NUCSYS

The strongly correlated nuclear system 

 

 

Abstract


The present project results from a partial merging of two previous INFN projects:
Few-Body Systems (FBS) and Many-Body Systems (MANYBODY), both of them
intended to describe particular aspects of atomic nuclei which are relevant for the
progress in the knowledge of fundamental interactions.
On the one hand, the ab-initio approach to few-nucleon systems offers a privileged
laboratory to validate and constrain our modern understanding of the nuclear
interaction, the nucleon-hyperon interaction, and the interaction of nuclei with external
probes, based on the (chiral) effective field theory (EFT) paradigm. On the other hand,
experiments probing fundamental interactions often involve medium and heavy nuclei,
which makes it necessary to consider many-body effects and to bridge the two
domains. Prominent examples are next-generation long-baseline neutrino experiments,
aimed at the precise determination of the oscillation parameters. They will require
accurate modeling of nuclear effects in medium and heavier nuclei at relativistic
energies.
 
Specifically, the goals of the present project for the next three years are:
A) To implement the contact three-nucleon interaction at fifth order (N4LO) in order to
solve discrepancies observed in polarization observables in three- and four-nucleon
systems at low energies.
B) To pursue the pionless and halo-cluster EFT approaches to the nuclear interaction,
valid at much lower energies, in connection to universal properties of weakly bound
systems.
C) To perform a systematic study, within chiral, pionless and halo-cluster EFT, of
nuclear processes of astrophysical interest, as for example the A=3-6 radiative
captures, of relevance for the theory of the Big Bang Nucleosynthesis.
D) To continue the work on the construction of a microscopic nucleon- and
antinucleon-nucleus optical potential from chiral forces, thus providing a bridge
between few- and many-body dynamics.
E) To extend the study of the electroweak nuclear responses in the GeV region to
higher excitation energies and to exclusive reactions, with the aim of improving the
present knowledge of nuclear effects in neutrino- and antineutrino-nucleus scattering.
F) To perform accurate calculations of parity and/or time-reversal violating observables
in light nuclei that will allow, when confronted to on-going experimental efforts
worldwide, to address the structure of hadronic parity violation or fundamental issues
like identifying sources of CP violation beyond the Standard Model.
G) To provide theoretical support and guidance in nuclear processes for strategic
INFN-Labs projects in fundamental research as well as in applications, such as the
national programs for the production of innovative radionuclides and radiolabeled
compounds for advanced medical therapies and diagnostics. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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April, 20-21 2022

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