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Measurement of the neutron lifetime using a gravitational trap and a low-temperature Fomblin coating
No full textWe present a new value for the neutron lifetime of 878.5 +/- 0.7(stat.)+/- 0.3(syst). This result differs from the world average value by 6.5 standard deviations and by 5.6 standard deviations from the previous most precise result. However, this new value for the neutron lifetime together with a beta-asymmetry in neutron decay, A(0), of -0.1189(7) is in a good agreement with the Standard Model
Chaotic scattering and escape times of marginally trapped ultracold neutrons
No full textWe compute classical trajectories of Ultracold neutrons (UCNs) in a superconducting Ioffe-type magnetic trap using a symplectic integration method. We find that the computed escape time for a particular set of initial conditions (momentum and position) does not generally stabilize as the time step parameter is reduced unless the escape time is short (less than approximately 10 s). For energy intervals where more than half of the escape times computed for UCN realizations are numerically well determined, we predict the median escape time as a function of the midpoint of the interval
Detector development for the abBA experiment
No full textWe have developed a new type of field-expansion spectrometer to measure the neutron beta decay correlations (a, b, B, and A). A precision measurement of these correlations places stringent requirements on charged particle detectors. The design employs large area segmented silicon detectors to detect both protons and electrons in coincidence. Other requirements include good energy resolution (<5 keV), a thin dead layer to allow observation of 30-keV protons, fast timing resolution(similar to 1 ns) to reconstruct electron-backscattering events, and nearly unity efficiency. We report results of testing commercially available surface-barrier silicon detectors for energy resolution and timing performance, and measurement of the dead-layer thickness of ion-implanted silicon detectors with a 3.2 MeV alpha source
(Audio Part 1 of 4) Oral history interview of Peter L. M. Heydemann, May 4, 2005 / with David Lide, Jack Colwell, Ralph Hudson, Walter Leight, Hans Oser and Harriet Hassler
No full textOral history interview of Peter L. M. Heydemann, May 4, 2005 / with David Lide, Jack Colwell, Ralph Hudson, Walter Leight, Hans Oser and Harriet Hassler
No full textJohn L. Hall
No full textJOHN L. HALL
Inducted: 2005
Citation:
For his distinguished work in in optical and laser physics, including advances in precision spectroscopy that were recognized by the award of the 2005 Nobel Prize in physics.
Tenure: 1961-2004
B: 1934, Denver, Colorado
Education:
Carnegie Institute of Technology, BS (Physics), 1956
Carnegie Institute of Technology, MS (Physics), 1958
Carnegie-Mellon University, PhD (Physics), 1961
Positions held:
Physicist, 1961-1978, Senior Scientist, 1979 - 2004
Senior NBS/NIST Fellow 1988 & Fellow of JILA, 1964-present
Honors:
More than 20 awards including
Nobel Prize in Physics 2005 (joint with T. Hänsch and R. Glauber)
U.S. Department of Commerce Gold Medals (1969, 1974, 2001)
NBS Stratton Award (1971); NBS Condon Award (1979); NIST Astin Award (2000)
OSA Townes Award (1984) (joint with V. P. Chebotayev); OSA Ives Medal (1991); Born Award (2002)
APS Davisson-Germer Prize (1988); APS/DLS Schawlow Prize (1993)
Presidential Rank Award (1980, 2002); IEEE Rabi Award, IEEE (2004)
Republic of France Légion d'Honneur (2004)
Memberships:
American Physical Society (Fellow)
Fellow, Optical Society of America (Fellow)
Delegate, Consultative Committee for the Definition of the Meter (BIPM) Sèvres, France, 1970-2004
National Academy of Sciences, 1984-present
International Union of Radio Science (URSI)
Publications:
More than 235 publications and ten patents, including:
K. M. Evenson, J. S. Wells, F. R. Peterson, B. L. Danielson, G. W. Day, R. L. Barger, and J L. Hall, “Speed of light from direct frequency and wavelength measurements of the methane-stabilized laser,” Phys. Rev. Lett. 29, 1346-1349 (1972)
J. L. Hall, C. J. Bordé and K. Uehara, “Direct optical resolution of the recoil effect using saturated absorption spectroscopy,” Phys. Rev. Lett. 37, 1339-1342 (1976)
J. L. Hall and D. Hils, “Improved Kennedy-Thorndike Experiment to Test Special Relativity,” Phys. Rev. Lett. 64, 1697 (1990)
David J. Jones, Scott A. Diddams, Jinendra K. Ranka, Andrew Stentz, Robert S. Windeler, John L. Hall, Steven T. Cundiff, “Carrier-Envelope Phase Control of Femtosecond Mode-Locked Lasers and Direct Optical Frequency Synthesis,” Science, 288 635 (2000).
John L. Hall, Jun Ye, Scott A. Diddams, Long-Sheng Ma, Steven T. Cundiff, and David J. Jones, “The four Laser Ultras: a New Alliance for Physics and Metrology,” IEEE J. of Quantum Electron. 37, 1482-1492 (2001).
Mark Notcutt, Longsheng Ma, Jun Ye, and John L. Hall, “Simple and compact 1-Hz laser system via improved mounting configuration of a reference cavity,” Opt. Lett.30, 1815 (2005
Rosalie T. Ruegg
No full textRosalie T. Ruegg
Inducted: 2005
Citation:
For path-breaking applications of economic theory to the analysis of capital investments for energy conservation in buildings, and development and direction of the vital economic assessment activities of the Advanced Technology Program.
