SEARCH · Engineering Papers
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Single particle gun for detector studies: A particle gun with single pions. One pion per event. Production at (x,y,z,t)=(0,0,0,0). Charges are alternated. Flat random transverse momenta with pT from 0 to 100 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-4, 4].
Single particle gun for detector studies: A particle gun with single proton. One particle per event. Production at (x,y,z,t)=(0,0,0,0). Charge is alternated. Flat random transverse momenta with pT from 0 to 100 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-4, 4].
Single particle gun for detector studies: A particle gun with single electrons. One particle per event. Production at (x,y,z,t)=(0,0,0,0). Charge is alternated. Flat random transverse momenta with pT from 0 to 100 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-4, 4].
Single particle gun for detector studies: A particle gun with single muons. One muon per event. Production at (x,y,z,t)=(0,0,0,0). mu+ and mu- are alternated. Flat random transverse momenta with pT from 0 to 150 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-3, 3].
Single particle gun for detector studies: A particle gun with single photons. One gamma per event. Production at (x,y,z,t)=(0,0,0,0). Flat random transverse momenta with pT from 0 to 150 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-3, 3].
Single particle gun for detector studies: A particle gun with single pions. One pion per event. Production at (x,y,z,t)=(0,0,0,0). Charges are alternated. Flat random transverse momenta with pT from 0 to 150 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-3, 3].
Single particle gun for detector studies: A particle gun with single proton. One particle per event. Production at (x,y,z,t)=(0,0,0,0). Charge is alternated. Flat random transverse momenta with pT from 0 to 150 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-3, 3].
Single particle gun for detector studies: A particle gun with single electrons. One particle per event. Production at (x,y,z,t)=(0,0,0,0). Charge is alternated. Flat random transverse momenta with pT from 0 to 150 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-3, 3].
Single particle gun for detector studies: A particle gun with single muons. One muon per event. Production at (x,y,z,t)=(0,0,0,0). mu+ and mu- are alternated. Flat random transverse momenta with pT from 0 to 30 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-4, 4].
Single particle gun for detector studies: A particle gun with single photons. One gamma per event. Production at (x,y,z,t)=(0,0,0,0). Flat random transverse momenta with pT from 0 to 30 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-4, 4].
Single particle gun for detector studies: A particle gun with single proton. One particle per event. Production at (x,y,z,t)=(0,0,0,0). Charge is alternated. Flat random transverse momenta with pT from 0 to 30 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-4, 4].
Single particle gun for detector studies: A particle gun with single pions. One pion per event. Production at (x,y,z,t)=(0,0,0,0). Charges are alternated. Flat random transverse momenta with pT from 0 to 30 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-4, 4].
Single particle gun for detector studies: A particle gun with single electrons. One pion per event. Production at (x,y,z,t)=(0,0,0,0). Charges are alternated. Flat random transverse momenta with pT from 0 to 30 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-3, 3].
Single particle gun for detector studies: A particle gun with single charged kaons (K+ and K-). One particle per event. Production at (x,y,z,t)=(0,0,0,0). Charges are alternated. Flat random transverse momenta with pT from 0 to 30 GeV. Uniform distribution in Phi. Uniform distribution in the Eta (pseudorapidity) range [-4, 4].
PYTHIA version 6.428. All QCD dijet events with minumum pT=10 GeV on the LO matrix LO ellement. 50k events per file.
Here, the Fermi Large Area Telescope (LAT) Collaboration has recently released the Third Catalog of Hard Fermi -LAT Sources (3FHL), which contains 1556 sources detected above 10 GeV with seven years of Pass 8 data. Building upon the 3FHL results, we investigate the flux distribution of sources at high Galactic latitudes ($|b| \gt 20^\circ $), which are mostly blazars. We use two complementary techniques: (1) a source-detection efficiency correction method and (2) an analysis of pixel photon count statistics with the one-point probability distribution function (1pPDF). With the first method, using realistic Monte Carlo simulations of the γ-ray sky, we calculate the efficiency of the LAT to detect point sources. This enables us to find the intrinsic source-count distribution at photon fluxes down to 7.5 × 10 –12 ph cm –2 s –1 . With this method, we detect a flux break at (3.5 ± 0.4) × 10 –11 ph cm –2 s –1 with a significance of at least 5.4σ. The power-law indexes of the source-count distribution above and below the break are 2.09 ± 0.04 and 1.07 ± 0.27, respectively. This result is confirmed with the 1pPDF method, which has a sensitivity reach of ~10 –11 ph cm –2 s –1 . Integrating the derived source-count distribution above the sensitivity of our analysis, we find that (42 ± 8)% of the extragalactic γ-ray background originates from blazars.
Abstract We report the discovery of MeV–GeV γ -ray emission by the Fermi-LAT positionally coincident with the TeV pulsar wind nebula (PWN) HESS J1554–550 within the host supernova remnant (SNR) G327.1–1.1. The γ -ray emission is point-like and faint but significant (>4 σ ) in the 300 MeV–2 TeV energy range. We report here the Fermi-LAT analysis of the observed γ -ray emission followed by a detailed multiwavelength investigation to understand the nature of the emission. The central pulsar powering the PWN within G327.1–1.1 has not been detected in any wave band; however, it is likely embedded within the X-ray nebula, which is displaced from the center of the radio nebula. The γ -ray emission is faint and therefore a pulsation search to determine if the pulsar may be contributing is not feasible. Prior detailed multiwavelength reports revealed an SNR system that is old, τ ∼ 18,000 yr, where the interaction of the reverse shock with the PWN is underway or has recently occurred. We find that the γ -ray emission agrees remarkably well with a detailed broadband model constructed in a prior report based on independent hydrodynamical and semianalytic simulations of an evolved PWN. We further investigate the physical implications of the model for the PWN evolutionary stage incorporating the new Fermi-LAT data and attempt to model the distinct particle components based on a spatial separation analysis of the displaced PWN counterparts.
The Sun is one of the most luminous γ-ray sources in the sky and continues to challenge our understanding of its high-energy emission mechanisms. This study provides an in-depth investigation of the solar disk γ-ray emission, using data from the Fermi Large Area Telescope spanning 2008 August to 2022 January. We focus on γ-ray events with energies exceeding 5 GeV, originating from 0°5 angular aperture centered on the Sun, and implement stringent time cuts to minimize potential sample contaminants. We use a helioprojection method to resolve the γ-ray events relative to the solar rotation axes and combine statistical tests to investigate the distribution of events over the solar disk. We found that integrating observations over large time windows may overlook relevant asymmetrical features, which we reveal in this work through a refined time-dependent morphological analysis. We describe significant anisotropic trends and confirm compelling evidence of energy-dependent asymmetry in the solar disk γ-ray emission. Intriguingly, the asymmetric signature coincides with the Sun's polar field flip during the cycle 24 solar maximum, around 2014 June. Our findings suggest that the Sun's magnetic configuration plays a significant role in shaping the resulting γ-ray signature, highlighting a potential link between the observed anisotropies, solar cycle, and the solar magnetic fields. These insights pose substantial challenges to established emission models, prompting fresh perspectives on high-energy solar astrophysics.