Q values of the superallowed beta emitters 26Alm, 42Sc, and 46V and their impact on Vud and the unitarity of the Cabibbo-Kobayashi-Maskawa matrix.
The beta-decay Q(EC) values of the superallowed beta emitters 26Alm, 42Sc, and 46V have been measured with a Penning trap to a relative precision of better than 8 x 10(-9). Our result for 46V, 7052.72(31) keV, confirms a recent measurement that differed from the previously accepted reaction-based Q(EC) value. However, our results for 26Alm and 42Sc, 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 Vud should be anticipated.
Eronen
T
T
Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL), FIN-40014, Finland. tommi.eronen@phys.jyu.fi
Elomaa
V
V
Hager
U
U
Hakala
J
J
Jokinen
A
A
Kankainen
A
A
Moore
I
I
Penttilä
H
H
Rahaman
S
S
Rissanen
J
J
Saastamoinen
A
A
Sonoda
T
T
Aystö
J
J
Hardy
J C
JC
Kolhinen
V S
VS