High-resolution inelastic electron scattering on 208 Pb at 50 and 63.5 MeV and fragmentation of the magnetic quadrupole strength

Frey, R.; Richter, A.; Schwierczinski, A.; Spamer, E.; Titze, O.; Knüpfer, W.

doi:10.1016/0370-2693(78)90055-2

Cited by 32 publications

(4 citation statements)

References 11 publications

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“…Finally, we note that fine structure has also been established in magnetic and spinflip resonances. High-resolution electron scattering studies in Darmstadt demonstrate the fragmentation of magnetic dipole [39,40] and quadrupole [41,42,43,44,45] modes. The Gamow-Teller resonance in heavy nuclei studied with high resolution utilizing the ( 3 He,t) reaction at RCNP again shows pronounced fine structure [46,47].…”

Section: Fine Structure Of Giant Resonances 21 Experimental Evidencementioning

confidence: 99%

Gross, intermediate and fine structure of nuclear giant resonances: Evidence for doorway states

et al. 2019

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We review the phenomenon of fine structure of nuclear giant resonances and its relation to different resonance decay mechanisms. Wavelet analysis of the experimental spectra provides quantitative information on the fine structure in terms of characteristic scales. A comparable analysis of resonance strength distributions from microscopic approaches incorporating one or several of the resonance decay mechanisms allows conclusions on the source of the fine structure. For the isoscalar giant quadrupole resonance (ISGQR), spreading through the first step of the doorway mechanism, i.e. coupling between one particle-one hole (1p1h) and two particle-two hole (2p2h) states is identified as the relevant mechanism. In heavy nuclei it is dominated by coupling to low-lying surface vibrations, while in lighter nuclei stochastic coupling becomes increasingly important. The fine structure observed for the isovector giant dipole resonance (IVGDR) arises mainly from the fragmentation of the 1p1h strength (Landau damping), although some indications for the relevance of the spreading width are also found. PACS. 25.40.Ep Inelastic proton scattering -21.10.Re Collective levels -24.30.Cz Giant resonances -21.60.Jz Nuclear Density Functional Theory and extensions

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Section: Fine Structure Of Giant Resonances 21 Experimental Evidencementioning

confidence: 99%

Gross, intermediate and fine structure of nuclear giant resonances: Evidence for doorway states

et al. 2019

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“…One can observe that the main resonant structure around 10 MeV is composed of two strong peaks. In additon, a fragmentation The experimental data on M2 excitations in 208 Pb are summarized in Table II [12,13]. If the experimental B M2 strenghts at peaks E x = 7.45, 7.50, 7.92 and 8.00 MeV from Ref.…”

Section: B M2 Transitions In 48 Camentioning

confidence: 99%

“…If the experimental B M2 strenghts at peaks E x = 7.45, 7.50, 7.92 and 8.00 MeV from Ref. [13] are summed, the result reads B M2 = (5230 ± 130)µ 2 N fm 2 . This is comparable with an earlier experimental investigation in Ref.…”

Section: B M2 Transitions In 48 Camentioning

confidence: 99%

“…However, the knowledge on higher multipole magnetic transitions, especially magnetic quadrupole (M2) transitions and respective giantquadrupole resonances (GQR) is rather limited, both from theoretical and experimental side. Several experimental studies [5][6][7][8][9][10][11][12][13][14][15][16] have elaborated highly fragmented M2 structure whose strength B M2 (E) is strongly suppressed compared to the theoretical results obtained either in shell model or random-phase approximation (RPA) [6,11,[17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Magnetic quadrupole transitions in the relativistic energy density functional theory

Kružić¹,

Oishi²,

Paar³

2022

Preprint

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Background: Magnetic quadrupole (M2) excitation represents a fundamental feature in atomic nucleus associated to nuclear magnetism induced by spin and orbital transition operator. So far it has only been investigated within the non-relativistic theoretical approaches, and available experimental data are rather limited. Purpose: We aim to investigate the properties of M2 transitions in closed and open-shell nuclei using the framework of relativistic nuclear energy density functional. The calculated M2 transition strengths could be used to constrain the quenching of the spin gyromagnetic factors. Methods: The nuclear ground state is calculated with relativistic Hartree-Bogoliubov model, while the M2 excitations are described using the relativistic quasiparticle random phase approximation (RQRPA) with the residual interaction extended with the isovector-pseudovector term. Results: The M2 transition strength distributions are described and analyzed for closed shell nuclei 16 O, 48 Ca, 208 Pb, open-shell 18 O, 42 Ca, 56 Fe, and semi-magic 90 Zr. Detailed analysis of pronounced peaks for magic nuclei provides evidence for their collectivity. The results are compared with available experimental data and the strength missing from the experiment is discussed. The evolution of M2 transition properties has been investigated within the 36−64 Ca isotope chain. Conclusion:The results showed that M2 transitions in nuclei contribute to a collective mode of excitation, with rich underlying structure, and its strength distribution is rather fragmented.Pairing correlations in open shell nuclei have strong effect, causing the M2 strength reduction and shifting of the centroid energies to higher values. The analysis of M2 transition strengths indicate that considerable amount of experimental strength may be missing, mainly due to limitations to rather restricted energy ranges. The calculated M2 strengths for Ca isotopes, together with the future experimental data will allow constraining the quenching of the g-factors in nuclear medium.

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Localized Dipole and Quadrupole Radiation Strengths in 208Pb

Raman

1979

Neutron Capture Gamma-Ray Spectroscopy

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High-resolution inelastic electron scattering on 208 Pb at 50 and 63.5 MeV and fragmentation of the magnetic quadrupole strength

Cited by 32 publications

References 11 publications

Gross, intermediate and fine structure of nuclear giant resonances: Evidence for doorway states

Gross, intermediate and fine structure of nuclear giant resonances: Evidence for doorway states

Magnetic quadrupole transitions in the relativistic energy density functional theory

Localized Dipole and Quadrupole Radiation Strengths in 208Pb

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