Glashausser, C., additional, Gomez, J., additional, Gorbenko, V., additional, Grenier, P., additional, Guichon, P. A. M., additional, Hansen, J. O., additional, Holmes, R., additional, Holtrop, M., additional, Howell, C., additional, Huber, G. M., additional, Hyde, C. E., additional, Incerti, S., additional, Iodice, M., additional, Jardillier, J., additional, Jones, M. K., additional, Kahl, W., additional, Kamalov, S., additional, Kato, S., additional, Katramatou, A. T., additional, Kelly, J. J., additional, Kerhoas, S., additional, Ketikyan, A., additional, Khayat, M., additional, Kino, K., additional, Kox, S., additional, Kramer, L. H., additional, Kumar, K. S., additional, Kumbartzki, G., additional, Kuss, M., additional, Leone, A., additional, LeRose, J. J., additional, Liang, M., additional, Lindgren, R. A., additional, Liyanage, N., additional, Lolos, G. J., additional, Lourie, R. W., additional, Madey, R., additional, Maeda, K., additional, Malov, S., additional, Manley, D. M., additional, Marchand, C., additional, Marchand, D., additional, Margaziotis, D. J., additional, Markowitz, P., additional, Marroncle, J., additional, Martino, J., additional, McCormick, K., additional, McIntyre, J., additional, Mehrabyan, S., additional, Merchez, F., additional, Meziani, Z. E., additional, Michaels, R., additional, Miller, G. W., additional, Mougey, J. Y., additional, Nanda, S. K., additional, Neyret, D., additional, Offermann, E. A. J. M., additional, Papandreou, Z., additional, Perdrisat, C. F., additional, Perrino, R., additional, Petratos, G. G., additional, Platchkov, S., additional, Pomatsalyuk, R., additional, Prout, D. L., additional, Punjabi, V. A., additional, Pussieux, T., additional, Quémenér, G., additional, Ransome, R. D., additional, Ravel, O., additional, Real, J. S., additional, Renard, F., additional, Roblin, Y., additional, Rowntree, D., additional, Rutledge, G., additional, Rutt, P. M., additional, Saha, A., additional, Saito, T., additional, Sarty, A. J., additional, Serdarevic, A., additional, Smith, T., additional, Smirnov, G., additional, Soldi, K., additional, Sorokin, P., additional, Souder, P. A., additional, Suleiman, R., additional, Templon, J. A., additional, Terasawa, T., additional, Tiator, L., additional, Tieulent, R., additional, Tomasi-Gustaffson, E., additional, Tsubota, H., additional, Ueno, H., additional, Ulmer, P. E., additional, Urciuoli, G. M., additional, De Vyver, R. Van, additional, der Meer, R. L. J. Van, additional, Vernin, P., additional, Vlahovic, B., additional, Voskanyan, H., additional, Voutier, E., additional, Watson, J. W., additional, Weinstein, L. B., additional, Wijesooriya, K., additional, Wilson, R., additional, Wojtsekhowski, B. B., additional, Zainea, D. G., additional, Zhang, W.-M., additional, Zhao, J., additional, and Zhou, Z.-L., additional

Published
2009
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32. Charged pion form factor betweenQ2=0.60and 2.45GeV2. I. Measurements of the cross section for the1H(e,e'π+)nreaction

Author

Blok, H. P., primary, Horn, T., additional, Huber, G. M., additional, Beise, E. J., additional, Gaskell, D., additional, Mack, D. J., additional, Tadevosyan, V., additional, Volmer, J., additional, Abbott, D., additional, Aniol, K., additional, Anklin, H., additional, Armstrong, C., additional, Arrington, J., additional, Assamagan, K., additional, Avery, S., additional, Baker, O. K., additional, Barrett, B., additional, Bochna, C., additional, Boeglin, W., additional, Brash, E. J., additional, Breuer, H., additional, Chang, C. C., additional, Chant, N., additional, Christy, M. E., additional, Dunne, J., additional, Eden, T., additional, Ent, R., additional, Fenker, H., additional, Gibson, E., additional, Gilman, R., additional, Gustafsson, K., additional, Hinton, W., additional, Holt, R. J., additional, Jackson, H., additional, Jin, S., additional, Jones, M. K., additional, Keppel, C. E., additional, Kim, P. H., additional, Kim, W., additional, King, P. M., additional, Klein, A., additional, Koltenuk, D., additional, Kovaltchouk, V., additional, Liang, M., additional, Liu, J., additional, Lolos, G. J., additional, Lung, A., additional, Margaziotis, D. J., additional, Markowitz, P., additional, Matsumura, A., additional, McKee, D., additional, Meekins, D., additional, Mitchell, J., additional, Miyoshi, T., additional, Mkrtchyan, H., additional, Mueller, B., additional, Niculescu, G., additional, Niculescu, I., additional, Okayasu, Y., additional, Pentchev, L., additional, Perdrisat, C., additional, Pitz, D., additional, Potterveld, D., additional, Punjabi, V., additional, Qin, L. M., additional, Reimer, P., additional, Reinhold, J., additional, Roche, J., additional, Roos, P. G., additional, Sarty, A., additional, Shin, I. K., additional, Smith, G. R., additional, Stepanyan, S., additional, Tang, L. G., additional, Tvaskis, V., additional, van der Meer, R. L. J., additional, Vansyoc, K., additional, Westrum, D. Van, additional, Vidakovic, S., additional, Vulcan, W., additional, Warren, G., additional, Wood, S. A., additional, Xu, C., additional, Yan, C., additional, Zhao, W.-X., additional, Zheng, X., additional, and Zihlmann, B., additional

