V. Tretyak - Rare alpha and beta decays

by Vladimir I. Tretyak (Institute for Nuclear Research Kyiv)

Thursday 27 Nov 2014, 14:30 → 16:00 Europe/Rome

E. Majorana lecture hall (LNGS)

Current status of experimental searches for rare alpha and beta decays is reviewed. Several interesting observations of alpha and beta decays, previously unseen due to big half lives in the range of 10¹⁵ – 10²⁰ yr, have been achieved during last years thanks to improvements in experimental techniques and underground location of experiments that allows to suppress backgrounds. In particular, the list includes first observations of alpha decays of ¹⁵¹Eu, ¹⁸⁰W (both to the ground state of daughter nuclei), ¹⁹⁰Pt (to excited daughter state), ²⁰⁹Bi (to the ground and excited daughter states). Isotope ²⁰⁹Bi has the longest known half life of T_1/2 ~ 10¹⁹ yr. Beta decay of ¹¹⁵In to the first excited state of ¹¹⁵Sn (E_exc=497.334 keV), recently observed at the first time, has the Q value of only 155±24 eV, which is the lowest Q value known to-date. Searches and investigations of other rare a and b decays (⁴⁸Ca, ⁵⁰V, ⁹⁶Zr, ¹¹³Cd, ¹²³Te, ^178m2Hf, ^180mTa) are also discussed.
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Vladimir I. Tretyak
Institute for Nuclear Research
Kyiv, Ukraine

Poster LNGS_Seminar2014Tretyak.pdf

Slides Tretyak2014.pdf