ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Measurements ofn−p correlations in the reaction of relativistic neon with uranium (1986)

Frankel, K. ; Schimmerling, W. ; Rasmussen, J. O. ; [et al.]

Springer

The European physical journal 323 (1986), S. 391-398

add to mindlist on the mindlist

Details

ISSN: 1434-601X

Keywords: 25.70.Np

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We report a preliminary measurement of coincident neutron-proton pairs emitted at 45° in the interaction of 400, 530, and 650 MeV/A neon beams incident on uranium. Charged particles were identified by time of flight and momentum, as determined in a magnetic spectrometer. Neutral particles were detected using a thick plastic scintillator, and their time of flight was measured between an entrance scintillator, triggered by a charged particle, and the neutron detector. The scatter plots and contour plots of neutron momentum vs. proton momentum appear to show a slight correlation ridge above an uncorrelated background. The projections of this plane on then-p momentum difference axis are essentially flat, showing a one standard deviation enhancement for each of the three beams energies. At each beam energy, the calculated momentum correlation function for the neutron-proton pairs is enhanced near zero neutron-proton momentum difference by approximately one standard deviation over the expected value for no correlation. This enhancement is expected to occur as a consequence of the attractive final state interaction between the neutron and proton (i.e., virtual or “singlet” deuterons). The implications of these measurements are discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01313520

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Infrared attenuated total reflectance study of latex paint films exposed to aqueous sulfur dioxide (1989)

Xu, J. R. ; Balik, C. M.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 38 (1989), S. 173-183

add to mindlist on the mindlist

Details

ISSN: 0021-8995

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Fourier-transform infrared/attenuated total reflectance (FTIR-ATR) has been used to investigate the effects of acidic deposition on latex paint films with and without a calcium carbonate extender additive. Paint films approximately 5 mils thick were exposed to aqueous SO2(pH 2.0) for various times by simple immersion. Rapid and complete removal of CaCO3 from the paint film was found to occur, and the kinetics of the removal process were monitored using both weight loss and FTIR-ATR measurements. Both methods revealed Fickian diffusion, with an apparent diffusion coefficient D = 1.84 × 10-9 cm2/s. Good agreement was obtained between D measured via FTIR-ATR and from the weight lost data. The mechanism of removal of CaCO3 from the latex paint films appears to be controlled by the rate at which water and other components of the aqueous SO2 solution can diffuse into the film.

Additional Material: 5 Ill.