Published
2008
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33. Charged pion form factor betweenQ2=0.60and2.45 GeV2. II. Determination of, and results for, the pion form factor

Author

Huber, G. M., primary, Blok, H. P., additional, Horn, T., additional, Beise, E. J., additional, Gaskell, D., additional, Mack, D. J., additional, Tadevosyan, V., additional, Volmer, J., additional, Abbott, D., additional, Aniol, K., additional, Anklin, H., additional, Armstrong, C., additional, Arrington, J., additional, Assamagan, K., additional, Avery, S., additional, Baker, O. K., additional, Barrett, B., additional, Bochna, C., additional, Boeglin, W., additional, Brash, E. J., additional, Breuer, H., additional, Chang, C. C., additional, Chant, N., additional, Christy, M. E., additional, Dunne, J., additional, Eden, T., additional, Ent, R., additional, Fenker, H., additional, Gibson, E. F., additional, Gilman, R., additional, Gustafsson, K., additional, Hinton, W., additional, Holt, R. J., additional, Jackson, H., additional, Jin, S., additional, Jones, M. K., additional, Keppel, C. E., additional, Kim, P. H., additional, Kim, W., additional, King, P. M., additional, Klein, A., additional, Koltenuk, D., additional, Kovaltchouk, V., additional, Liang, M., additional, Liu, J., additional, Lolos, G. J., additional, Lung, A., additional, Margaziotis, D. J., additional, Markowitz, P., additional, Matsumura, A., additional, McKee, D., additional, Meekins, D., additional, Mitchell, J., additional, Miyoshi, T., additional, Mkrtchyan, H., additional, Mueller, B., additional, Niculescu, G., additional, Niculescu, I., additional, Okayasu, Y., additional, Pentchev, L., additional, Perdrisat, C., additional, Pitz, D., additional, Potterveld, D., additional, Punjabi, V., additional, Qin, L. M., additional, Reimer, P. E., additional, Reinhold, J., additional, Roche, J., additional, Roos, P. G., additional, Sarty, A., additional, Shin, I. K., additional, Smith, G. R., additional, Stepanyan, S., additional, Tang, L. G., additional, Tvaskis, V., additional, van der Meer, R. L. J., additional, Vansyoc, K., additional, Westrum, D. Van, additional, Vidakovic, S., additional, Vulcan, W., additional, Warren, G., additional, Wood, S. A., additional, Xu, C., additional, Yan, C., additional, Zhao, W.-X., additional, Zheng, X., additional, and Zihlmann, B., additional

Published
2008
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34. Determination of the pion charge form factor forQ2=0.60–1.60 GeV2

Author

Tadevosyan, V., primary, Blok, H. P., additional, Huber, G. M., additional, Abbott, D., additional, Anklin, H., additional, Armstrong, C., additional, Arrington, J., additional, Assamagan, K., additional, Avery, S., additional, Baker, O. K., additional, Bochna, C., additional, Brash, E. J., additional, Breuer, H., additional, Chant, N., additional, Dunne, J., additional, Eden, T., additional, Ent, R., additional, Gaskell, D., additional, Gilman, R., additional, Gustafsson, K., additional, Hinton, W., additional, Jackson, H., additional, Jones, M. K., additional, Keppel, C., additional, Kim, P. H., additional, Kim, W., additional, Klein, A., additional, Koltenuk, D., additional, Liang, M., additional, Lolos, G. J., additional, Lung, A., additional, Mack, D. J., additional, McKee, D., additional, Meekins, D., additional, Mitchell, J., additional, Mkrtchyan, H., additional, Mueller, B., additional, Niculescu, G., additional, Niculescu, I., additional, Pitz, D., additional, Potterveld, D., additional, Qin, L. M., additional, Reinhold, J., additional, Shin, I. K., additional, Stepanyan, S., additional, Tang, L. G., additional, Meer, R. L. J. van der, additional, Vansyoc, K., additional, Westrum, D. Van, additional, Volmer, J., additional, Vulcan, W., additional, Wood, S., additional, Yan, C., additional, Zhao, W.-X., additional, and Zihlmann, B., additional

