Nuclear interactions at high energies

1968 ◽  
Vol 46 (10) ◽  
pp. S697-S699
Author(s):  
Yu. A. Eremenko ◽  
Yu. T. Lukin ◽  
Zh. S. Takibaev
Keyword(s):  
Energy Region ◽  
Free Path Length ◽  
Mean Free Path ◽  
Mean Value ◽  
Laboratory System ◽  
High Energies ◽  
Charged Secondary ◽  
The Mean ◽  
Charged Mesons ◽  
Ionization Calorimeter

Fifty jets recorded by an installation consisting of an ionization calorimeter and a cloud chamber have been analyzed. The mean energy of the primaries was 350 GeV and the mean number of charged secondary particles was [Formula: see text]. The target was made of carbon with a thickness of 0.08 interaction mean free path length. It is shown that in the energy region under investigation γc determined by Castagnoli's method is overestimated. It is also concluded that the distribution in Duller–Walker coordinates will give no information about the angles of emission of secondaries in their fireball rest system. If there are not more than two fireballs in the energy region [Formula: see text], then their mean mass is about 3 GeV. The distribution of 4-momentum transfers was measured; the mean value is of the order [Formula: see text]. It was possible to estimate the inelasticity coefficients by independent methods. The mean fraction of the energy transferred to π0 mesons was [Formula: see text] and to the charged mesons [Formula: see text], and the total inelasticity coefficient in the laboratory system was [Formula: see text].

Anisotropy of the mean free path length in stationary gas flows

1970 ◽  
Vol 18 (4) ◽  
pp. 459-463 ◽  
Author(s):  
A. L. Stasenko
Keyword(s):  
Free Path ◽  
Path Length ◽  
Free Path Length ◽  
Mean Free Path ◽  
Gas Flows ◽  
The Mean

PROBABILITY AND TIME OF PHOTOFISSION IN THE QUASI-DEUTERON ENERGY REGION

1993 ◽  
Vol 02 (04) ◽  
pp. 827-834 ◽  
Author(s):  
G. KANIADAKIS ◽  
U. LUCIA ◽  
P. QUARATI
Keyword(s):  
Differential Equation ◽  
Numerical Analysis ◽  
Free Path ◽  
Energy Region ◽  
Mean Free Path ◽  
Point Of View ◽  
Deuteron Energy ◽  
The Mean

Using results of a previous phenomenological and numerical analysis of the photofission of Bi, Th and U in the QD energy region, we study the photofission probability as the solution of a differential equation of Clausius-Clapeyron type and derive an expression for the time of photofission. We argue about some aspects of the photofission dynamics from a thermodynamical point of view and suggest the introduction of some nuclear thermodynamical quantities. The photofission time statistically formulated on the base of the mean free path of the pn pair inside the fissioning nucleus is also examined.

scholarly journals The Random Walks between Pseudo-Specific DNA Sites as Model of the Facilitated Diffusion of DNA-Binding Proteins

2015 ◽  
Vol 10 (2) ◽  
pp. 473-481
Author(s):  
Р.Т. Сибатов ◽  
R.T. Sibatov
Keyword(s):  
Random Walks ◽  
First Passage Time ◽  
Regulatory Protein ◽  
Free Path Length ◽  
Mean Free Path ◽  
Passage Time ◽  
Facilitated Diffusion ◽  
One Dimensional ◽  
Ballistic Motion ◽  
The Mean

The facilitated diffusion of a regulatory protein in the process of searching for a specific target site on the DNA molecule is considered. On the basis of the hypothesis of ballistic motion of the protein between scatterings of pseudo-specific sites, we proposed a phenomenological model of one-dimensional translocation of the protein along DNA. Combining this approach with the model of discrete random walks we were able to get the relationships between the mean first passage time and such characteristics as the binding energy, the mean free path length between pseudo-specific sites, the speed of protein movement and the temperature. These dependencies allow revealing the thermal and energetic optima, at which minimum values of searching time are achieved.

A measurement of the energy fraction transferred to neutral pions in interactions of about 200 GeV

1968 ◽  
Vol 46 (10) ◽  
pp. S678-S680 ◽  
Author(s):  
I. N. Fetisov ◽  
A. E. Morozov ◽  
S. A. Slavatinsky
Keyword(s):  
Mean Value ◽  
Lead Nucleus ◽  
Energy Fraction ◽  
Neutral Pions ◽  
Active Particles ◽  
200 Gev ◽  
The Mean ◽  
Ionization Calorimeter

The energy transferred to neutral π mesons in the interaction of nuclear-active particles with the lead nucleus was studied with an ionization calorimeter. The mean value of the energy transferred to π0 mesons is [Formula: see text]. The [Formula: see text] distribution is also presented.

scholarly journals KINETIC DESCRIPTION OF HADRON–HADRON COLLISIONS

2008 ◽  
Vol 17 (08) ◽  
pp. 1577-1589 ◽  
Author(s):  
ZHI GUANG TAN ◽  
S. TERRANOVA ◽  
A. BONASERA
Keyword(s):  
Energy Density ◽  
Free Path ◽  
Transport Model ◽  
Mean Free Path ◽  
Critical Value ◽  
Kinetic Description ◽  
Pp Collisions ◽  
High Energies ◽  
Mit Bag Model ◽  
The Mean

A transport model based on the mean free path approach to describe pp collisions is proposed. We assume that hadrons can be treated as bags of partons similarly to the MIT bag model. When the energy density in the collision is higher than a critical value, the bags break and partons are liberated. The partons expand and can coalesce to form new hadrons. The results obtained compare very well with available data, and some predictions for higher energies collisions are discussed. Based on the model we suggest that a QGP could already be formed in pp collisions at high energies.

