DREB Conference 2024

The s-wave neutron-nucleus scattering length $a_s$ characterizes the low-energy neutron scattering off nuclei. In the effective-range approximation, the neutron-nucleus scattering cross-section at very low energies tends to $4𝜋a_s^2$, giving to the scattering length a sense of nuclear apparent size experienced by a neutron approaching at low energy. Its specific value is the result of a...

The deuteron elastic and inelastic scattering reactions of ${}^{10}$Be have been measured with the AT-TPC coupling with SOLARIS in inverse kinematics. The deformation length of the excited states in ${}^{10}$Be below 9 MeV has been inferred from the differential cross sections with the CCBA calculation. A new $1^{-}$ state at 7.27(10) MeV, located just near the $\alpha$-emission threshold, has been...

Nuclei that present a three-body character have attracted special interest over the past few decades. Of particular relevance is the case of Borromean two-neutron halo nuclei, e.g., 6He, 11Li or 14Be, which exhibit exotic features in nuclear collisions [1]. The correlations between the valence neutrons, often described in terms of pairing, are known to play a fundamental role in shaping the...

In order to constrain the largely unknown multi-neutron interactions, it is necessary to measure the relevant observables sensitive to them. One such property is the possible existence of narrow resonances related to multi-neutron cluster structures and correlations${}^{[1][2]}$. This can be investigated by studying multi-neutron resonances close to the corresponding neutron removal thresholds...

Unbound states in the neutron-rich ${}^{17}$C nucleus were probed via the ${}^{16}$C(d,p) transfer reaction in inverse kinematics using the Active Target Time Projection Chamber (AT-TPC) placed in the HELIOS solenoid at the ATLAS facility in Argonne National Laboratory. A wide range of excitation energies from the ground state to approximately 10 MeV were measured using a ${}^{16}$C radioactive beam...