CFA Lectures

V. Tretyak - Rare alpha and beta decays

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

Europe/Rome
E. Majorana lecture hall (LNGS)

E. Majorana lecture hall

LNGS

Description

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 T1/2 ~ 1019 yr. Beta decay of 115In to the first excited state of 115Sn (Eexc=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.
---------------------------------
Vladimir I. Tretyak
Institute for Nuclear Research
Kyiv, Ukraine

Poster
Slides