Publications

1998
Kuiper L, Hermsen W, Bennett K, Carraminana A, Lyne A, McConnell M, Schonfelder V. Detection of pulsed MeV emission from PSR B1951+32 by COMPTEL. ASTRONOMY & ASTROPHYSICS [Internet]. 1998;337 :421–432. Publisher's Version
McConnell ML, Forrest DJ, Macri J, McClish M, Osgood M, Ryan JM, Vestrand WT, Zanes C. Development of a hard X-ray polarimeter for solar flares and gamma-ray bursts. IEEE TRANSACTIONS ON NUCLEAR SCIENCE [Internet]. 1998;45 :910–914. Publisher's Version
Kippen RM, Ryan JM, Connors A, Hartmann DH, Winkler C, Kuiper L, Varendorff M, McConnell ML, Hurley K, Hermsen W, et al. The locations of gamma-ray bursts measured by COMPTEL. ASTROPHYSICAL JOURNAL [Internet]. 1998;492 :246–262. Publisher's Version
Tousignant O, Hamel LA, Courville JF, Macri JR, Mayer M, McConnell ML, Ryan JM. Transport properties and performance of CdZnTe strip detectors. IEEE TRANSACTIONS ON NUCLEAR SCIENCE [Internet]. 1998;45 :413–416. Publisher's Version
1997
Much R, Bennett K, Winkler C, Diehl R, Lichti G, Schönfelder V, Steinle H, Strong A, Varendorff M, Hermsen W, et al. 5 years of Crab Pulsar observations with COMPTEL, in Proceedings of the Fourth Compton Symposium. Vol 410. ; 1997 :542–546.
Larson K, Boykin V, Cherry ML, Courville JF, Doty FP, Drake A, Guzik TG, Hamel LA, Macri JR, Mayer M, et al. CdZnTe strip detectors as sub-millimeter resolution imaging gamma radiation spectrometers, in Proceedings of the IEEE 23rd Northeast Bioengineering Conference, 1997. ; 1997. Publisher's VersionAbstract
We report γ-ray detection performance measurements and computer simulations of a sub-millimeter pitch CdZnTe strip detector. The detector is a prototype for γ-ray measurements in the range of 20-600 keV. The prototype is a 1.5 mm thick, 64×64 orthogonal stripe CdZnTe detector of 0.375 mm pitch in both dimensions, with approximately one square inch of sensitive area. Using discrete laboratory electronics to process signals from an 8×8 stripe region of the prototype we measured good spectroscopic uniformity and sub-pitch ( 0.2 mm) spatial resolution in both x and y dimensions. We present below measurements of the spatial uniformity, relative timing and pulse height of the anode and cathode signals. We simulated the photon interactions and signal generation in the strip detector and the test electronics and we compare these results with the data. The data indicate that cathode signal-as well as the anode signal-arises more strongly from the conduction electrons rather than the holes.
McConnell M, Fletcher S, Bennett K, Bloemen H, Diehl R, Hermsen W, Ryan J, Schönfelder V, Strong A, van Dijk R. COMPTEL all-sky imaging at 2.2 MeV, in Proceedings of the Fourth Compton Symposium. Vol 410. ; 1997 :1099–1103.
van Dijk R, Bennett K, Winkler C, Bloemen H, Hermsen W, Diehl R, Schöfelder V, McConnell M, Ryan J. COMPTEL Observations of GRO J1655-40, in The Transparent Universe. Vol 382. ; 1997 :225–225.
McConnell ML, Forrest DJ, Macri J, McClish M, Osgood M, Ryan JM, Vestrand WT, Zanes C. Development of a hard X-ray polarimeter for solar flares and gamma-ray bursts., in 1997 IEEE Nuclear Science Symposium, Vol. 1, p. 587 - 591. Vol 1. ; 1997 :587–591.
Strong AW, Diehl R, Schönfelder V, Bennett K, McConnell M, Ryan J. Diffuse Galactic continuum emission: Recent studies using COMPTEL data, in Proceedings of the Fourth Compton Symposium. Vol 410. ; 1997 :1198–1202.
