Nuclear structure and double beta decay: Two neutrino mode.
نویسندگان
چکیده
The decay rate of the 2v double beta decay is calculated. The effects of pairing, static quadrupole deformation, spin-isospin polarization, and the .6.33 isobar admixtures on the nuclear matrix elements are studied and the relation of the 2v {3{3 rate and the {3and f3+ strength is stressed. In agreement with other calculations, we predict a faster decay rate than has been observed experimentally in 8~e, 13<Te, and 150Nd.
منابع مشابه
Shell-model analysis of the 136Xe double beta decay nuclear matrix elements.
Neutrinoless double beta decay, if observed, could distinguish whether the neutrino is a Dirac or a Majorana particle, and it could be used to determine the absolute scale of the neutrino masses. 136Xe is one of the most promising candidates for observing this rare event. However, until recently there were no positive results for the allowed and less rare two-neutrino double beta decay mode. Th...
متن کاملNeutrinoless Double Beta Decay in Heavy Deformed Nuclei
The zero neutrino mode of the double beta decay in heavy deformed nuclei is investigated in the framework of the pseudo SU(3) model, which has provided an accurate description of collective nuclear structure and predicted half-lives for the two neutrino mode in good agreement with experiments. In the case of U the calculated zero neutrino half-life is at least three orders of magnitude greater ...
متن کاملn uc l - th / 9 60 20 32 v 1 2 1 Fe b 19 96 The Pauli principle , QRPA and the two - neutrino double beta decay ∗
The Pauli principle, QRPA and the two-neutrino double beta decay * Abstract We examine the violation of the Pauli exclusion principle in the Quasipar-ticle Random Phase Approximation (QRPA) calculation of the two-neutrino double beta decay matrix elements, which has its origin in the quasi-boson approximation. For that purpose we propose a new renormalized QRPA with proton-neutron pairing metho...
متن کاملDouble beta decay
Double beta decay is a rare nuclear process changing the nuclear charge by two units leaving atomic number unchanged. The detection of the neutrino accompanied mode (A,Z)?(A,Z+2)+2e+ 2n e: with half-lives around 10 20 years is among the rarest decays ever observed. Of outmost importance for particle physics and especially neutrino physics, is the neutrinoless mode (A,Z)?(A,Z+2)+2e. This process...
متن کاملEvidence for Neutrinoless Double Beta Decay
The data of the HEIDELBERG-MOSCOW double beta decay experiment for the measuring period August 1990 May 2000 (54.9813 kg y or 723.44 molyears), published recently, are analyzed using the potential of the Bayesian method for low counting rates. First evidence for neutrinoless double beta decay is observed giving first evidence for lepton number violation. The evidence for this decay mode is 97% ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review. C, Nuclear physics
دوره 32 4 شماره
صفحات -
تاریخ انتشار 1985