Identification of Prompt Proton Emission in N=Z-1 Ga 61:Isospin Symmetry at the Limit of Nuclear Binding

Excited states in the proton drip line nucleus Ga61 were populated via the fusion-evaporation reaction Mg24(Ca40,p2n)Ga61. The experimental setup at Argonne National Laboratory comprised a novel combination of the Gammasphere array with two CD-shaped double-sided Si-strip detectors inside the Microball CsI(Tl) charged-particle detection array, as well as the Neutron-Shell liquid scintillators and the Fragment Mass Analyzer. Owing to the setup's unprecedented in-beam proton spectroscopy and tracking capabilities, a coincidence between a 957.6(5)-keV γ ray and a 1.876(24)-MeV proton line was observed, which identifies the quasibound proton πg9/2 single-particle state in Ga61 at Ex=2150(34) keV. This probes isospin symmetry at the limit of nuclear binding by providing a unique challenge for the shell-model interpretation of mirror nuclei beyond doubly magic Ni56.

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Publication Details

Journal
White Rose Research Online (University of Leeds, The University of Sheffield, University of York)
Published
2025-11-25
Primary Topic
Nuclear physics research studies
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article
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article

Identification of Prompt Proton Emission in N=Z-1 Ga 61:Isospin Symmetry at the Limit of Nuclear Binding

T. Lauritsen, Y. Hrabar, D. Seweryniak, U. Forsberg et al.
White Rose Research Online (University of Leeds, The University of Sheffield, University of York)
Nuclear physics research studies
article

Identification of Prompt Proton Emission in N=Z-1 Ga 61:Isospin Symmetry at the Limit of Nuclear Binding

T. Lauritsen, Y. Hrabar, D. Seweryniak, U. Forsberg, C. J. Chiara, H. Jayatissa, T. Huang, G. L. Wilson, J. T. Anderson, W. Reviol, A. Idini, H. M. Albers, D. Rudolph, M. A. Bentley, J. Wu, P. Golubev, C. Müller-Gatermann, P. A. Copp, M. P. Carpenter, X. Pereira-Lopez, S. Uthayakumaar, B. G. Carlsson, S. Stolze, J. Ekman, C. Fahlander, D. M. Cox, L. G. Sarmiento
article en

Abstract

Excited states in the proton drip line nucleus Ga61 were populated via the fusion-evaporation reaction Mg24(Ca40,p2n)Ga61. The experimental setup at Argonne National Laboratory comprised a novel combination of the Gammasphere array with two CD-shaped double-sided Si-strip detectors inside the Microball CsI(Tl) charged-particle detection array, as well as the Neutron-Shell liquid scintillators and the Fragment Mass Analyzer. Owing to the setup's unprecedented in-beam proton spectroscopy and tracking capabilities, a coincidence between a 957.6(5)-keV γ ray and a 1.876(24)-MeV proton line was observed, which identifies the quasibound proton πg9/2 single-particle state in Ga61 at Ex=2150(34) keV. This probes isospin symmetry at the limit of nuclear binding by providing a unique challenge for the shell-model interpretation of mirror nuclei beyond doubly magic Ni56.

White Rose Research Online (University of Leeds, The University of Sheffield, University of York)
Openalex Percentile: Top 20%
Nuclear physics research studies
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Identification of Prompt Proton Emission in N=Z-1 Ga 61:Isospin Symmetry at the Limit of Nuclear Binding — T. Lauritsen, Y. Hrabar, et al. · White Rose Research Online (University of Leeds, The University of Sheffield, University of York) (2025) | TGRS Research Map | TGRS