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9. HST STIS spectroscopy of the triple nucleus of M31: two nested disks in Keplerian rotation around a Supermassive Black Hole

Author

Bender, Ralf, Kormendy, John, Bower, Gary, Green, Richard, Thomas, Jens, Danks, Anthony C., Gull, Theodore, Hutchings, J. B., Joseph, C. L., Kaiser, M. E., Lauer, Tod R., Nelson, Charles H., Richstone, Douglas, Weistrop, Donna, and Woodgate, Bruce

Subjects
Astrophysics
Abstract

We present HST spectroscopy of the nucleus of M31 obtained with STIS. Spectra taken around the CaT lines at 8500 see only the red giants in the double bright- ness peaks P1 and P2. In contrast, spectra taken at 3600-5100 A are sensitive to the tiny blue nucleus embedded in P2, the lower surface brightness red nucleus. P2 has a K-type spectrum, but the embedded blue nucleus has an A-type spectrum with strong Balmer absorption lines. Given the small likelihood for stellar collisions, a 200 Myr old starburst appears to be the most plausible origin of the blue nucleus. In stellar population, size, and velocity dispersion, the blue nucleus is so different from P1 and P2 that we call it P3. The line-of-sight velocity distributions of the red stars in P1+P2 strengthen the support for Tremaine s eccentric disk model. The kinematics of P3 is consistent with a circular stellar disk in Keplerian rotation around a super-massive black hole with M_bh = 1.4 x 10^8 M_sun. The P3 and the P1+P2 disks rotate in the same sense and are almost coplanar. The observed velocity dispersion of P3 is due to blurred rotation and has a maximum value of sigma = 1183+-201 km/s. The observed peak rotation velocity of P3 is V = 618+-81 km/s at radius 0.05" = 0.19 pc corresponding to a circular rotation velocity at this radius of ~1700 km/s. Any dark star cluster alternative to a black hole must have a half-mass radius <= 0.03" = 0.11 pc. We show that this excludes clusters of brown dwarfs or dead stars on astrophysical grounds., Comment: Astrophysical Journal, Sep 20, 2005, 21 pages including 20 figures

Published
2005
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10. Complex C: A Low-Metallicity High-Velocity Cloud Plunging into the Milky Way

Author

Tripp, T. M., Wakker, B. P., Jenkins, E. B., Bowers, C. W., Danks, A. C., Green, R. F., Heap, S. R., Joseph, C. L., Kaiser, M. E., Linsky, J. L., and Woodgate, B. E.

Subjects
Astrophysics
Abstract

(Abridged) We present a new high-resolution (7 km/s FWHM) echelle spectrum of 3C 351 obtained with STIS. 3C 351 lies behind the low-latitude edge of high-velocity cloud Complex C, and the new spectrum provides accurate measurements of O I, Si II, Al II, Fe II, and Si III absorption lines at the velocity of the HVC. We use collisional and photoionization models to derive ionization corrections; in both models we find that the overall metallicity Z = 0.1 - 0.3 Z_{solar} in Complex C, but nitrogen must be underabundant. The iron abundance indicates that Complex C contains very little dust. The absorbing gas probably is not gravitationally confined. The gas could be pressure-confined by an external medium, but alternatively we may be viewing the leading edge of the HVC, which is ablating and dissipating as it plunges into the Milky Way. O VI column densities observed with FUSE toward nine QSOs/AGNs behind Complex C support this conclusion: N(O VI) is highest near 3C 351, and the O VI/H I ratio increases substantially with decreasing latitude, suggesting that the lower-latitude portion of the cloud is interacting more vigorously with the Galaxy. The other sight lines through Complex C show some dispersion in metallicity, but with the current uncertainties, the measurements are consistent with a constant metallicity throughout the HVC. However, all of the Complex C sight lines require significant nitrogen underabundances. Finally, we compare the 3C 351 sight line to the sight line to the nearby QSO H1821+643 to search for evidence of outflowing Galactic fountain gas that could be mixing with Complex C. We find that the intermediate-velocity gas detected toward 3C 351 and H1821+643 has a higher metallicity and may well be a fountain/chimney outflow from the Perseus spiral arm., Comment: Submitted to AJ. Figures 1-4 compressed for astro-ph; better quality figures are available at http://astro.princeton.edu/~tripp/astro/qualitypreps/complexc.ps.gz

Published
2003
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11. The Heavy Element Enrichment of Lyman alpha Clouds in the Virgo Supercluster

Author

Tripp, T. M., Jenkins, E. B., Williger, G. M., Heap, S. R., Bowers, C. W., Danks, A. C., Dave', R., Green, R. F., Gull, T. R., Joseph, C. L., Kaiser, M. E., Lindler, D., Weymann, R. J., and Woodgate, B. E.

Subjects
Astrophysics
Abstract

Using high S/N STIS echelle spectra (FWHM=7 km/s) of 3C 273, we constrain the metallicities of two Lya clouds in the vicinity of the Virgo cluster. We detect C II, Si II, and Si III absorption lines in the Lya absorber at z = 0.00530. Previous observations with FUSE have revealed Ly beta - Ly theta lines at this redshift, thereby accurately constraining N(H I). We model the ionization of the gas and derive [C/H] = -1.2^{+0.3}_{-0.2}, [Si/C] = 0.2+/-0.1, and log n_{H} = -2.8+/-0.3. The model implies a small absorber thickness, ~70 pc, and thermal pressure p/k ~ 40 cm^{-3} K. It is most likely that the absorber is pressure confined by an external medium because gravitational confinement would require a very high ratio of dark matter to baryonic matter. Based on Milky Way sight lines in which carbon and silicon abundances have been reliably measured in the same interstellar cloud (including new measurements presented herein), we argue that the overabundance of Si relative to C is not due to dust depletion. Instead, this probably indicates that the gas has been predominately enriched by Type II supernovae. Such enrichment is most plausibly provided by an unbound galactic wind, given the absence of galaxies within a projected distance of 100 kpc and the presence of galaxies capable of driving a wind at larger distances. We also constrain the metallicity and physical conditions of the Virgo absorber at z = 0.00337 based on detections of O VI and H I and an upper limit on C IV. If this absorber is collisionally ionized, the O VI/C IV limit requires T > 10^{5.3} K. For either collisional ionization or photoionization, we find that [O/H] > -2.0 at z = 0.00337., Comment: Final Ap.J. version

