Recent results from NUMEN project.

Agodi C.

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I - Fisica nucleare e subnucleare
Aula Palazzo dell'Emiciclo - Sala Ipogea - Martedì 24 h 17:30 - 19:30
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To determine quantitative information from the possible measurement of the neutrinoless double-beta-decay ($0\nu\beta\beta$) half-lives, the knowledge of the Nuclear Matrix Elements (NME) involved in the transition is mandatory. The NUMEN project proposes an innovative technique to access the $0\nu\beta\beta$ NME using heavy-ion induced double charge exchange (DCE) reactions. The basic point is that there are a number of similarities between the two processes, mainly that the initial and final state wave functions in the two processes are the same and the transition operators are similar, including in both cases a superposition of Fermi, Gamow-Teller and rank-two tensor components. A key aspect of the project is the use at Laboratori Nazionali del Sud (LNS) of the Superconducting Cyclotron for the acceleration of the required high resolution and low emittance heavy-ion beams and of MAGNEX large acceptance magnetic spectrometer for the detection of the ejectiles. The concurrent measurement of the other relevant reaction channels allows to disentangle the direct DCE mechanism from the competing multi-nucleon transfer processes. In this picture, NUMEN has started an experimental campaign at the INFN-LNS in Catania, using the MAGNEX magnetic spectrometer, focused on DCE reactions involving the nuclei of interest for $0\nu\beta\beta$ decay. Recent results obtained by the (${}^{20}Ne$, ${}^{20}O$) DCE reaction and competing channels, measured for the first time using a ${}^{20}Ne$ cyclotron beam at 15 AMeV, on ${}^{116}Cd$, ${}^{130}Te$ and ${}^{76}Ge$ targets will be discussed.

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