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|Title:||The Smallest Known Q Value of Any Nuclear Decay: the Rare beta-minus Decay of 115In(9/2+) ->115Sn(3/2+)|
|Authors:||WIESLANDER E.; SUHONEN J.; ERONEN T.; HULT Mikael; ELOMAA V.-V.; JOKINEN A.; MARISSENS Gerd; MISIASZEK M.; MUSTONEN M.t.; RAHAMAN S.; WEBER C.; AEYSTOE J.|
|Citation:||PHYSICAL REVIEW LETTERS vol. 103 no. 12 p. 122501 (1-4)|
|Publisher:||AMER PHYSICAL SOC|
|Type:||Articles in Journals|
|Abstract:||The ground-state-to-ground-state Q-beta-minus value of 115In was determined to 497.68(17) keV using a high precision Penning trap facility at the University of Jyvaskyla, Finland. From this, a Q-beta-minus value of 0.35(17) keV is obtained for the rare beta-minus decay to the first excited state of 115Sn at 497.334(22) keV. The partial half-life was determined to 4.1(6)E20 yr using ultra low-background gamma-ray spectrometry in an underground laboratory. Theoretical modeling of this 2nd-forbidden unique beta-minus transition was also undertaken and resulted in Q-beta-minus = 57(+19-12)eV using the measured half-life. The discrepancy between theory and experiment could be attributed to atomic effects enhanced by the low Q value. The present study implies that this transition has the lowest Q value of any known nuclear beta decay.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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