scholarly journals A {sup 2}H(n,p)2n experiment to measure accurately the neutron-neutron scattering length. Final report for reporting period May 1, 1995 - October 31, 1998

1999 ◽  
Author(s):  
Caesar R Jackson
Keyword(s):  
Neutron Scattering ◽  
Scattering Length ◽  
Final Report

scholarly journals Precision neutron-interferometric measurement of the coherent neutron-scattering length in silicon

1998 ◽  
Vol 58 (2) ◽  
pp. 1475-1479 ◽  
Author(s):  
A. Ioffe ◽  
D. L. Jacobson ◽  
M. Arif ◽  
M. Vrana ◽  
S. A. Werner ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Scattering Length ◽  
Interferometric Measurement

A new attempt to determine the neutron–neutron scattering length using the 2H(n,np)n reaction

2001 ◽  
Vol 684 (1-4) ◽  
pp. 632-634 ◽  
Author(s):  
V. Huhn ◽  
L. Wätzold ◽  
Ch. Weber ◽  
A. Siepe ◽  
W. von Witsch ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Scattering Length

The neutron-neutron scattering length from reactions with tritium targets

1968 ◽  
Vol 109 (2) ◽  
pp. 465-470 ◽  
Author(s):  
E. Fuschini ◽  
C. Maroni ◽  
I. Massa ◽  
A. Uguzzoni ◽  
G. Vannini ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Scattering Length

scholarly journals Determination of the Neutron-Neutron Scattering Length from the ReactionT(d, He3)2n

1966 ◽  
Vol 16 (3) ◽  
pp. 105-108 ◽  
Author(s):  
E. Baumgartner ◽  
H. E. Conzett ◽  
E. Shield ◽  
R. J. Slobodrian
Keyword(s):  
Neutron Scattering ◽  
Scattering Length

scholarly journals A search for deviations from the inverse square law of gravity at nm range using a pulsed neutron beam

2019 ◽  
Vol 219 ◽  
pp. 05002
Author(s):  
Christopher Haddock ◽  
Katsuya Hirota ◽  
Takashi Ino ◽  
Masaaki Kitaguchi ◽  
Kenji Mishima ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Cross Sections ◽  
Noble Gases ◽  
Scattering Length ◽  
Slow Neutron ◽  
Inverse Square Law ◽  
Scattering Cross ◽  
Law Of Gravity ◽  
Neutron Momentum ◽  
Scattering Cross Sections

Recently published results and ongoing experimental efforts to search for deviations from the inverse square law of gravity at the nanometer length scale using slow neutron scattering from the noble gases are discussed. Using the pulsed slow neutron beamline BL05 at the Materials and Life Sciences Facility at J-PARC, we measured the neutron momentum transfer (q) dependence of the differential scattering cross section for the noble gases He, Ne, Ar, Kr, and Xe. By comparing to the distributions obtained using pseudo-experimental Monte Carlo simulations and forming ratios between Xe and He, we placed an upper bound on the strength of a new interaction as a function of interaction length λ which improved upon previous results in the region λ < 0.1 nm, and remains competitive in the larger λ region. Additionally we describe how we are using our technique to extract relative values of the total neutron scattering cross sections of the noble gases, as well as how we plan to measure the neutron-electron scattering length using the NOVA instrument on BL21 at J-PARC.

scholarly journals Precision Measurement of the Neutron Scattering Length of He4 Using Neutron Interferometry

2020 ◽  
Vol 124 (1) ◽  
Author(s):  
R. Haun ◽  
F. E. Wietfeldt ◽  
M. Arif ◽  
M. G. Huber ◽  
T. C. Black ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Precision Measurement ◽  
Scattering Length ◽  
Neutron Interferometry

scholarly journals Small Angle Neutron Scattering from Nanophase Titanium As A Function of Oxidation

1988 ◽  
Vol 132 ◽  
Author(s):  
J. A. Eastman ◽  
J. E. Epperson ◽  
H. Hahn ◽  
T. E. Klippert ◽  
A. Narayanasamy ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Scattering Length ◽  
Contrast Variation ◽  
Gas Condensation ◽  
Pressure Oxygen ◽  
Scattering Centers ◽  
Scattering Lengths ◽  
Contrast Matching

ABSTRACTNanophase titanium, prepared by the gas-condensation method both as aggregated powder and in lightly compacted discs, has been studied by conventional small angle neutron scattering, and by use of contrast variation methods. The contrast has been changed (a), isotopically, by means of deuterated/protonated solvents distilled into the specimen and (b) by progressive incremental oxidation of the Ti particles using fixed doses of low-pressure oxygen. It was shown that some evolution of the small angle pattern for lightly compacted nanophase Ti occurred over a period of several months at 300 K. Contrast matching by external solvent works well and has allowed the scattering lengths of oxidized and unoxidized specimens to be followed. The results imply that the scattering from metal and oxide can be separated under suitable conditions. The partial oxidation experiments indicate that there is both a fast and slow oxidation at 300 K. Also, during slow oxidation, high scattering length density scattering centers were formed whose number increased, but whose size remained the same at about 2 nm; these centers are tentatively assumed to be TiO2.

scholarly journals Variation of Solvent Scattering-Length Density in Small-Angle Neutron Scattering as a Means of Determining Structure of Composite Materials

1994 ◽  
Vol 376 ◽  
Author(s):  
Rex P. Hjelm ◽  
Wesley Wampler ◽  
Michel Gerspacher
Keyword(s):  
Composite Materials ◽  
Carbon Black ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Scattering Length ◽  
Contrast Variation ◽  
Length Scales ◽  
Excluded Volume Effects ◽  
Component Form

ABSTRACTAs part of our work on the structure of composite materials we have been exploring the use of small-angle neutron scattering using the method of contrast variation to dissect the component form, structure and distribution. This approach has resulted in a new look at very old problemreinforcement of elastomers by carbon black.Using this approach we studied an experimental high surface area (HSA) carbon black and a gel of "HSA-bound" rubber in cyclohexane/deuterocyclohexane mixtures. HSA in cyclohexane is found to be short rodlike particle aggregates. The aggregates have a shell-core structure with a high density graphitic outer shell and an inner core of lower density amorphous carbon. The core is continuous throughout the carbon black aggregate, making the aggregate a stiff, integral unit. Contrast variation of swollen composite gels shows that there are two length scales in the gel structure. Above 10 Å, scattering from carbon black predominates, and below 10 Å the scattering is from both carbon black and the elastomer. The HSA in the composite is completely embedded in polyisoprene. An estimate of the carbon black structure factor shows strong exclusion of neighboring aggregates, probably from excluded volume effects. The surface structure of the carbon black is unaltered by the interactions with elastomer and appears smooth over length scales above about 10 Å. These results show that contrast variation can provide information on composite structure that is not available by other means. This information relates to the reinforcement mechanism of elastomers by carbon blacks.

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