Q Values of the Superallowed {beta} Emitters {sup 26}Al{sup m}, {sup 42}Sc, and {sup 46}V and Their Impact on V{sub ud} and the Unitarity of the Cabibbo-Kobayashi-Maskawa Matrix

Journal Article · Fri Dec 08 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.232501· OSTI ID:20861450

Eronen, T; Elomaa, V; Hager, U; Hakala, J; Jokinen, A; Kankainen, A; Moore, I; Penttilae, H; Rahaman, S; Rissanen, J; Saastamoinen, A; Sonoda, T; Aeystoe, J; Hardy, J C; Kolhinen, V S ^[1]

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1. Department of Physics, University of Jyvaeskylae, P.O. Box 35 (YFL), FIN-40014 (Finland)

The {beta}-decay Q{sub EC} values of the superallowed beta emitters {sup 26}Al{sup m}, {sup 42}Sc, and {sup 46}V have been measured with a Penning trap to a relative precision of better than 8x10{sup -9}. Our result for {sup 46}V, 7052.72(31) keV, confirms a recent measurement that differed from the previously accepted reaction-based Q{sub EC} value. However, our results for {sup 26}Al{sup m} and {sup 42}Sc, 4232.83(13) keV and 6426.13(21) keV, are consistent with previous reaction-based values. By eliminating the possibility of a systematic difference between the two techniques, this result demonstrates that no significant shift in the deduced value of V{sub ud} should be anticipated.

• OSTI ID: 20861450
• Journal Information: Physical Review Letters, Vol. 97, Issue 23; Other Information: DOI: 10.1103/PhysRevLett.97.232501; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 26
BETA DECAY
CABIBBO ANGLE
KOBAYASHI-MASKAWA MATRIX
MEV RANGE 01-10
SCANDIUM 42
UNITARITY
VANADIUM 46