Recent results on heavy-ion induced reactions of interest for neutrinoless double beta decay at INFN-LNS (original) (raw)
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Recent results on Heavy-Ion induced reactions of interest for 0νββ decay
Journal of Physics: Conference Series
An updated overview of recent results on Heavy-Ion induced reactions of interest for neutrinoless double beta decay is reported in the framework of the NUMEN project. The NUMEN idea is to study heavy-ion induced Double Charge Exchange (DCE) reactions with the aim to get information on the nuclear matrix elements for neutrinoless double beta (0νββ) decay. Moreover, to infer the neutrino average masses from the possible measurement of the half- life of 0νββ decay, the knowledge of the nuclear matrix elements is a crucial aspect.
Recent results on heavy-ion direct reactions of interest for 0νββ decay at INFN - LNS
Journal of Physics: Conference Series, 2020
Neutrinoless double beta decay of nuclei, if observed, would have important implications on fundamental physics. In particular it would give access to the effective neutrino mass. In order to extract such information from 0νββ decay half-life measurements, the knowledge of the Nuclear Matrix Elements (NME) is of utmost importance. In this context the NUMEN and the NURE projects aim to extract information on the NME by measuring cross sections of Double Charge Exchange reactions in selected systems which are expected to spontaneously decay via 0νββ. In this work an overview of the experimental challenges that NUMEN is facing in order to perform the experiments with accelerated beams and the research and development activity for the planned upgrade of the INFN-LNS facilities is reported.
2015
An innovative technique to access the nuclear matrix elements entering the expression of the life time of the double beta decay by relevant cross sections measurements of double charge exchange reactions is proposed. A key aspect of the project is the use of the MAGNEX large acceptance magnetic spectrometer, for the detection of the ejectiles, and of the LNS K800 Superconducting Cyclotron (CS), for the acceleration of the required high resolution and low emittance heavy-ion beams, already in operation at INFN Laboratory Nazionali del Sud in Catania (Italy)
Recent experimental activity on heavy-ion induced reactions within the NUMEN project
EPJ Web of Conferences
The possibility to use a special class of heavy-ion induced direct reactions, such as double charge exchange reactions, is discussed in view of their application to extract information that may be helpful to determinate the nuclear matrix elements entering in the expression of neutrinoless double beta decay half-life. The strategies adopted in the experimental campaigns performed at INFN - Laboratori Nazionali del Sud are briefly described, emphasizing the advantages of the multi-channel approach to nuclear reaction data analysis.
Mechanisms of neutrinoless double-beta decay: A comparative analysis of several nuclei
Physics of Atomic Nuclei, 2010
The neutrinoless double beta decay of several nuclei that are of interest from the experimental point of view ( 76 Ge, 82 Se, 100 Mo, 130 Te, and 136 Xe) is investigated on the basis of a general Lorentzinvariant effective Lagrangian describing physics effects beyond the Standard Model. The half-lives and angular-correlation coefficients for electrons are calculated for various decay mechanisms associated, in particular, with the exchange of Majorana neutrinos, supersymmetric particles (with R-parity violation), leptoquarks, and right-handed W R bosons. The effect of theoretical uncertainties in the values of relevant nuclear matrix elements on decay features is considered.
The European Physical Journal A, 2015
The knowledge of the nuclear matrix elements for the neutrinoless double beta decay is fundamental for neutrino physics. In this paper, an innovative technique to extract information on the nuclear matrix elements by measuring the cross section of a double charge exchange nuclear reaction is proposed. The basic point is that the initial and final state wave functions in the two processes are the same and the transition operators are similar. The double charge exchange cross sections can be factorized in a nuclear structure term containing the matrix elements and a nuclear reaction factor. First pioneering experimental results for the 40 Ca(18 O, 18 Ne) 40 Ar reaction at 270 MeV incident energy show that such cross section factorization reasonably holds for the crucial 0 + 0 + transition to 40 Ar gs , at least at very forward angles.
Double beta decays and neutrino nuclear responses
Nuclear Physics B - Proceedings Supplements, 1999
ej irii.:' rc nl~.osaka-u.ac.j p Osaka Uniw~rsity. Neutrinos (u) beyond the standard theory are studied by investigating double beta decays (fl/~). The present stal.us of 3/3 studies a.t RCNP is briefly reported. The/3/) decays on l°°Mo and 4SCa are studied at the Oto Cosmo Observal.ory. The Oto observatory is a new underground laboratory with low Rn and cosmic-ray backgrounds. The sensitivities expecled there are 0.5~leV for the Majorana v-mass, 10-c' ~10-s for the right-handed weak currents, 2~,I.10-5 for the v-blajoron coupling, and so on. Nuclear axial weak responses for f:¢/3-v are investigated by charge-exchange spin-flip nuclear reactions.