Published
2002
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12. High Velocity Line Emission in the NLR of NGC 4151

Author

Hutchings, J. B., Crenshaw, D. M., Danks, A. C., Gull, T. R., Kraemer, S. B., Nelson, C. H., Weistrop, D., Kaiser, M. E., and Joseph, C. L.

Subjects
Astrophysics
Abstract

Narrow-band imaging of the nuclear region of NGC 4151 with the Hubble Space Telescope is presented. The filter bandpasses isolate line emission in various high velocity ranges in several ions. Slitless and long-slit spectra of the region with the Space Telescope Imaging Spectrograph also indicate the locations of high velocity gas. These emission regions are faint and are interspersed among the bright emission clouds seen in direct images. They have radial velocities up to 1400 km/s relative to the nucleus, and are found in both approach and recession on both sides of the nucleus. This contrasts strongly with the bright emission line clouds which have been discussed previously as showing bidirectional outflow with velocities within 400 km/s of the nucleus. We discuss the possible connections of the high velocity material with the radio jet and the nuclear radiation., Comment: 12 pages plus 6 figures, to be published in AJ

Published
1999
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13. UV Absorption Lines from High-Velocity Gas in the Vela Supernova Remnant: New insights from STIS Echelle Observations of HD72089

Author

Jenkins, E. B., Tripp, T. M., Fitzpatrick, E. L., Lindler, D., Danks, A. C., Beck, T. L., Bowers, C. W., Joseph, C. L., Kaiser, M. E., Kimble, R. A., Kraemer, S. B., Robinson, R. D., Timothy, J. G., Valenti, J. A., and Woodgate, B. E.

Subjects
Astrophysics
Abstract

The star HD72089 is located behind the Vela supernova remnant and shows a complex array of high and low velocity interstellar absorption features arising from shocked clouds. A spectrum of this star was recorded over the wavelength range 1196.4 to 1397.2 Angstroms at a resolving power lambda/Delta lambda = 110,000 and signal-to-noise ratio of 32 by STIS on the Hubble Space Telescope. We have identified 7 narrow components of C I and have measured their relative populations in excited fine-structure levels. Broader features at heliocentric velocities ranging from -70 to +130 km/s are seen in C II, N I, O I, Si II, S II and Ni II. In the high-velocity components, the unusually low abundances of N I and O I, relative to S II and Si II, suggest that these elements may be preferentially ionized to higher stages by radiation from hot gas immediately behind the shock fronts., Comment: 11 pages, 2 figures, Latex. Submitted for the special HST ERO issue of the Astrophysical Journal Letters

Published
1997
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14. Recovering an Experience of the Word: "The Anabaptist Vision" and "the Primal Imagination".

Author

SAWATZKY, JOSEPH C. L.

Abstract

Two phrases allude to the creative tension at the heart of my sojourn from 2006-2014 as a North American Mennonite missionary Bible teacher among African Initiated Churches (AICs) and Pentecostals in South Africa: "the Anabaptist Vision" and "the Primal Imagination.- The former phrase comes from Harold S. Bender. a twentieth-century Mennonite scholar of sixteenth-century Anabaptism. who distilled from his historical research a theological identity to anchor a pacifist people in a time of war.1 The "Primal Imagination" is borrowed from Kwame Bediako (1945-2008), the Ghanaian theologian who perceived "the opportunity for a new theological idiom-through African and other -non-Western" apprehensions of Christian religion.2 Both "the Anabaptist Vision" and -the Primal Imagination" lay claims on my identity as a Christian. which presents no easy predicament considering that the Vision neglects certain dimensions of religion inherent to the imagination. In what follows I will 1) review The .4nabaptist I ision. Bender's classic essay. in terms of its omission of worship and experience from "the essence of Christianity."3 2) trace Bediako's account of 'the primal imagination" in terms of its central concept of -participation'- while glancing at comparable epistemological descriptions. and 3) conclude by using a personal case study in mission to show how the "primal imagination" may aid iii the recovery of an -Anabaptist" experience of. or participation iii, the Word. [ABSTRACT FROM AUTHOR]

Published
2023

15. Black-Hole Results from STIS

Author

Olling, Rob P., Merritt, D., Joseph, C. L., Valluri, M., Kaper, Lex, editor, Heuvel, Edward P. J. van den, editor, and Woudt, Patrick A., editor

Published
2001
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18. The Space Telescope Imaging Spectrograph Design 1

Author

Woodgate, B. E., Kimble, R. A., Bowers, C. W., Kraemer, S., Kaiser, M. E., Danks, A. C., Grady, J. F., Loiacono, J. J., Brumfield, M., Feinberg, L., Gull, T. R., Heap, S. R., Maran, S. P., Lindler, D., Hood, D., Meyer, W., VanHouten, C., Argabright, V., Franka, S., Bybee, R., Dorn, D., Bottema, M., Woodruff, R., Michika, D., Sullivan, J., Hetlinger, J., Ludtke, C., Stocker, R., Delamere, A., Rose, D., Becker, I., Garner, H., Timothy, J. G., Blouke, M., Joseph, C. L., Hartig, G., Green, R. F., Jenkins, E. B., Linsky, J. L., Hutchings, J. B., Moos, H. W., Boggess, A., Roesler, F., and Weistrop, D.