Ryan J, Macri JR, McConnell ML, Wunderer CB, Holslin D, Polichar AR, Baltgalvis J. A prototype for SONTRAC, a scintillating plastic fiber tracking detector for neutron imaging and spectroscopy, in Nuclear Science Symposium Conference Record, 1997. IEEE. ; 1997. Publisher's VersionAbstract
We report on tests of a prototype detector system designed to perform imaging and spectroscopy on 20 to 250 MeV neutrons. Although developed for the study of high-energy solar flare processes, the detection techniques employed for SONTRAC, the SOlar Neutron TRACking experiment, can be applied to measurements in a variety of disciplines including atmospheric physics, radiation therapy and nuclear materials monitoring. The SONTRAC instrument measures the energy and direction ofneutrons by detecting double neutron-proton scatters and recording images of the ionization tracks of the recoil protons in a densely packed bundle of scintillating plastic fibers stacked in orthogonal layers. By tracking the recoil protons from individual neutrons, the kinematics of the scatter are determined. This directional information results in a high signal to noise measurement. SONTRAC is also capable of detecting and measuring high-energy gamma rays \textgreater20 MeV as a “solid-state spark chamber”. The self-triggering and track imaging features of a prototype for tracking in two dimensions are demonstrated in calibrations with cosmic-ray muons, 14 to 65 MeV neutrons and 20 MeV protons.
van Dijk R, Bennett K, Bloemen H, Diehl R, Hermsen W, McConnell M, Ryan J, Schönfelder V. A search for gamma-ray flares from black-hole candidates on time scales of 1.5 hours, in Proceedings of the Fourth Compton Symposium. Vol 410. ; 1997 :967–971.
Varendorff M, Oberlack U, Weidenspointner G, Diehl R, van Dijk R, McConnell M, Ryan J. A time dependent model for the activation of COMPTEL, in Proceedings of the Fourth Compton Symposium. Vol 410. ; 1997 :1577–1581.
Zych A, Bhattacharya D, Dixon D, O Neill T, Tümer T, White RS, Ryan J, McConnell M, Macri J, Ögelman H, et al. Few Arc-Minute and keV Resolutions with the TIGRE Compton Telescope, in The Transparent Universe. Vol 382. ; 1997 :367–367.
Collmar W, Wessolowski U, Schönfelder V, Weidenspointner G, Kappadath C, McConnell M, Bennett K. Improved COMPTEL 10-30 MeV event selections for point sources from inflight data, in Proceedings of the Fourth Compton Symposium. Vol 410. ; 1997 :1587–1591.
McConnell M, Bennett K, Bloemen H, Collmar W, Hermsen W, Kuiper L, Much R, Ryan J, Schönfelder V, Steinle H, et al. The MeV spectrum of Cygnus X-1 as observed with COMPTEL, in Proceedings of the Fourth Compton Symposium. Vol 410. ; 1997 :829–833.
Hermsen W, Kuiper L, Schönfelder V, Strong AW, Bennett K, Much R, McConnell M, Ryan J, Carraminana A. New COMPTEL Results on Pulsar Studies at MeV Energies, in The Transparent Universe. Vol 382. ; 1997 :287–287.
Tousignant O, Hamel L-A, Courville J-F, Paki P, Macri JR, Larson K, Mayer M, McConnell ML, Ryan JM. Progress in the study of CdZnTe strip detectors, in Hard X-Ray and Gamma-Ray Detector Physics, Optics, and Applications. Vol 3115. ; 1997 :214–224.
Ryan JM, Baltgalvis J, Holslin DT, Macri JR, McConnell ML, Polichar AR, Wunderer CB. Prototype for SONTRAC: a scintillating plastic fiber detector for solar neutron spectroscopy, in EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy VIII. Vol 3114. ; 1997 :514–525.
Morris DJ, Bennett K, Bloemen H, Diehl R, Hermsen W, Lichti GG, McConnell ML, Ryan JM, Schönfelder V. Reassessment of the \$^56\$Co emission from SN 1991T, in Proceedings of the Fourth Compton Symposium. Vol 410. ; 1997 :1084–1088.

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