Search for low-energy interplanetary positrons

1968 ◽  
Vol 46 (10) ◽  
pp. S527-S529 ◽  
Author(s):  
T. L. Cline ◽  
E. W. Hones Jr.
Keyword(s):  
Counting Rate ◽  
Cosmic Ray ◽  
Primary Component ◽  
Low Energy ◽  
Charge Ratio ◽  
Great Abundance ◽  
Independent Source ◽  
Equilibrium Charge ◽  
Energy Dependent ◽  
Background Effect

Preliminary results of an experiment designed to detect and measure the intensity of interplanetary positrons of energy 0–3 MeV with the satellites OGO-I and OGO-III are outlined. Evidence for a statistically significant counting rate of detected positrons is presented, and the possibility that these particles represent a true primary component rather than a background effect, such as cosmic-ray induced secondaries in the detector, is considered. It is shown that the apparent intensity of low-energy positrons, assuming that value derived from their counting rate, would be consistent with an equilibrium charge ratio. This result would not be predicted with mechanisms involving the ionization of matter or the acceleration of electrons, but would be consistent with a strongly energy-dependent galactic trapping parameter allowing meson-decay electrons to slow down in great abundance, or with the existence of an independent source.

The results of simultaneous measurements of the cosmic-ray intensity over the Antarctic and Arctic

1968 ◽  
Vol 46 (10) ◽  
pp. S823-S824
Author(s):  
S. N. Vernov ◽  
A. N. Charakhchyan ◽  
T. N. Charakhchyan ◽  
Yu. J. Stozhkov
Keyword(s):  
Cosmic Rays ◽  
Temperature Effects ◽  
Cosmic Ray ◽  
Primary Component ◽  
Low Energy ◽  
Cosmic Ray Intensity ◽  
Simultaneous Measurements ◽  
Murmansk Region ◽  
The Antarctic

The results of the analysis of data obtained from measurements carried out by means of regular stratospheric launchings of cosmic-ray radiosondes over the Murmansk region and the Antarctic observatory in Mirny in 1963–66 are presented. The problem of the anisotropy of the primary component of low-energy cosmic rays and of temperature effects on the cosmic-ray intensity in the atmosphere are discussed.

A proposed apparatus for the measurement of the cosmic-ray muon momentum spectrum and charge ratio, and the investigation of muon interactions

1968 ◽  
Vol 46 (10) ◽  
pp. S1135-S1139 ◽  
Author(s):  
R. M. Bull ◽  
W. F. Nash ◽  
Wendy J. Milne ◽  
R. E. Woodham ◽  
Y. Yeivin ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Momentum Spectrum ◽  
Muon Flux ◽  
Low Energy ◽  
Charge Ratio ◽  
Energy Component ◽  
Expected Performance ◽  
Muon Momentum

The construction of a cosmic-ray spark-chamber spectrometer for use in the study of the charge ratio and interactions of muons at energies up to 3 000 GeV is proposed. The apparatus will consist of a stack of interleaved spark chambers and magnetized iron plates, placed at a depth of 250 m.w.e. underground in order to remove the low-energy component of the cosmic-ray muon flux. This report gives an appraisal of the design of the apparatus and summarizes its expected performance.

The muon spectra near the geomagnetic equator

1968 ◽  
Vol 46 (10) ◽  
pp. S301-S305 ◽  
Author(s):  
O. C. Allkofer ◽  
R. D. Andresen ◽  
W. D. Dau
Keyword(s):  
Integral Intensity ◽  
Geomagnetic Latitude ◽  
Cosmic Ray ◽  
Momentum Spectrum ◽  
Low Energy ◽  
Charge Ratio ◽  
Theoretical Spectrum ◽  
Measured Spectrum ◽  
Geomagnetic Equator ◽  
Chamber Technique

The vertical momentum spectrum and the charge ratio of cosmic-ray muons have been investigated in the range 0.3–25 GeV/c at a geomagnetic latitude of λ = 9 °N at sea level. The investigations have been performed by means of a magnetic spectrograph using the spark chamber technique for track location. The measured spectrum in the low-energy region is about 20% smaller than the spectra at high geomagnetic latitudes. The integral intensity for particles which penetrate more than 15 cm of lead is 7.25 × 10−3 cm−2 s−1 sr−1. The theoretical spectrum after Olbert is in agreement with our results.

