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Probing Exotic Cross-Shell Interactions at N=28 with Single-Neutron Transfer on ^{47}K.

C J Paxman1, A Matta2, W N Catford1

  • 1University of Surrey, School of Maths and Physics, Guildford, GU2 7XH, United Kingdom.

Physical Review Letters
|May 9, 2025
PubMed
Summary
This summary is machine-generated.

We measured the ^{47}K(d,pγ)^{48}K transfer reaction, extending the ^{48}K level scheme and identifying new states. Discrepancies with shell-model calculations challenge descriptions of light nuclei.

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Area of Science:

  • Nuclear Physics
  • Atomic and Molecular Physics

Background:

  • The ^{48}K nucleus is crucial for understanding nuclear structure near the N=28 island of inversion.
  • Previous studies lacked detailed spectroscopic information for ^{48}K.

Purpose of the Study:

  • To perform the first measurement of the ^{47}K(d,pγ)^{48}K transfer reaction.
  • To extend the known level scheme of ^{48}K and deduce spectroscopic factors.
  • To investigate proton-neutron interactions in 1s and fp orbitals.

Main Methods:

  • Utilized inverse kinematics with a reaccelerated ^{47}K beam.
  • Performed a deuteron-induced proton transfer reaction (d,pγ).
  • Analyzed gamma-ray coincidences to identify excited states.

Main Results:

  • Identified nine new bound excited states in ^{48}K, significantly extending its level scheme.
  • Deduced spectroscopic factors for these states.
  • Observed discrepancies between experimental data and SDPF-U/SDPF-MU shell-model calculations.

Conclusions:

  • The ^{47}K(d,p) reaction provides unique insights into proton-neutron interactions.
  • Current shell-model interactions may not accurately describe proton configuration mixing in ^{48}K.
  • Challenges our understanding of light nuclei near the N=28 region.