Published
1998
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20. Chemical transitions for interstellar C2 and CN in cloud envelopes

Author

Federman, S. R, Strom, C. J, Lambert, D. L, Cardelli, Jason A, Smith, V. V, and Joseph, C. L

Subjects
Astrophysics
Abstract

Observations were made of absorption from CH, C2, and CN toward moderately reddened stars in Sco, OB2, Ceo OB3, and Taurus/Auriga. For these directions, most of the reddening is associated with a single cloud complex, for example, the rho Ophiuchus molecular cloud, and as a result, the observations probe moderately dense material. When combined with avaliable data for nearby directions, the survey provides the basis for a comprehensive analysis of the chemistry for these species. The chemical transitions affecting C2 and CN in cloud envelopes were analyzed. The depth into a cloud at which a transition takes place was characterized by tau(sub uv), the grain optical depth at 1000 A. One transition at tau(sub uv) approx. = 2, which arises from, the conversion of C(+) into CO, affects the chemistries for both molecules because of the key role this ion plays. A second one involving production terms in the CN chemistry occurs at tau(sub uv) of approx. = 3; neutral reactions which C2 and CH is more important at larger values for tau(sub uv). The transition from photodissociation to chemical destruction takes place at tau(sub uv) approx. = 4.5 for C2 and CN. The observational data for stars in Sco OB2, Cep OB3, and Taurus/Auriga were studied with chemical rate equations containing the most important production and destruction mechanisms. Because the sample of stars in Sco OB2 includes sight lines with A(sub v) ranging from 1-4 mag, sight lines dominated by photochemistry could be analyzed separately from those controlled by gas-phase destruction. The analysis yielded values for two poorly known rate constants for reactions involved in the production of CN; the reactions are C2 + N yields CN + C and C(+) + NH yields all products. The other directions were analyzed with the inferred values. The predicted column densities for C2 and CN agree with the observed values to better than 50%, and in most instances 20%. When combining the estimates for density and temperature derived from chemical modeling and molecular excitation for a specific cloud, such as the rho Ophiuchus molecular cloud, the portion of the cloud envelope probed by C2 and CN absorption was found to be in pressure equilibrium.

Published
1994
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21. New technologies for UV detectors

Author

Joseph, C. L

Subjects
Optics
Abstract

Several technologies are currently being developed, leading to substantial improvements in the performance of UV detectors or significant reductions in power or weight. Four technologies discussed are (1) thin-film coatings to enhance the UV sensitivity of CCD's, (2) highly innovative magnet assemblies that dramatically reduce weight and result in virtually no external flux, (3) new techniques for curving microchannel plates (MCP's) so that single plates can be used to prevent ion feedback and present highly localized charge clouds to an anode structure, and (4) high-performance alternatives to glass-based MCP's. In item (2), for example, very robust magnets are made out of rare earth materials such as samarium cobalt, and cladding magnets are employed to prevent flux from escaping from the detector into the external environment. These new ultralight magnet assemblies are able to create strong, exceptionally uniform magnetic fields for image intensification and focusing of photoelectrons. The principle advantage of such detectors is the quantum efficiencies of 70-80 percent obtained throughout ultraviolet wavelengths (900-2000 A), the highest of any device. Despite the improvements achieved under item (3), high-performance alternatives to conventional glass-based MCP's potentially offer three distinct new advantages that include (1) a 30-100-fold improvement in dynamic range resulting in correspondingly higher signal-to-noise ratios, (2) the use of pure dielectric and semiconductor materials that will not outgas contaminants that eventually destroy photocathodes, and (3) channels that have constant spacing providing long-ranged order since the plates are made using photolithography techniques from the semiconductor industry. The manufacturers of these advanced-technology MCP's, however, are a couple of years away from actually producing a functioning image intensifier. In contrast to the use of CCD's for optical, ground based observations, there is no single detector technology in the ultraviolet that dominates or is as universally suitable for all applications. Thus, several technological problems, recent advances, and the impact that these new enabling technologies represent for UV applications are addressed.

Published
1993

25. Background and Context

Author

Anne Chapman and Joseph C. L. Tan

Subjects
Education reform, Globalization, Work (electrical), media_common.quotation_subject, Political science, Professional development, Section (typography), Institution, Context (language use), Public administration, Key features, media_common
Abstract

This chapter locates the research project that is the focus of this book in the context of international, national and local education trends and reforms. The first section of the chapter outlines the challenges and impact of globalization on education and explores educational reforms in the United States of America (USA), the United Kingdom (UK) and Australia. The second section describes recent trends and issues in contemporary educational change in countries in Asia. The third section addresses the historical development of education reforms in Singapore. The final section describes key features of the Integrated Programme and Project Work delivered at Hwa Chong Institution, the case study school.

Published
2016
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26. Overview of the Issues

Author

Anne Chapman and Joseph C. L. Tan

Subjects
Authentic learning, Work (electrical), ComputingMilieux_COMPUTERSANDEDUCATION, Mathematics education, Psychology, Curriculum, Independent learning, Experiential learning
Abstract

This book reports research aimed at developing understandings of the impact of a research-based project work learning curriculum on independent learning. A case study examined the views and experiences of students at Singapore’s Hwa Chong Instution, who were engaged in a rigourous secondary school curriculum developed to offer an independent, customized and experiential learning experience for academically-able students.

