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in subjects: "*Fundamental Constants"

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Computerized data base of the fundamental constants of nature

Fifty-seven fundamental constants of nature were computerized from the up-to-date evaluations of E. R. Cohen and B. N. Taylor. The constants are annotated with regard to symbol, value, uncertainty, and scaling factor. This computerization is part of the scientific data base project of the Information Research Group at Lawrence Livermore Laboratory. The MASTER CONTROL data base management system is used. The computerized fundamental constants can be requested from the ERDA Computer Program Excha… more

Date: December 1, 1975

Creator: Henry, E. A. & Hampel, V. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Proceedings of the Second International Conference on Precision Measurement and Fundamental Constants, June 8-12, 1981

Abstract: This volume presents the Proceedings of the Second International Conference on Precision Measurement and Fundamental Constants, held at the National Bureau of Standards in Gaithersburg, MD, from June 8-12, 1981. Like its 1970 predecessor, the Conference provided an international forum for theoretical, experimental, and applied scientists actively engaged in research on precision measurements relating to the fundamental physical constants, and on the testing of related fundamental theo… more

Date: August 1984

Creator: Taylor, B. N. & Phillips, William D.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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The fundamental and universal nature of Boltzmann`s constant

The nature of Boltzmann`s constant is very unclear in the physics literature. In the first part of this paper, on general considerations, the authors examine this situation in detail and demonstrate the conclusion that Boltzmann`s constant is indeed both fundamental and universal. As a consequence of their development they find there is an important implication of this work for the problem of the entropy of information. In the second part they discuss, Szilard`s famous construction showing in d… more

Date: July 1, 1996

Creator: Biedenharn, L.C. & Solem, J.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The fundamental constants of nature from lattice gauge theory simulations

The fundamental laws of nature as we now know them are governed the fundamental parameters of the Standard Model. Some of these, such as the masses of the quarks, have been hidden from direct observation by the confinement of quarks. They are now being revealed through large scale numerical simulation of lattice gauge theory.

Date: January 1, 2005

Creator: Mackenzie, Paul B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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On the measuremnt of {pi}

Inspired by Stillman Drake`s definition of Galilean Units as those for which [L/T{sup 2} = ({pi}{sup 2}/8)g] where g is any finite, constant acceleration measured in units of L and T, we construct a kinematical dimensional analysis based only on two universal, dimensionless constants. For the linear relation between L and T we use Einsteinian Units L/ = (1)c. For orbiting masses negligible compared to some mass unit M, we use Keplerian Units based on his second law [L{sup 2}/T = (1/2{pi})h/M]. … more

Date: February 1, 1992

Creator: Noyes, H. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Topological Quantization in Units of the Fine Structure Constant

Fundamental topological phenomena in condensed matter physics are associated with a quantized electromagnetic response in units of fundamental constants. Recently, it has been predicted theoretically that the time-reversal invariant topological insulator in three dimensions exhibits a topological magnetoelectric effect quantized in units of the fine structure constant {alpha} = e{sup 2}/{h_bar}c. In this Letter, we propose an optical experiment to directly measure this topological quantization … more

Date: November 11, 2011

Creator: Maciejko, Joseph; /Stanford U., Phys. Dept. /Stanford U., Materials Sci. Dept. /SLAC; Qi, Xiao-Liang; /Station Q, UCSB /Stanford U., Phys. Dept. /Stanford U., Materials Sci. Dept. /SLAC; Drew, H.Dennis; U., /Maryland et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

On the measuremnt of. pi

Inspired by Stillman Drake's definition of Galilean Units as those for which (L/T{sup 2} = ({pi}{sup 2}/8)g) where g is any finite, constant acceleration measured in units of L and T, we construct a kinematical dimensional analysis based only on two universal, dimensionless constants. For the linear relation between L and T we use Einsteinian Units L/ = (1)c. For orbiting masses negligible compared to some mass unit M, we use Keplerian Units based on his second law (L{sup 2}/T = (1/2{pi})h/M). … more

Date: February 1, 1992

Creator: Noyes, H. Pierre

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A Different Look at Dark Energy and the Time Variation of Fundamental Constants

