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Improvements in the energy resolution and high-count-rate performance of bismuth germanate

Description: Several methods for improving the energy resolution of bismuth germanate (BGO) have been investigated. It is shown that some of these methods resulted in a substantial improvement in the energy resolution. In addition, a method to improve the performance of BGO at high counting rates has been systematically studied. The results of this study are presented and discussed.
Date: January 1, 1985
Creator: Koehler, P.E.; Wender, S.A. & Kapustinsky, J.S.
Partner: UNT Libraries Government Documents Department

Multichip module technology development

Description: This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). A Multichip Module (MCM) was designed and submitted for fabrication to the Lockheed Martin foundry using a licensed process called High Density Interconnect (HDI). The HDI process uses thin film techniques to create circuit interconnect patterns on multiple layers of dielectric film which are deposited directly on top of unpackaged electronic die. This results in an optimally small package that approaches the area of the bare die themselves. This project tested the capability of the Lockheed Martin foundry to produce, in an HDI process, a complex mixed-mode (analog and digital) circuit on a single MCM substrate.
Date: October 1, 1997
Creator: Kapustinsky, J.S.; Boissevain, J.G.; Muck, R.C.; Smith, G.D.; Wong-Swanson, B.G. & Ziock, H.J.
Partner: UNT Libraries Government Documents Department

A New Approach to Measuring the Neutron Decay Correlations with Cold Neutrons at LANSCE

Description: Precision measurements of the neutron beta-decay correlations A, B, a, and b provide important tests of the standard model of electroweak interactions: a test of the unitarity of the first row of the CKM matrix, a search for new weak interactions, a test of the theory of nuclear beta decays, and a test of the conserved-vector-current hypothesis. The authors are designing an experiment at the LANSCE short-pulse spallation source to measure all four correlations to an order of magnitude better accuracy than the existing measurements. The accuracy of the previous measurements was limited by systematics. The design of the proposed experiment makes use of the pulsed nature of the LANSCE source to reduce systematic errors associated with the measurement of the neutron polarization as well as other systematic errors. In addition, the authors are developing silicon strip detectors for detecting both the proton and electron from the neutron decay.
Date: June 8, 1999
Creator: Wilburn, W.S.; Bowman, J.D.; Greene, G.L.; Jones, G.L.; Kapustinsky, J.S. & Penttila, S.I.
Partner: UNT Libraries Government Documents Department

The vertex detector for the Lepton/Photon Collaboration

Description: The conceptual design of the vertex detector for the Lepton/Photon Collaboration at RHIC is described, including simulations of its expected performance. The design consists of two concentric layers of single-sided Si strips. The expected performance as a multiplicity detector and in measuring the pseudo-rapidity {eta} distribution is discussed as well as the expected vertex finding efficiency and accuracy. Various options which could be used to reduce the cost of the detector are also discussed.
Date: January 1, 1991
Creator: Sullivan, J.P.; Boissevain, J.G.; Fox, D.; van Hecke, H.; Jacak, B.V.; Kapustinsky, J.S. et al.
Partner: UNT Libraries Government Documents Department

PS187 - a good statistics study of antiproton interactions with nuclei: preliminary results

Description: The goals of LEAR experiment PS187 are reviewed. The current status of the experiment is discussed, and final data on a search for anti p-nucleus bound states formed by the reactions /sup 28/Si(anti p,p) and /sup 28/Si(anti p,d) are presented.
Date: January 1, 1984
Creator: Sunier, J.W.; Bol, K.D.; Clover, M.R.; DeVries, R.M.; DiGiacomo, N.J.; Kapustinsky, J.S. et al.
Partner: UNT Libraries Government Documents Department

Antiproton annihilations in nuclei

Description: Recent results from LEAR experiment PS187 are presented. Preliminary data for the inclusive production of ..pi../sup +/, K/sup +/, and p from the annihilation of 180 MeV antiprotpns in /sup 28/Si and /sup 238/U are compared with predictions of intranuclear cascade calculations. Proton and pion production data are well reproduced by the calculations, but kaon yields at low momenta appear to be strongly suppressed in the experimental data. 8 refs., 5 figs.
Date: January 1, 1985
Creator: McGaughey, P.L.; Bol, K.D.; Clover, M.R.; DeVries, R.M.; DiGiacomo, N.J.; Kapustinsky, J.S. et al.
Partner: UNT Libraries Government Documents Department

