Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 13: Structure and Dynamics of Nuclei III

HK 13.7: Talk

Tuesday, March 17, 2026, 18:15–18:30, AM 00.011

Determination of ground-state decay level width in ²⁷Al using the temperature-dependent self-absorption technique — •K. Prifti¹, V. Werner¹, N. Pietralla¹, U. Ahmed¹, M. Baumann¹, M. Beuschlein¹, J. Bormans^1,2, I. Brandherm¹, M. L. Cortes¹, B. Götz¹, A. Gupta¹, J. Hauf¹, B. Hesbacher¹, M. Heumüller¹, K. E. Ide¹, J. Isaak¹, I. Jurosevic¹, J. Kleemann¹, P. Koseoglou¹, J. Lu¹, H. Mayr¹, C. M. Nickel¹, O. Papst¹, T. Ramaker¹, M. Rech¹, D. M. Richter¹, T. M. Sebe^3,4, T. Stetz¹, and R. Zidarova¹ — ¹IKP, TU Darmstadt — ²GSI, Darmstadt — ³ELI-NP, IFIN-HH, Romania — ⁴Politehnica Bucharest, Romania

The first temperature-dependent relative self-absorption (TRSA) measurement was conducted at the Darmstadt High-Intensity Photon Setup (DHIPS) at the superconducting Darmstadt linear electron accelerator (S-DALINAC) on the nucleus ²⁷Al using a bremsstrahlung photon beam with an endpoint energy of 5.5 MeV. This technique enables the separation of the natural linewidth of the nuclear transition from the Doppler broadening caused by the thermal motion of atoms in the solid target. The present work aims to measure the ground-state decay width of the 3957 keV level with high precision. Measurements were performed with and without an absorbing target at three different temperatures: 77 K, 320 K, and 600 K. The technique and its connection to both nuclear and atomic theory will be presented with a discussion of the results. This work was supported by the DFG under Project-ID 279384907–SFB 1245 and Project-ID 499256822–GRK 2891 "Nuclear Photonics".

Keywords: Temperature-dependent relative self-absorption; Level width; Effective temperature; Bremsstrahlung