Near-Threshold Dipole Strength in <math display="inline"><mrow><mmultiscripts><mrow><mi>Be</mi></mrow><mprescripts/><none/><mrow><mn>10</mn></mrow></mmultiscripts></mrow></math> with Isoscalar Character

Chen, J.; Ayyad, Y.; Bazin, D.; Mittig, W.; Serikow, M.Z.; Keeley, N.; Wang, S.M.; Zhou, B.; Zamora, J.C.; Beceiro-Novo, S.

doi:10.1103/PhysRevLett.134.012502

Near-Threshold Dipole Strength in ${}^{10}{Be}$ with Isoscalar Character

Jan 9, 2025

7 pages

Published in:

Phys.Rev.Lett. 134 (2025) 1, 012502

Published: Jan 9, 2025

DOI:

10.1103/PhysRevLett.134.012502 (publication)

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Abstract: (APS)

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}

.

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Near-Threshold Dipole Strength in Be10 with Isoscalar Character

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Near-Threshold Dipole Strength in ${}^{10}{Be}$ with Isoscalar Character