The vertex detector for the Lepton/Photon Collaboration

Description: The conceptual design of the vertex detector for the Lepton/Photon Collaboration at RHIC is described, including simulations of its expected performance. The design consists of two concentric layers of single-sided Si strips. The expected performance as a multiplicity detector and in measuring the pseudo-rapidity {eta} distribution is discussed as well as the expected vertex finding efficiency and accuracy. Various options which could be used to reduce the cost of the detector are also discussed.
Date: December 31, 1991
Creator: Sullivan, J. P.; Boissevain, J. G.; Fox, D.; van Hecke, H.; Jacak, B. V.; Kapustinsky, J. S. et al.
Partner: UNT Libraries Government Documents Department

Operation of silicon microstrip detectors in a high radiation environment

Description: A Silicon Microstrip Spectrometer was recently installed and operated in an 800 GeV proton beamline at Fermilab as a major new component of experiment E789. The detectors received an estimated radiation exposure of up to 7.8 {times} 10{sup 12} minimum ionizing particles per cm{sup 2} over a period of two months. We report on the changes in detector performance that we have observed following preliminary data analysis. 5 refs., 4 figs.
Date: January 1, 1990
Creator: Kapustinsky, J.S.; Alde, D.M.; Boissevain, J.G.; Jeppesen, R.G.; Lane, D.W.; Leitch, M.J. et al.
Partner: UNT Libraries Government Documents Department

Preliminary results from Fermilab E789

Description: Fermilab experiment 789 studies low-multiplicity decays of neutral D and B mesons in a high-rate fixed-target environment. Preliminary results from the 1991 run are presented.
Date: January 1, 1992
Creator: Peng, J.C.; Boissevain, J.; Carey, T.A.; Jansen, D.M.; Jeppesen, R.; Kapustinsky, J.S. et al.
Partner: UNT Libraries Government Documents Department

Beauty and charm production from Fermilab experiment 789

Description: Experiment 789 is a fixed-target experiment at Fermilab designed to study low-multiplicity decays of charm and beauty. During the 1991 run. E789 collected {approx} 10{sup 9} events using an 800 GeV proton beam incident upon gold and beryllium targets. Analyses of these data include searches for b {yields} J/{psi}+{Chi} decays and {Alpha}- dependence measurements of neutral D meson production. Preliminary results from the 1991 run are presented in this paper.
Date: June 1, 1993
Creator: Jansen, D.M.; Boissevain, J.; Carey, T.A.; Jeppesen, R.G.; Kapustinsky, J.S.; Lane, D.W. et al.
Partner: UNT Libraries Government Documents Department

Preliminary results from Fermilab E789

Description: Fermilab experiment 789 studies low-multiplicity decays of neutral D and B mesons in a high-rate fixed-target environment. Preliminary results from the 1991 run are presented.
Date: December 1, 1992
Creator: Peng, J. C.; Boissevain, J.; Carey, T. A.; Jansen, D. M.; Jeppesen, R.; Kapustinsky, J. S. et al.
Partner: UNT Libraries Government Documents Department

The design and construction of a double-sided Silicon Microvertex Detector for the L3 experiment at CERN

Description: A Silicon Microvertex Detector (SMD) has been commissioned for the L3 experiment at the Large Electron-Positron colliding-beam accelerator (LEP) at the European Center for Nuclear Physics, (CERN). The SMD is a 72,672 channel, two layer barrel tracker that is comprised of 96 ac-coupled, double-sided silicon detectors. Details of the design and construction are presented.
Date: December 1, 1993
Creator: Adam, A.; Ahlen, S.; Marin, A.; Zhou, B.; Ambrosi, G.; Babucci, E. et al.
Partner: UNT Libraries Government Documents Department