Precision Measurements of the n-H, n-D, and n-3He Coherent Scattering Lengths

Details Precision Measurements of the n-H, n-D, and n-3He Coherent Scattering Lengths Precision Measurements of the n-H, n-D, and n-3He Coherent Scattering Lengths

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apri13008s&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Theoretical calculations of the properties of few-nucleon systems starting from the nucleon-nucleon (NN) interaction potential have been improved qualitatively over the last few years. The issue of the nature and origin of three- and four-nucleon (3N and 4N) forces in particular has received special attention. The triton binding energy and the doublet n-D scattering length are the two zero-energy observables for which calculations of the effects of 3N forces are uncomplicated by Coulomb corrections. Since the quartet n-D scattering length is mainly due to the long-range part of the NN interaction and is therefore determined essentially by the properties of the deuteron, a precision measurement of the coherent n-D scattering length (which is a linear combination of the doublet and quartet lengths) can be used to gain information on the n-D doublet scattering length. In measuring n-H and n-3He scattering lengths, one can theoretically extract n-n and n-p interactions, which can then be used to examine the residual few-nucleon forces and deviations from theory. We will present new measurements of the n-D, n-H, and n-3He coherent scattering lengths using the NIST neutron interferometer facility with comparable sensitivity for n-D and n-H and almost an order-of-magnitude improvement in sensitivity for n-3He, relative to existing measurements.

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