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Benchmarking the PreSPEC@GSI experiment for Coulex-multipolarimetry on the \(\pi (p_{3/2})\rightarrow \pi (p_{1/2})\) spin-flip transition in \(^{85}\hbox {Br}\)

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A first performance test of the Coulomb excitation multipolarimetry (Coulex-multipolarimetry) method is presented. It is based on a \(^{85}\hbox {Br}\,\pi p_{3/2}\rightarrow \pi p_{1/2}\) spin-flip experiment performed as part of the PreSPEC-AGATA campaign at the GSI Helmholtzzentrum für Schwerionenforschung (GSI). Via determination of background levels around the expected \(^{85}\hbox {Br}\) excitations as well as measured \(^{197}\hbox {Au}\) excitations, an upper limit for the M1 transition strength of the \(1/2_1^-\rightarrow 3/2_\text {g.s.}^-\) transition in \(^{85}\hbox {Br}\) and a lower beam time limit for upcoming experimental campaigns utilizing Coulex-multipolarimetry have been inferred. The impact of the use of AGATA in its anticipated \(1\pi \) configuration on these estimates is deduced via Geant4 simulations.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.]


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  2. Ratio of measurable time in an arbitrary time window.

  3. A \(2\sigma \) interval around the peak-of-interest was used for the P/B calculations.

  4. Point of \(\gamma \)-ray emission not perfectly known.


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The authors want to thank A. Lopez-Martens for helpful advice on possible analysis methods and U. Friman-Gayer for statistics-related advice. In addition, the authors want to thank the AGATA collaboration for providing the necessary data. This work was supported by the German BMBF under Grant Numbers 05P19RDFN1, 05P18RDFN9 and 05P19PKFNA, the Bulgarian National Science fund under grant number DN 08/23, the Swedish Research Council under contracts Nos. 2010-147, 2011-5253 and 2011-6127, HGS-HIRe and HIC for FAIR. This work has been supported by the European Community FP7–Capacities, ENSAR Contract No. 262010.

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Correspondence to P. Napiralla.

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Communicated by Calin Alexandru Ur

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Napiralla, P., Lettmann, M., Stahl, C. et al. Benchmarking the PreSPEC@GSI experiment for Coulex-multipolarimetry on the \(\pi (p_{3/2})\rightarrow \pi (p_{1/2})\) spin-flip transition in \(^{85}\hbox {Br}\). Eur. Phys. J. A 56, 147 (2020).

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