Valence nucleon populations in the Ni isotopes

Schiffer, J. P.; Hoffman, C. R.; Kay, B. P.; Clark, J. A.; Deibel, C. M.; Freeman, S. J.; Honma, Michio; Howard, Alan; Mitchell, A. J.; Otsuka, T.; Parker, P. D.; Sharp, D. K.; Thomas, J. S.

doi:10.1103/physrevc.87.034306

Cited by 61 publications

(37 citation statements)

References 28 publications

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“…It was found [2][3][4] that this procedure gave consistent and very similar normalizations for groups of nearby target nuclei. In the present Letter we focus our attention on the value of this normalization and extend our analysis to include reaction data on targets 16 ≤ A ≤ 208.…”

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confidence: 83%

“…In recent work [2,3] the quantitative consistency of nucleon transfer -in particular, the reduction of experimental cross sections using the distorted-wave Born approximation (DWBA) -was investigated using cross sections from nucleon-transfer reactions on the stable Ni isotopes. According to the Macfarlane-French sum rules [1], the summed spectroscopic strengths, including both adding and removing on a given target, must be equal to the degeneracy of the orbit in question.…”

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confidence: 99%

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Quenching of Cross Sections in Nucleon Transfer Reactions

2013

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Cross sections for proton knockout observed in (e,e'p) reactions are apparently quenched by a factor of ∼0.5, an effect attributed to short-range correlations between nucleons. Here we demonstrate that such quenching is not restricted to proton knockout, but a more general phenomenon associated with any nucleon transfer. Measurements of absolute cross sections on a number of targets between 16O and 208Pb were analyzed in a consistent way, with the cross sections reduced to spectroscopic factors through the distorted-wave Born approximation with global optical potentials. Across the 124 cases analyzed here, induced by various proton- and neutron-transfer reactions and with angular momentum transfer ℓ=0-7, the results are consistent with a quenching factor of 0.55. This is an apparently uniform quenching of single-particle motion in the nuclear medium. The effect is seen not only in (d,p) reactions but also in reactions with A=3 and 4 projectiles, when realistic wave functions are used for the projectiles.

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confidence: 83%

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confidence: 99%

Quenching of Cross Sections in Nucleon Transfer Reactions

2013

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“…The same value is obtained for 67 Ni assuming that all levels not characterized by spin above 3 MeV are = 2 transfer. As the influence of the N = 40 shell gap swiftly disappears when moving towards lower Z values, one expects a strong influence of quadrupole correlations in the (s)dg orbitals as observed through the enhanced collectivity in the Fe and Cr nuclei at N = 40 [13,37,38]. The weighted average of the energy of the νs 1/2 configuration follows closely the one of the νd 5/2 orbital.…”

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confidence: 64%

Study of the deformation-drivingνd5/2orbital in 67 28 Ni 39 using one-neutron transfer reactions

et al. 2014

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The νg 9/2 , d 5/2 , s 1/2 orbitals are assumed to be responsible for the swift onset of collectivity observed in the region below 68 Ni. Especially the single-particle energies and strengths of these orbitals are of importance. We studied such properties in the nearby 67 Ni nucleus, by performing a (d, p)-experiment in inverse kinematics employing a post-accelerated radioactive ion beam (RIB) at the REX-ISOLDE facility. The experiment was performed at an energy of 2.95 MeV/u using a combination of the T-REX particle detectors, the Miniball γ -detection array and a newly-developed delayed-correlation technique as to investigate μs-isomers. Angular distributions of the ground state and multiple excited states in 67 Ni were obtained and compared with DWBA cross-section calculations, leading to the identification of positive-parity states with substantial νg 9/2 (1007 keV) and νd 5/2 (2207 keV and 3277 keV) singleparticle strengths up to an excitation energy of 5.8 MeV. 50% of the νd 5/2 single-particle strength relative to the νg 9/2 -orbital is concentrated in and shared between the first two observed 5/2 + levels.A comparison with extended Shell Model calculations and equivalent ( 3 He, d) studies in the region around 90 40 Zr 50 highlights similarities for the strength of the negative-parity pf and positive-parity g 9/2 state, but differences are observed for the d 5/2 single-particle strength.

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“…Consistent results have been obtained by adopting systematic approaches (for example, Ref. [8,9]) using the Macfarlane-French sum rules [40] which associate the summed spectroscopic strengths to the occupancies and vacancies of single-nucleon orbitals. If a normalization factor is chosen such that the total observed strength is equal to the full single-particle value, the degree to which that factor deviates from unity is related to quenching of single-particle strength.…”

Section: Dwba and Normalizationmentioning

confidence: 53%

“…Several studies have been performed recently using consistent approaches to both experimental and analytical methods that have highlighted the detailed trends in single-particle orbitals in near stable nuclei. These include studies of high-j proton states outside of stable Sn cores [4]; untangling particle-vibration coupling to reveal the underlying neutron orbitals outside N = 82 isotones [5,6]; single-neutron states in N = 51 nuclei [7]; and a detailed study of the single-particle properties in Ni isotopes [8,9]. This paper focusses on a systematic study of hole states in the N = 82 closed core.…”

Section: Introductionmentioning

confidence: 99%

Neutron-hole strength in N=81 nuclei

et al. 2020

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A systematic study of neutron-hole strength in the N = 81 nuclei 137 Ba, 139 Ce, 141 Nd and 143 Sm is reported. The single-neutron removal reactions (p,d) and ( 3 He,α) were measured at energies of 23 and 34 MeV, respectively. Spectroscopic factors were extracted from measured cross sections through a distorted-wave Born approximation analysis and centroids of single-particle strength have been established. The change in these centroid energies as a function of proton number have been compared to calculations of the monopole shift for the s 1/2 and h 11/2 orbitals, where the majority of the strength has been observed. Significant fragmentation of strength was observed for the d and g 7/2 orbitals, particularly for the latter orbital which is deeply bound, with summed strengths that indicate a significant amount lies outside of the measured excitation energy range. *

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Valence nucleon populations in the Ni isotopes

Cited by 61 publications

References 28 publications

Quenching of Cross Sections in Nucleon Transfer Reactions

Quenching of Cross Sections in Nucleon Transfer Reactions

Study of the deformation-drivingνd5/2orbital in 67 28 Ni 39 using one-neutron transfer reactions

Neutron-hole strength in N=81 nuclei

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