Abstract
We report a determination of the scattering length difference fm between the triplet and singlet states using a neutron interferometer. This revises our previous result fm obtained using the same technique in 2008 [Huber et al., Phys. Rev. Lett. 102, 200401 (2009); Huber et al., Phys. Rev. Lett. 103, 179903(E) (2009)]. This revision is attributable to a reanalysis of the 2008 experiment that now includes a systematic correction caused by magnetic-field gradients near the cell which had been previously underestimated. Furthermore, we more than doubled our original data set from 2008 by acquiring 6 months of additional data in 2013. Both the new data set and a reanalysis of the older data are in good agreement. Scattering lengths of low- isotopes are valued for use in few-body nuclear effective field theories, provide important tests of modern nuclear potential models, and, in the case of , aid in the interpretation of neutron scattering from quantum liquids. The difference was determined by measuring the relative phase shift between two incident neutron polarizations caused by the spin-dependent interaction with a polarized target. The target gas was sealed inside a small, flat-windowed glass cell that was placed in one beam path of the interferometer. The relaxation of polarization was monitored continuously with neutron transmission measurements. The neutron polarization and spin-flipper efficiency were determined separately using analyzers and two different polarimetry analysis methods. A summary of the measured scattering lengths for with a comparison to nucleon interaction models is given.
6 More- Received 4 September 2014
- Revised 12 November 2014
DOI:https://doi.org/10.1103/PhysRevC.90.064004
©2014 American Physical Society