Measurement of the VEPP-4M Collider Energy Spread in the Entire Energy Range

2020 ◽  
Vol 17 (3) ◽  
pp. 332-342
Author(s):  
V. M. Borin ◽  
V. L. Dorokhov ◽  
O. I. Meshkov ◽  
Ma Xiao Chao
Keyword(s):  
Energy Range ◽  
Energy Spread ◽  
Collider Energy ◽  
Entire Energy Range ◽  
Entire Energy

Merging beams study of ionization of positive ions by electrons

1972 ◽  
Vol 327 (1570) ◽  
pp. 317-328 ◽  
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Cross Sections ◽  
Atomic Nitrogen ◽  
Efficiency Curve ◽  
Entire Energy Range ◽  
Positive Ions ◽  
Entire Energy ◽  
Product Ions ◽  
Scaling Rule

The technique of beam superposition is employed in the experimental study of ionization of He+, N+ and 0+ by electrons. The electron energy range extends up to 300 eV. The primary and product ions are mass selected. Relative cross-sections for ionization are obtained as a function of the laboratory energy of the electrons. The experimental data for He+ and N+ are quite consistent with published values of the absolute cross-sections for these systems. By using Thomson’s classical scaling rule for isoelectronic systems, the cross-sections for ionization of O+ are calculated from those for ionization of atomic nitrogen. These values, when normalized to the relative ionization efficiency curve obtained experimentally here, show close overlap over the entire energy range.

scholarly journals Interpretation of Cosmic Ray Composition: the Pathlength Distribution

1981 ◽  
Vol 94 ◽  
pp. 107-108
Author(s):  
R. J. Protheroe ◽  
J. F. Ormes
Keyword(s):  
Chemical Composition ◽  
Interstellar Medium ◽  
Energy Range ◽  
Cross Sections ◽  
Cosmic Ray ◽  
Forthcoming Paper ◽  
Ionization Loss ◽  
Entire Energy Range ◽  
Entire Energy ◽  
Energy Dependent

The chemical composition of cosmic ray nuclei with 3≤Z≤28 between ~100 MeV/nuc and a few hundred GeV/nuc are compared with a consistent set of propagation calculations. These include the effects of spallation (energy-dependent cross sections are used), escape and ionization loss in the interstellar medium and deceleration in the solar cavity. This has enabled a consistent study of the cosmic ray pathlength distribution to be made over this entire energy range. Details of the propagation calculation are left to a forthcoming paper.

Modified Heisenberg's Approach for the Mean Charged Hadron Multiplicity in High Energy Collisions

1978 ◽  
Vol 33 (4) ◽  
pp. 493-497
Author(s):  
D. C. Ghosh ◽  
I. K. Daftari ◽  
D. K. Bhattacharjee ◽  
S. C. Naha ◽  
A. Roy Chowdhury ◽  
...  
Keyword(s):  
Energy Range ◽  
High Energy ◽  
Charged Hadron ◽  
Entire Energy Range ◽  
Hadron Multiplicity ◽  
Entire Energy ◽  
High Energy Collisions ◽  
The Mean ◽  
Hadronic Collisions ◽  
Remarkable Agreement

The semiempirical formulation of Ghosh et al. for the energy dependence of multiplicity in hadronic collisions has been applied to account for the experimental multiplicity data of π±p and K±p collisions. A remarkable agreement has been found over the entire energy range.

scholarly journals Monte Carlo Simulation of a HP-Ge Pulse Height Spectrum over the Entire Energy Range

2011 ◽  
Vol 2 (0) ◽  
pp. 908-911
Author(s):  
Dora SOMMER ◽  
Uwe REICHELT ◽  
Kai HELBIG ◽  
Detlev DEGERING ◽  
Jürgen HENNIGER ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Energy Range ◽  
Pulse Height ◽  
Pulse Height Spectrum ◽  
Entire Energy Range ◽  
Entire Energy

The muon charge ratio at 80° to the zenith

1968 ◽  
Vol 46 (10) ◽  
pp. S313-S317 ◽  
Author(s):  
N. S. Palmer ◽  
W. F. Nash
Keyword(s):  
Energy Range ◽  
Sea Level ◽  
Zenith Angle ◽  
Theoretical Models ◽  
Experimental Results ◽  
Charge Ratio ◽  
Entire Energy Range ◽  
Entire Energy

A brief description is given of a spectrograph recently constructed at Nottingham for the study of muons at large zenith angles. The instrument, situated at a latitude of 50 °N and 30 m above sea level, is at present orientated to accept muons incident in the geomagnetic north–south direction at a mean zenith angle of 80°. Experimental results are presented of the charge ratio among muons in the range of production energies 20–500 GeV. The results, which are found to be consistent with a constant or only slowly varying charge ratio over the entire energy range, are compared with the results of other workers and the predictions of some current theoretical models.

scholarly journals Revisiting the decoupling effects in the running of the Cosmological Constant

