Precision $\beta$-delayed charged-particle emission spectroscopy at FRIB: Proof of principle with the $\beta$-decay of $^{25}\mathrm{Si}$

E. A. M. Jensen; J. M. Eder; P. H. Pedersen; A. Adams; M. J. G. Borge; B. A. Brown; J. Dopfer; H. O. U. Fynbo; B. S. O. Johansson; B. Jonson; M. Madurga; J. S. Nielsen; K. Riisager; C. S. Sumithrarachchi; L. J. Sun; O. Tengblad; L. E. Weghorn; T. Wheeler; C. Wrede

arXiv · 2609.07799

Precision $\beta$-delayed charged-particle emission spectroscopy at FRIB: Proof of principle with the $\beta$-decay of $^{25}\mathrm{Si}$

E. A. M. Jensen·J. M. Eder·P. H. Pedersen·A. Adams·M. J. G. Borge·B. A. Brown·J. Dopfer·H. O. U. Fynbo·B. S. O. Johansson·B. Jonson·M. Madurga·J. S. Nielsen·K. Riisager·C. S. Sumithrarachchi·L. J. Sun·O. Tengblad·L. E. Weghorn·T. Wheeler·C. Wrede

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Abstract

We report on the $\beta$-delayed proton and $\gamma$-ray emission from $^{25}\mathrm{Si}$, measured at the Facility for Rare Isotope Beams (FRIB). Low-energy $^{25}\mathrm{Si}$ ions extracted from the Advanced Cryogenic Gas Stopper were implanted into a thin carbon foil surrounded by a compact, highly segmented array of silicon detector telescopes and two high-purity germanium detectors. This setup provides high-resolution charged-particle spectroscopy, establishing a proof of principle for precision stopped-beam decay studies at FRIB. We reconstruct the $^{25}\mathrm{Si}$ decay scheme, resolving new high-energy proton transitions and determining the feeding to excited states in $^{24}\mathrm{Mg}$. The observation of spectral interference patterns enables firm spin and parity assignments for highly excited states in $^{25}\mathrm{Al}$. The $^{25}\mathrm{Si}$ $\beta$-strength distribution is extracted and compared with large-scale shell-model calculations.

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E. A. M. Jensen, J. M. Eder, P. H. Pedersen, A. Adams, M. J. G. Borge, B. A. Brown, J. Dopfer, H. O. U. Fynbo, B. S. O. Johansson, B. Jonson, M. Madurga, J. S. Nielsen, K. Riisager, C. S. Sumithrarachchi, L. J. Sun, O. Tengblad, L. E. Weghorn, T. Wheeler, C. Wrede. 2026-09-07. Precision $\beta$-delayed charged-particle emission spectroscopy at FRIB: Proof of principle with the $\beta$-decay of $^{25}\mathrm{Si}$. https://arxiv.org/abs/2609.07799

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