Speaker
Description
A few-scattering system offers a good opportunity
to study dynamical aspects of three-nucleon forces ($3N$Fs),
which are momentum, spin, and isospin dependent, since it provides
not only cross sections but also a variety of spin observables
at different incident nucleon energies.
Direct comparison between the experimental data
and the rigorous numerical calculations
based on the realistic bare nuclear potentials
provides information on $3N$Fs.
Indeed, the last two decades have witnessed the extensive experimental
and theoretical investigations of the nucleon-deuteron scattering performed
in a wide range of incoming nucleon energies up to
$E ¥sim 300 ~¥rm MeV/nucleon$.
The four-nucleon ($4N$) systems could also play an
important role for the study of 3NFs.
3NF effects are expected to be sizable in the $4N$ system.
In addition,
while the $Nd$ scattering is essentially a pure isospin $T=1/2$
state, tests of the $T=3/2$ channel in any 3NFs can
be performed in a $4N$ system such as proton-$^3\rm He$ scattering.
In Ref. [1] there has been a large progress in solving the $4N$ scattering problem
with realistic Hamiltonian even above four-nucleon breakup threshold energies,
which opens up new possibilities for approaching properties of 3NFs.
With the aim of exploring the 3NFs in $4N$ scattering, experiments of proton-$^3\rm He$ scattering using the polarized beam and target systems are in progress in Japan.
In the conference, we introduce recently conducted experiments [2,3,4]
and present the results of the comparison between the
experimental data and the theoretical predictions
based on the realistic bare nuclear potentials.
[1] A. Deltuva, and A. C. Fonseca, Phys. Rev. C 87, 054002 (2013).
[2] A. Watanabe, K. Sekiguchi et al., Phys. Rev. C 103, 044001 (2021).
[3] A. Watanabe, K. Sekiguchi et al., Phys. Rev. C 106, 054002 (2022).
[4] A. Watanabe, K. Sekiguchi et al., Phys. Rev. C 112, 054001 (2025).
| Theoretical or experimental | Experimental |
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