By Hans Volker Klapdor-Kleingrothaus
Nuclear double beta decay is likely one of the such a lot promising instruments for probing beyond-the-standard-model physics on beyond-accelerator power scales. it truly is already now probing the TeV scale, on which new physics may still present itself in response to theoretical expectancies. purely within the early Eighties used to be it identified that double beta decay yields info at the Majorana mass of the exchanged neutrino. at the present, the sharpest certain for the electron neutrino mass arises from this strategy. it's only within the final 10 years that the even more far-reaching strength of double beta decay has been came upon. this present day, the opportunity of double beta decay features a wide diversity of subject matters which are both suitable to particle physics and astrophysics, corresponding to lots of heavy neutrinos, of sneutrinos, as SUSY versions, compositeness, leptoquarks, left-right symmetric versions, and exams of Lorentz symmetry and equivalence precept within the neutrino quarter. Double beta decay has develop into essential these days for fixing the matter of the neutrino mass spectrum and the constitution of the neutrino mass matrix — including current and destiny sun and atmospheric neutrino oscillation experiments. a few destiny double beta experiments (like GENIUS) can be able to be at the same time neutrino observatories for double beta decay and low-energy sun neutrinos, and observatories for chilly darkish topic of final sensitivity.This beneficial publication outlines the improvement of double beta examine from its beginnings till its most modern achievements, and likewise provides the outlook for its hugely fascinating destiny.
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Extra info for 60 Years of Double Beta Decay
N. Takaoka and G. Ogata used tellurium ores from the Oya gold mine in Japan, T. Kirsten et al. W. Hennecke et al. an ore from the Kalgoorlie mine in Australia, while T. Bernatowicz et al. investigated probes from various mines. 2 x 10m yr essentially confirming earlier results [Ber92*-I], [Ber93**-I], [Man91*-I]. These experiments, looking only for the daughter nucleus, naturally cannot differentiate between the neutrinoless and the two-neutrino decay processes. 2x10** years. Also the radiochemical investigation of 238U has been improved more recently (Tur91*-I|.
8 Deutsch-Sowjetisches Projekt zur Untersuchung der Neutrinomasse Gestartet, H. V. 10 Das Letzte Ratsel der Physik, [NEU90] A. 11 Neuer Vorstofi zur Bestimmung der Neutrinomasse, H. V. 12 Weitere Eingrenzung der Neutrinomasse iiber den Doppelten Beta-Zerfall, H. V. 13 Unique Crystal 'Grown' in OR Could Play Role in Basic Physics, J. A. 15 Suchaktion im Tunnel, H. V. 16 New Experiments Step Up Hunt for Neutrino Mass, D. 17 Status and Perspectives of Double Beta Decay — Window to New Physics Beyond the Standard Model of Particle Physics, H.
C. Whitten, [Pri59**-I], [Gre60**-I], see also [Pri81**-I]. Some Prom the Early Days until the Gauge Theory Era Fig. 20 Boris Kayser (left), with the author and Pran Nath (right) at the BEYOND'97 Conference, Castle Ringberg, Germany, 1997, (foto author). 15 of the approximations of pregauge theorie have been investigated by J. Vergados [Ver81**-I]. For the half-life of the two-neutrino mode we refer to [Gro83a*-II], [Kla84*II], [Doi85**-I], for a derivation see [Gro89/90**-I]. The experimental study of the two-neutrino mode which is the rarest process observed so far in nature, is important for understanding nuclear structure problems in their own right, and in calculating the nuclear matrix elements for the neutrinoless mode in eq.