Jorge G. Hirsch

Uncertainties in nuclear transition matrix elements for neutrinoless

P. K. Rath, R. Chandra, K. Chaturvedi, P. K. Raina and J. G. Hirsch Department of Physics, University of Lucknow, Lucknow-226007, India Department of Physics and Meteorology, IIT, Kharagpur-721302, India Department of Physics, Bundelkhand University, Jhansi-284128, India Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A.P. 70-543, México 04510 D.F., México (Dated: January 20, 2013)

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Abstract We estimate the double-beta half-life in the two-neutrino mode of several heavy deformed nuclei using the pseudo SU(3) shell-model scheme. In this approach, we used a recently developed summation procedure, avoiding the closure approximation. We find forbidden decays for five potential double-beta emitters and finite values for the half-life of six other nuclei, one of them strongly inhibited. These forbidden decays represent a possible test of our model and up to now the predictions are in good agreement with the available experimental data.

decay within the PHFB model

Abstract 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 238U the calculated zero-neutrino half-life is at least three orders of magnitude greater than the two-neutrino one, giving strong support of the identification of the radiochemically determined half-life as being the two-neutrino double beta decay. For 150Nd the zero-neutrino matrix elements are of the order of magnitude of, but lesser than, those evaluated using the QRPA. This result confirms that different nuclear models produce similar zero-neutrino matrix elements, contrary to the two-neutrino case. Using these pseudo-SU(3) results and the upper limit for the neutrino mass we estimate the ββ0ν half-lives for six nuclei. An upper limit for majoron coupling constant is extracted from the experimental data.

Double-beta decay in the pseudo SU(3) scheme

We present a fully quantum-mechanical, microscopic, unified treatment of ground-state band and multi-phonon

Neutrinoless double beta decay in heavy deformed nuclei

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Multiphonon gamma vibrational bands and the triaxial projected shell model

-vibrational bands using shell model diagonalization with the triaxial projected shell model. The results agree very well with data on the g- and

Neutrinoless ββ decay transition matrix elements within mechanisms involving light Majorana neutrinos, classical Majorons, and sterile neutrinos

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Multipolar correlations and deformation effect on nuclear transition matrix elements of double-β decay

-band spectra in

Nuclear deformation and neutrinoless double-beta decay of Zr-94, Zr-96, Mo-98, Mo-100, Ru-104, Pd-110, Te-128, Te-130, and Nd-150 nuclei within a mechanism involving neutrino mass

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Nuclear Masses Set Bounds on Quantum Chaos

Er, as well as with recently measured