Search for heavy neutrinos in the β-spectrum of 63Ni
Physik-Institut der Universität Zürich, CH-8057 Zürich, SwitzerlandPhysics Letters B 01/1999; DOI:10.1016/S0370-2693(99)00200-2
ABSTRACT The β-spectrum of 63Ni has been measured with high precision in order to search for effects of heavy neutrinos. For assumed neutrino masses in the range 4 to 30 keV, upper limits of 10−3 or less are reported for the mixing probability.
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ABSTRACT: Recent liquid scintillation (LS) measurements at the National Institute of Standards and Technology (NIST) and at the Laboratoire National Henri Becquerel (LNHB) on a standardized (63)Ni solution that has been tracked for nearly 40 years have resulted in several important findings: (i) a (63)Ni half-life value of 101.2 +/- 1.5 a has been determined with the present decay data. This value is consistent with a previous specific activity determination and with an earlier value from decay measurements; and it appears to be more satisfactory than a recent data evaluator's recommended value of 98.7 a. (ii) All solution standards of (63)Ni as disseminated by NIST for the past 38(+) years are internally consistent with past and recent standardizations. (iii) Primary LS standardizations of (63)Ni by the triple-to-double coincidence ratio (TDCR) method and by CIEMAT/NIST (3)H-standard efficiency tracing (CNET) appear to be comparable, although the latter methodology is believed to be inherently inferior. (iv) There is excellent measurement agreement between NIST and LNHB for (63)Ni primary standardizations.Applied Radiation and Isotopes 02/2008; 66(1):60-8. · 1.18 Impact Factor
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