Tenure: 1970-2000
Birth: 1942, Washington, North Carolina
Education:
University of North Carolina, BA with honors (Economics), 1964
University of Maryland, Woodrow Wilson Fellow, MA (Economics), 1966
American University, MBA (Finance), 1985
Positions held:
Industry Economist, Center for Building Technology 1970-1983
Program Analyst, Director’s Office 1983-1984
Senior Staff Advisor, Associate Director, NEL 1984-1985
Senior Economist, Applied Mathematics Laboratory 1986-1990
Director, Economic Assessment Office, ATP 1990-2000
Honors:
Federal Senior Executive Service, 1995-2000
US Department of Commerce, Silver Medal (1977), Gold Medal (1998)
NIST Outstanding Research Group Award, 1987
Wellington Award, Institute of Industrial Engineers, 2001
Outstanding Publication Award, American Evaluation Association, 2004
Membership:
American Evaluation Association
National Academy of Sciences Committee on Prospective Benefits Evaluation of Energy R&D Programs
Washington Research Evaluation Network
U.S. Women’s Chamber of Commerce
Phi Beta Kappa
Publications:
More than 60 publications, including:
R. Ruegg and I. Feller, A Toolkit for Evaluating Public R&D Investment, NIST GCR 03-857 (2003).
R. Ruegg, “Assessing Portfolio Performance of a Public R&D Program in the Short-to- Intermediate Period,” Plattform fteval: Forschungs- und Technologieevaluierung, No. 19 (2003).
R. Ruegg, “Assessment of the ATP,” The Advanced Technology Program, Challenges and Opportunities, Board on Science, Technology, and Economic Policy, National Research Council, Washington, D.C.: National Academy Press, 1999, pp. 71-81.
R. Ruegg, “Economic Methods,” Handbook of Energy Efficiency, CRC Press, 1997, pp. 101-124.
R. Ruegg and H. Marshall, Building Economics, Theory and Practice, New York, Van Nostrand Reinhold, 1990
Sharon G. Lias
No full textSHARON G. LIAS
NBS/NIST: 1956-2001
Birth: 16 September 1935, Cherokee, Oklahoma
EDUCATION:
College of William and Mary, BS (Chemistry), 1957
American University, MS (Physical Chemistry), 1965
American University, PhD (Physical Chemistry), 1972
PRINCIPAL FIELDS:
Ion properties and mass spectrometry reference data; measurement and evaluation of thermodynamic properties and rates of reactions of gas phase ions; curation of comprehensive reference collections of ion properties; ion-molecule reactions; ion cyclotron resonance mass spectrometry.
POSITIONS HELD AT NBS/NIST:
Director, Ion Energetics Data Center 1979-1983
Group Leader, Ionizing Radiation and Aqueous Kinetics 1983-1986
Program Manager, Physical Data, Standard Reference Data Program 1986-1987
Chief, Chemical Kinetics and Thermodynamics Division 1988-1996
Scientist Emeritus 1996
HONORS:
U.S. Department of Commerce Silver Medal 1978, Gold Medal 1985
MEMBERSHIPS:
American Society of Mass Spectrometry (ASMS), Board of Directors, Committee on Standards and Measurements, Fundamentals Interest Group
Editorial Board, “Molecular Structure and Energetics”, VCH Publishers
Executive Council, Joint Committee on Atomic and Molecular Physical Data
American Institute of Physics Subcommittee on Numerical Data Bases
Advisory Committee for the Clearinghouse for Digital Infrared Spectra
American Chemical Society, Analytical and Physical Chemistry Divisions
PUBLICATIONS:
More than 110 publications, including:
S.G. Lias, J.F. Liebman, R.D. Levin, Evaluated Gas Phase Basicities and Proton Affinities of Molecules, Heats of Formation of Protonated Molecules, Journal of Physical and Chemical Reference Data 13, 695-808 (1984)
S.G. Lias, J.E. Bartmess, J.F. Liebman, J.L. Holmes, R.D. Levin, W.G. Mallard, Gas-Phase Ion and Neutral Thermochemistry, Journal of Physical and Chemical Reference Data 17, Suppl. No.1 (1988)
E.P.L. Hunter, S.G. Lias, Evaluated Gas Phase Basicities and Proton Affinities of Molecules: an update, Journal of Physical and Chemical Reference Data 27, 413-656 (1998)
S.G. Lias, S.E. Stein, J.E. Bartmess, NIST Positive and Negative Ion Energetics, NIST Standard Reference Database 19A (1993)
S.G. Lias, P.J. Ausloos, Ion-Molecule Reactions: Their Role in Radiation Chemistry, American Chemical Society, Washington (1975
New pulsed cold neutron beam line for fundamental nuclear physics at LANSCE
No full textThe NPDGamma collaboration has completed the construction of a pulsed cold neutron beam line on flight path12 at the Los Alamos Neutron Science Center (LANSCE). We describe the new beam line and characteristics of the beam. We report results of the moderator brightness and the guide performance measurements. FP12 has the highest pulsed cold neutron intensity for nuclear physics in the world
The GOES time code service, 1974-2004: A retrospective
No full textNIST ended its Geostationary Operational Environmental Satellites ( GOES) time code service at 0 hours, 0 minutes Coordinated Universal Time (UTC) on January 1, 2005. To commemorate the end of this historically significant service, this article provides a retrospective look at the GOES service and the important role it played in the history of satellite timekeeping