scholarly journals Optical Variability Monitoring for Gamma ray Blazars: preliminary results

2009 ◽  
Author(s):  
Jorge Ariel Combi ◽  
Ileana Andruchow ◽  
Sergio Aldo Cellone ◽  
Gustavo E. Romero ◽  
Josep Martí ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Optical Variability ◽  
Preliminary Results

CCD Photometry and Optical Variability of Gamma-Ray-loud BL Lacertae Object OJ 287 in a Low, Fainter State

2007 ◽  
Vol 133 (5) ◽  
pp. 1995-2000 ◽  
Author(s):  
X. Zhang ◽  
G. Zhao ◽  
Y. G. Zheng ◽  
L. Ma ◽  
Z. H. Xie ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Optical Variability ◽  
Ccd Photometry ◽  
Bl Lacertae

Observations of the galactic center with the GSFC Low-Energy Gamma-Ray Spectrometer: Preliminary results

1982 ◽  
Author(s):  
W. S. Paciesas ◽  
T. L. Cline ◽  
B. J. Teegarden ◽  
J. Tueller ◽  
P. Durouchoux ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Galactic Center ◽  
Low Energy ◽  
Preliminary Results ◽  
Gamma Ray Spectrometer ◽  
Energy Gamma

FIRST RESULTS WITH THE RISING ACTIVE STOPPER

2008 ◽  
Vol 17 (supp01) ◽  
pp. 8-20 ◽  
Author(s):  
P. H. REGAN ◽  
N. ALKHOMASHI ◽  
N. AL-DAHAN ◽  
Zs. PODOLYÁK ◽  
S. B. PIETRI ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Spectroscopic Studies ◽  
Ground State Structure ◽  
Energy Response ◽  
Axially Symmetric ◽  
Beta Particles ◽  
Preliminary Results ◽  
Hartree Fock ◽  
First Results ◽  
Beta Delayed

This paper outlines some of the physics opportunities available with the GSI RISING active stopper and presents preliminary results from an experiment aimed at performing beta-delayed gamma-ray spectroscopic studies in heavy-neutron-rich nuclei produced following the projectile fragmentation of a 1 GeV per nucleon 208 Pb primary beam. The energy response of the silicon active stopping detector for both heavy secondary fragments and beta-particles is demonstrated and preliminary results on the decays of neutron-rich Tantalum ( Ta ) to Tungsten ( W ) isotopes are presented as examples of the potential of this technique to allow new structural studies in hitherto experimentally unreachable heavy, neutron-rich nuclei. The resulting spectral information inferred from excited states in the tungsten daughter nuclei are compared with results from axially symmetric Hartree–Fock calculations of the nuclear shape and suggest a change in ground state structure for the N = 116 isotone 190 W compared to the lighter isotopes of this element.

scholarly journals Preliminary results from the 1999 balloon flight of the Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT)

2000 ◽  
Author(s):  
Elena Aprile ◽  
Uwe G. Oberlack ◽  
Alessandro Curioni ◽  
Valeri Egorov ◽  
Karl-Ludwig Giboni ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Liquid Xenon ◽  
Balloon Flight ◽  
Preliminary Results ◽  
Imaging Telescope ◽  
Gamma Ray Imaging

Rapid optical variability of the gamma-ray burst grb 080319b and its central engine

2010 ◽  
Vol 65 (3) ◽  
pp. 223-229
Author(s):  
G. Beskin ◽  
S. Karpov ◽  
S. Bondar ◽  
A. Guarnieri ◽  
C. Bartolini ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Optical Variability ◽  
Gamma Ray Burst ◽  
Central Engine

The Experimental Study of Lanthanum Bromide Detector in the Gamma Ray Imaging

2013 ◽  
Vol 336-338 ◽  
pp. 373-378
Author(s):  
Cui Lan Zhao ◽  
Yong Ping Li ◽  
Li Hong Chen ◽  
Chao Yuan ◽  
Yu Jin Qi
Keyword(s):  
Gamma Ray ◽  
High Sensitivity ◽  
Effective Field ◽  
Detector Module ◽  
Preliminary Results ◽  
Lanthanum Bromide ◽  
Imaging Detector ◽  
Gamma Ray Imaging ◽  
Position Sensitive Photomultiplier Tube ◽  
Scintillator Crystal

Cerium activated lanthanum bromide (LaBr3:Ce3+) scintillator crystal has shown very promising characteristics for high-resolution and high-sensitivity gamma ray imaging and spectrometric applications [1,2,. In this paper, we present some preliminary results of a compact gamma camera based on LaBr3:Ce3+ crystal. The detector module consists of a continuous LaBr3:Ce3+ crystal with a sensitive area of 50x50 mm2 and 5mm thickness coupling to a Hamamatsu H8500 position-sensitive photomultiplier tube (PSPMT). A compact multiplexed readout based on symmetric charge division circuit (SCD) was developed to reduce the 64 anode signal to 16 readout channels, and a resistive division network to reduce the readout channels from 16 to 4. The performance of the imaging detector module was tested using a 57Co source. The preliminary results showed that this detector module can achieve an effective field-of-view (FOV) of ~39x39 mm2 with a good intrinsic spatial resolution around 1.5mm and energy resolution of 9.2% at 122 keV.

scholarly journals AI gamma-ray burst classification: Methodology/preliminary results

1998 ◽  
Author(s):  
Jon Hakkila ◽  
David J. Haglin ◽  
Richard J. Roiger ◽  
Robert S. Mallozzi ◽  
Geoffrey N. Pendleton ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Preliminary Results

ON THE PRODUCTION OF HIGH-ENERGY NEUTRINOS IN GAMMA-RAY BURSTS

2014 ◽  
Vol 28 ◽  
pp. 1460207
Author(s):  
MATIAS M. REYNOSO
Keyword(s):  
Energy Loss ◽  
Gamma Ray ◽  
Neutrino Flux ◽  
High Energy ◽  
Gamma Ray Bursts ◽  
Proton Proton ◽  
Preliminary Results ◽  
Acceleration Zone ◽  
High Energy Neutrinos

We present preliminary results of a model with two zones in order to study the production of high energy neutrinos at the prompt phase of gamma-ray bursts (GRB). We consider an acceleration zone, where protons and electrons are injected and accelerated, being subject to synchrotron, proton-proton, and proton-gamma cooling. We also assume that they can escape from this zone at a certain rate. The produced pions and the decaying muons are also subject to energy loss and gain processes within the acceleration zone, and the escaping ones are re-injected in a second zone where acceleration no longer operates. We compute the neutrino output expected from both of these zones using typical GRB parameters, and integrate in the redshift to obtain a diffuse neutrino flux which can be different from the expected within one-zone models.

Lunar Surface Radioactivity: Preliminary Results of the Apollo 15 and Apollo 16 Gamma-Ray Spectrometer Experiments

Science ◽  
1973 ◽  
Vol 179 (4075) ◽  
pp. 800-803 ◽  
Author(s):  
A. E. Metzger ◽  
J. I. Trombka ◽  
L. E. Peterson ◽  
R. C. Reedy ◽  
J. R. Arnold
Keyword(s):  
Lunar Surface ◽  
Gamma Ray ◽  
Preliminary Results ◽  
Gamma Ray Spectrometer
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