The STRASSE (Silicon Tracker for RAdioactive nuclei Studies at SAMURAI Experiments) project addresses key questions in modern nuclear physics, particularly the evolution of nuclear shell structure and the behavior of exotic nuclei far from stability. By studying quasi-free scattering (QFS) reactions, STRASSE aims to:
Quasi-free scattering (QFS) in inverse kinematics (using proton targets) is a powerful tool for studying the microscopic structure of atomic nuclei. In QFS:
STRASSE builds on the success of previous QFS experiments (e.g., MINOS at RIKEN) but improves resolution to address limitations in existing setups.
| Goal | Description |
|---|---|
| Missing-Mass Spectroscopy | Achieve a missing-mass resolution < 2 MeV (σ) for (p,2p) and (p,3p) reactions, enabling the study of unbound states and exotic nuclei (e.g., ²⁸O, ¹⁰He). |
| In-Beam γ-Ray Spectroscopy | Combine with high-resolution γ-ray arrays (e.g., AGATA, GRETA) to reach Doppler-corrected energy resolutions of 1–2% (FWHM). |
| Shell Evolution Studies | Investigate shape coexistence, deformation, and magic number breakdown in neutron-rich nuclei (e.g., Ca, Ti isotopes). |
| Nucleon-Nucleon Interactions | Test predictions of effective nucleon-nucleon interactions, including spin-isospin terms and three-nucleon forces. |
STRASSE aligns with global efforts in nuclear physics, including: