In the past year we have completed measurements of polarized neutron–polarized He scattering in the few MeV region. Measurements of the total cross-section differences ∆σT and ∆σL have been obtained for neutrons with incident energies 1-10 MeV. The results are sensitive to the excited state structure of the alpha particle and may be compared to phase-shift predictions based on a number of analy...

An integrated polarized light guide was designed and fabricated for use as a liquid-crystal backlight with emphasis on uniformity of the light and conversion of p-polarized to s-polarized light. Two different micro-optical structures were fabricated both on the top and the bottom surfaces of the light guide. On the top surface, a subwavelength grating separates s-polarized and p-polarized light...

3He atoms dissolved in superfluid 4He may form dimers (He)2 in two-dimensional (2D) geometries. We study dimer formation in films of dilute 3He–4He mixture. After designing a schematic 3He–3He interaction potential we calculate the dimer binding energy for various substrates. It is shown that 3He impurity states localized near the substrate give rise to the largest magnitudes of the binding ene...

M.W. Ahmed, C.W. Arnold, T. Averett, J.P Chen J.R. Calarco, T. Clegg, D. Dutta, H. Gao (Spokesperson), C. Howell, M. Huang,H. Karwowski, G. Laskaris, A. Nathan, X. Qian, H.R. Weller, Y. Wu, Q. Ye, Q.J. Ye, A. Young, W.Z. Zheng Duke University 2 University of North Carolina, Chapel Hill College of William & Mary Thomas Jefferson Lab National Accelerator Facility, Newport News, VA 5 University of...

K. Matsumoto,* J. V. Porto, L. Pollack, E. N. Smith, T. L. Ho, and J. M. Parpia Laboratory of Atomic & Solid State Physics and Materials Science Center, Cornell University, Ithaca, New York 14853 (Received 14 January 1997) We present evidence for a nonzero pressure, T ­ 0 superfluid phase transition of 3He in 98.2% open aerogel. Unlike bulk 3He which is a superfluid at T ­ 0 at all pressures (d...

Ionizing radiation increases the nuclear spin relaxation in the target chamber. Also known as “beam depolarization,” it is essentially a two step process. First, the beam ionizes an 3He atom which results in an free electron and an atomic ion 3He+. There is also the possibility that the atomic ion bonds with an neutral 3He atom to form an molecular ion He2 . Second, interactions with 3He ions i...

Fermionic Molecular Dynamics (FMD) is a microscopic many-body approach which has been used successfully to study the structure of light nuclei in the pand sd-shell. FMD uses a Gaussian wave packet basis which contains the harmonic oscillator shell model and Brink-type cluster model wave functions as limiting cases. A realistic effective interaction that has been derived from the Argonne V18 int...