C. M. Edwards

Los Alamos National Laboratory

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N. S. Sullivan

University of Florida

Dawei Zhou

Qilu Hospital of Shandong University

D. Dehnhard

University of Minnesota

M. Palarczyk

Forschungszentrum Jülich

B. Brinkmöller

University of Minnesota

J. L. Langenbrunner

University of Minnesota

Michelle Espy

Los Alamos National Laboratory

D. S. Carman

Thomas Jefferson National Accelerator Facility

L. C. Bland

Brookhaven National Laboratory

J. W. Watson

Kent State University

Cooperative Institutions

Los Alamos National Laboratory

University of Minnesota

New Mexico State University

TRIUMF

Ohio University

University of Colorado Boulder

Indiana University Bloomington

The University of Texas at Austin

Thomas Jefferson National Accelerator Facility

University of Pennsylvania

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Quantum Diffusion of HD Impurities in Solid Hydrogen

Physica Scripta (1987)

C. M. Edwards N. S. Sullivan Dawei Zhou

The NMR linewidth of HD impurities in solid para hydrogen has been measured to be less than the rigid lattice value. Motion due to quantum diffusion, similar to the exchange of atoms in dense hcp 3He, of the HD molecules is believed to be the cause of the narrowing of the linewidth. This motion is severely restricted for ortho-H2 because of their quadrupole-quadrupole interactions with ortho neighbors. Pulsed NMR experiments designed to measure the motional effects on NMR spin echos are discussed. Pressure and temperature effects on the HD motion are also examined.

Laser linewidth

Motional narrowing

Solid hydrogen

10.1088/0031-8949/1987/t19b/022

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Citations (5)

Multistage separator column for ortho-hydrogen and para-deuterium production

Cryogenics (1993)

N. S. Sullivan C. M. Edwards M. Rall Dawei Zhou

Separator (oil production)

10.1016/0011-2275(93)90233-e

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Citations (2)

Elastic π+ scattering on polarized 3He

AIP conference proceedings (1995)

Michelle Espy S. Blanchard J. E. Brash B. Brinkmöller G. R. Burleson

Asymmetries, Ay, for π+ elastic scattering from polarized 3He were measured in the P33 resonance region, where the π‐nucleon force is strongly energy and isospin dependent. Preliminary results at energies of 142 and 180 MeV show large positive Ay near 90°, shifted to larger angles than predicted. At angles near 50° there is evidence for negative asymmetries of about −0.2 in contrast to several theoretical predictions that use up‐to‐date Faddeev wave functions and a first‐order optical potential. Inclusion of a Δ‐neutron spin‐spin interaction gives an excellent fit to the data at 180 MeV.

10.1063/1.48671

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The proton nuclear transverse relaxation time T2 measurement of HD and ortho- H2 impurities in bulk para-H2 near the melting temperature.

APS (2003)

Dawei Zhou C. M. Edwards N. S. Sullivan

Source

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Study of the 3,4He(p[downward right arrow],n) reactions at Tp=100 and 200 MeV

AIP conference proceedings (1995)

C. M. Edwards M. Palarczyk L. C. Bland B. D. Anderson B. Brinkmöller

We report on the measurement of differential cross sections and analyzing powers for the inclusive 3,4He(p↘,n) reactions at incident proton energies of Tp=100 and 200 MeV. The data are compared to predictions using several different models.

10.1063/1.48677

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Comparison of local ordering of orthohydrogen molecules above and below the percolation threshold in solid ortho-para mixtures

Solid State Communications (1986)

Dawei Zhou C. M. Edwards N. S. Sullivan

Percolation (cognitive psychology)

Percolation Theory

Local structure

10.1016/0038-1098(86)90382-0

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Citations (5)

Quantum diffusion of vacancies and impurities in solid hydrogen

Physical Review Letters (1989)

Dawei Zhou C. M. Edwards N. S. Sullivan

The proton nuclear transverse relaxation ${T}_{2}$ of HD impurities and ortho-${\mathrm{H}}_{2}$ impurities in solid parahydrogen is observed to be essentially temperature independent below 8 K, passes through a minimum near 9.2 K on warming, and then increases exponentially on approaching the melting point. The low-temperature values of ${T}_{2}$ are pressure dependent and a factor of 5.4 larger than the rigid lattice values. This ``line narrowing'' is attributed to quantum tunneling of the HD impurities at low temperatures. The minimum in ${T}_{2}$ is attributed to the breakup of coherent tunneling due to scattering by phonons and vacancies.

Solid hydrogen

Lattice (music)

10.1103/physrevlett.62.1528

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Citations (41)

Carbon resistance thermometers and variable-range hopping

Cryogenics (1986)

N. S. Sullivan C. M. Edwards

Variable-range hopping

Resistance thermometer

10.1016/s0011-2275(86)80001-7

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Citations (12)

Quasifree pion scattering at 500 MeV

Physical Review C (1993)

J. E. Wise M. R. Braunstein S. Høibråten M. D. Kohler B. J. Kriss

Non-charge-exchange inclusive cross sections have been measured at 500 MeV incident pion energy at quasifree scattering kinematics for both positive and negative pion charges. Peaks identified with quasifree knockout are seen at momentum transfers from 314 to 724 MeV/c. The widths and sizes of the peaks seen are consistent with the knockout of single nucleons from the nuclear surface. The data are consistent with no softening of the pion quasifree response at high momentum transfer, in contrast to the result seen in 500-MeV pion charge exchange data.

Momentum transfer

Momentum (technical analysis)

Charge exchange

10.1103/physrevc.48.1840

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Citations (18)

Local ordering in dilute ortho-para-hydrogen mixtures at low temperatures

Journal of Low Temperature Physics (1988)

C. M. Edwards Dawei Zhou Yue Lin N. S. Sullivan

Solid hydrogen

Discontinuity (linguistics)

Atmospheric temperature range

10.1007/bf00681725

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Citations (13)