Identification of a 3+ state in Ni60 with three phonon characteristics

Patter, D.M. Van; Mohindra, R.K.

doi:10.1016/0031-9163(64)91082-0

Cited by 12 publications

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“…Such states have two possible modes of electromagnetic de-excitation-either directly to the ground state or by a two-stage decay through the 2 + first excited state (2i + ). It is a striking experimental 20,34 property of Ni 60 and Ni 62 that the crossover transition 2 2 + -»0i + is strongly inhibited. Table VI shows that the model wave functions successfully reproduce this property of the measured branching ratios.…”

Section: Electromagnetic Properties Of the Ni Isotopesmentioning

confidence: 99%

“…The necessary experimental level energies are given in Tables I and II, which include results from several groups of workers. [13][14][15][16][17][18][19][20][21][22][23] The resulting best-fit interaction provides a satisfactory description of the low-lying spectra of the Ni isotopes; the rms deviation between the measured and calculated values of the 24 fitted level energies is about 150 keV. A detailed comparison between theory and experiment is postponed to Sec.…”

Section: The Effective Two-body Interactionmentioning

confidence: 99%

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Shell Model of the Nickel Isotopes

et al. 1967

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The isotopes of nickel are described by a shell model within the identical-nucleon configurations (2pz/2,lfb/2,2pi/2) n . A least-squares fit to observed level energies yields an effective interaction which satisfactorily reproduces the level structure of the Ni isotopes from Ni 58 to Ni 65 . This best-fit interaction is shown to indicate repulsive interactions between identical-nucleon shells and to conserve seniority to a useful degree of approximation. The interaction matrix elements are in fair agreement with those of an approximate reaction matrix computed by Kuo from Hamada and Johnston's free-nucleon interaction, this agreement being obtained only when core polarization is taken into account. Moments and transitions also show the strong influence of core excitation. Observed quadrupole moments and E2 transition rates are adequately reproduced with an effective neutron charge of between 1.5e and 2e; in particular, the observed inhibition of the crossover ground-state decay of the second 2 + (2 2 + ) states of Ni 60 and Ni 62 is reproduced with 2 2 + wave functions for which a two-phonon vibrational description is clearly incorrect. It is shown that the original model cannot account for the large deviations of observed magnetic moments from the Schmidt values, nor for the observed spreading of stripping strength into a given orbit over several states of the residual nucleus. To account for these, it is necessary to introduce effective transition operators, strongly modified by the influence of neglected configurations.

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Section: Electromagnetic Properties Of the Ni Isotopesmentioning

confidence: 99%