Identification of Prompt Proton Emission in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>N</mml:mi> <mml:mo>=</mml:mo> <mml:mi>Z</mml:mi> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> <
Excited states in the proton drip line nucleus ^{61}Ga were populated via the fusion-evaporation reaction ^{24}Mg(^{40}Ca,p2n)^{61}Ga. 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 πg_{9/2} single-particle state in ^{61}Ga at E_{x}=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 ^{56}Ni.
Authors
- H. Jayatissa (ORCID: https://orcid.org/0000-0001-8746-0234)
- J. Ekman (ORCID: https://orcid.org/0000-0003-1945-5710)
- M. A. Bentley (ORCID: https://orcid.org/0000-0001-8401-3455)
- A. Idini (ORCID: https://orcid.org/0000-0001-7624-8975)
- G. L. Wilson
- W. Reviol (ORCID: https://orcid.org/0000-0002-5372-7743)
- P. Golubev (ORCID: https://orcid.org/0009-0001-1579-4072)
- S. Stolze
- T. Lauritsen (ORCID: https://orcid.org/0000-0002-9560-0388)
- M. P. Carpenter
- C. Müller-Gatermann
- D. Seweryniak (ORCID: https://orcid.org/0009-0003-3028-9693)
- D. M. Cox (ORCID: https://orcid.org/0000-0002-2790-8348)
- X. Pereira-López (ORCID: https://orcid.org/0000-0003-0678-3109)
- B. G. Carlsson
- Y. Hrabar (ORCID: https://orcid.org/0000-0002-3194-1001)
- H. M. Albers (ORCID: https://orcid.org/0000-0002-0971-1197)
- C. J. Chiara (ORCID: https://orcid.org/0000-0001-9969-0248)
- P. A. Copp
- U. Forsberg
- S. Uthayakumaar (ORCID: https://orcid.org/0000-0002-3154-0734)
- D. Rudolph (ORCID: https://orcid.org/0000-0003-1199-3055)
- C. Fahlander (ORCID: https://orcid.org/0000-0003-4959-5490)
- L. G. Sarmiento (ORCID: https://orcid.org/0000-0001-7600-2772)
- Tianping Huang (ORCID: https://orcid.org/0009-0003-0259-8712)
- J. Wu
- John Anderson
Institutions
- Louisiana State University (US)
- Argonne National Laboratory (US)
- GSI Helmholtz Centre for Heavy Ion Research (DE)
- Malmö University (SE)
- Lund University (SE)
- United States Army Combat Capabilities Development Command (US)
- University of York (GB)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-11-07
- DOI
- https://doi.org/10.1103/kwm2-9bmd
- Primary Topic
- Nuclear physics research studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00