What question did this study set out to answer?

The aim is to explore the anomalous behavior of Coulomb energy differences in neutron-deficient nuclei near 70Br.

April 1, 2026Acta Physica Polonica B Proceedings Supplement0 citationsOpen Access

Gamma Spectroscopy of Neutron-deficient Nuclei Close to \ (^70\) Br Using the EAGLE Array and Ancillary Detectors at the Heavy Ion Laboratory in Warsaw

DDD. Duda MMM. Matejska-Minda AFA. Fijałkowska

Key Points

The aim is to explore the anomalous behavior of Coulomb energy differences in neutron-deficient nuclei near 70Br.
Conducted experiments at the Heavy Ion Laboratory in Warsaw.
Used an 88 MeV 32S beam on a 40Ca target.
Populated excited states in neutron-deficient nuclides through fusion-evaporation reactions.
Measured gamma rays with the EAGLE spectrometer.
Identified reaction channels using NEDA and DIAMANT detectors.
Observed a decrease in Coulomb energy difference with increasing spin for the 70Br/70Se pair.
Preliminary analysis indicates satisfactory performance of the detection setup.
The findings will facilitate further studies on the structure of the nuclei in question.

Abstract

The \ (A=70\), \ (T=1\) isobaric multiplet exhibits an anomalous Coulomb energy difference (CED) behavior, with the \ (^70\) Br/\ (^70\) Se pair showing a decrease in CED with increasing spin, contrary to the typical trend observed in other \ (pf\) -shell nuclei. To investigate this phenomenon, a dedicated experiment was carried out at the Heavy Ion Laboratory of the University of Warsaw using an 88 MeV \ (^32\) S beam impinging on a \ (^40\) Ca target. Excited states in \ (A 70\) neutron-deficient nuclides were populated in fusion–evaporation reactions. Gamma rays were measured with the EAGLE spectrometer, whereas the reaction channel identification was provided by the combined set of neutron — NEDA and charged particle — DIAMANT detectors. Preliminary data analysis shows the satisfactory performance of the setup, which will allow for in-depth studies of the structure of the nuclei of interest. Abstract Published by the Jagiellonian University 2026 authors

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