Published
2007
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35. Publisher's Note: Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer [Phys. Rev. C 71, 055202 (2005)]

Author

Punjabi, V., primary, Perdrisat, C. F., additional, Aniol, K. A., additional, Baker, F. T., additional, Berthot, J., additional, Bertin, P. Y., additional, Bertozzi, W., additional, Besson, A., additional, Bimbot, L., additional, Boeglin, W. U., additional, Brash, E. J., additional, Brown, D., additional, Calarco, J. R., additional, Cardman, L. S., additional, Chai, Z., additional, Chang, C.-C., additional, Chen, J.-P., additional, Chudakov, E., additional, Churchwell, S., additional, Cisbani, E., additional, Dale, D. S., additional, Leo, R. De, additional, Deur, A., additional, Diederich, B., additional, Domingo, J. J., additional, Epstein, M. B., additional, Ewell, L. A., additional, Fissum, K. G., additional, Fleck, A., additional, Fonvieille, H., additional, Frullani, S., additional, Gao, J., additional, Garibaldi, F., additional, Gasparian, A., additional, Gerstner, G., additional, Gilad, S., additional, Gilman, R., additional, Glamazdin, A., additional, Glashausser, C., additional, Gomez, J., additional, Gorbenko, V., additional, Green, A., additional, Hansen, J.-O., additional, Howell, C. R., additional, Huber, G. M., additional, Iodice, M., additional, Jager, C. W. de, additional, Jaminion, S., additional, Jiang, X., additional, Jones, M. K., additional, Kahl, W., additional, Kelly, J. J., additional, Khayat, M., additional, Kramer, L. H., additional, Kumbartzki, G., additional, Kuss, M., additional, Lakuriki, E., additional, Laveissière, G., additional, LeRose, J. J., additional, Liang, M., additional, Lindgren, R. A., additional, Liyanage, N., additional, Lolos, G. J., additional, Macri, R., additional, Madey, R., additional, Malov, S., additional, Margaziotis, D. J., additional, Markowitz, P., additional, McCormick, K., additional, McIntyre, J. I., additional, Meer, R. L. J. van der, additional, Michaels, R., additional, Milbrath, B. D., additional, Mougey, J. Y., additional, Nanda, S. K., additional, Offermann, E. A. J. M., additional, Papandreou, Z., additional, Pentchev, L., additional, Petratos, G. G., additional, Piskunov, N. M., additional, Pomatsalyuk, R. I., additional, Prout, D. L., additional, Quéméner, G., additional, Ransome, R. D., additional, Raue, B. A., additional, Roblin, Y., additional, Roche, R., additional, Rutledge, G., additional, Rutt, P. M., additional, Saha, A., additional, Saito, T., additional, Sarty, A. J., additional, Smith, T. P., additional, Sorokin, P., additional, Strauch, S., additional, Suleiman, R., additional, Takahashi, K., additional, Templon, J. A., additional, Todor, L., additional, Ulmer, P. E., additional, Urciuoli, G. M., additional, Vernin, P., additional, Vlahovic, B., additional, Voskanyan, H., additional, Wijesooriya, K., additional, Wojtsekhowski, B. B., additional, Woo, R. J., additional, Xiong, F., additional, Zainea, G. D., additional, and Zhou, Z.-L., additional

Published
2005
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36. Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer

