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The 5th Nuclear Photonics Conference

Oct 6 – 10, 2025
TU Darmstadt
Europe/Berlin timezone

Local Organizing Committee

Towards the Isovector Spin-$M1$ Response of $^{90}$Zr and $^{92}$Mo

Not scheduled
20m
Poster presentation Poster Session

Speaker

AMRITA GUPTA (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany)

Description

Electron-capture rates on medium-heavy nuclei play a crucial role in the last stage of core-collapse supernovae of massive stars during the deleptonization process. While these rates are highly sensitive to their Gamow-Teller (GT) strength [1], their direct measurement remains experimentally challenging. As an isospin analogue, the isovector spin-flip M1 (IVSM1) response offers an alternative probe, which we investigate in the $N=50$ isotones $^{90}$Zr and $^{92}$Mo. The presence of two extra protons in $^{92}$Mo's proton $g_{9/2}$ orbital beyond the closed pf shell makes it a potential candidate for exhibiting enhanced isovector spin-flip M1 (IVSM1) strength in comparison to $^{90}$Zr. Furthermore, $^{92}$Mo is of additional interest as it provides a testing ground for exploring the recently proposed $\nu r$ process [2]. The complete characterization of dipole strength for both isotones in terms of E1 and M1 strength has been studied using nuclear resonance fluorescence (NRF) with the Clover array, a newly developed hybrid array of HPGe Clover and LaBr$_3$ detectors at the High Intensity $\gamma$-ray Source (HI$\gamma$S) facility of the Triangle Universities Nuclear Laboratory, Duke University using fully-polarized $\gamma$-ray beams with a beam-energy resolution of about $3\%$. By measuring asymmetries of ground-state transitions in an integral approach, we aim to obtain the overall M1/E1 ground-state transition strength up to 10 MeV. The experimental setup, status, and first results of the analysis will be presented.

This work has been supported by DFG Project Nos. 279384907–SFB 1245, 499256822-GRK 2891, and U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Grants No. DE-FG02-97ER41041 (UNC), and No. DE-FG02-97ER41033 (Duke, TUNL).
[1] K. Langanke et al., Rep. Prog. Phys. 84, 066301 (2021).
[2] Z. Xiong et al., Physical Review L. 132, 192701 (2024).

Primary author

AMRITA GUPTA (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany)

Co-authors

Volker Werner (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) Akaa Daniel Ayangeakaa (Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA) Maike Beuschlein (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) Sean Finch (Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA and Department of Physics, Duke University, Durham, North Carolina 27708-0308, USA) Udo Friman-Gayer (Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA , Department of Physics, Duke University, Durham, North Carolina 27708-0308, USA and European Spallation Source ERIC, Partikelgatan 5, 22484 Lund, Sweden) David Gribble (Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA) Julian Hauf (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) Katharina Ide (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) Johann Isaak (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) Xavier James (Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA) Robert V. F. Janssens (Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA) Samantha Johnson (Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA) Jörn Kleemann (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) Pavlos Koseoglou (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) Tyler Kowalewski (Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA) Bastian Löher (GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany) Oliver Papst (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) Norbert Pietralla (Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany) Antonella Saracino (Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA) Deniz Savran (GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany) Nirupama Sensharma (Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA)

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