Details

Autor(en) / Beteiligte

• Wieslander, J S E
• Suhonen, J
• Eronen, T
• Hult, M
• Elomaa, V-V
• Jokinen, A
• Marissens, G
• Misiaszek, M
• Mustonen, M T
• Rahaman, S
• Weber, C
• Aystö, J

Titel

Smallest known Q value of any nuclear decay: the rare beta;{-} decay of ;{115}In(9/2;{+}) --> ;{115}Sn(3/2;{+})

Ist Teil von

• Physical review letters, 2009-09, Vol.103 (12), p.122501-122501

Ort / Verlag

United States

Erscheinungsjahr

2009

Quelle

PROLA - Physical Review Online Archive

Beschreibungen/Notizen

• The ground-state-to-ground-state Q_{beta;{-}} value of ;{115}In was determined to 497.68(17) keV using a high-precision Penning trap facility at the University of Jyväskylä, Finland. From this, a Q_{beta;{-}} value of 0.35(17) keV was obtained for the rare beta;{-} decay to the first excited state of ;{115}Sn at 497.334(22) keV. The partial half-life was determined to 4.1(6) x 10;{20} yr using ultra low-background gamma-ray spectrometry in an underground laboratory. Theoretical modeling of this 2nd-forbidden unique beta;{-} transition was also undertaken and resulted in Q_{beta;{-}} = 57_{-12};{+19} 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.