This paper makes the simple observation that a fundamental length, or cutoff, in the context of Friedmann-Lemaitre-Robertson-Walker (FRW) cosmology implies very different things than for a static universe. It is argued that it is reasonable to assume that this cutoff is implemented by fixing the number of quantum degrees of freedom per co-moving volume (as opposed to a Planck volume) and the relationship of the vacuum-energy of all of the fields in the theory to the cosmological constant (or da… more

Date: February 7, 2011

Creator: Weinstein, Marvin

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Workshop Summary: Fundamental Neutron Physics in the United States: An Opportunity in Nuclear, Particle, and Astrophysics for the Next Decade

Low-energy neutrons from reactor and spallation neutron sources have been employed in a wide variety of investigations that shed light on important issues in nuclear, particle, and astrophysics; in the elucidation of quantum mechanics; in the determination of fundamental constants; and in the study of fundamental symmetry violation (Appendix A, Glossary). In many cases, these experiments provide important information that is not otherwise available from accelerator-based nuclear physics facilit… more

Date: August 24, 2001

Creator: Greene, G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Value of fundamental constants

No Description Available.

Date: January 1, 1974

Creator: Parisi, G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

ENAM'04 Fourth International Conference on Exotic Nuclei and Atomic Masses

The conference can trace its origins to the 1950s and 1960s with the Atomic Mass and Fundamental Constants (AMCO) and the Nuclei Far From Stability (NFFS) series of conferences. Held jointly in 1992, the conferences officially merged in 1995 and the fourth conference was held at Callaway Gardens in Pine Mountain, GA and was organized by the Physics Division at Oak Ridge National Laboratory. The conference covered a broad list of topics consisting of a series of invited and contributed presentat… more

Date: January 1, 2005

Creator: Gross, C. J.; Nazarewicz, W. & Rykaczewski, K. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Comparison of IUPAC k0 Values and Neutron Cross Sections to Determine a Self-consistent Set of Data for Neutron Activation Analysis

Independent databases of nuclear constants for Neutron Activation Analysis (NAA) have been independently maintained by the physics and chemistry communities for many year. They contain thermal neturon cross sections s0, standardization values k0, and transition probabilities Pg. Chemistry databases tend to rely upon direct measurements of the nuclear constants k0 and Pg which are often published in chemistry journals while the physics databases typically include evaluated s0 and Pg data from a … more

Date: December 1, 2009

Creator: Firestone, Richard B & Revay, Zsolt

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Nonperturbative estimates of the Standard Model parameters

This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The project objectives were (1) to develop highly optimized codes for the simulation of lattice Quantum Chromodynamics (QCD) on the Connection Machine CM-5, (2) to use these codes to carry out a comprehensive analysis of Standard Model phenomenology using a large statistical sample, and (3) to combine the results of numerical simulations with experi… more

Date: August 1, 1997

Creator: Gupta, R.; Bhattacharya, T.; Tamayo, P.; Grandy, T.; Kilcup, G. & Sharpe, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Effect of the choice of wave functions on theoretical predictions for symmetry breaking processes: a view from the DKP formalism

When considering an elementary particle matrix element, of necessity one must make an assumption, which often goes unnoticed, as to what formalism should be used for the wave functions. A current or interaction Lagrangian-density matrix-element is of the form V = anti psi/sub out/GAMMA psi/sub in/, where psi/sub in/ and anti psi/sub out/ represent the physical ingoing and outgoing particles, and GAMMA represents the vertex function. A current must have the dimensions of (length)/sup -3/ = (mass… more

Date: January 1, 1978

Creator: Nieto, M.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Negative meson capture in hydrogen. [Ionization cross sections, perturbed stationary state method]

The processes of deexcitation and capture of negative mesons and hadrons in atomic hydrogen are investigated. Only slow collisions in which the projectile-atom relative velocity is less than one atomic unit are considered, and the motion of the incident particle is treated classically. For each classical trajectory the probability of ionizing the hydrogen atom is determined, together with the energy spectrum of the emitted electron. Ionization probabilities are calculated using the time-depende… more

Date: January 1, 1977

Creator: Baird, T. J.

Item Type: Report

Partner: UNT Libraries Government Documents Department