Published
2016
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29. Findings and Discussion

Author

Anne Chapman and Joseph C. L. Tan

Subjects
Work (electrical), ComputingMilieux_COMPUTERSANDEDUCATION, Mathematics education, Collaborative learning, Psychology, Independent learning, Curriculum, Project group
Abstract

The previous chapter presented the empirical findings according to the guiding questions, from the perspectives of students who were engaged in research-based project work in one of five courses of study at one school. Drawing on the emergent themes, this chapter develops seven theoretical propositions about the ways in which students a engaged with research-based project work curriculum deal with independent learning. The propositions are discussed below

Published
2016
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31. CHECKLIST FOR COMMERCIAL REAL ESTATE TAX ACQUISITIONS

Author

Hatcher, Stephen B. and Wettach, Joseph C. L.

Subjects
Real estate industry -- Management, Real estate development -- Planning, Business, Business, regional
Abstract

The acquisition of commercial real estate, whether an existing building or a vacant parcel for development, presents a myriad of issues which the potential buyer should consider. The following is [...]

Published
2000

32. BackMatter.

Author

Tan, Joseph C. L. and Chapman, Anne

Published
2016

33. FrontMatter.

Author

Tan, Joseph C. L. and Chapman, Anne

Published
2016

35. Search for $\nu\mu \to \nu_{e}$ Oscillations in the NOMAD Experiment

Author

Astier, Pierre, Autiero, D, Baldisseri, Alberto, Baldo-Ceolin, Massimilla, Banner, M, Bassompierre, Gabriel, Benslama, K, Besson, N, Bird, I, Blumenfeld, B, Bobisut, F, Bouchez, J, Boyd, S, Bueno, A G, Bunyatov, S, Camilleri, L L, Cardini, A, Cattaneo, Paolo Walter, Cavasinni, V, Cervera-Villanueva, A, Challis, R C, Chukanov, A, Collazuol, G, Conforto, G, Conta, C, Contalbrigo, M, Cousins, R, Daniels, D, Degaudenzi, H M, Del Prete, T, De Santo, A, Dignan, T, Di Lella, L, do Couto e Silva, E, Dumarchez, J, Ellis, M, Feldman, G J, Ferrari, R, Ferrère, D, Flaminio, Vincenzo, Fraternali, M, Gaillard, J M, Gangler, E, Geiser, A, Geppert, D, Gibin, D, Gninenko, S N, Godley, A, Gómez-Cadenas, J J, Gosset, J, Gössling, C, Gouanère, M, Grant, A, Graziani, G, Guglielmi, A M, Hagner, C, Hernando, J A, Hubbard, D B, Hurst, P, Hyett, N, Iacopini, E, Joseph, C L, Juget, F R, Kent, N, Kirsanov, M M, Klimov, O, Kokkonen, J, Kovzelev, A, Krasnoperov, A V, Kustov, D, Lacaprara, S, Lachaud, C, Lakic, B, Lanza, A, La Rotonda, L, Laveder, M, Letessier-Selvon, A A, Lévy, J M, Linssen, Lucie, Ljubicic, A, Long, J, Lupi, A, Marchionni, A, Martelli, F, Méchain, X, Mendiburu, J P, Meyer, J P, Mezzetto, Mauro, Mishra, S R, Moorhead, G F, Naumov, D V, Nédélec, P, Nefedov, Yu A, Nguyen-Mau, C, Orestano, D, Pastore, F, Peak, L S, Pennacchio, E, Pessard, H, Petti, R, Placci, A, Polesello, G, Pollmann, D, Polyarush, A Yu, Popov, B, Poulsen, C, Rebuffi, L, Renò, R, Rico, J, Riemann, P, Roda, C, Rubbia, André, Salvatore, F, Schahmaneche, K, Schmidt, B, Schmidt, T, Sconza, A, Sevior, M E, Sillou, D, Soler, F J P, Sozzi, G, Steele, D, Stiegler, U, Stipcevic, M, Stolarczyk, T, Tareb-Reyes, M, Taylor, G, Tereshchenko, V V, Toropin, A N, Touchard, A M, Tovey, Stuart N, Tran, M T, Tsesmelis, E, Ulrichs, J, Vacavant, L, Valdata-Nappi, M, Valuev, V Y, Vannucci, François, Varvell, K E, Veltri, M, Vercesi, V, Vidal-Sitjes, G, Vieira, J M, Vinogradova, T G, Weber, F V, Weisse, T, Wilson, F F, Winton, L J, Yabsley, B D, Zaccone, Henri, Zuber, K, and Zuccon, P

Subjects
High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

We present the results of a search for nu(mu)-->nu(e) oscillations in the NOMAD experiment at CERN. The experiment looked for the appearance of nu(e) in a predominantly nu(mu) wide-band neutrino beam at the CERN SPS. No evidence for oscillations was found. The 90% confidence limits obtained are delta m^2 < 0.4 eV^2 for maximal mixing and sin^2(2theta) < 1.4x10^{-3} for large delta m^2. This result excludes the LSND allowed region of oscillation parameters with delta m^2 > 10 eV^2.

