scholarly journals Energy spectra of nuclear fragments produced by high energy protons

1978 ◽  
Vol 17 (4) ◽  
pp. 1368-1381 ◽  
Author(s):  
G. D. Westfall ◽  
R. G. Sextro ◽  
A. M. Poskanzer ◽  
A. M. Zebelman ◽  
G. W. Butler ◽  
...  
Keyword(s):  
High Energy ◽  
Energy Spectra

INVESTIGATION ON THE NEUTRINO INDUCED MUONS FROM ACTIVE GALACTIC NUCLEI

2000 ◽  
Vol 15 (25) ◽  
pp. 1567-1576
Author(s):  
NAYANTARA GUPTA ◽  
D. P. BHATTACHARYYA
Keyword(s):  
Cross Sections ◽  
Neutrino Flux ◽  
High Energy ◽  
Energy Spectra ◽  
Muon Energy ◽  
Model Calculations ◽  
Charge Current ◽  
Upper Limits ◽  
Total Interaction ◽  
Interaction Cross Sections

The fluxes of neutrino induced muons at different zenith angles have been calculated using the high energy diffused neutrino spectra emitted from blazars. We have used the standard formulation developed by Gaisser based on charge-current interactions in rock and the QED-based energy loss formulation to estimate the spectra of neutrino induced muons. The energy spectra of neutrino flux generated from blazars has been taken from the model calculations of Protheroe. The latest charge-current and total interaction cross-sections at ultrahigh energies from Kwiecinski et al. have been used to find the probability of muon generation from neutrinos and the loss of neutrinos during propagation through the Earth. We find that our derived horizontal neutrino induced muon energy spectra expected from blazar model of Protheroe is comparable with the upper limits as predicted by SOUDAN 2 experiment.

Self-modulated wakefield acceleration in a centimetre self-guiding channel

2012 ◽  
Vol 78 (4) ◽  
pp. 433-440 ◽  
Author(s):  
C. KAMPERIDIS ◽  
C. BELLEI ◽  
N. BOURGEOIS ◽  
M. C. KALUZA ◽  
K. KRUSHELNICK ◽  
...  
Keyword(s):  
Focal Spot ◽  
Spot Size ◽  
High Energy ◽  
Energy Spectra ◽  
Focal Spot Size ◽  
Electron Bunches ◽  
Gas Jets ◽  
Wakefield Acceleration ◽  
Helium Gas ◽  
Broad Energy

AbstractSelf-modulated wakefield acceleration was investigated at densities down to ~4 × 1018 cm−3 by propagating the 50 TW 300 fs LULI laser in helium gas jets at lengths up to 1 cm. Long interaction lengths were achieved by closer matching of the initial focal spot size to the matched spot size for these densities. Electrons with energies extending to 180 MeV were observed in broad energy spectra which show some evidence for non-Maxwellian features at high energy. Two-dimensional PIC simulations indicate that the intial laser pulse breaks up into small pulselets that are eventually compressed and focused inside the first few plasma periods, leading to a ‘bubble-like’ acceleration of electron bunches.

Composition and spectra of primary cosmic-ray electrons and nuclei above 10 10 eV

1975 ◽  
Vol 277 (1270) ◽  
pp. 349-363 ◽  
Keyword(s):  
Cosmic Ray ◽  
High Energy ◽  
Energy Spectra ◽  
Average Lifetime ◽  
Interstellar Space ◽  
Interstellar Matter ◽  
Electromagnetic Interactions ◽  
Nuclear Species ◽  
The Galaxy ◽  
High Energy Particles

Recent experiments have extended the knowledge of the flux and energy spectra of individual cosmic-ray components to much higher energies than had previously been accessible. Both electron and nuclear components show a behaviour at high energy which is unexpected, and which carries information regarding the sources and the propagation of particles between sources and observer. Electromagnetic interactions which are suffered by the electrons in interstellar space should steepen their spectrum, a steepening that would reveal the average lifetime a cosmic-ray particle spends in the galaxy. Measurements up to 1000 GeV show no such steepening. It was discovered that the composition of the nuclear species which is now measured up to 100 GeV/nucleon changes with energy. This change indicates traversal of less interstellar matter by the high energy particles than by those of lower energy. We discuss the experimental evidence and its implication.

Inelastic High-Energy Electron Spectrafrom Plane-Parallel Layer-Nonhomogeneous Surfaces

1991 ◽  
Vol 46 (10) ◽  
pp. 851-857 ◽  
Author(s):  
V. P. Afanas’ev ◽  
D. Naujoks
Keyword(s):  
Solid Angle ◽  
High Energy ◽  
Initial Energy ◽  
Energy Spectra ◽  
Invariant Imbedding ◽  
Adequate Description ◽  
Reflection Function ◽  
Plane Parallel ◽  
Parallel Layer ◽  
Method Of Invariant Imbedding

AbstractWe consider inelastic backscattering of electrons with initial energy of tens and hundreds of keV by plane-parallel homogeneous and sandwiched targets. Basing on the invariance principle, we find expressions that describe the dynamics of the changes in the energy spectra of electrons reflected into a given solid angle that occur with increase of the thickness of films of different materials on substrates of finite and infinite thickness. We substantiate a procedure of linearizing the equations for the reflection function obtained by the method of invariant imbedding. We obtain an analytical solution of linearized equations in the form of a series in Legendre polynomials. A comparison with experimental data shows that the theory developed gives an adequate description of the process of electron backscattering.

scholarly journals Measurements of cross sections for the 209Bi(n, 4n) reaction by using high energy neutrons with continuous energy spectra

2017 ◽  
Vol 146 ◽  
pp. 11043 ◽  
Author(s):  
Kyung Joo Min ◽  
Sang-In Bak ◽  
Cheolmin Ham ◽  
Eun Jin In ◽  
Do Yoon Kim ◽  
...  
Keyword(s):  
Cross Sections ◽  
High Energy ◽  
Energy Spectra ◽  
Continuous Energy

scholarly journals Nuclear disintegrations produced by cosmic rays

1949 ◽  
Vol 196 (1046) ◽  
pp. 325-343 ◽  
Keyword(s):  
Cosmic Radiation ◽  
High Energy ◽  
Energy Spectra ◽  
Angular Distributions ◽  
Excitation Energies ◽  
Wide Range ◽  
High Energy Tail ◽  
Energy And Angular Distributions ◽  
Photographic Emulsions ◽  
Α Particles

Measurements have been made on the energy and angular distributions of the charged particles from disintegration ‘stars’ produced in the silver and bromine nuclei of photographic emulsions exposed to cosmic radiation. The observations extended over a wide range of excitation energies (100 to 700 MeV). The energy spectra and angular distributions of the protons can be explained in all cases by simple evaporation theory. This energy distribution shows also a high-energy tail consisting of direct knock-on protons and slow mesons. At high excitation energies the α-particles exhibit collimation effects which are probably due to localized ‘boiling’ or a form of fission.

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