1,767 research outputs found
Neutron--Antineutron Oscillations at the Surface of Nuclei
We discuss some aspects of possible neutron--antineutron oscillations in
nuclei. The phenomenon occurs mostly at the surface of nuclei, and hence {\sl
i)} is not very sensitive to medium corrections and {\sl ii)} makes use of the
antinucleon-nucleus interaction in a region probed by experiments at CERN.Comment: Contr. Oak Ridge Workshop on Workshop on Baryon Instability, Latex, 4
pages, comments to [email protected]
Double and the Interaction
The - effective interaction, in the channel , in the
nuclear medium is fitted to the available binding energies,
, of double hypernuclei:
He, Be and
B. The mesonic decay of these hypernuclei is also
investigated. Finally, this effective interaction is used to predict the
binding energies and mesonic decays widths of heavier double
hypernuclei.Comment: 4 pages, (latex file, postscript-file and 3 Postscript-figures
included
Patient Outcomes Significantly Improve When Receiving Treatment by Athletic Therapy Students
Student-run clinics are beneficial and provide interactions between education and community. Treatment outcomes by students are rarely measured. To our knowledge, no studies evaluate student athletic therapistâs rehabilitation outcomes. The purpose of our study was to measure the improvement in function in injured patients seeking treatment at the student-run Athletic Therapy PERFORM Clinic. Main Outcomes and Measures: At baseline and at follow-up, student-treated patients completed one of three questionnaires to assess their injured level of function: Oswestry Disability Index (ODI) for low back injuries, Lower Extremity Functional Scale (LEFS) for lower extremity injuries and Disabilities of the Arm Shoulder and Hand (DASH) for upper extremity injuries. Results: On average, patients received 4.7 ± 1.8 treatments across 48.8 ± 16.1 days. Overall, patients experienced a statistically significant increase in function between assessment and follow-up (18.8% ± 20.3, p < 0.001). Patients with an acute injury improved more compared to patients with a chronic pain injury (p < 0.001). While there was no significant difference in function at baseline between patients with acute injuries and chronic pain/injuries, there was a trend towards patients with an acute injury being less functional (p = 0.051). Discussion: Improvements in function in injured patients at this student-run clinic are similar to the minimal clinically important difference respective to each questionnaire. The clinic offers an additional benefit to patients with a robust cost-effectiveness ratio. Our results suggest that Athletic Therapy education should investigate the different needs of chronic injury patients in order to maximize improvements in function
Widths of Hypernuclear States
The and neutron decay widths of hypernuclear states, based on
calculated \Xi N \to \lala mixing amplitudes, are estimated. The widths which
result from using the Nijmegen Model D interaction are sufficiently small, of
order 1.5 MeV, that experiments to observe hypernuclear states using the
reaction may be feasible.Comment: 20 pages, LaTex with one postscript figure in accompanying file, to
appear in Progress of Theoretical Physics Supplement No. 11
Limits on \boldmath n {\bar n} oscillations from nuclear stability
The relationship between the lower limit on the nuclear stability lifetime as
derived from the non disappearance of `stable` nuclei
( yr), and the lower limit thus implied on
the oscillation time of a possibly underlying
neutron-antineutron oscillation process, is clarified by studying the time
evolution of the nuclear decay within a simple model which respects unitarity.
The order-of-magnitude result sec, where is a typical
nuclear annihilation width, agrees as expected with the limit on established by several detailed nuclear physics calculations, but sharply
disagreeing by 15 orders of magnitude with a claim published recently in Phys.
Rev. CRAP.Comment: 8 pages; this PRC version (accepted for publication, November 4 1999)
differs from the original version only by a few minor editorial change
Chiral SU(3) Symmetry and Strangeness
In this talk we review recent progress on the systematic evaluation of the
kaon and antikaon spectral functions in dense nuclear matter based on a chiral
SU(3) description of the low-energy pion-, kaon- and antikaon-nucleon
scattering data.Comment: 9 pages, 4 figures, invited talk given by M.F.M.L. at the SQM2001
conferenc
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Quasinuclear N N states
We present an interpretation of recent experimental results on nucleon-anti-nucleon annihilation reactions of the type N{bar N} {yields} {pi}X, which have yielded evidence for a new tensor meson AX (here called X{sub 2}) with J{pi}{sup C}(I{sup G}) = 2{sup ++}(0{sup +}). The branching ratios for producing X{sub 2} from N{bar N} atomic states of orbital angular momentum L = 0,1, as well as its preference for decay into {rho}{rho} and {pi}{pi} rather than K{bar K} channels, are consistent with the identifications of X{sub 2} as a {sup 13}P{sub 2}{minus}{sup 13}F{sub 2} bound state of the N{bar N} potential. We suggest further key test of this interpretation. 21 refs
On the flow of kaons produced in relativistic heavy ion collisions
We investigate the different contributions to the in-plane flow of K+ mesons
observed recently by the FOPI collaboration in the reaction Ni(1.93 AGeV)+Ni.
Due to the kinematics of the three body phase space decay the flow of kaons
produced in baryon-baryon interactions is smaller than that of the baryons in
the entrance channel. On the contrary, in pi N interactions the flow of the
sources and of the kaons are identical. Therefore the total kaon flow depends
on the relative number of Delta N -> K+ and pi N -> K+ reactions and hence on
the lifetime of the Delta, in addition to the already known dependence on the
potential interaction interaction of the kaons with the nuclear environment.Comment: 11 pages, 10 figures, submitted to NP
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