2018 ◽  
Vol 33 (34) ◽  
pp. 1845013
Author(s):  
Oleg Antipin ◽  
Blaženka Melić
Keyword(s):  
Cosmological Constant ◽  
Higgs Mass ◽  
Vacuum Energy ◽  
Fine Tuning ◽  
Simple Extension ◽  
Heavy Particles ◽  
Entire Energy Range ◽  
The Standard Model ◽  
Entire Energy ◽  
Mass Dependent

We revisit the decoupling effects associated with heavy particles in the renormalization group running of the vacuum energy in a mass-dependent renormalization scheme. We find the running of the vacuum energy stemming from the Higgs condensate in the entire energy range and show that it behaves as expected from the simple dimensional arguments, meaning that it exhibits the quadratic sensitivity to the mass of the heavy particles in the infrared regime. The consequence of such a running to the fine-tuning problem with the measured value of the Cosmological Constant is analyzed and the constraint on the mass spectrum of a given model is derived. We show that in the Standard Model (SM) this fine-tuning constraint is not satisfied while in the massless theories this constraint formally coincides with the well-known Veltman condition. We also provide a remarkably simple extension of the SM where saturation of this constraint enables us to predict the radiative Higgs mass correctly. Generalization to constant curvature spaces is also given.

Resonance dipole–Raman scattering at the forbidden yellow exciton in Cu2O

1976 ◽  
Vol 54 (18) ◽  
pp. 1893-1897
Author(s):  
Gayatri Bhattacharya Choudhury ◽  
K. P. Jain
Keyword(s):  
Kinetic Energy ◽  
Dominant Role ◽  
Detailed Knowledge ◽  
Strong Resonance ◽  
Entire Energy Range ◽  
Resonance Enhancement ◽  
Entire Energy ◽  
Energy Dependent ◽  
Entire Spectral Range ◽  
The Continuum

It has been observed by Yu, Shen, Petroff, and Falicov that there is a strong resonance enhancement in the 220 cm−1 Raman line of Cu2O at the Γ12− phonon-assisted absorption threshold of the forbidden 1s yellow exciton. In this paper we present a more complete theory to explain their experimental results over the entire spectral range. The theory includes both the continuum and discrete scattering. It has been shown that away from the resonance the continuum part plays a dominant role. The kinetic energy of the 1s yellow exciton is incorporated into the theory by introducing an energy-dependent lifetime broadening parameter Γ(ω). In the absence of detailed knowledge of the contribution of various phonons to the exciton lifetimes over the entire energy range, we have chosen to work with a phenomenological Γ(ω).

Positron–Helium Scattering Cross Sections and Phase Shifts below 19 eV

1973 ◽  
Vol 51 (14) ◽  
pp. 1565-1572 ◽  
Author(s):  
B. Jaduszliwer ◽  
D. A. L. Paul
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Phase Shifts ◽  
S Wave ◽  
Wave Phase ◽  
Entire Energy Range ◽  
Nice Agreement ◽  
Scattering Cross Sections ◽  
D Wave

The total cross sections for elastic scattering of positrons in the energy range from 4 to 19 eV have been measured by the method of transmission. By varying a magnetic field applied along the axis of the scattering chamber the transmitted fraction of the beam is altered, from which individual phase shifts can be extracted. s-, p-, and d-wave phase shifts are given over the entire energy range. The s-wave phase shifts are in agreement with values published by Drachman in 1968, while the p- and d-wave phase shifts are intermediate between values calculated by the same author in 1966 and 1971. The experimental results agree with those of Costello et al., and marginally with our own 1972 results, but are significantly different from those of Canter et al. We compute that the Ramsauer minimum in the diffusion cross section must be 0.04πa02 at 1.6 eV while the minimum in the total cross section is 0.11πa02 at 2.1 eV. The shoulder breadth observed in annihilation experiments is in nice agreement with what one would predict from our phase shifts.

Phosphorus and Boron Implantation into (100) Germanium

2004 ◽  
Vol 809 ◽  
Author(s):  
Y. S. Suh ◽  
M. S. Carroll ◽  
R. A. Levy ◽  
A. Sahiner ◽  
C. A. King
Keyword(s):  
Secondary Ion Mass Spectrometry ◽  
Dopant Activation ◽  
Entire Energy Range ◽  
Entire Energy ◽  
Boron Implantation ◽  
Pearson Distributions ◽  
P Type ◽  
First Four Moments ◽  
And Diffusion ◽  
Secondary Ion

ABSTRACTBoron and phosphorus were implanted into (100) Ge with energies ranging from 20-320 keV and doses of 5×1013 to 5×1016 cm−2. The as-implanted and annealed dopant profiles were examined using secondary ion mass spectrometry (SIMS) and spreading resistance profiling (SRP). The first four moments were extracted from the as-implanted profile for modeling with Pearson distributions over the entire energy range. The samples were annealed at 400, 600, or 800°C in nitrogen ambient. The dopant activation and diffusion were also examined and it was found that p-type sheet resistances immediately after boron implantation as low as 18 ohms/sq could be obtained without subsequent annealing.

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