Published
2003

36. A study of backward going $p$ and $\pi^{-}$ in $\nu_{\mu}CC$ interactions with the NOMAD detector

Author

Astier, P., Autiero, D., Baldisseri, A., Baldo-Ceolin, M., Banner, M., Bassompierre, G., Besson, N., Bird, I., Blumenfeld, B., Bobisut, F., Bouchez, J., Boyd, S., Bueno, A., Bunyatov, S. A., Camilleri, L., Cardini, A., Cattaneo, P. W., Cavasinni, V., Cervera-Villanueva, A., Chukanov, A., Collazuol, G., Conforto, G., Conta, C., Contalbrigo, M., Cousins, R., Daniels, D., Degaudenzi, H., Del Prete, T., Santo, A., Dignan, T., Di Lella, L., Do Couto, E. Silva E., Dumarchez, J., Ellis, M., Fazio, T., Feldman, G. J., Ferrari, R., Ferrere, D., Flaminio, V., Fraternali, M., Gaillard, J. M., Gangler, E., Geiser, A., Geppert, D., Gibin, D., Gninenko, S., Godley, A., Gomez-Cadenas, J. J., Gosset, J., Gossling, C., Gouanere, M., Grant, A., Graziani, G., Guglielmi, A., Hagner, C., Hernando, J., Hubbard, D., Hurst, P., Hyett, N., Iacopini, E., Joseph, C. L., Juget, F., Kirsanov, M., Klimov, O., Kokkonen, J., Kovzelev, A., Krasnoperov, A., Kustov, D., Kuznetsov, V., Lacaprara, S., Lachaud, C., Lakic, B., Lanza, A., Laveder, M., antoine letessier selvon, Levy, J. M., Linssen, L., Ljubicic, A., Long, J., Lupi, A., Marchionni, A., Martelli, F., Mechain, X., Mendiburu, J. P., Meyer, J. P., Mezzetto, M., Mishra, S. R., Moorhead, G. F., Naumov, D., Nedelec, P., Yu. Nefedov, Nguyen-Mau, C., Orestano, D., Pastore, F., Peak, L. S., Pennacchio, E., Pessard, H., Petti, R., Placci, A., Polesello, G., Pollmann, D., Polyarush, A., Popov, B., Poulsen, C., Rico, J., Riemann, P., Roda, C., Rubbia, A., Salvatore, F., Schahmaneche, K., Schmidt, B., Schmidt, T., Sevior, M., Sillou, D., Soler, F. J. P., Gabriella Sozzi, Steele, D. D., Stiegler, U., Stipcevic, M., Stolarczyk, T., Tareb-Reyes, M., Taylor, G. N., Tereshchenko, V., Toropin, A., Touchard, A. M., Tovey, S. N., Tran, M. T., Tsesmelis, E., Ulrichs, J., Vacavant, L., Valdata-Nappi, M., Valuev, V., Vannucci, F., Varvell, K. E., Veltri, M., Vercesi, V., Vidal-Sitjes, G., Vieira, J. M., Vinogradova, T., Weber, F. V., Weisse, T., Wilson, F. F., Winton, L. J., Yabsley, B. D., Zaccone, H., Zuber, K., Zuccon, P., Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), NOMAD, and BOMBAR, Claudine

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

Backward proton and $\pi^-$ production has been studied in \numucc interactions with carbon nuclei. Detailed analyses of the momentum distributions, of the production rates, and of the general features of events with a backward going particle, have been carried out in order to understand the mechanism producing these particles. The backward proton data have been compared with the predictions of the reinteraction and the short range correlation models.

Published
2001

37. Search For $D^{o}$ Meson Production In P-P Interactions At A Center-of-mass Energy Of 53 gev

Author

Alder, J C, Block, M, Böhm, A, Ceradini, F, DiBitonto, Daryl, Joseph, C L, Kernan, A, Layter, J, Müller, F, Nakkasyan, A, Naroska, Beate, Nussbaum, M, Orkin-Lecourtois, A, Perroud, Jean-Pierre, Rubbia, Carlo, Schinzel, D, Seebrunner, H J, Shen, B, Staude, A, Tirler, R, Tran, M, VanDalen, G J, Voss, Rüdiger, and Zupancic, Crtomir

Subjects
XX
Published
2000

38. A More Sensitive Search for $\nu_{\mu} \to \nu_{\tau}$ Oscillations in NOMAD

Author

Astier, Pierre, Autiero, D, Baldisseri, Alberto, Baldo-Ceolin, Massimilla, Ballocchi, G, Banner, M, Bassompierre, Gabriel, Benslama, K, Besson, N, Bird, I G, Blumenfeld, B, Bobisut, F, Bouchez, J, Boyd, S, Bueno, A G, Bunyatov, S A, Camilleri, L L, Cardini, A, Cattaneo, Paolo Walter, Cavasinni, V, Cervera-Villanueva, A, Collazuol, G, Conforto, G, Conta, C, Contalbrigo, M, Cousins, R D, Daniels, D C, Degaudenzi, H M, Del Prete, T, De Santo, A, Dignan, T, Di Lella, L, do Couto e Silva, E, Donnelly, I J, Dumarchez, J, Ellis, M, Fazio, T, Feldman, G J, Ferrari, R, Ferrère, D, Flaminio, Vincenzo, Fraternali, M, Gaillard, Jean-Marc, Gandolfo, A, Gangler, E, Geiser, A, Geppert, D, Gibin, D, Gninenko, S N, Godley, A, Gómez-Cadenas, J J, Gosset, J, Gössling, C, Gouanère, M, Grant, A, Graziani, G, Guglielmi, A M, Hagner, C, Hernando, J, Hubbard, D B, Hurst, P, Hyett, N, Iacopini, E, Joseph, C L, Juget, F R, Kirsanov, M M, Klimov, O L, Kokkonen, J, Kovzelev, A, Krasnoperov, A V, Kuznetsov, V E, Lacaprara, S, Lachaud, C, Lakic, B, Lanza, A, La Rotonda, L, Laveder, M, Letessier-Selvon, A A, Lévy, J M, Linssen, Lucie, Ljubicic, A, Long, J, Lupi, A, Manola-Poggioli, E, Marchionni, A, Martelli, F, Méchain, X, Mendiburu, J P, Meyer, J P, Mezzetto, Mauro, Mishra, S R, Moorhead, G F, Mossuz, L, Nédélec, P, Nefedov, Yu A, Nguyen-Mau, C, Orestano, D, Pastore, F, Peak, L S, Pennacchio, E, Pessard, H, Petti, R, Placci, Alfredo, Pluquet, A, Polesello, G, Pollmann, D, Popov, B, Poulsen, C, Rathouit, P, Renò, R, Renzoni, G, Rico, J, Riemann, P, Roda, C, Rubbia, André, Salvatore, F, Schahmaneche, K, Schmidt, B, Schmidt, T, Segneri, G, Sevior, M E, Sillou, D, Soler, F J P, Sozzi, G, Steele, D, Steininger, M, Stiegler, U, Stipcevic, M, Stolarczyk, T, Tareb-Reyes, M, Taylor, G N, Tereshchenko, V V, Toropin, A N, Touchard, A M, Tovey, Stuart N, Tran, M T, Tsesmelis, E, Ulrichs, J, Vacavant, L, Valdata-Nappi, M, Valuev, V Yu, Vannucci, François, Varvell, K E, Veltri, M, Vercesi, V, Verkindt, D, Vieira, J M, Vinogradova, T G, Vo, M K, Volkov, S, Weber, F V, Weisse, T, Wilson, F F, Winton, L J, Yabsley, B D, Zaccone, Henri, Zuber, K, and Zuccon, P