Author

Punjabi, V., primary, Perdrisat, C. F., additional, Aniol, K. A., additional, Baker, F. T., additional, Berthot, J., additional, Bertin, P. Y., additional, Bertozzi, W., additional, Besson, A., additional, Bimbot, L., additional, Boeglin, W. U., additional, Brash, E. J., additional, Brown, D., additional, Calarco, J. R., additional, Cardman, L. S., additional, Chai, Z., additional, Chang, C.-C., additional, Chen, J.-P., additional, Chudakov, E., additional, Churchwell, S., additional, Cisbani, E., additional, Dale, D. S., additional, Leo, R. De, additional, Deur, A., additional, Diederich, B., additional, Domingo, J. J., additional, Epstein, M. B., additional, Ewell, L. A., additional, Fissum, K. G., additional, Fleck, A., additional, Fonvieille, H., additional, Frullani, S., additional, Gao, J., additional, Garibaldi, F., additional, Gasparian, A., additional, Gerstner, G., additional, Gilad, S., additional, Gilman, R., additional, Glamazdin, A., additional, Glashausser, C., additional, Gomez, J., additional, Gorbenko, V., additional, Green, A., additional, Hansen, J.-O., additional, Howell, C. R., additional, Huber, G. M., additional, Iodice, M., additional, de Jager, C. W., additional, Jaminion, S., additional, Jiang, X., additional, Jones, M. K., additional, Kahl, W., additional, Kelly, J. J., additional, Khayat, M., additional, Kramer, L. H., additional, Kumbartzki, G., additional, Kuss, M., additional, Lakuriki, E., additional, Laveissière, G., additional, LeRose, J. J., additional, Liang, M., additional, Lindgren, R. A., additional, Liyanage, N., additional, Lolos, G. J., additional, Macri, R., additional, Madey, R., additional, Malov, S., additional, Margaziotis, D. J., additional, Markowitz, P., additional, McCormick, K., additional, McIntyre, J. I., additional, Meer, R. L. J. van der, additional, Michaels, R., additional, Milbrath, B. D., additional, Mougey, J. Y., additional, Nanda, S. K., additional, Offermann, E. A. J. M., additional, Papandreou, Z., additional, Pentchev, L., additional, Petratos, G. G., additional, Piskunov, N. M., additional, Pomatsalyuk, R. I., additional, Prout, D. L., additional, Quéméner, G., additional, Ransome, R. D., additional, Raue, B. A., additional, Roblin, Y., additional, Roche, R., additional, Rutledge, G., additional, Rutt, P. M., additional, Saha, A., additional, Saito, T., additional, Sarty, A. J., additional, Smith, T. P., additional, Sorokin, P., additional, Strauch, S., additional, Suleiman, R., additional, Takahashi, K., additional, Templon, J. A., additional, Todor, L., additional, Ulmer, P. E., additional, Urciuoli, G. M., additional, Vernin, P., additional, Vlahovic, B., additional, Voskanyan, H., additional, Wijesooriya, K., additional, Wojtsekhowski, B. B., additional, Woo, R. J., additional, Xiong, F., additional, Zainea, G. D., additional, and Zhou, Z.-L., additional

Published
2005
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37. Simultaneous X-ray and UV spectroscopy of the Seyfert galaxy NGC 5548

Author

Steenbrugge, K. C., primary, Kaastra, J. S., additional, Crenshaw, D. M., additional, Kraemer, S. B., additional, Arav, N., additional, George, I. M., additional, Liedahl, D. A., additional, van der Meer, R. L. J., additional, Paerels, F. B. S., additional, Turner, T. J., additional, and Yaqoob, T., additional

Published
2005
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38. Dynamics of the quasielasticO16(e,e′p)reaction atQ2≈0.8(GeV∕c)2

Author

Fissum, K. G., primary, Liang, M., additional, Anderson, B. D., additional, Aniol, K. A., additional, Auerbach, L., additional, Baker, F. T., additional, Berthot, J., additional, Bertozzi, W., additional, Bertin, P.-Y., additional, Bimbot, L., additional, Boeglin, W. U., additional, Brash, E. J., additional, Breton, V., additional, Breuer, H., additional, Burtin, E., additional, Calarco, J. R., additional, Cardman, L. S., additional, Cates, G. D., additional, Cavata, C., additional, Chang, C. C., additional, Chen, J.-P., additional, Cisbani, E., additional, Dale, D. S., additional, de Jager, C. W., additional, De Leo, R., additional, Deur, A., additional, Diederich, B., additional, Djawotho, P., additional, Domingo, J., additional, Ducret, J.-E., additional, Epstein, M. B., additional, Ewell, L. A., additional, Finn, J. M., additional, Fonvieille, H., additional, Frois, B., additional, Frullani, S., additional, Gao, J., additional, Garibaldi, F., additional, Gasparian, A., additional, Gilad, S., additional, Gilman, R., additional, Glamazdin, A., additional, Glashausser, C., additional, Gomez, J., additional, Gorbenko, V., additional, Gorringe, T., additional, Hersman, F. W., additional, Holmes, R., additional, Holtrop, M., additional, d’Hose, N., additional, Howell, C., additional, Huber, G. M., additional, Hyde-Wright, C. E., additional, Iodice, M., additional, Jaminion, S., additional, Jones, M. K., additional, Joo, K., additional, Jutier, C., additional, Kahl, W., additional, Kato, S., additional, Kelly, J. J., additional, Kerhoas, S., additional, Khandaker, M., additional, Khayat, M., additional, Kino, K., additional, Korsch, W., additional, Kramer, L., additional, Kumar, K. S., additional, Kumbartzki, G., additional, Laveissière, G., additional, Leone, A., additional, LeRose, J. J., additional, Levchuk, L., additional, Lindgren, R. A., additional, Liyanage, N., additional, Lolos, G. J., additional, Lourie, R. W., additional, Madey, R., additional, Maeda, K., additional, Malov, S., additional, Manley, D. M., additional, Margaziotis, D. J., additional, Markowitz, P., additional, Martino, J., additional, McCarthy, J. S., additional, McCormick, K., additional, McIntyre, J., additional, van der Meer, R. L. J., additional, Meziani, Z.-E., additional, Michaels, R., additional, Mougey, J., additional, Nanda, S., additional, Neyret, D., additional, Offermann, E. A. J. M., additional, Papandreou, Z., additional, Perdrisat, C. F., additional, Perrino, R., additional, Petratos, G. G., additional, Platchkov, S., additional, Pomatsalyuk, R., additional, Prout, D. L., additional, Punjabi, V. A., additional, Pussieux, T., additional, Quéméner, G., additional, Ransome, R. D., additional, Ravel, O., additional, Roblin, Y., additional, Roche, R., additional, Rowntree, D., additional, Rutledge, G. A., additional, Rutt, P. M., additional, Saha, A., additional, Saito, T., additional, Sarty, A. J., additional, Serdarevic-Offermann, A., additional, Smith, T. P., additional, Soldi, A., additional, Sorokin, P., additional, Souder, P., additional, Suleiman, R., additional, Templon, J. A., additional, Terasawa, T., additional, Todor, L., additional, Tsubota, H., additional, Ueno, H., additional, Ulmer, P. E., additional, Urciuoli, G. M., additional, Vernin, P., additional, van Verst, S., additional, Vlahovic, B., additional, Voskanyan, H., additional, Watson, J. W., additional, Weinstein, L. B., additional, Wijesooriya, K., additional, Wojtsekhowski, B., additional, Zainea, D. G., additional, Zeps, V., additional, Zhao, J., additional, Zhou, Z.-L, additional, Udías, J. M., additional, Vignote, J. R., additional, Ryckebusch, J., additional, and Debruyne, D., additional

