α clustering and superdeformation of<sup>28</sup>Si

Taniguchi, Yukinobu; Kanada-En’yo, Yoshiko; Kimura, Masaaki

doi:10.1051/epjconf/20100306004

Cited by 1 publication

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cluster-structure states are not easily correlated with the isoscalar quadrupole strength, sometimes the 2 + band can be interpreted as 20 Ne +α configurations with a cluster-core excitation of 20 Ne(2 + ) [55]. Therefore, the peaks that were fitted in the E 2 strength distribution need to be investigated in finer detail to deduce evidence for a possible contribution from molecular configurations.…”

Section: Quadrupole Strengthmentioning

confidence: 99%

Investigation of the isoscalar response ofMg24toLi6scattering

Zamora¹,

Sullivan²,

Zegers³

et al. 2021

Phys. Rev. C

View full text Add to dashboard Cite

Background: 24 Mg is a strongly deformed nucleus in the ground state. Deformation effects can be observed in the structure of the isoscalar giant monopole and quadrupole resonances. 24 Mg is also a nucleus that is well known to present different types of cluster-oscillation modes. Both giant resonances and cluster states are strongly populated by isoscalar transitions. Purpose: To extract the E 0, E 1, and E 2 transition strengths via 6 Li scattering. The 6 Li probe is a powerful tool for investigating the isoscalar nuclear response with a very favorable ratio of resonance-to-continuum background. Method: Double-differential cross sections of 6 Li inelastic scattering, at the beam energy of 100 MeV/u, were measured in the excitation-energy range 10-40 MeV and scattering angles 0−3 • . A multipole-decomposition analysis was performed for extracting the isoscalar E 0, E 1, and E 2 strength distributions. Results: The extracted multipole strengths were compared with predictions from consistent quasiparticle random phase approximation calculations. The theoretical predictions are in fair agreement with the experimental data. The E 0 strength was also compared with results from antisymmetrized molecular dynamics calculations found in the literature. A few peaks in the experimental data might be associated with clustering in 24 Mg. Conclusions: Ground-state deformation effects were observed in the isoscalar giant monopole resonance (ISGMR) and isoscalar giant quadrupole resonance (ISGQR) distributions. The ISGMR strength is split in two peaks around 19 and 28 MeV. The ISGQR exhibits a pronounced peak at 20 MeV with a broadening at the low-energy region, similar to predictions from microscopic calculations. Signatures of excitation of cluster states were observed in the E 0 response. Further studies including particle-decay measurements will be required to confirm the nature of the observed peaks.

show abstract

Section: Quadrupole Strengthmentioning

confidence: 99%