M2 giant resonance in light nuclei

Dogotar, G.E.; Eramzhyan, R.A.; Gmitro, M.; Kissener, H.R.; Tinkova, Eva

doi:10.1088/0305-4616/5/12/001

Cited by 4 publications

(2 citation statements)

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“…One of its main goals is the extraction of the neutron-neutron scattering length (aM). It was shown (Dosch 1965, Dogotar and Eramzhyan 1977, hire et a1 1978 that the doublet contribution to the neutron spectrum dryi2ldn dEn (E, is the neutron energy and SZ is the n-n solid angle) for the transition to the 'So neutron-neutron final state was fairly sensitive to the variation of am. The extraction of am can therefore be performed by analysing that spectrum.…”

Section: Introductionmentioning

confidence: 97%

An Experimental Model of Sled System in an Optical Disk Drive

Han

Hock²,

Li³

et al. 2000

Jpn. J. Appl. Phys.

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Section: Introductionmentioning

confidence: 97%

An Experimental Model of Sled System in an Optical Disk Drive

Han

Hock²,

Li³

et al. 2000

Jpn. J. Appl. Phys.

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“…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%

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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