Speaker
Description
The ISOLDE Superconducting Linear Spectrometer (ILS) [1] marks the start of the operational phase of the ISOLDE Superconducting Recoil Separator (ISRS) [2-3] project. Designed as the first operational stage of ISRS, the ILS provides a compact experimental platform to test the key superconducting magnet and beam optics technologies that will be implemented in the full separator. The system, prepared for installation at HIE-ISOLDE after Long Shutdown 3, represents a major step toward a fully functional recoil separator for high-precision nuclear reaction studies. Built around MAGDEM, a superconducting, iron-free Canted-Cosine-Theta (CCT) combined-function magnet, the ILS will enable detailed exploration of reaction mechanisms using radioactive ion beams.
Within the scope of the ISRS–ILS project, transfer reactions play a key role in the overall physics program. They provide crucial spectroscopic information on single-particle configurations, nuclear structure evolution, and the interaction between direct and compound processes. Accurate theoretical descriptions of these reactions, using the Distorted Wave Born Approximation (DWBA) and the Coupled Reaction Channels (CRC) formalism, are included in the optimization program of our recoil separator. These models underpin the theory behind designing and interpreting ILS measurements, ensuring experimental conditions and detection setups are optimized for each system under investigation.
Using the FRESCO code [4], several representative systems have already been examined within the DWBA framework as a baseline to improve future ISRS–ILS performance, with particular focus on developing CRC calculations for some selected cases, such as ⁹Li and ⁶⁸Ni. These studies aim to set quantitative benchmarks for the upcoming experimental program and to create a consistent framework for data interpretation within the ISRS–ILS physics program.
Among the wide range of candidate reactions, the ¹⁹Ne-induced transfer reaction has been selected as a priority for the initial ILS experiment. This decision is driven by the high beam intensity available at ISOLDE and by ILS’s unique ability to analyze ¹⁹Ne+d transfer channels, including (d,p) and (d,n), which can only be effectively studied with the advanced focusing and detection capabilities of the ILS setup. Corresponding theoretical calculations have been performed to prepare for the Day-1 experiment, using the ¹⁹Ne case as a reference system.
References
[1] I. Martel, T. Kurtukian-Nieto, I. Bustinduy, J. Resta (Spokespersons), CERN Letter of Intent INTC-I-283, https://cds.cern.ch/record/2921205/files/INTC-I-283.pdf
[2] I. Martel, O. Tengblad, J. Cederkäll (Spokespersons), CERN Letter of Intent INTC-I-228, https://cds.cern.ch/record/2749891/files/INTC-I-228.pdf
[3] ISRS website: http://www.uhu.es/isrs
[4] Ian J. Thompson, Comput. Phys. Rep. 7, 167 (1988).
