Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2005-09-14
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 2 figures
Scientific paper
10.1016/j.physb.2006.05.187
The neutron is electrically neutral, but its substructure consists of charged quarks so it may have an internal charge distribution. In fact it is known to have a negative mean square charge radius (MSCR), the second moment of the radial charge density. In other words the neutron has a positive core and negative skin. In the first Born approximation the neutron MSCR can be simply related to the neutron-electron scattering length b_ne. In the past this important quantity has been extracted from the energy dependence of the total transmission cross-section of neutrons on high-Z targets, a very difficult and complicated process. A few years ago S.A. Werner proposed a novel approach to measuring b_ne from the neutron's dynamical phase shift in a perfect crystal close to the Bragg condition. We are conducting an experiment based on this method at the NIST neutron interferometer which may lead to a five-fold improvement in precision of b_ne and hence the neutron MSCR.
Arif Md.
Black T. C.
Huber Marcus
Jacobson Leif D.
Kaiser Hartmut
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