Improvements in the experimental and theoretical input to evaluation of the phase-space factor for beta-decay of the free neutron prompt its re-evaluation after an interval of 16 years. We find: f= 1.68857 ± 0.00008 and fR= 1.71517 ± 0.00009 without and with outer radiative correction, respectively. © 1998 Elsevier Science B.V. All rights reserved.
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