Published
2004
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39. Measurement of the Generalized Polarizabilities of the Proton in Virtual Compton Scattering atQ2=0.92and1.76GeV2

Author

Laveissière, G., primary, Todor, L., additional, Degrande, N., additional, Jaminion, S., additional, Jutier, C., additional, Di Salvo, R., additional, Van Hoorebeke, L., additional, Alexa, L. C., additional, Anderson, B. D., additional, Aniol, K. A., additional, Arundell, K., additional, Audit, G., additional, Auerbach, L., additional, Baker, F. T., additional, Baylac, M., additional, Berthot, J., additional, Bertin, P. Y., additional, Bertozzi, W., additional, Bimbot, L., additional, Boeglin, W. U., additional, Brash, E. J., additional, Breton, V., additional, Breuer, H., additional, Burtin, E., additional, Calarco, J. R., additional, Cardman, L. S., additional, Cavata, C., additional, Chang, C.-C., additional, Chen, J.-P., additional, Chudakov, E., additional, Cisbani, E., additional, Dale, D. S., additional, de Jager, C. W., additional, De Leo, R., additional, Deur, A., additional, d'Hose, N., additional, Dodge, G. E., additional, Domingo, J. J., additional, Elouadrhiri, L., additional, Epstein, M. B., additional, Ewell, L. A., additional, Finn, J. M., additional, Fissum, K. G., additional, Fonvieille, H., additional, Fournier, G., additional, Frois, B., additional, Frullani, S., additional, Furget, C., additional, Gao, H., additional, Gao, J., additional, Garibaldi, F., additional, Gasparian, A., additional, Gilad, S., additional, Gilman, R., additional, Glamazdin, A., additional, Glashausser, C., additional, Gomez, J., additional, Gorbenko, V., additional, Grenier, P., additional, Guichon, P. A. M., additional, Hansen, J. O., additional, Holmes, R., additional, Holtrop, M., additional, Howell, C., additional, Huber, G. M., additional, Hyde-Wright, C. E., additional, Incerti, S., additional, Iodice, M., additional, Jardillier, J., additional, Jones, M. K., additional, Kahl, W., additional, Kato, S., additional, Katramatou, A. T., additional, Kelly, J. J., additional, Kerhoas, S., additional, Ketikyan, A., additional, Khayat, M., additional, Kino, K., additional, Kox, S., additional, Kramer, L. H., additional, Kumar, K. S., additional, Kumbartzki, G., additional, Kuss, M., additional, Leone, A., additional, LeRose, J. J., additional, Liang, M., additional, Lindgren, R. A., additional, Liyanage, N., additional, Lolos, G. J., additional, Lourie, R. W., additional, Madey, R., additional, Maeda, K., additional, Malov, S., additional, Manley, D. M., additional, Marchand, C., additional, Marchand, D., additional, Margaziotis, D. J., additional, Markowitz, P., additional, Marroncle, J., additional, Martino, J., additional, McCormick, K., additional, McIntyre, J., additional, Mehrabyan, S., additional, Merchez, F., additional, Meziani, Z. E., additional, Michaels, R., additional, Miller, G. W., additional, Mougey, J. Y., additional, Nanda, S. K., additional, Neyret, D., additional, Offermann, E. A. J. M., additional, Papandreou, Z., additional, Pasquini, B., additional, Perdrisat, C. F., additional, Perrino, R., additional, Petratos, G. G., additional, Platchkov, S., additional, Pomatsalyuk, R., additional, Prout, D. L., additional, Punjabi, V. A., additional, Pussieux, T., additional, Quémenér, G., additional, Ransome, R. D., additional, Ravel, O., additional, Real, J. S., additional, Renard, F., additional, Roblin, Y., additional, Rowntree, D., additional, Rutledge, G., additional, Rutt, P. M., additional, Saha, A., additional, Saito, T., additional, Sarty, A. J., additional, Serdarevic, A., additional, Smith, T., additional, Smirnov, G., additional, Soldi, K., additional, Sorokin, P., additional, Souder, P. A., additional, Suleiman, R., additional, Templon, J. A., additional, Terasawa, T., additional, Tieulent, R., additional, Tomasi-Gustaffson, E., additional, Tsubota, H., additional, Ueno, H., additional, Ulmer, P. E., additional, Urciuoli, G. M., additional, Vanderhaeghen, M., additional, Van De Vyver, R., additional, Van der Meer, R. L. J., additional, Vernin, P., additional, Vlahovic, B., additional, Voskanyan, H., additional, Voutier, E., additional, Watson, J. W., additional, Weinstein, L. B., additional, Wijesooriya, K., additional, Wilson, R., additional, Wojtsekhowski, B. B., additional, Zainea, D. G., additional, Zhang, W-M., additional, Zhao, J., additional, and Zhou, Z.-L., additional

