Inhibition of the Fission Decay Channel of the Isoscalar Giant Quadrupole Resonance in the Actinide Region

Plicht, van der Johannes; Harakeh, Mohsen; Woude, A. van der; David, Peter; Debrus, J.

doi:10.1103/physrevlett.42.1121

Cited by 44 publications

(3 citation statements)

References 13 publications

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“…Isoscalar giant resonances have been investigated for a large number of nuclei over the range Z = 6−92 during the last decades [6][7][8][9][10][11][12][13][14][15][16][17]. Very interesting properties have been observed, such as overtone modes [18,19], off-shell nuclei softness [17,20], deformation effects [21,22], and many others.…”

Section: Introductionmentioning

confidence: 99%

“…Inelastic scattering of α particles at intermediate energies is a well-established technique that has been extensively employed in the investigation of isoscalar giant resonances for many years [6][7][8][9][10][11][12][13][14][15][16][17]. Alternatively, experiments using 6 Li scattering have also proven to be a good method for investigating the isoscalar strength [28].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the isoscalar response ofMg24toLi6scattering

Zamora¹,

Sullivan²,

Zegers³

et al. 2021

Phys. Rev. C

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the isoscalar response ofMg24toLi6scattering

Zamora¹,

Sullivan²,

Zegers³

et al. 2021

Phys. Rev. C

Self Cite

View full text Add to dashboard Cite

show abstract

“…Existem, também, estudos sobne o modo de decai mento da RGE2 em alguns núcleos actinÍdeos (32tn e 23Bu) t atnavás das neações (orcr',f¡ (N) e (61,i, 6Li"'f) (23), mas contendo resultados contnaditónios quanto à intensidade do modo de decaimento da RGE2. Na pnimeira expeniência (24) , a taxa medida do decaimento da RGE2 6 desprezível quando comPa rada com o cálculo da pnobabilidade de fissão. Outna maneina de se estuda:: o decaimento da RGE2 us-ndá eletnoexcitação, porám sem a deteção do elátnon espalhado, tem sido utilizada recentemente (25'26'.27) .…”

Section: Funclassified