Investigation of Direct Nuclear Reactions in a Storage Ring Using In-Ring Detection

Abstract

\textbf{Background:} Experiments involving nuclear reactions in a storage ring offer exceptional possibilities for precise measurements in inverse kinematics. These experiments provide excellent angular and energy resolution by particle spectroscopy, in addition to high luminosities. However, the extremely low-pressure environment maintained in the storage rings poses significant difficulties for experiments employing detectors or any outgassing material in the ring. \textbf{Purpose:} To investigate nuclear reactions in inverse kinematics using the storage-ring technique. The reactions were induced by scattering of a ${}^{20}\mathrm{Ne}$ beam off a hydrogen target at an energy of 50~MeV/u. \textbf{Method:} A beam of fully stripped ${}^{20}$Ne ions was injected into the ESR storage ring at an energy of 50 MeV/u. The beam interacted with an internal hydrogen gas-jet target. An ultra-high vacuum compatible detector setup was installed around the gas jet inside the ring to measure the recoiling particles generated by nuclear reactions. \textbf{Results:} Multiple reaction channels were observed during the experiment. In particular, we present the results from studies on elastic and inelastic scattering, as well as the neutron transfer reaction ${}^{20}\mathrm{Ne}(p,d){}^{19}{\mathrm{Ne}}^{\ast }$. The experimental data were compared to calculations that took into account the most significant excited states, using a coupled-reaction channel approach. A very good agreement with the experimental data was achieved. \textbf{Conclusions:} The present results are the first demonstration of the investigation transfer reactions using detectors directly installed in the ring. This provides an important proof-of-principle for prospective studies with far-from-stability radioactive beams in the future.

References in corpus (7)

• Theory of Core-Collapse Supernovae
• Neutron Star Mergers and Nucleosynthesis of Heavy Elements
• Discovery of the shape coexisting 0+ state in 32Mg by a two neutron transfer reaction
• Coupled-channels calculations for nuclear reactions: from exotic nuclei to superheavy elements
• Analysis of two-nucleon transfer reactions in the 20Ne + 116Cd system at 306 MeV
• Migration of nuclear shell gaps studied in the d(24Ne,p gamma)25Ne reaction
• The nuclear force imprints revealed on the elastic scattering of protons with ${}^{10}$C