Conveners
Few-Body Systems: 1
- Francisco-Miguel MARQUES (LPC-Caen)
Few-Body Systems: 2
- There are no conveners in this block
In hypernuclear physics, it is important to study structure of light hypernuclei to extract information on hyperon-nucleon interaction. Recently, observed bound $\Xi$ hypernuclei such as $^{14}{\rm N}+\Xi$ and $^{11}{\rm B}+\Xi$ systems have been observed. Along this line, it is requested to predict what kind of $\Xi$ hypernuclei should be observed theoretically. In this talk, I will review...
In this contribution, I present our latest developments in the study of neutron-rich nuclei. In particular, recent observations of a sharp low-energy structure in the four-neutron missing mass distribution [1] —following the fast removal of the $^4$He core from $^8$He nucleus—have sparked considerable interest. We have been able to explain this phenomenon as a consequence of neutron...
The femtoscopy technique at the Large Hadron Collider has proven capable of providing unprecedented precision information on the low-energy interaction between nucleons and strange hadrons. The experimental methodology exploits the emission of particle pairs at the femtometer scale in the collisions and analyzes the momentum correlation induced by free scattering of the produced hadrons. The...
The study of light hypernuclei, subatomic nuclei containing strange quarks, is an active area of research explored by multiple collaborations [1,2,3,4,5,6]. Recent investigations using high energy heavy ion collisions have yielded surprising insights into the three body hypernuclear state, Λ3H (hypertriton). Experimental measurements of its lifetime [1,2,3,7,8,9,10] and binding energy...
Since the discovery of the neutron in 1932 [1], extensive experimental campaigns and calculations have been carried out to explore the possible existence of multineutron systems [2]. The dineutron being unbound, particular attention has been paid to the next even candidate, the tetraneutron, a system made up of four neutrons. Its few-body character and the absence of Coulomb interaction make...
Recent experiments [Duer et al., Nature 606 (2022)] suggest a resonance-like structure in the $^8\text{He(p,p}\alpha\text{)4n}$ reaction. To investigate this, we analyze four-neutron point-creation using pionless effective field theory (EFT) within the Faddeev-Yakubovsky formalism, which enables a decomposition into the 2+2 and 3+1 channel. This is particularly relevant given that...
The interest in the correlation function is based in the use of the femtoscopy technique in experiments at the Large Hadron Collider (LHC) to perform new high-precision studies of the low-energy interactions between hadrons. This experimental method exploits the production and emission of hadrons at relative distances of the order of a femtometer in $pp$ and $p$-nucleus collisions, to study...
Nuclear reactions are powerful to probe properties of exotic nuclei located away from stability. The accuracy of the information inferred from reaction measurements rely directly on the quality of the theoretical model used to analyze the experimental data. Reactions at intermediate energies are typically described within few-body models, which sees the reaction as composed of cluster of...
To advance our understanding of the universe, from physics beyond the Standard Model to cosmic events, a unified approach to nuclear structure and reactions is essential. This requires combining few-body techniques with ab initio many-body calculations of nuclear structure, supported by Effective Field Theory and Uncertainty Quantification. Reaction rates derived from first principles are...
Most of the known hadrons in the low-energy QCD spectrum are resonances observed in multiparticle scattering processes. First-principles determination of the properties of these unstable hadrons is a major goal of lattice QCD calculations. Significant progress has been made in the development, implementation and application of theoretical tools that relate finite-volume lattice QCD quantities...
Neutron-neutron correlations, specifically in light exotic systems such as two-neutron halo nuclei, is a topic that has attracted a revived interest [1,2]. These correlations are known to play a key role in binding the Borromean system [3,4], thus shaping their properties and dynamics in nuclear collisions. The particular features of these nn correlations extend beyond the driplines and may...
Studies of few-nucleon systems form the basis for understanding nuclear interactions and properties of nuclei. The very accurate theoretical calculations for three-nucleon systems should be confronted with a rich set of precise experimental data.
For this purpose, the BINA (Big Instrument for Nuclear-polarization Analysis) detection system has been installed at CCB (Cyclotron Center...
Scattering in three-nucleon systems at intermediate energies atracts attention due to sensitivity of the observables to subtle effects of the dynamics beyond the pairwise nucleon-nucleon force, so-called three nucleon force (3NF). Recently, the data for nucleon-deuteron collisions have also been considered as a tool for fine-tuning of the 3N Hamiltonian parameters in Chiral EFT. Deuteron...
Chiral effective field theory ($\chi$EFT) promises a systematic approach to describe the force between nucleons as arising from the fundamental principles of quantum chromodynamics. A power counting (PC) quantifies the relative importance of different contributions in the $\chi$EFT expansion. The PC ensures that the EFT predictions of observables show order-by-order convergence, which in turn...
