Near-Threshold Dipole Strength in Be10 with Isoscalar Character

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Abstract
Isoscalar dipole transitions are a distinctive fingerprint of cluster structures. A 1^{-} resonance at 7.27(10) MeV, located just below the α-emission threshold, has been observed in the deuteron inelastic scattering reactions off ^{10}Be. The deformation lengths of the excited states in ^{10}Be below 9 MeV have been inferred from the differential cross sections using coupled channel calculations. This observed 1^{-} resonance has isoscalar characteristics and exhausts approximately 5%-15% of the isoscalar dipole energy-weighted sum rule, providing evidence for pronounced α cluster structure in ^{10}Be. The Gamow coupled channel approach supports this interpretation and suggests the near-threshold effect might be playing an important role in this excitation energy domain. The α+α+n+n four-body calculation reproduces the observed enhanced dipole strength, implying that the four-body cluster structure is essential to describe the 1^{-} states in ^{10}Be.
Funding Information
  • National Science Foundation (PHY-1565546)
  • U.S. Department of Energy (DE-AC02-06CH11357, DE-SC0020451, DE-SC0000661)
  • Ministerio de Economía y Competitividad (RYC2019-028438-I)
  • National Key Research and Development Program of China (2022YFA160230)
  • Ministerio de Ciencia e Innovación (RYC2020-030669, PID2022-142557NA-I00)
  • Agencia Estatal de Investigación
  • National Natural Science Foundation of China (12147101, 12475120, 12435010)
  • Ministry of Science and Technology of the People's Republic of China (2022YFA1602303)
  • National Superconducting Cyclotron Laboratory

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