Published
2004
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40. Backward electroproduction ofπ0mesons on protons in the region of nucleon resonances at four momentum transfer squaredQ2=1.0GeV2

Author

Laveissière, G., primary, Degrande, N., additional, Jaminion, S., additional, Jutier, C., additional, Todor, L., additional, Di Salvo, R., additional, Van Hoorebeke, L., additional, Alexa, L. C., additional, Anderson, B. D., additional, Aniol, K. A., additional, Arundell, K., additional, Audit, G., additional, Auerbach, L., additional, Baker, F. T., additional, Baylac, M., additional, Berthot, J., additional, Bertin, P. Y., additional, Bertozzi, W., additional, Bimbot, L., additional, Boeglin, W. U., additional, Brash, E. J., additional, Breton, V., additional, Breuer, H., additional, Burtin, E., additional, Calarco, J. R., additional, Cardman, L. S., additional, Cavata, C., additional, Chang, C.-C., additional, Chen, J.-P., additional, Chudakov, E., additional, Cisbani, E., additional, Dale, D. S., additional, de Jager, C. W., additional, De Leo, R., additional, Deur, A., additional, d’Hose, N., additional, Dodge, G. E., additional, Domingo, J. J., additional, Elouadrhiri, L., additional, Epstein, M. B., additional, Ewell, L. A., additional, Finn, J. M., additional, Fissum, K. G., additional, Fonvieille, H., additional, Fournier, G., additional, Frois, B., additional, Frullani, S., additional, Furget, C., additional, Gao, H., additional, Gao, J., additional, Garibaldi, F., additional, Gasparian, A., additional, Gilad, S., additional, Gilman, R., additional, Glamazdin, A., additional, Glashausser, C., additional, Gomez, J., additional, Gorbenko, V., additional, Grenier, P., additional, Guichon, P. A. M., additional, Hansen, J. O., additional, Holmes, R., additional, Holtrop, M., additional, Howell, C., additional, Huber, G. M., additional, Hyde-Wright, C. E., additional, Incerti, S., additional, Iodice, M., additional, Jardillier, J., additional, Jones, M. K., additional, Kahl, W., additional, Kamalov, S., additional, Kato, S., additional, Katramatou, A. T., additional, Kelly, J. J., additional, Kerhoas, S., additional, Ketikyan, A., additional, Khayat, M., additional, Kino, K., additional, Kox, S., additional, Kramer, L. H., additional, Kumar, K. S., additional, Kumbartzki, G., additional, Kuss, M., additional, Leone, A., additional, LeRose, J. J., additional, Liang, M., additional, Lindgren, R. A., additional, Liyanage, N., additional, Lolos, G. J., additional, Lourie, R. W., additional, Madey, R., additional, Maeda, K., additional, Malov, S., additional, Manley, D. M., additional, Marchand, C., additional, Marchand, D., additional, Margaziotis, D. J., additional, Markowitz, P., additional, Marroncle, J., additional, Martino, J., additional, McCormick, K., additional, McIntyre, J., additional, Mehrabyan, S., additional, Merchez, F., additional, Meziani, Z. E., additional, Michaels, R., additional, Miller, G. W., additional, Mougey, J. Y., additional, Nanda, S. K., additional, Neyret, D., additional, Offermann, E. A. J. M., additional, Papandreou, Z., additional, Perdrisat, C. F., additional, Perrino, R., additional, Petratos, G. G., additional, Platchkov, S., additional, Pomatsalyuk, R., additional, Prout, D. L., additional, Punjabi, V. A., additional, Pussieux, T., additional, Quémenér, G., additional, Ransome, R. D., additional, Ravel, O., additional, Real, J. S., additional, Renard, F., additional, Roblin, Y., additional, Rowntree, D., additional, Rutledge, G., additional, Rutt, P. M., additional, Saha, A., additional, Saito, T., additional, Sarty, A. J., additional, Serdarevic, A., additional, Smith, T., additional, Smirnov, G., additional, Soldi, K., additional, Sorokin, P., additional, Souder, P. A., additional, Suleiman, R., additional, Templon, J. A., additional, Terasawa, T., additional, Tiator, L., additional, Tieulent, R., additional, Tomasi-Gustaffson, E., additional, Tsubota, H., additional, Ueno, H., additional, Ulmer, P. E., additional, Urciuoli, G. M., additional, Van De Vyver, R., additional, Van der Meer, R. L. J., additional, Vernin, P., additional, Vlahovic, B., additional, Voskanyan, H., additional, Voutier, E., additional, Watson, J. W., additional, Weinstein, L. B., additional, Wijesooriya, K., additional, Wilson, R., additional, Wojtsekhowski, B. B., additional, Zainea, D. G., additional, Zhang, W-M., additional, Zhao, J., additional, and Zhou, Z.-L., additional

