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Tests of the standard model from superallowed Fermi β-decay studies: The 74Rb β-decay.
- Source :
- European Physical Journal A -- Hadrons & Nuclei; Sep2002, Vol. 15 Issue 1/2, p229-232, 4p
- Publication Year :
- 2002
-
Abstract
- Precise measurements of the intensities of superallowed Fermi 0<superscript>+</superscript> → 0<superscript>+</superscript>β-decays have provided a powerful test of the CVC hypothesis at the level of 3×10<superscript>-4</superscript> and also led to a result in disagreement with unitarity for the CKM matrix at the 98% confidence level. It is essential to address possible trivial explanations for the apparent non-unitarity such as uncertainties in the isospin symmetry-breaking corrections. We have carefully studied the <superscript>74</superscript>Rb →<superscript>74</superscript>Kr β-decay in order to measure the non-analog β-decay branching to the 0<superscript>+</superscript> state at 508 keV in <superscript>74</superscript>Kr. We have determined that this branching is < 3×10<superscript>-4</superscript>, far smaller than any published theoretical estimate. We also show that high-precision, complete spectroscopy, measuring the major β-branches to excited 0<superscript>+</superscript> and 1<superscript>+</superscript> states, must be performed if one is to obtain a meaningful branching ratio to the excited 0<superscript>+</superscript> state and concomitantly deal, in a substantial way, with the possibility of β feeding to an array of 1<superscript>+</superscript> states. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14346001
- Volume :
- 15
- Issue :
- 1/2
- Database :
- Complementary Index
- Journal :
- European Physical Journal A -- Hadrons & Nuclei
- Publication Type :
- Academic Journal
- Accession number :
- 50909627
- Full Text :
- https://doi.org/10.1140/epja/i2001-10259-y