Work

Core of F25 in the rotational model

Year: 2020

Type: article

Abstract: In a recent experiment, carried out at the Radioactive Isotope Beam Factory/RIKEN, the $^{25}\mathrm{F}(p,2p)^{24}\mathrm{O}$ reaction was studied at 270 MeV/A in inverse kinematics. Derived spectroscopic factors suggest that the effective core of $^{25}\mathrm{F}$ significantly differs from a free $^{24}\mathrm{O}$ nucleus. We interpret these results within the particle-rotor model and show that the experimental level scheme of $^{25}\mathrm{F}$ can be understood in the rotation-aligned coupling scheme with its $5/{2}_{1}^{+}$ ground state as the bandhead of a decoupled band. The excitation energies of the observed $1/{2}_{1}^{+}$ and $9/{2}_{1}^{+}$ states correlate strongly with the rotational energy of the effective core, seen by the odd proton, and allow us to estimate its ${2}^{+}$ energy at $\ensuremath{\approx}3.2\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}$ and a moderate quadrupole deformation ${\ensuremath{\epsilon}}_{2}\ensuremath{\approx}0.15$. The measured fragmentation of the $\ensuremath{\pi}{d}_{5/2}$ single-particle strength is discussed, and some further experiments suggested.

Source: Physical Review C

DOI: 10.1103/physrevc.102.041301