The measurement of mean free path λs using a slowing down time lead spectrometer in the 1–10 eV energy region

With a 152m EuO3 source and a Sm 2 O 3 scatter er, nuclear y-ray resonance scattering and resonance fluorescence self-absorption experiments were performed to determine the lifetime of the 961 keV 1 - level in 152 Sm. The value obtained from scattering , (8±2) x 10 -14 s, is larger than that determined from self absorption , (4.7±0.5) x 10 -14 s; this could be due to in adequate know ledge about the slowing down of the source nuclei before the emission of the y-ray. From a comparison of these values, a mean free path of 0.6 x 10 -8 cm for the source nucleus recoiling after electron capture in 152 Eu 2 O 3 has been calculated.

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Inverse mean free path of swift electrons in metals irradiated by a strong laser field

Laser and Particle Beams ◽

10.1017/s0263034603211174 ◽

2003 ◽

Vol 21 (1) ◽

pp. 91-96

Author(s):

JUAN CARLOS MORENO-MARÍN ◽

ISABEL ABRIL ◽

RAFAEL GARCIA-MOLINA ◽

NÉSTOR R. ARISTA

Keyword(s):

Free Path ◽

Laser Field ◽

Random Phase ◽

Mean Free Path ◽

Dynamical Response ◽

Strong Laser Field ◽

Slowing Down ◽

Exchange Processes ◽

High Intensity Laser ◽

Main Effects

We analyze the influence of a high-intensity laser field in the inverse mean free path of electrons moving through a degenerate electron gas. Our calculations are based on the random-phase-approximation formalism, in terms of the dielectric function of the medium, where the effects of the laser field are included in the dynamical response. The main effects on the slowing down of the electrons are studied as a function of the intensity and frequency of the laser field, as well as a function of the projectile velocity. A modification of the electron inverse mean free path for plasmon and electron-hole excitations is obtained due to multiphoton-exchange processes.

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

International Journal of Modern Physics E ◽

10.1142/s0218301393000376 ◽

1993 ◽

Vol 02 (04) ◽

pp. 827-834 ◽

Cited By ~ 5

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.

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Mean Free Path for Plasmon Excitation in Aluminum in the Energy Region from 1.5 to 10.9 keV

Journal of the Physical Society of Japan ◽

10.1143/jpsj.44.1196 ◽

1978 ◽

Vol 44 (4) ◽

pp. 1196-1203 ◽

Cited By ~ 7

Author(s):

Nobuhito Ishigure ◽

Chizuo Mori ◽

Tamaki Watanabe

Keyword(s):

Free Path ◽

Energy Region ◽

Mean Free Path ◽

Plasmon Excitation

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TIME DEPENDENCE OF THE SLOWING DOWN OF NEUTRONS WITH CONSTANT SCATTERING MEAN FREE PATH

10.2172/4347198 ◽

1952 ◽

Author(s):

G Bell ◽

H Bethe ◽

W Goad, Jr

Keyword(s):

Time Dependence ◽

Free Path ◽

Mean Free Path ◽

Slowing Down

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Role of Finite Vacancy Relaxation Rate at SHS Reactions in Nanosized Multilayers

Defect and Diffusion Forum ◽

10.4028/www.scientific.net/ddf.309-310.215 ◽

2011 ◽

Vol 309-310 ◽

pp. 215-222

Author(s):

T.V. Zaporozhets ◽

Andriy Gusak

Keyword(s):

Relaxation Rate ◽

Free Path ◽

Vacancy Concentration ◽

Free Path Length ◽

Mean Free Path ◽

Temperature Dependent ◽

Slowing Down ◽

Vacancy Generation ◽

Synthesis Reactions

Rate of SHS (self-propagating high-tеmperature synthesis) reactions in solid nano-sized multilayers is controlled by the time and temperature dependent vacancy concentration. The increase of reaction temperature is typically faster than the rate of vacancy generation. Therefore, the finite relaxation rate of vacancies leads to drastic slowing down of SHS. On the other hand, as-prepared vacancy supersaturation due to fast deposition on the cold substrate may lead to a certain acceleration of SHS. Influence of (1) vacancy mean free path and (2) initial vacancy supersaturation on the SHS rate is investigated numerically. In wide region of parameters the front velocity appears to be inversely proportional to the square root of vacancy mean free path length.

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