Subjects
High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

With additional data and improved algorithms, we have enhanced the sensitivity of our appearance search for $\numunutau$ oscillations in the NOMAD detector in the CERN-SPS wide-band neutrino beam. The search uses kinematic criteria to identify $\nutau$ charged current interactions followed by decay of the $\tau^-$ to one of several decay modes. Our ``blind'' analyses of deep-inelastic scattering data taken in 1996 and 1997, combined with consistent reanalyses of previously reported 1995 data, yield no oscillation signal. For the two-family oscillation scenario, we present the contour outlining a 90\% C.L. confidence region in the $\sin^22\theta_{\mu \tau} - \Delta m^2$ plane. At large $\Delta m^2$, the confidence region includes $\sin^22\theta_{\mu\tau}\

Published
1999

39. A new determination of $\alpha_s$ using direct photon production cross sections in $pp$ and $\overline{p}p$ collisions at $\sqrt{s}=24.3$ GeV

Author

Werlen, M, Ballocchi, G, Breedon, R E, Camilleri, L L, Comtat, C, Cool, R L, Cox, P T, Cushman, P B, Dick, Louis, Dukes, E C, Giacomelli, P, Hubbard, D B, Jeanneret, J B, Joseph, C L, Kubischta, Werner, Morel, Christian, Nguyen-Mau, C, Oberson, P, Overseth, O E, Pagès, J L, Perroud, Jean-Pierre, Rügger, D, Rusack, R W, Singh, V, Snow, G A, Sozzi, G, Studer, L, Tran, M T, Vacchi, A, and Valenti, G

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

Direct photon production cross sections obtained in high statistics $\bar{p}p$ and $pp$ collisions at $\sqrt{s}=24.3$ GeV at the CERN SPS are used in a next-to-leading order QCD analysis. From the ( stat.)~\pm0.0033\,(syst.)~^{+0.0077}_{-0.0034} \,(t cross section difference $\sigma(\bar{p}p~\to~\gamma X)~-~\sigma(pp~\to~\gamma X)$ and quark distributions measured in deep inelastic scattering, a determination of the strong coupling constant, $\alpha_s$, is performed via a measurement of \ms. This measurement yields a value \ms\ = $210 \pm 22 \,(stat.) \pm 44 \,(syst.) ^{+105}_{-36} \,(theo.)$ MeV. The corresponding value of $\alpha_s$ expressed at $M^2_Z$ is $\alpha_s(M^2_Z)=0.1112~\pm0.0016\

Published
1999

40. Precision Measurement of Scaled Momentum, Charge Multiplicity and Thrust in $\nu_{\mu}N$ and $\overline\nu_{\mu}N$ Interactions

Author

Altegoer, J, Angelini, C, Astier, Pierre, Autiero, D, Baldisseri, Alberto, Baldo-Ceolin, Massimilla, Ballocchi, G, Banner, M, Basa, S, Bassompierre, Gabriel, Benslama, K, Besson, N, Bird, I G, Blumenfeld, B, Bobisut, F, Bouchez, J, Boyd, S, Bueno, A G, Bunyatov, S A, Camilleri, L L, Cardini, A, Cattaneo, Paolo Walter, Cavasinni, V, Cervera-Villanueva, A, Collazuol, G, Conforto, G, Conta, C, Contalbrigo, M, Cousins, R D, Daniels, D C, Degaudenzi, H M, De Santo, A, Del Prete, T, Dignan, T, Di Lella, L, do Couto e Silva, E, Donnelly, I J, Dumarchez, J, Ellis, M, Fazio, T, Feldman, G J, Ferrari, R, Ferrère, D, Flaminio, Vincenzo, Fraternali, M, Gaillard, Jean-Marc, Galumian, P I, Gangler, E, Geiser, A, Geppert, D, Gibin, D, Gninenko, S N, Godley, A, Gómez-Cadenas, J J, Gosset, J, Gössling, C, Gouanère, M, Grant, A, Graziani, G, Guglielmi, A M, Hagner, C, Hernando, J, Hubbard, D B, Hurst, P, Hyett, N, Iacopini, E, Joseph, C L, Juget, F R, Kirsanov, M M, Klimov, O L, Kokkonen, J, Kovzelev, A, Krasnoperov, A V, Kuznetsov, V E, Lacaprara, S, Lanza, A, La Rotonda, L, Laveder, M, Lazzeroni, C, Letessier-Selvon, A A, Lévy, J M, Linssen, Lucie, Ljubicic, A, Long, J, Lupi, A, Manola-Poggioli, E, Marchionni, A, Martelli, F, Méchain, X, Mendiburu, J P, Meyer, J P, Mezzetto, Mauro, Mishra, S R, Mossuz, L, Moorhead, G F, Nédélec, P, Nefedov, Yu A, Nguyen-Mau, C, Nordmann, D, Orestano, D, Pastore, F, Peak, L S, Pennacchio, E, Perroud, Jean-Pierre, Pessard, H, Petti, R, Placci, Alfredo, Pluquet, A, Polesello, G, Pollmann, D, Popov, B A, Poulsen, C, Rathouit, P, Renzoni, G, Roda, C, Rubbia, André, Salvatore, F, Schahmaneche, K, Schmidt, B, Serrano, M, Sevior, M E, Sillou, D, Soler, F J P, Sozzi, G, Steele, D, Steininger, M, Stiegler, U, Stipcevic, M, Stolarczyk, T, Tareb-Reyes, M, Taylor, G N, Tereshchenko, S, Toropin, A N, Touchard, A M, Tovey, Stuart N, Tran, M T, Tsesmelis, E, Ulrichs, J, Urós, V, Vacavant, L, Valdata-Nappi, M, Valuev, V Yu, Vannucci, François, Varvell, K E, Veltri, M, Vercesi, V, Verkindt, D, Vieira, J M, Vinogradova, T G, Vo, M K, Volkov, S, Weber, F, Weisse, T, Werlen, M, Wilson, F F, Winton, L J, Yabsley, B D, Zaccone, Henri, Zuber, K, and Zuccon, P

