By Hans Volker Klapdor-Kleingrothaus

ISBN-10: 9810237790

ISBN-13: 9789810237790

ISBN-10: 9812811923

ISBN-13: 9789812811929

Nuclear double beta decay is among the so much promising instruments for probing beyond-the-standard-model physics on beyond-accelerator strength scales. it truly is already now probing the TeV scale, on which new physics may still present itself based on theoretical expectancies. in basic terms within the early Nineteen Eighties was once it identified that double beta decay yields details at the Majorana mass of the exchanged neutrino. at the present, the sharpest certain for the electron neutrino mass arises from this strategy. it is just within the final 10 years that the even more far-reaching strength of double beta decay has been found. at the present time, the possibility of double beta decay incorporates a extensive variety of subject matters which are both proper to particle physics and astrophysics, reminiscent of plenty of heavy neutrinos, of sneutrinos, as SUSY types, compositeness, leptoquarks, left-right symmetric types, and exams of Lorentz symmetry and equivalence precept within the neutrino quarter. Double beta decay has develop into fundamental 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) should 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 booklet outlines the advance of double beta learn from its beginnings until eventually its most up-to-date achievements, and in addition provides the outlook for its hugely intriguing destiny.

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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. 4). Already by [Doi81a*-I] a systematic study was made of the 0 + —• J+ 00 transitions for the two-neutrino and the neutrinoless modes.

Haxton et al. [Hax82a*-I] basing on the B. Pontecorvo assumption [Pon68], that the matrix elements of similar nuclei (as 1 2 8 Te and 130 Te) should be equal, also assuming a vanishing right-handed contribution, yielded a value of 10 eV. Already earlier H. P. Rosen [Pri69*-I] had analyzed this ratio taken from earlier measurements by N. Takaoka and G. Ogata [Tak66**-I] and T. Kirsten et al. [Kir67**-I], [Kir68*-I] and had deduced an upper limit of 10~ 3 on the admixture r) of a right-handed leptonic current into the left-handed (V-A) Hamiltonian.

5) are marginally not yet excluded. 76 (Chapter VI) also demonstrates, that combined with the neutrino oscillation results from solar and atmospheric experiments and with precise determinations of cosmological parameters, double beta decay is obviously the only way to obtain precise informations about the neutrino mixing and the absolute mass scale in partially degenerate and degenerate neutrino mass scenarios. A general discussion of the potential of double beta decay and its decisive role for further investigation of the neutrino mass matrix is given in [Kla2000*-III], [Vis99*-III], [Giu99*-III], [Bil99], [Yas99*-III], [Min2000**-III], [Kal2000**-III], [Kla2000i**-III] (see also Fig.

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