Published
2004
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46. X-ray spectroscopy of NGC 5548

Author

Kaastra, J. S., primary, Steenbrugge, K. C., additional, Raassen, A. J. J., additional, van der Meer, R. L. J., additional, Brinkman, A. C., additional, Liedahl, D. A., additional, Behar, E., additional, and de Rosa, A., additional

Published
2002
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47. Dynamics of the16O(e,e′p)Reaction at High Missing Energies

Author

Liyanage, N., primary, Anderson, B. D., additional, Aniol, K. A., additional, Auerbach, L., additional, Baker, F. T., additional, Berthot, J., additional, Bertozzi, W., additional, Bertin, P.-Y, additional, Bimbot, L., additional, Boeglin, W. U., additional, Brash, E. J., additional, Breton, V., additional, Breuer, H., additional, Burtin, E., additional, Calarco, J. R., additional, Cardman, L., additional, Cates, G. D., additional, Cavata, C., additional, Chang, C. C., additional, Chen, J.-P., additional, Cisbani, E., additional, Dale, D. S., additional, De Leo, R., additional, Deur, A., additional, Diederich, B., additional, Djawotho, P., additional, Domingo, J., additional, Doyle, B., additional, Ducret, J.-E., additional, Epstein, M. B., additional, Ewell, L. A., additional, Finn, J. M., additional, Fissum, K. G., additional, Fonvieille, H., additional, Frois, B., additional, Frullani, S., additional, Gao, J., additional, Garibaldi, F., additional, Gasparian, A., additional, Gilad, S., additional, Gilman, R., additional, Glamazdin, A., additional, Glashausser, C., additional, Gomez, J., additional, Gorbenko, V., additional, Gorringe, T., additional, Hersman, F. W., additional, Holmes, R., additional, Holtrop, M., additional, d'Hose, N., additional, Howell, C., additional, Huber, G. M., additional, Hyde-Wright, C. E., additional, Iodice, M., additional, de Jager, C. W., additional, Jaminion, S., additional, Jones, M. K., additional, Joo, K., additional, Jutier, C., additional, Kahl, W., additional, Kato, S., additional, Kelly, J. J., additional, Kerhoas, S., additional, Khandaker, M., additional, Khayat, M., additional, Kino, K., additional, Korsch, W., additional, Kramer, L., additional, Kumar, K. S., additional, Kumbartzki, G., additional, Laveissière, G., additional, Leone, A., additional, LeRose, J. J., additional, Levchuk, L., additional, Liang, M., additional, Lindgren, R. A., additional, Lolos, G. J., additional, Lourie, R. W., additional, Madey, R., additional, Maeda, K., additional, Malov, S., additional, Manley, D. M., additional, Margaziotis, D. J., additional, Markowitz, P., additional, Martino, J., additional, McCarthy, J. S., additional, McCormick, K., additional, McIntyre, J., additional, van der Meer, R. L. J., additional, Meziani, Z.-E., additional, Michaels, R., additional, Mougey, J., additional, Nanda, S., additional, Neyret, D., additional, Offermann, E. A. J. M., additional, Papandreou, Z., additional, Perdrisat, C. F., additional, Perrino, R., additional, Petratos, G. G., additional, Platchkov, S., additional, Pomatsalyuk, R., additional, Prout, D. L., additional, Punjabi, V. A., additional, Pussieux, T., additional, Quéméner, G., additional, Ransome, R. D., additional, Ravel, O., additional, Roblin, Y., additional, Roche, R., additional, Rowntree, D., additional, Rutledge, G. A., additional, Rutt, P. M., additional, Saha, A., additional, Saito, T., additional, Sarty, A. J., additional, Serdarevic-Offermann, A., additional, Smith, T. P., additional, Soldi, A., additional, Sorokin, P., additional, Souder, P., additional, Suleiman, R., additional, Templon, J. A., additional, Terasawa, T., additional, Todor, L., additional, Tsubota, H., additional, Ueno, H., additional, Ulmer, P. E., additional, Urciuoli, G. M., additional, Vernin, P., additional, van Verst, S., additional, Vlahovic, B., additional, Voskanyan, H., additional, Watson, J. W., additional, Weinstein, L. B., additional, Wijesooriya, K., additional, Wilson, R., additional, Wojtsekhowski, B., additional, Zainea, D. G., additional, Zeps, V., additional, Zhao, J., additional, and Zhou, Z.-L., additional

