9 research outputs found
Backward Elastic p3He Scattering at Energies 1 - 2 GeV
The two-body transfer amplitude for the rearrangement process i+(jkl) -
j+(ikl) is constructed on the basis of technique of 4-dimensional covariant
nonrelativistic graphs. The developed formalism is applied to describing
backward elastic scattering in the energy range 0.5 - 1.7 GeV.
Numerical calculations performed using the 5- channel wave function of the
nucleus show that the transfer of a noninteracting np- pair dominates
and explains satisfactorily the energy and angular dependence of the
differential cross section at energies 0.9 - 1.7~^3He$ wave function
in spite of large momentum transfer as well as a very important role of
rescatterings in the initial and final states are established.Comment: 7 pages, Latex, 3 Postscript figure
He Structure and Mechanisms of He Backward Elastic Scattering
The mechanism of He backward elastic scattering is studied.
It is found that the triangle diagrams with the subprocesses He,
He and He, where and
denote the singlet deuteron and diproton pair in the state,
respectively, dominate in the cross section at 0.3-0.8 GeV, and their
contribution is comparable with that for a sequential transfer of a pair
at 1-1.5 GeV.
The contribution of the , estimated on the basis of the spectator
mechanism of the He reaction, increases the HeHe cross section by one order of magnitude as compared to the
contribution of the deuteron alone.
Effects of the initial and final states interaction are taken into account.Comment: 17 pages, Latex, 4 postscript figures, expanded version, accepted by
Physical Review
n p pair transfer mechanism for backward elastic p He-3 scattering at intermediate-energies
Case series of severe neurologic sequelae of ebola virus disease during epidemic, Sierra Leone
We describe a case series of 35 Ebola virus disease (EVD) survivors during the epidemic in West Africa who had neurologic and accompanying psychiatric sequelae. Survivors meeting neurologic criteria were invited from a cohort of 361 EVD survivors to attend a preliminary clinic. Those whose severe neurologic features were documented in the preliminary clinic were referred for specialist neurologic evaluation, ophthalmologic examination, and psychiatric assessment. Of 35 survivors with neurologic sequelae, 13 had migraine headache, 2 stroke, 2 peripheral sensory neuropathy, and 2 peripheral nerve lesions. Of brain computed tomography scans of 17 patients, 3 showed cerebral and/or cerebellar atrophy and 2 confirmed strokes. Sixteen patients required mental health follow-up; psychiatric disorders were diagnosed in 5. The 10 patients who experienced greatest disability had co-existing physical and mental health conditions. EVD survivors may have ongoing central and peripheral nervous system disorders, including previously unrecognized migraine headaches and stroke