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SUMMARY:High Precision Q_EC Value Measurements of Superallowed beta decays
DTSTART;VALUE=DATE-TIME:20110221T163000Z
DTEND;VALUE=DATE-TIME:20110221T171000Z
DTSTAMP;VALUE=DATE-TIME:20260716T020823Z
UID:indico-contribution-6166@indico.ific.uv.es
DESCRIPTION:Speakers: Tommi Eronen (University of Jyväskylä)\nPrecise me
 asurements of beta decays between isobaric analog states of nuclear spin-p
 arity 0+ and isospin T=1 provide important data for testing the electrowea
 k interaction. These so-called superallowed beta decays provide the most p
 recise value of V_ud\, the up-down element of the Cabibbo-Kobayashi-Maskaw
 a (CKM) quark-mixing matrix. The most stringent test of the CKM matrix is 
 the top-row unitarity test\, where V_ud contributes the most. Currently th
 ere are 13 superallowed transitions ranging from 10C to 74Rb that are dete
 rmined accurately enough to contribute to the world average.\n\nThe three 
 experimental quantities that are required to extract V_ud from a superallo
 wed decay are the branching ratio (BR) of the superallowed 0+ to 0+ transi
 tion\, the half-life (T_1/2) of the parent state and the decay energy (Q_E
 C). Additionally\, a few theoretical correction terms are needed.\n\nThe J
 YFLTRAP Penning-trap setup at the University of Jyväskylä\, Finland\, ha
 s contributed to these studies mainly with high-precision Q-values. Since 
 2006\, Q values of 15 different superallowed transitions\, ranging from 10
 C to 62Ga\, have been determined with high precision. Since JYFLTRAP is co
 upled to the IGISOL mass separator\, any element is available. Simultaneus
  production enabled us to determine a Q_EC value by measuring the frequenc
 y ratio of the parent and daughter ions directly. Using this so-called dou
 blet technique and utilizing state-of-the art methods\, such as ion-motion
  excitation with time-separated oscillatory fields\, we have reached preci
 sions down to the 50-eV level.\n\nIn this contribution\, the results and i
 mpact of the Q-value measurement program at JYFLTRAP will be presented.\n\
 nhttps://indico.ific.uv.es/event/349/contributions/6166/
LOCATION:Colegio Rector Peset
URL:https://indico.ific.uv.es/event/349/contributions/6166/
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