Subjects
High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

We report the first precision measurements of the scaledmomentum, the charge multiplicity, and the thrust of hadronic jets inthe Breit frame in Deep Inelastic Scattering \nun\ and\nunbar\ charged current events over the $Q^2$ range from 1 to 100 \GeVsq\ . Theneutrino data, obtained in the NOMAD experiment at the CERN SPS, extend the $Q^2$-evolution ofthese parametersby two orders of magnitude, and with commensurate precision, whencompared to those reported by the \ep\ and \ee\ experiments.

Published
1998

41. A search for $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillations using the NOMAD detector

Author

Altegoer, J, Angelini, C, Astier, Pierre, Autiero, D, Baldisseri, Alberto, Baldo-Ceolin, Massimilla, Ballocchi, G, Banner, M, Basa, S, Bassompierre, Gabriel, Benslama, K, Besson, N, Bird, I G, Blumenfeld, B, Bobisut, F, Bouchez, J, Boyd, S, Bueno, A G, Bunyatov, S A, Camilleri, L L, Cardini, A, Castera, A, Cattaneo, Paolo Walter, Cavasinni, V, Cervera-Villanueva, A, Collazuol, G, Conforto, G, Conta, C, Contalbrigo, M, Cousins, R D, Daniels, D C, Degaudenzi, H M, Del Prete, T, De Santo, A, Dignan, T, Di Lella, L, do Couto e Silva, E, Donnelly, I J, Dumarchez, J, Fazio, T, Feldman, G J, Ferrari, R, Ferrère, D, Flaminio, Vincenzo, Fraternali, M, Fumagalli, G, Gaillard, Jean-Marc, Galumian, P I, Gangler, E, Geiser, A, Geppert, D, Gibin, D, Gninenko, S N, Gómez-Cadenas, J J, Gosset, J, Gössling, C, Gouanère, M, Grant, A, Graziani, G, Guglielmi, A M, Hagner, C, Hernando, J, Hubbard, D B, Hurst, P, Hyett, N, Iacopini, E, Joseph, C L, Juget, F R, Kekez, D, Khomenko, B A, Kirsanov, M M, Klimov, O L, Kokkonen, J, Kovzelev, A, Kuznetsov, V E, Lacaprara, S, Lanza, A, La Rotonda, L, Lazzeroni, C, Laveder, M, Letessier-Selvon, A A, Lévy, J M, Linssen, Lucie, Ljubicic, A, Long, J, Lupi, A, Manola-Poggioli, E, Marchionni, A, Martelli, F, Méchain, X, Mendiburu, J P, Meyer, J P, Mezzetto, Mauro, Mishra, S R, Moorhead, G F, Mossuz, L, Nédélec, P, Nefedov, Yu A, Nguyen-Mau, C, Orestano, D, Pastore, F, Peak, L S, Pennacchio, E, Perroud, Jean-Pierre, Pessard, H, Petti, R, Placci, Alfredo, Plothow-Besch, Hartmute, Pluquet, A, Polesello, G, Pollmann, D, Pope, B G, Popov, B A, Poulsen, C, Rathouit, P, Renzoni, G, Roda, C, Rubbia, André, Salvatore, F, Scannicchio, D A, Schahmaneche, K, Schmidt, B, Sconza, A, Serrano, M, Sevior, M E, Sillou, D, Soler, F J P, Sozzi, G, Steele, D, Steffen, P, Steininger, M, Stiegler, U, Stipcevic, M, Stolarczyk, T, Tareb-Reyes, M, Taylor, G N, Tereshchenko, V V, Toropin, A N, Touchard, A M, Tovey, Stuart N, Tran, M T, Tsesmelis, E, Ulrichs, J, Urós, V, Vacavant, L, Valdata-Nappi, M, Valuev, V Yu, Vannucci, François, Varvell, K E, Veltri, M, Vercesi, V, Verkindt, D, Vieira, J M, Vinogradova, T G, Vo, M K, Volkov, S, Weber, F V, Weisse, T, Werlen, M, Wilson, F F, Winton, L J, Yabsley, B D, Zaccone, Henri, and Zuber, K

Subjects
High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

NOMAD is a neutrino oscillation experiment designed to search for $\nu_\tau$ appearance in the CERN-SPS wide band $\nu_\mu$ beam. Signal detection relies on the identification of $\nu_\tau$ charge d current interactions using kinematic criteria. The analysis of the 1995 data sample yields no oscillation signal. Combining all studied $\tau$ decay modes, a limit of $\sin^22\theta_{\mu \tau}~< ~4.2\times10^{-3}$ is obtained for large $\Delta m^2$ at the 90\% confidence level.

