Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..238..774d&link_type=abstract
Capture gamma-ray spectroscopy. AIP Conference Proceedings, Volume 238, pp. 774-786 (1991).
Astronomy and Astrophysics
Astrophysics
Protons And Neutrons
Scientific paper
The availability of an accurate value for τn has important implications for tests of the standard V-A theory of semi-leptonic weak processes, cosmology, and astrophysics. The lack of agreement between values of gA/gV derived from recent lifetime measurements and values obtained from recent β-decay asymmetry experiments hints at a problem with the current theoretical framework. In this neutron beam measurement the lifetime is determined by counting decay protons stored in a Penning trap whose magnetic axis coincides with the neutron beam axis. The recent result, τn=893.6+/-5.3 s, is based upon data accumulated during one reactor cycle at the Institut Laue-Langevin in Grenoble, France. In the next two years a final accuracy approaching 1 s will be sought. This improvement will be a consequence of long periods of running time available at NIST, several improvements to the apparatus, and an aggressive program aimed at development and intercomparison of advanced methods for the absolute determination of thermal and cold neutron fluxes.
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