Electron scattering from levels in 208Pb with excitation energies up to 6.2 MeV and spins up to J = 10

Friedrich, J.; Voegler, N.; Euteneuer, H.

doi:10.1016/0370-2693(76)90198-2

Cited by 24 publications

(18 citation statements)

References 7 publications

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“…Furthermore, inspired by the surprisingly good agreement in 2o5 Pb * Visitor from Institut de Physique Nucl~aire, Orsay, France between experiments and calculations using empirical single-particle energies (Z~ as well as two-particle interactions (Z~ whenever available, we were interested in checking the nuclear shell model in a four-particle case for which the relevant nuclear masses are known with high precision (maximum total mass errors ~ 5 keV). They also appear in many high-spin states observed in nuclei around 2~ The 7 , 8 + and 10 + states are reported in inelastic scattering of protons [4] and electrons [5,6] and in these cases J~ is assigned from measurements on angular distribution of particles. However, in 2~ there must also exist high-spin particle-hole states many of which have not been observed so far.…”

Section: Introductionmentioning

confidence: 98%

On the yrast levels in204Pb

Lindén¹,

Bergström²,

Blomqvist³

et al. 1978

Z Physik A

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High-spin states in 2~were populated in the 2~ 4n) reaction using e-particles in the energy region 42-51 MeV. Prompt and delayed y-rays as well as conversion electrons were studied in addition to excitation functions, angular distributions and 7-7 coincidences. In this way a stretched cascade of y-rays from a level at 8125.9 keV was found to feed the previously known isomeric 9-level at 2185.7 keV. Spins and parities were established for levels up to and including a 19-level at 6098.0 keV. The levels with J== 17-and 19-at excitation energies of 5664.3 and 6098.0 keV are likely to be due to the simple p~/1 i~z and f5721 ii-~2 configurations. The agreement between calculated and experimental energies for all observed levels in the region J=9-19 is very good in cases where the empirical two-particle interactions used are satisfactorily well known. Above the 19-level there are three weakly populated levels at 7402.1, 7849.2 and 8125.9 keV, which are likely to have J > 20. None of these energies agrees with the calculated value 7695 +20 keV for the 20 + state of the ila~2 configuration which has the highest angular momentum produced by the four valence neutron holes. This apparent anomaly can be understood if the yrast levels with J > 20 have angular momentum contribution from the core. It seems likely that the states at 7402.1, 7849.2 and 8125.9 keV are due to proton core excited states of the type Irh9/2 h11~/zXVp~/2 i1~/2 with J==20 + and J==21 + and =h9/2 h;11/2 x vpT/1 f57~ i~32/2 with J==22 + or 23 +, respectively. The state at 8126keV has the highest energy so far directly observed in a stretched cascade of y-rays from the decay of a heavy nucleus produced in (e, x n) reactions.

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Section: Introductionmentioning

confidence: 98%

On the yrast levels in204Pb

Lindén¹,

Bergström²,

Blomqvist³

et al. 1978

Z Physik A

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“…As the first example, we have investigated doubly magic nucleus 16 O, using the RRPA with DD-PC1 [49] interaction. Figure 1 shows the corresponding M2 transition strength distribution, including…”

Section: Resultsmentioning

confidence: 99%

“…In order to investigate the M2 strength distribution for 16 O in more details, in Fig. 2 the discrete RRPA spectrum for the isovector response is shown.…”

Section: Resultsmentioning

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%

“…II A. The results for quadrupole magnetic transitions in specified nuclear systems 16 O, 48 Ca and 208 Pb, as well as Ca isotope chain are presented in Sec. III.…”

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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High-spin selectivity of heavy-ion compound reactions

Klapdor

Nuclear Interactions

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Electron scattering from levels in 208Pb with excitation energies up to 6.2 MeV and spins up to J = 10

Cited by 24 publications

References 7 publications

On the yrast levels in204Pb

On the yrast levels in204Pb

Magnetic quadrupole transitions in the relativistic energy density functional theory

High-spin selectivity of heavy-ion compound reactions

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