Publications

2006
Bloser P, McConnell ML, Macri JR, Ryan J, Baker J. Position Resolution in LaBr3 and LaCl3 Scintillators Using Position-Sensitive Photomultiplier Tubes, in Nuclear Science Symposium Conference record, 2006. IEEE. ; 2006. Publisher's VersionAbstract
Advanced scintillator materials such as LaBr3:Ce and LaCl3:Ce hold great promise for future hard X-ray and gamma-ray astrophysics missions due to their high density, high light output, good linearity, and fast decay times. Of particular importance for future space-based imaging instruments, such as coded-aperture telescopes, is the precise spatial location of individual gamma-ray interactions. We have investigated the position and energy resolution achievable within monolithic (5 cm × 5 cm × 1 cm) LaBr3:Ce and LaCl3:Ce crystals using position-sensitive light readout devices, including a position-sensitive photomultiplier tube and a multi-anode photomultiplier tube. We present the results of these tests and discuss the applicability of such advanced scintillators to future high-energy imaging astrophysics missions.
McConnell ML, Bloser PF, Legere J, Macri JR, Narita T, Ryan JM. Prospects for GRB Polarimetry with GRAPE, in Gamma-Ray Bursts in the Swift Era. Vol 836. ; 2006 :654–659.
Bloser P, McConnell ML, Macri JR, Bruillard PJ, Ryan J, Hajdas W. Radiation Damage and Activation from Proton Irradiation of Advanced Scintillators, in Nuclear Science Symposium Conference record, 2006. IEEE. ; 2006. Publisher's VersionAbstract
We present results from a proton accelerator beam test to measure radiation damage and activation in advanced scintillator materials. Samples of LaBr3:Ce and LaCl3:Ce were exposed to protons from 40-250 MeV at the Proton Irradiation Facility of the Paul Scherrer Institute in Switzerland. Twelve energy bands were used to simulate the spectrum of the South Atlantic Anomaly (SAA), with different samples exposed to the equivalent of 4 months, 1 year, and 5 years of SAA passage. No significant decrease in light output was found due to radiation damage, indicating that these new scintillator materials are radiation tolerant. High-resolution spectra of the samples were obtained before and after irradiation with a Germanium spectrometer to study activation. We present a detailed analysis of these spectra and a discussion of the suitability of these scintillator materials for detectors in future space missions.
Bloser P, McConnell ML, Ryan J, Barbier LM, Centa A, Hunter SD, Krizmanic JF, Link JT, DeNolfo GA, Son S. Simulated Performance of 3-DTI Gamma-Ray Telescope Concepts, in Nuclear Science Symposium Conference record, 2006. IEEE. ; 2006. Publisher's VersionAbstract
We present Monte Carlo simulations of two astronomical gamma-ray telescope concepts based on the ThreeDimensional Track Imager (3- DTI) detector. The 3-DTI consists of a time projection chamber with two-dimensional, crossedstrip micro-well detector readout. The full three- dimensional reconstruction of charged-particle tracks in the gas volume is obtained from transient digitizers, which record the time signature of the charge collected in the wells of each strip. Such detectors hold great promise for advanced Compton telescope (ACT) and advanced pair telescope (APT) concepts due to the very precise measurement of charged particle momenta that is possible (Compton recoil electrons and electron-positron pairs, respectively). We have investigated the performance of baseline ACT and APT designs based on the 3-DTI detector using simulation tools based on GEANT3 and GEANT4, respectively. We present the expected imaging, spectroscopy, polarimetry, and background performance of each design.
Donmez B, Ryan J, Macri J, McConnell M, Narita T, Hamel L-A. Single-Sided Charge-Sharing CZT Strip Detectors for Gamma Ray Astronomy, in APS April Meeting Abstracts. ; 2006.
Kippen RM, Tournear D, Hoover A, Klimenko A, Wunderer CB, Zoglauer A, Boggs SE, Oberlack U, Sturner S, Weidenspointner G, et al. ACTtools - Space Environment Tools for Simulating Gamma-ray Instrument Backgrounds, in AAS/High Energy Astrophysics Division #9. Vol 38. ; 2006 :392–392.
Cherry M, Bloser PF, Budden BS, Case GL, Cravens JP, Guzik TG, Hurley KC, Kippen RM, Macri JR, McConnell ML, et al. CASTER - A Scintillator-Based Black Hole Finder Probe Based on Lanthanum Halide Scintillator, in AAS/High Energy Astrophysics Division #9. Vol 38. ; 2006 :385–385.
Bloser PF, Budden BS, Case GL, Cherry ML, Macri JR, McConnell ML, Ryan JM. Development of Lanthanum Bromide and Lanthanum Chloride Scintillator Detectors for Hard X-ray Astronomy, in AAS/High Energy Astrophysics Division #9. Vol 38. ; 2006 :385–385.