scholarly journals SELECTED TOPICS IN PLANCK-SCALE PHYSICS

2003 ◽  
Vol 18 (16) ◽  
pp. 1073-1097 ◽  
Author(s):  
Y. JACK NG
Keyword(s):  
Quantum Gravity ◽  
Gamma Ray ◽  
Planck Scale ◽  
Cosmic Ray ◽  
High Energy ◽  
Low Energy ◽  
Quantum Gravity Phenomenology ◽  
Energy Quantum ◽  
Energy Dependent ◽  
Planck Scale Physics

We review a few topics in Planck-scale physics, with emphasis on possible manifestations in relatively low energy. The selected topics include quantum fluctuations of spacetime, their cumulative effects, uncertainties in energy–momentum measurements, and low energy quantum-gravity phenomenology. The focus is on quantum-gravity-induced uncertainties in some observable quantities. We consider four possible ways to probe Planck-scale physics experimentally: (i) looking for energy-dependent spreads in the arrival time of photons of the same energy from GRBs; (ii) examining spacetime fluctuation-induced phase incoherence of light from extragalactic sources; (iii) detecting spacetime foam with laser-based interferometry techniques; (iv) understanding the threshold anomalies in high energy cosmic ray and gamma ray events. Some other experiments are briefly discussed. We show how some physics behind black holes, simple clocks, simple computers, and the holographic principle is related to Planck-scale physics. We also discuss a formulation of the Dirac equation as a difference equation on a discrete Planck-scale spacetime lattice, and a possible interplay between Planck-scale and Hubble-scale physics encoded in the cosmological constant (dark energy).

The role of an energy-dependent inner potential in quantitative low-energy electron diffraction

2000 ◽  
Vol 458 (1-3) ◽  
pp. 155-161 ◽  
Author(s):  
S Walter ◽  
V Blum ◽  
L Hammer ◽  
S Müller ◽  
K Heinz ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Low Energy ◽  
Energy Electron ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron ◽  
Energy Dependent

scholarly journals Measurement of Low-Energy Cosmic-Ray Antiprotons at Solar Minimum

1998 ◽  
Vol 81 (19) ◽  
pp. 4052-4055 ◽  
Author(s):  
H. Matsunaga ◽  
S. Orito ◽  
H. Matsumoto ◽  
K. Yoshimura ◽  
A. Moiseev ◽  
...  
Keyword(s):  
Solar Minimum ◽  
Cosmic Ray ◽  
Low Energy

Are Anomalous Cosmic Rays the Main Contribution to the Low-Energy Galactic Cosmic Ray Spectrum?

2008 ◽  
Vol 680 (2) ◽  
pp. L105-L108 ◽  
Author(s):  
K. Scherer ◽  
H. Fichtner ◽  
S. E. S. Ferreira ◽  
I. Büsching ◽  
M. S. Potgieter
Keyword(s):  
Cosmic Rays ◽  
Cosmic Ray ◽  
Low Energy ◽  
Anomalous Cosmic Rays ◽  
Galactic Cosmic Ray

scholarly journals Studying the low-energy excess in cosmic-ray iron: a possible evidence of a massive supernova activity in the solar neighborhood via primary 60Fe

2021 ◽  
Author(s):  
Nicolo Masi ◽  
M. J. Boschini ◽  
S. Della Torre ◽  
M. Gervasi ◽  
D. Grandi ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Solar Neighborhood ◽  
Low Energy ◽  
Energy Excess

scholarly journals GAPS - Dark matter search with low-energy cosmic ray antideuterons and antiprotons

2016 ◽  
Author(s):  
Philip Von Doetinchem ◽  
Tsuguo Aramaki ◽  
Steven Boggs ◽  
Hideyuki Fuke ◽  
Charles Hailey ◽  
...  
Keyword(s):  
Dark Matter ◽  
Cosmic Ray ◽  
Low Energy ◽  
Dark Matter Search
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