scholarly journals Prompt gamma rays from 252Cf(sf) and their angular distributions

2018 ◽  
Vol 169 ◽  
pp. 00014
Author(s):  
Andreas Oberstedt ◽  
Robert Billnert ◽  
Angélique Gatera ◽  
Alf Göök ◽  
Stephan Oberstedt
Keyword(s):  
Monte Carlo ◽  
Gamma Rays ◽  
Spontaneous Fission ◽  
Angular Distributions ◽  
Recent Measurement ◽  
Prompt Gamma ◽  
Experimental Setup ◽  
Angular Correlations ◽  
Γ Rays ◽  
Prompt Fission

In a recent measurement of prompt γ rays from the spontaneous fission of 252Cf an experimental setup was chosen that allowed the study of angular correlations between γ rays and the nuclei from which they were emitted. The observed angular distribution of prompt fission γ rays was then analyzed to estimate the relative contributions from radiation of different multipolarity. First preliminary results are presented and compared to previous angular correlation measurements from different fission processes and recent results from calculations with the Monte Carlo Hauser-Feshbach code FIFRELIN.

scholarly journals Systematic measurements of prompt fission γ rays – and what they tell us about fission fragment de-excitation

2019 ◽  
Vol 211 ◽  
pp. 04001
Author(s):  
Andreas Oberstedt ◽  
Angélique Gatera ◽  
Alf Göök ◽  
Stephan Oberstedt
Keyword(s):  
Monte Carlo ◽  
Angular Distribution ◽  
Fission Fragment ◽  
Spontaneous Fission ◽  
Recent Measurement ◽  
Experimental Setup ◽  
Angular Correlations ◽  
Preliminary Results ◽  
Γ Rays ◽  
Prompt Fission

In a recent measurement of prompt γ rays from the spontaneous fission of 252Cf an experimental setup was chosen that allowed the study of angular correlations between γ rays and the nuclei from which they were emitted. The observed angular distribution of prompt fission γ rays was then analyzed to estimate the relative contributions from radiation of different multipolarity. Preliminary results are presented and compared to previous angular correlationmeasurements from different fission processes and recent results from calculations with the Monte Carlo Hauser-Feshbach code FIFRELIN.

scholarly journals Prompt fission gamma rays and their angular distributions

2018 ◽  
Vol 193 ◽  
pp. 03005
Author(s):  
Andreas Oberstedt ◽  
Robert Billnert ◽  
Angélique Gatera ◽  
Alf Göök ◽  
Stephan Oberstedt
Keyword(s):  
Gamma Rays ◽  
Spontaneous Fission ◽  
Neutron Emission ◽  
Early Stage ◽  
Angular Distributions ◽  
Recent Measurement ◽  
Excitation Process ◽  
Angular Correlations ◽  
Γ Rays ◽  
Prompt Fission

In a recent measurement of prompt γ rays from the spontaneous fission of 252Cf an experimental setup was chosen that allowed the study of angular correlations between γ rays and the nuclei from which they were emitted. The observed angular distribution of the prompt fission γ rays was then analyzed to estimate the relative contributions from radiation of different multipolarity. From that we hope to obtain more detailed information about the early stage of the de-excitation process of fission fragments, right after prompt neutron emission. First preliminary results are presented below.

Comparison of MC Geant4 simulation with the measurements of gamma photons produced by neutrons

2019 ◽  
Vol 34 (06) ◽  
pp. 1950046
Author(s):  
M. Kasztelan ◽  
K. Jȩdrzejczak ◽  
J. Szabelski
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Gamma Rays ◽  
Neutron Capture ◽  
Germanium Detector ◽  
Gamma Line ◽  
Geant4 Simulation ◽  
Experimental Setup ◽  
Hydrogen Line

