Gamma-ray Output Spectra from239Pu Fission

Complex Gamma Ray Spectra Analysis

The gamma ray spectrometry laboratory of the University of Bucharest was designed for the analysis of low-level radioactivity samples. High efficiency shielded HPGe detectors are used. Efficiency calibration is achieved by complementing experimental calibration with Monte Carlo computation carried out using GESPECOR, also applied for the evaluation of coincidence summing corrections. Low detect...

The spectra of short Gamma–Ray Bursts

We present the results of the spectral analysis of a sample of short bright γ–ray bursts (GRB) detected by BATSE and compare them with the average and time resolved spectral properties of long bright bursts. While the spectral parameters of short GRBs confirm, as expected from previous works based on the hardness ratio, that they are harder than long events, we find that this difference is main...

Simulation of Neutron and Gamma Ray Emission from Fission

Implications of Cosmological Gamma-Ray Absorption II. Modification of gamma-ray spectra

Bearing on the model for the time-dependent metagalactic radiation field developed in the first paper of this series, we compute the gamma-ray attenuation due to pair production in photon-photon scattering. Emphasis is on the effects of varying the star formation rate and the fraction of UV radiation assumed to escape from the star forming regions, the latter being important mainly for high-red...

Black–body components in Gamma–Ray Bursts spectra?

We study 7 Gamma Ray Bursts (GRBs), detected both by the BATSE instrument, on– board the Compton Gamma Ray Observatory, and by the Wide Field Camera (WFC), on board BeppoSAX. These bursts have measured spectroscopic redshifts and are a sizeable fraction of the bursts defining the correlation between the peak energy Epeak (i.e. the peak of the νFν spectrum) and the total prompt isotropic energy ...