Nuclear Physics (CSN3)

BGOOD (BGO-Open Dipole)

The international BGOOD collaboration is made of about 60 physicists, from Italy, Germany, Russia, UK, Switzerland.

The BGOOD experiment is focused on the study of the excited states of the nucleon (proton and neutron) and in particular on the search of those nucleon resonances, which have not been observed so far.

It is installed at the ELSA accelerator in Bonn: a polarized photon beam, of energies up to 3 GeV, impinges on a H2 or D2 target and produces photonuclear reactions on the nucleon, whose final products are detected in a large solid angle detector. Example of studied photoreaction are:

1.     Pseudoscalar meson (eta and eta’) photoproduction

2.     Vector mesons (omega and phi) photoproduction

3.     Associated strangeness photoproduction K+ Lambda

4.     Associated strangeness photoproduction K0 Lambda

5.    Associated strangeness photoproduction  K0 Sigma+

6.     Excited hyperon photoproduction

7.     Associated strangeness photoproduction K

More details on the physics can be found  in the BGOOD site.

Some Italian members of the collaboration are also involved in the A2 experiment at the MAMI accelerator in Mainz, which is focused on the same physics at energies up to 1.6 GeV with the use of a polarized beam and a polarized target.

Both the two experiments are part of the CSNIII project MAMBO.




JLAB12 is an INFN experiment in the CSNIII that includes all Italian activities at Thomas Jefferson National Accelerator Facility (USA).

Jefferson Lab is a  laboratory for nuclear physics hosting CEBAF (Continuous Electron Beam Accelerator Facility), a 12 GeV  electron accelerator, and four experimental halls, A to D, equipped with advanced particle detectors.

The goal of the experiment is the study of the structure and dynamics of hadrons and nuclei through the scattering of (longitudinally polarized) 12 GeV electrons on (polarized) fixed nuclear targets.

More than 50 Italian physicists and engineers collaborate with the 1300 researchers of the JLab community to run experiments and carry out a broad program in hadronic physics.

The JLAB12 main research areas are: nucleon and nuclei form factors; nucleon structure functions; electromagnetic and weak electron-hadron interactions; meson spectroscopy; baryon spectroscopy and search for hybrid configurations; physics beyond the Standard Model.
JLAB12 experimental activity is supported by the Italian theoretical physics community that participates with more than 30 researchers in the study of QCD (Quantum Chromo Dynamics), that governs the structure of hadrons, and to the interpretation of experimental results.

The Roma Tor Vergata group is involved in the

1 - Realization and usage of polarized frozen-spin HD targets (HDice)

2 - Purity measurements of HD gas using Raman scattering trachnique

3 - Contribution to the construction of a Forward Tagger for Clas12

4 - Study of photo-production experiments on polarized nucleons

5 - Search for hybrid baryons in kaon electro-production

6 - Search for dark photons in the HPS experiment 



EIC  e' un futuro acceleratore di particelle che verra' realizzato presso il Brookheven Lab (USA),  nel quale un fascio di elettroni verra' fatto collidere con protoni e ioni per studiarne la struttura interna costituita da quark e gluoni legati insieme dall'interazione forte.

In questo senso l'EIC fungera' da vero e proprio microscopio subatomico che consentirà di investigare tale forza ed il ruolo dei gluoni nella natura della materia .