Abstract
This article discusses the main achievements and future perspectives of the MAGNEX spectrometer at the INFN-LNS laboratory in Catania (Italy). MAGNEX is a large acceptance magnetic spectrometer for the detection of the ions emitted in nuclear collisions below Fermi energy. In the first part of the paper an overview of the MAGNEX features is presented. The successful application to the precise reconstruction of the momentum vector, to the identification of the ion masses and to the determination of the transport efficiency is demonstrated by in-beam tests. In the second part, an overview of the most relevant scientific achievements is given. Results from nuclear elastic and inelastic scattering as well as from transfer and charge exchange reactions in a wide range of masses of the colliding systems and incident energies are shown. The role of MAGNEX in solving old and new puzzles in nuclear structure and direct reaction mechanisms is emphasized. One example is the recently observed signature of the long searched Giant Pairing Vibration. Finally, the new challenging opportunities to use MAGNEX for future experiments are briefly reported. In particular, the use of double charge exchange reactions toward the determination of the nuclear matrix elements entering in the expression of the half-life of neutrinoless double beta decay is discussed. The new NUMEN project of INFN, aiming at these investigations, is introduced. The challenges connected to the major technical upgrade required by the project in order to investigate rare processes under high fluxes of detected heavy ions are outlined.
Highlights
INFINITY [10], and the use of a specialized focal plane detector for the measurement of the optical phase spaceThe study of the motion of charged particles through a magnetic field is a well-established technique to explore the microscopic structure of the matter constituents
To explore the feasibility of such method, we propose to investigate in this first experiment the unstable nuclei in the 38S region, since they were already produced at Laboratori Nazionali del Sud (LNS) in the past [157]
Since the very first conceptual idea, the MAGNEX spectrometer was conceived as a multipurpose device for the detection of reaction products emitted in a broad range of energies, masses and angles
Summary
INFINITY [10], and the use of a specialized focal plane detector for the measurement of the optical phase space. The instrument was able to guarantee a quite high momentum resolving power (about 104), a maximum solid angle of 14.7 msr and pmax/pmin ranging from 1.1 to 1.28 in the different versions The flexibility of such complex spectrometers well faces the long-standing problem of kinematic broadening which limited the application of magnetic spectrometry to heavy ions physics. The focal plane detectors must provide the phase space boundary conditions (position and angle at the focus in a threedimensional space) This revolutionary approach was possible only thanks to the advent of new mathematical instruments as the differential algebra [2], which allows to compute exact expansions of the transport map around the reference trajectory up to very high order. With a reference to momentum spectrometers only, one should mention the European project R3B [46], the Japanese SHARAQ [47] and SAMURAI [48] at RIKEN and the Russian MAVRCORMA at JINR Dubna
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