In this work, we have focused on results of measurements of the hydrogen line 2223 keV and compared them with the results of Geant4 simulations. The paraffin containing hydrogen was irradiated by neutrons produced by the weak AmBe source. Produced gammas were measured with the germanium detector. The experimental setup was placed inside a carbon chamber which provided the shielding from the external neutrons. The measurements were performed for different amounts of paraffin. The processes playing a role in the description of our measurements are transport and moderation of neutrons, production of gamma rays in neutron-hydrogen interactions, transport and detection of gamma rays. It has been shown that the correctly carried out Monte Carlo simulations reproduced the measured values of the intensity of the observed gamma line 2223 keV from the neutron capture on hydrogen. The absorption of gamma rays is also described correctly. This has been shown in comparing the measurements of gamma line 322 keV from [Formula: see text]Pb with the simulations.

T-odd angular correlations in the emission of prompt gamma rays and neutrons in nuclear fission induced by polarized neutrons

2011 ◽  
Vol 74 (5) ◽  
pp. 671-674 ◽  
Author(s):  
G. V. Danilyan ◽  
J. Klenke ◽  
V. A. Krakhotin ◽  
Yu. N. Kopach ◽  
V. V. Novitsky ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Nuclear Fission ◽  
Prompt Gamma ◽  
Polarized Neutrons ◽  
Angular Correlations

scholarly journals Prompt Fission Gamma-Ray Measurements at UML Research Reactor

2020 ◽  
Vol 242 ◽  
pp. 01009
Author(s):  
Razvan Stanescu ◽  
Hadrick Green ◽  
Toby Morris ◽  
Gencho Rusev ◽  
Marian Jandel
Keyword(s):  
Gamma Rays ◽  
Research Reactor ◽  
Gamma Ray ◽  
Fission Neutron ◽  
Pulse Shape Discrimination ◽  
Prompt Gamma ◽  
Fission Reaction ◽  
Induced Fission ◽  
Enriched Uranium ◽  
Prompt Fission

Neutron-induced fission of 235U was studied at the thermal column of the UMass Lowell 1 MW Research Reactor. A collimated, 2.25-inch diameter beam of thermal neutrons with the flux of ~5x105 n/cm2/sec induced fission reaction on a plate of low-enriched uranium with the areal density ~25 mg/cm2 of 235U. We have used the prompt fission-neutron tagging method to identify the fission reaction in the off-line analysis. The method employs the pulse-shape discrimination of neutrons and gamma-ray events in stilbene scintillator and enables identification of coincidence events of prompt fission gamma-rays and prompt fission neutrons in coincidence time intervals less than 20-30 ns. The prompt gamma-ray radiation was detected using two co-linear NaI(Tl) detectors. The measured spectra of prompt-fission gamma rays between 150 keV and 6 MeV are presented. The results from these initial measurements demonstrate the feasibility of the experimental method. Future measurements with extended arrays of detectors are planned.

scholarly journals Synchrotron radiation from giant e± pair halos

2011 ◽  
Vol 7 (S284) ◽  
pp. 417-419 ◽  
Author(s):  
A. Eungwanichayapant ◽  
W. Maithong ◽  
D. Ruffolo
Keyword(s):  
Magnetic Field ◽  
Monte Carlo ◽  
Synchrotron Radiation ◽  
Gamma Rays ◽  
Angular Distributions ◽  
Spectral Energy ◽  
Microwave Background ◽  
Energy Distributions ◽  
X Ray ◽  
Intergalactic Magnetic Field

AbstractA giant e± pair halo is formed by electromagnetic cascades developing around an AGN under the intergalactic magnetic field (1nG - 1μG). Many studies have been focussed on the pair halos in the gamma band because it has been predicted that the e±s in the pair halos up-scatter the Cosmic Microwave Background (CMB) to be gamma-rays. However, the pair halos do not emit only gamma photons but also X-ray photons via synchrotron radiation. In this paper, the Spectral Energy Distributions (SEDs) and the angular distributions of the synchrotron radiation of the pair halos from the Monte Carlo simulations will be discussed.

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