Inelastic interaction cross sections for nuclear-active particles of energy 5 × 1010 to 1012 eV on carbon and iron nuclei

1968 ◽  
Vol 46 (10) ◽  
pp. S689-S693 ◽  
Author(s):  
E. L. Andronikashvili ◽  
G. E. Chikovani ◽  
D. I. Garibashvili ◽  
L. L. Gabunia ◽  
D. B. Kakauridze ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Sea Level ◽  
Cross Sections ◽  
Mean Free Path ◽  
Inelastic Interaction ◽  
Total Thickness ◽  
Active Particles ◽  
The Mean ◽  
Interaction Cross Sections ◽  
Ionization Calorimeter

Inelastic interactions of nuclear-active particles in carbon and iron have been studied using cloud chambers in a magnetic field and an ionization calorimeter at Tskhra-Tskharo Pass at an altitude of 2 500 m above sea level. The installation consists of two cloud chambers 2 × 1 × 0.4 m3 in a magnetic field of 7 000 oersteds and an ionization calorimeter of total thickness about 800 g/cm2. It is triggered when an energy greater than 5 × 1010 eV is released in the ionization calorimeter. The measurements in carbon and iron can be taken simultaneously. Results taken up to the present show that the mean free path for carbon is (96 ± 13) g/cm2 and for iron (130 ± 6) g/cm2.

Applying the mean free-path length model to juvenile Chinook salmon migrating in the Sacramento River, California

2020 ◽  
Vol 103 (12) ◽  
pp. 1603-1617
Author(s):  
Anna E. Steel ◽  
James J. Anderson ◽  
Brian Mulvey ◽  
David L. Smith
Keyword(s):  
Free Path ◽  
Chinook Salmon ◽  
Path Length ◽  
Free Path Length ◽  
Mean Free Path ◽  
Sacramento River ◽  
Juvenile Chinook Salmon ◽  
The Mean ◽  
Juvenile Chinook

Long-period modulated superstructures in Pd-12.5 at.%Ce and Pd-15 at.%Ce alloys

1990 ◽  
Vol 48 (4) ◽  
pp. 164-165
Author(s):  
Noriyuki Kuwano ◽  
Masaru Itakura ◽  
Kensuke Oki
Keyword(s):  
Electron Microscopy ◽  
Mean Value ◽  
Heavy Elements ◽  
Arc Furnace ◽  
X Ray ◽  
Long Period ◽  
Ultra High Purity ◽  
Heat Treated ◽  
Atomic Scattering ◽  
The Mean

Pd-Ce alloys exhibit various anomalies in physical properties due to mixed valences of Ce, and the anomalies are thought to be strongly related with the crystal structures. Since Pd and Ce are both heavy elements, relative magnitudes of (fcc-fpd) are so small compared with <f> that superlattice reflections, even if any, sometimes cannot be detected in conventional x-ray powder patterns, where fee and fpd are atomic scattering factors of Ce and Pd, and <f> the mean value in the crystal. However, superlattices in Pd-Ce alloys can be analyzed by electron microscopy, thanks to the high detectability of electron diffraction. In this work, we investigated modulated superstructures in alloys with 12.5 and 15.0 at.%Ce.Ingots of Pd-Ce alloys were prepared in an arc furnace under atmosphere of ultra high purity argon. The disc specimens cut out from the ingots were heat-treated in vacuum and electrothinned to electron transparency by a jet method.

THE MAGNETIC ANISOTROPY OF Ni AND THE MEAN FREE PATH OF THE ELECTRONS

1971 ◽  
Vol 32 (C1) ◽  
pp. C1-539-C1-540 ◽  
Author(s):  
K. HAUSMANN ◽  
M. WOLF
Keyword(s):  
Magnetic Anisotropy ◽  
Free Path ◽  
Mean Free Path ◽  
The Mean

Partition Coefficient Ratios and Tumour Perfusion Studied with 85mKr and 133Xe

1987 ◽  
Vol 26 (06) ◽  
pp. 253-257
Author(s):  
M. Mäntylä ◽  
J. Perkkiö ◽  
J. Heikkonen
Keyword(s):  
Partition Coefficient ◽  
Partition Coefficients ◽  
Regional Blood Flow ◽  
Blood Perfusion ◽  
Compartmental Analysis ◽  
Malignant Tumour ◽  
Mean Value ◽  
Perfusion Rate ◽  
Biological Variables ◽  
The Mean

The relative partition coefficients of krypton and xenon, and the regional blood flow in 27 superficial malignant tumour nodules in 22 patients with diagnosed tumours were measured using the 85mKr- and 133Xe-clearance method. In order to minimize the effect of biological variables on the measurements the radionuclides were injected simultaneously into the tumour. The distribution of the radiotracers was assumed to be in equilibrium at the beginning of the experiment. The blood perfusion was calculated by fitting a two-exponential function to the measuring points. The mean value of the perfusion rate calculated from the xenon results was 13 ± 10 ml/(100 g-min) [range 3 to 38 ml/(100 g-min)] and from the krypton results 19 ± 11 ml/(100 g-min) [range 5 to 45 ml/(100 g-min)]. These values were obtained, if the partition coefficients are equal to one. The equations obtained by using compartmental analysis were used for the calculation of the relative partition coefficient of krypton and xenon. The partition coefficient of krypton was found to be slightly smaller than that of xenon, which may be due to its smaller molecular weight.

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