Wunderer CB, Kippen RM, Bloser PF, Boggs SE, Hoover A, McConnell ML, Novikova E, Oberlack U, Sturner S, Tournear D, et al. End-to-End Performance Predictions for Gamma-Ray Observatories - the ACT Approach and Methods, in AAS/High Energy Astrophysics Division #9. Vol 38. ; 2006 :391–391.
Bloser PF, McConnell ML, Legere JS, Macri JR, Ryan JM, Narita T. GRAPE: A Balloon-Borne Hard X-ray Polarimeter for Solar Flares, in AAS/Solar Physics Division Meeting #37. Vol 38. ; 2006 :226–226.
McConnell ML, Bloser PF, Legere JS, Macri JR, Ryan JM. Status of the Gamma Ray Polarimeter Experiment (GRAPE), in AAS/High Energy Astrophysics Division #9. Vol 38. ; 2006 :386–386.
Wunderer CB, Kippen RM, Bloser PF, Boggs SE, McConnell ML, Harris M, Hoover A, Klimenko AV, Novikova EI, Oberlack U, et al. The ACT vision mission study simulation effort. NEW ASTRONOMY REVIEWS [Internet]. 2006;50 :608–612. Publisher's Version
McConnell ML, Bloser PF, Case GL, Cherry ML, Cravens J, Guzik TG, Hurley K, Kippen RM, Macri JR, Miller RS, et al. The CASTER black hole finder probe. NEW ASTRONOMY REVIEWS [Internet]. 2006;50 :633–636. Publisher's Version
Bloser PF, Legere JS, Macri JR, McConnell ML, Narita T, Ryan JM. GRAPE - A balloon-borne Gamma-Ray Polarimeter Experiment. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS [Internet]. 2006;6 :393–397. Publisher's Version
Bloser PF, Ryan JM, McConnell ML, Macri JR, Bravar U, Kanbach G, Andritschke R, Ajello M, Zoglauer A, Hunter SD, et al. The MEGA project for Medium Energy Gamma-ray Astronomy. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS [Internet]. 2006;6 :388–392. Publisher's Version
Bloser PF, Ryan JM, McConnell ML, Macri JR, Andritschke R, Kanbach G, Zoglauer A. The MEGA project: Science goals and hardware development. NEW ASTRONOMY REVIEWS [Internet]. 2006;50 :619–623. Publisher's Version
McConnell ML, Bloser PF. Status and future prospects for gamma-ray polarimetry. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS [Internet]. 2006;6 :237–246. Publisher's Version
Bravar U, Bruillard PJ, Flueckiger EO, Macri JR, McConnell ML, Moser MR, Ryan JM, Woolf RS. Design and testing of a position-sensitive plastic scintillator detector for fast neutron imaging. IEEE TRANSACTIONS ON NUCLEAR SCIENCE [Internet]. 2006;53 :3894–3903. Publisher's Version
Bravar U, Bruillard PJ, Flueckiger EO, Macri JR, McConnell ML, Moser MR, Ryan JM, Woolf RS. Design and testing of a position-sensitive plastic scintillator detector for fast neutron imaging. IEEE TRANSACTIONS ON NUCLEAR SCIENCE [Internet]. 2006;53 :3894–3903. Publisher's Version
2005
Bravar U, Fluckiger EO, Godin K, Hansen ZC, Macri JR, McConnell ML, Miller RS, Moser MR, Ryan J. Atmospheric neutron measurements with the SONTRAC science model, in Nuclear Science Symposium Conference Record, 2005 IEEE. ; 2005. Publisher's VersionAbstract
–The SOlar Neutron TRACking (SONTRAC) telescope was originally developed to measure the energy spectrum and incident direction of neutrons produced in solar flares, in the energy range 20 - 250 MeV. While developed primarily for solar physics, the SONTRAC detector may be employed in virtually any application requiring both energy measurement and imaging capabilities. The SONTRAC Science Model (SM) is presently being operated at the University of New Hampshire (UNH) as a ground-based instrument to investigate the energy spectrum, zenith and azimuth angle dependence of the cosmic-ray induced sea-level atmospheric neutron flux. SONTRAC measurements are based on the non-relativistic double scatter of neutrons off ambient protons within a block of scintillating fibers. Using the n-p elastic double-scatter technique, it is possible to uniquely determine the neutron’s energy and direction on an event-by-event basis. The 3D SM consists of a cube of orthogonal plastic scintillating fiber layers with 5 cm sides, read out by two CCD cameras. Two orthogonal imaging chains allow full 3D reconstruction of scattered proton tracks.

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