Determination of the coexistence curve, critical temperature, density, and pressure of bulk nuclear matter from fragment emission data

The index of refraction at 6328 Å has been measured for germane in the density range 0.15 to 0.9 g/cm3. The temperature and density ranges over which measurements are made are near the coexistence curve. The coefficient in the Lorenz–Lorentz expression, [Formula: see text], is constant to within 0.5% within experimental error for the temperature range and density range studied. The coefficient is slightly higher near the critical density. The critical density is measured to be 0.503 g/cm3. The critical temperature is measured to be 38.92 °C.

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Determination of the Adsorption Isotherms of Hydrogen on Activated Carbons above the Critical Temperature of the Adsorbate over Wide Temperature and Pressure Ranges

Langmuir ◽

10.1021/la001381x ◽

2001 ◽

Vol 17 (6) ◽

pp. 1950-1955 ◽

Cited By ~ 151

Author(s):

P. Bénard ◽

R. Chahine

Keyword(s):

Critical Temperature ◽

Adsorption Isotherms ◽

Activated Carbons ◽

Temperature And Pressure

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Studies of two-dimensional condensation of water on hydroxylated ZnO, SnO2, and Cr2O3: Determination of two-dimensional critical temperature

Surface Science ◽

10.1016/0039-6028(81)90487-8 ◽

1981 ◽

Vol 109 (2) ◽

pp. 291-300 ◽

Cited By ~ 20

Author(s):

K. Morishige ◽

S. Kittaka ◽

T. Morimoto

Keyword(s):

Critical Temperature ◽

Two Dimensional

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A NUCLEAR MANY-BODY THEORY AT FINITE TEMPERATURE APPLIED TO A PROTONEUTRON STAR

International Journal of Modern Physics E ◽

10.1142/s0218301302000727 ◽

2002 ◽

Vol 11 (02) ◽

pp. 83-104 ◽

Cited By ~ 16

Author(s):

GUILHERME F. MARRANGHELLO ◽

CESAR A. Z. VASCONCELLOS ◽

MANFRED DILLIG ◽

J. A. DE FREITAS PACHECO

Keyword(s):

Phase Transition ◽

Nuclear Matter ◽

Finite Temperature ◽

Degrees Of Freedom ◽

Many Body ◽

Many Body Theory ◽

The Masses ◽

Protoneutron Stars ◽

Protoneutron Star

Thermodynamical properties of nuclear matter are studied in the framework of an effective many-body field theory at finite temperature, considering the Sommerfeld approximation. We perform the calculations by using the nonlinear Boguta and Bodmer model, extended by the inclusion of the fundamental baryon octet and leptonic degrees of freedom. Trapped neutrinos are also included in order to describe protoneutron star properties through the integration of the Tolman–Oppenheimer–Volkoff equations, from which we obtain, beyond the standard relations for the masses and radii of protoneutron stars as functions of the central density, new results of these quantities as functions of temperature. Our predictions include: the determination of an absolute value for the limiting mass of protoneutron stars; new structural aspects on the nuclear matter phase transition via the behavior of the specific heat and, through the inclusion of quark degrees of freedom, the properties of a hadron-quark phase transition and hybrid protoneutron stars

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Reliability of temperature determination from curve-fitting in multi-wavelength pyrometery

Laser and Particle Beams ◽

10.1017/s0263034612001103 ◽

2013 ◽

Vol 31 (2) ◽

pp. 333-336

Author(s):

P.A. Ni ◽

R.M. More ◽

F.M. Bieniosek

Keyword(s):

Ion Beam ◽

Dense Matter ◽

Warm Dense Matter ◽

Emission Data ◽

Reliable Determination ◽

Temperature Determination ◽

Multi Wavelength ◽

Fitting In ◽

Hot Surface

AbstractThis paper examines the reliability of a widely used method for temperature determination by multi-wavelength pyrometry. In recent warm dense matter experiments with ion-beam heated metal foils, we found that the statistical quality of the fit to the measured data is not necessarily a measure of the accuracy of the inferred temperature. We found a specific example where a second-best fit leads to a more realistic temperature value. The physics issue is the wavelength-dependent emissivity of the hot surface. We discuss improvements of the multi-frequency pyrometry technique, which will give a more reliable determination of the temperature from emission data.

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A STUDY OF THE COEXISTENCE OF THE LIQUID AND GASEOUS STATES OF AGGREGATION IN THE CRITICAL TEMPERATURE REGION. ETHYLENE

Canadian Journal of Research ◽

10.1139/cjr40b-016 ◽

1940 ◽

Vol 18b (4) ◽

pp. 118-121 ◽

Cited By ~ 10

Author(s):

S. N. Naldrett ◽

O. Maass

Keyword(s):

Critical Temperature ◽

Temperature Region ◽

Previous Investigation ◽

Coexistence Curve

The coexistence curve of ethylene has been determined in a manner similar to that described in a previous investigation on ethane (9). It is found to lie entirely within the coexistence curve determined by P-V-T methods by other investigators (6). This is considered to be evidence for the formation of a dispersion of liquid and vapour before the critical temperature is reached. The term "critical dispersion temperature" is suggested for the temperature at the apex of the coexistence curve determined by the disappearance of the meniscus in a bomb shaken in the manner described in this investigation. The apex of the curve determined by P-V-T methods is the true critical temperature, beyond which liquid is not stable. The classical critical temperature, determined by the disappearance of the meniscus in a stationary bomb, is an indefinite point between these two.

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