1961 nuclidic mass table

Konig, Luca; Mattauch, J.; Wapstra, A.H.

doi:10.1016/0029-5582(62)90726-5

Cited by 205 publications

(8 citation statements)

References 5 publications

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“…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%

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: The Effective Two-body Interactionmentioning

confidence: 99%

Shell Model of the Nickel Isotopes

et al. 1967

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“…These differences were calculated for proton and neutron systems from results of each of the thre~ methods, BCS, PBCS, and FBCS. .The experi.mental differences for comparison were done in similar fashion, using experimental masses of Kl:3nig,,22 Mattauch, and Wapstra with some adjustment (cf. Appendix A).…”

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confidence: 99%

Nuclear structure and pairing correlations for the heavy elements

1965

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“…In mass 20 a different situation holds: Using the lowest T = 1 level in Ne 20 and adding to it the Coulomb-energy difference obtained from Na 21 -Ne 21 corrected for radius to get a value of the Na 20 ground state, one obtains Na 20 -Ne 20 = 13.86, which is in very substantial disagreement with both the prediction in the paragraph above and the value currently accepted for this mass difference. 5 Considering the magnitude of the disagreement it seems that the current value for the mass of Na 20 is too high by at least 1 MeV. It should be noted that it has only been reported once, 11 and therefore certainly should be remeasured.…”

Section: M(att ) = A(at) + B(at)t +C(at)tmentioning

confidence: 91%

Energies of Isobaric Multiplets inA=16 and 20

1964

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If the specifically nuclear part of nuclear interactions is charge independent then the energies of the various members of an isobaric multiplet will differ only because of the neutron-proton mass difference and the electromagnetic interactions among the protons. These electromagnetic contributions are calculable 1 and could be removed; the remaining masses of the multiplets thus could be examined with regard to charge independence in nuclear forces. These calculations, however, are somewhat model dependent, but to first order in the Coulomb energy it has been shown, 2 quite generally, that the masses within an isobaric multiplet are characterized by M(A,T,T ) = a(A,T) + b(A,T)T +c(A,T)Twhere M is the mass of a member of the multiplet, A is the number of nucleons, T is the isobaric spin, and T z = |(AT-Z); a(A,T), b(A,T), and c{A,T) are taken as constants within a given multiplet. The adequacy of this formula has never been tested empirically because at most three members of a multiplet are known so that no verifiable predictions can be made using Eq. (1).Recent (p,t) experiments, 3 however, have been able to find a T = 2 level in certain T z = 0 nuclei. The T = 2 level that is located is the isobaric analog of the ground state of the T = 2, T z = 2 isobar. For example, a T = 2 level is found in Mg 24 that is the analog to the ground state of Ne 24 . In the mass-24 system the three lowest lying T = 1 levels with T z = 0, ±1 are also known. In a recent paper 4 Wilkinson suggested that one assume the coefficients b{A,T) and c(A,T) within the same A be taken to be T independent. With this assumption, using the levels mentioned above he was able to show that the resulting prediction for the mass of the ground state of Al 24 is in agreement with the observed mass, 5 though the experimental uncertainties are large.We have just completed a study 6 of (p,t) and (£,He 3 ) reactions on O 18 and Ne 22 . These reac-tions on O 18 allowed us to locate the analog to the ground state of C 16 in N 16 (9.91 ±0.

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1961 nuclidic mass table

Cited by 205 publications

References 5 publications

Shell Model of the Nickel Isotopes

Shell Model of the Nickel Isotopes

Nuclear structure and pairing correlations for the heavy elements

Energies of Isobaric Multiplets inA=16 and 20

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