While waiting for γ beams at ELI-NP: First results from ELIGANT and ELIFANT experiments

Extreme Light Infrastructure - Nuclear Physics (ELI-NP), "Horia Hulubei" National Institute for R&D in Physics and Nuclear Engineering (IFIN-HH), 30 Reactorului Street, 077125 Magurele, Romania

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Published online: 21 November 2025

Abstract

In the period 2022-2025, four experimental campaigns were car­ried out at the 9 MW tandem accelerator of IFIN-HH using the large-volume LaBr₃ :Ce and CeBr₃ detectors of the ELIGANT-GN array, which were placed in the anti-Compton shields of the ROSPHERE. As a result, a highly efficient spec­trometer, ELIFANT, was assembled for the detection of high-energy gamma rays. In the experiments, nuclear level densities and γ-strength functions were studied, as well as weak γ-ray transitions in light nuclei. In the paper, the per­formance of the spectrometer is described, the goals of the campaigns are sum­marized, and first results are presented, e.g., the γ-ray spectroscopy in ¹⁰B and the γ-strength functions in ^112,114Sn. The ELIGANT-GN array was also used to study neutron and γ-ray angular and energy correlations in spontaneous fission of ²⁵²Cf. First results from these studies are presented, too.