1,126 research outputs found
Phase space factors and half-life predictions for Majoron emitting decay
A complete calculation of phase space factors (PSF) for Majoron emitting
decay modes is presented. The calculation makes use of
exact Dirac wave functions with finite nuclear size and electron screening and
includes life-times, single electron spectra, summed electron spectra, and
angular electron correlations. Combining these results with recent interacting
boson nuclear matrix elements (NME) we make half-life predictions for the the
ordinary Majoron decay (spectral index =1). Furthermore, comparing
theoretical predictions with the obtained experimental lower bounds for this
decay mode we are able to set limits on the effective Majoron-neutrino coupling
constant
New correlations induced by nuclear supersymmetry
We show that the nuclear supersymmetry model (n-susy) in its extended
version, predicts correlations in the nuclear structure matrix elements which
characterize transfer reactions between nuclei that belong to the same
supermultiplet. These correlations are related to the fermionic generators of
the superalgebra and if verified experimentally can provide a direct test of
the model.Comment: Invited talk at "Nuclear Physics: Large and Small", April 19-22,
2004, Hacienda Cocoyoc, Mexic
Everything you always wanted to know about SUSY, but were afraid to ask
New experimental tests of nuclear supersymmetry are suggested. They involve
the measurement of one- and two-nucleon transfer reactions between nuclei that
belong to the same supermultiplet. These reactions provide a direct test of the
`fermionic' sector, i.e. of the operators that change a boson into a fermion or
vice versa. We present some theoretical predictions for the supersymmetric
quartet of nuclei: 194Pt, 195Pt, 195Au and 196Au.Comment: 8 pages, 2 figures, proceedings of `Symmetries in Nuclear Structure',
March 23-29, 2003, Erice, Ital
Boson-conserving one-nucleon transfer operator in the interacting boson model
The boson-conserving one-nucleon transfer operator in the interacting boson
model (IBA) is reanalyzed. Extra terms are added to the usual form used for
that operator. These new terms change generalized seniority by one unit, as the
ones considered up to now. The results obtained using the new form for the
transfer operator are compared with those obtained with the traditional form in
a simple case involving the pseudo-spin Bose-Fermi symmetry in its limit. Sizeable differences are
found. These results are of relevance in the study of transfer reactions to
check nuclear supersymmetry and in the description of (\beta)-decay within IBA.Comment: 13 pages, 1 table, 0 figures. To be published in Phys. Rev.
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