Published
2001
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48. Measurement of the Charged Pion Electromagnetic Form Factor

Author

Volmer, J., primary, Abbott, D., additional, Anklin, H., additional, Armstrong, C., additional, Arrington, J., additional, Assamagan, K., additional, Avery, S., additional, Baker, O. K., additional, Blok, H. P., additional, Bochna, C., additional, Brash, E. J., additional, Breuer, H., additional, Chant, N., additional, Dunne, J., additional, Eden, T., additional, Ent, R., additional, Gaskell, D., additional, Gilman, R., additional, Gustafsson, K., additional, Hinton, W., additional, Huber, G. M., additional, Jackson, H., additional, Jones, M. K., additional, Keppel, C., additional, Kim, P. H., additional, Kim, W., additional, Klein, A., additional, Koltenuk, D., additional, Liang, M., additional, Lolos, G. J., additional, Lung, A., additional, Mack, D. J., additional, McKee, D., additional, Meekins, D., additional, Mitchell, J., additional, Mkrtchyan, H., additional, Mueller, B., additional, Niculescu, G., additional, Niculescu, I., additional, Pitz, D., additional, Potterveld, D., additional, Qin, L. M., additional, Reinhold, J., additional, Shin, I. K., additional, Stepanyan, S., additional, Tadevosyan, V., additional, Tang, L. G., additional, van der Meer, R. L. J., additional, Vansyoc, K., additional, Van Westrum, D., additional, Vulcan, W., additional, Wood, S., additional, Yan, C., additional, Zhao, W.-X., additional, and Zihlmann, B., additional

Published
2001
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49. Interstellar X‐Ray Absorption Spectroscopy of Oxygen, Neon, and Iron with theChandraLETGS Spectrum of X0614+091

Author

Paerels, Frits, primary, Brinkman, A. C., additional, van der Meer, R. L. J., additional, Kaastra, J. S., additional, Kuulkers, E., additional, Boggende, A. J. F. den, additional, Predehl, P., additional, Drake, Jeremy J., additional, Kahn, Steven M., additional, Savin, Daniel W., additional, and McLaughlin, Brendan M., additional

Published
2001
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50. Simultaneous X-ray and ultraviolet spectroscopy of the Seyfert galaxy NGC 5548

Author

Kaastra, J. S., Steenbrugge, K. C., Crenshaw, D. M., Kraemer, S. B., Arav, N., George, I. M., Liedahl, D. A., van der Meer, R. L. J., Paerels, F. B. S., Turner, T. J., Yaqoob, T., Kaastra, J. S., Steenbrugge, K. C., Crenshaw, D. M., Kraemer, S. B., Arav, N., George, I. M., Liedahl, D. A., van der Meer, R. L. J., Paerels, F. B. S., Turner, T. J., and Yaqoob, T.

Abstract

The Seyfert 1 galaxy NGC 5548 was observed for a week by Chandra using both the HETGS and LETGS spectrometers. In this paper we study the time variability of the continuum radiation. During our observation, the source showed a gradual increase in flux over four days, followed by a rapid decrease and flattening of the light curve afterwards. Superimposed upon these relatively slow variations several short duration bursts or quasi-periodic oscillations occured with a typical duration of several hours and separation between 0.6–0.9 days. The bursts show a delay of the hard X-rays with respect to the soft X-rays of a few hours. We interpret these bursts as occurring due to a rotating, fluctuating hot spot at approximately 10 gravitational radii; the time delay of the hard X-rays from the bursts agrees with the canonical picture of Inverse Compton scattering of the soft accretion disk photons on a hot medium that is relatively close to the central black hole.

Published
2004
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