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Nakayama, S.; Yamagata, T.; Akimune, H.; Daito, I.; Fujimura, H.; Fujita, Y.; Fujiwara, M̄.; Fushimi, K.; Greenfield, M. B.; Kohri, H.; Koori, N.; Kondo, Takahisa; Tamii, A.; Tanaka, M.; Toyokawa, H.

doi:10.1103/physrevlett.87.122502

Cited by 18 publications

(1 citation statement)

References 16 publications

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“…the slightly unbound particle [49,112]-whose wave function extends far apart from the αcluster configurations, i.e. α + d, α + t, 4α + n in 6 Li, 7 Li and 17 O, respectively-as inferred from the dipole resonances observed at relatively low excitation energies [113,114]. Such cluster structures were avoided in the 1ÿω cross-shell fits to the WBP and FSU interactions because of potential distortion in the A = 5−9 region.…”

Section: Discussionmentioning

confidence: 99%

Electric dipole polarizability of low-lying excited states in atomic nuclei

Orce,

Ngwetsheni

2024

J. Phys. G: Nucl. Part. Phys.

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New equations for the electric dipole polarizability αE1 of low-lying excited states in atomic nuclei — and the related (–2) moment of the total photo-absorption cross section, σ–2 — are inferred in terms of electric dipole and quadrupole matrix elements. These equations are valid for arbitrary angular momenta of the initial/ground and final/excited states and have been exploited in fully converged 1h̄ω shell-model calculations of selected p- and sd-shellnuclei that consider configuration mixing; advancing previous knowledge from 17O to 36Ar, where thousands of electric dipole matrix elements are computed from isovector excitations which include the giant dipole resonance region. Our results are in reasonable agreement with previous shell-model calculations and follow — except for 6,7 Li and 17,18 O — Migdal’s global trend provided by the combination of the hydrodynamic model and second-order non-degenerate perturbation theory. Discrepancies in 6,7Li and 17O arise as a result of the presence of α-cluster configurations in odd-mass nuclei, whereas the disagreement in 18O comes from the mixing of intruder states, which is lacking in the shell-model interactions. More advanced ab initio calculations of the dipole polarizability for low-lying excited states covering all the isovector states within the giant dipole resonance region are missing and could be very valuable to benchmark the results presented here and shed further light on how atomic nuclei polarize away from the ground state

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