Published
1998

44. Direct photon production in $\overline{p}p$ and $pp$ interactions at $\sqrt{s}$ = 24.3 GeV

Author

Sozzi, G, Ballocchi, G, Bernasconi, A, Breedon, R E, Camilleri, L L, Cool, R L, Cox, P T, Cushman, P B, Dick, Louis, Dukes, E C, Gabioud, Bernard, Gaille, F, Giacomelli, P, Hubbard, D B, Jeanneret, J B, Joseph, C L, Kubischta, Werner, Loude, J F, Malamud, E, Morel, Christian, Oberson, P, Overseth, O E, Pagès, J L, Perroud, Jean-Pierre, Rügger, D, Rusack, R W, Singh, V, Snow, G A, Steiner, D, Studer, L, Tran, M T, Vacchi, A, Valenti, G, and Werlen, M

Subjects
Particle Physics - Experiment
Published
1993

45. Determination of $\alpha_{s}$ and the gluon distribution using direct photon production in $\overline{p}p$ and $pp$ collisions

Author

Ballocchi, G, Bernasconi, A, Breedon, R E, Camilleri, L L, Cool, R L, Cox, P T, Cushman, P B, Dick, Louis, Dukes, E C, Gabioud, Bernard, Gaille, F, Giacomelli, P, Hubbard, D B, Jeanneret, J B, Joseph, C L, Kubischta, Werner, Loude, J F, Malamud, E, Morel, Christian, Oberson, P, Overseth, O E, Pagès, J L, Perroud, Jean-Pierre, Rügger, D, Rusack, R W, Singh, V, Snow, G A, Steiner, D, Studer, L, Tran, M T, Vacchi, A, Valenti, G, and Werlen, M

Subjects
Particle Physics - Experiment
Published
1993

46. P865: Revised letter of intent for a high - sensitivity study of charm and beauty decays

Author

Isenhower, L D, Sadler, M E, Chrisman, D, Cline, D, Park, J, Rhoades, J, Díaz-Cruz, J L, Pérez, M, Toscano, J, Atac, M, Brown, C N, Cooper, W E, Lederman, Leon Max, Crawley, H B, Firestone, A, Lamsa, J, Meyer, W T, Rosenberg, E I, Kaplan, D M, Childers, R C, Darden, C W, Wilson, J R, Chaney, R C, Fenyves, E J, Friedrich, J R, Hammack, H, Orgeron, J, Charpak, Georges, Giomataris, Ioanis, Joseph, C L, Morel, Christian, Perroud, Jean-Pierre, Tran, M T, Chipaux, Rémi, Derré, J, Kochowski, Claude, Lemoigne, Y, Loucatos, Sotirios S, and Rebourgeard, P C

Subjects
XX
Published
1993

47. RD30 status report: study of an optical trigger to be used for beauty search in fixed target mode at the LHC

Author

Charpak, Georges, Giomataris, Ioanis, Joseph, C L, Perroud, Jean-Pierre, Tran, M T, Chipaux, Rémi, Delbart, A, Derré, J, Kochowski, Claude, Lemoigne, Y, Loucatos, Sotirios S, Rebourgeard, P C, Kaplan, D M, Hill, T, Rosemberg, E I, Chrisman, D, Cline, D, Rhoades, J, Atac, Muzaffer, Buzuloiu, V, Vlad, O G, and Coltuc, D

Subjects
Detectors and Experimental Techniques
Published
1993

48. IMAPS - A high-resolution, echelle spectrograph to record far-ultraviolet spectra of stars from sounding rockets

Author

Jenkins, E. B, Joseph, C. L, Long, D, Zucchino, P. M, and Carruthers, G. R

Subjects
Spacecraft Instrumentation
Abstract

A novel sounding rocket payload consisting of a slitless objective grating spectrograph with no transmission elements in the optical train (or detector) is described. This instrument, called the interstellar medium absorption profile spectrograph (IMAPS), is designed to provide continuous coverage over the wavelength range of 950-1150 A; it has an effective collecting area of about 4 sq cm and can record spectra of pointlike sources at a wavelength resolution of 0.004 A and with a sample interval of 0.002 A. The successful use of this instrument aboard a Black Brant rocket is described.

Published
1988

49. Depletions and extinction curves for lines of sight through the outer edges of truly dense molecular clouds

Author

Joseph, C. L

Subjects
Astrophysics
Abstract

Observations of a few moderately reddened (0.3 is less than E(B-V) is less than 0.6) lines of sight through the outer edges of truly dense molecular clouds, not only show the overall depletions in these clouds to be as much as 0.5 (dex) greater than in comparably reddened diffuse clouds, but reveal a possible tendency for certain species to deplete preferentially. Possible methods of depletions are discussed.

Published
1986

50. Observations of neutral atoms in the Rho Ophiuchi cloud

Author

Snow, T. P, Joseph, C. L, and Meyer, D. M

Subjects
Astrophysics
Abstract

New observations of lines from neutral atoms in the lines of sight to three stars in the Rho Oph cloud are combined with literature data to look for evidence of density-enhanced regions with higher elemental depletions than those characterizing the cloud as a whole. The depletions inferred from neutral species, however, are comparable to those measured directly from observations of ions, suggesting that no strong density enhancements exist in the observed lines of sight. This conclusion is supported by electron densities derived from the observed ionization fractions, which also show no evidence for a strong variation of density with depth in the cloud. It appears that the overall density (and overall level of depletion) in the cloud is higher than in typical diffuse clouds, despite the apparent lack of strong condensations with enhanced relative depletions.

Published
1986
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