Neutron-Proton Asymmetry Dependence of Spectroscopic Factors in Ar Isotopes

Lee, Jenny; Tsang, M. B.; Bazin, D.; Coupland, D.; Henzl, V.; Henzlová, D.; Kilburn, M.; Lynch, W. G.; Rogers, A. M.; Sanetullaev, A.; Signoracci, A.; Sun, Z.; Youngs, M.; Chae, K. Y.; Charity, R. J.; Cheung, Him; Famiano, M.; Hudan, S.; O’Malley, P. D.; Peters, William A.; Schmitt, K. T.; Shapira, D.; Sobotka, L. G.

doi:10.1103/physrevlett.104.112701

Cited by 111 publications

(103 citation statements)

References 30 publications

(36 reference statements)

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“…18 have been partly obscured by the fluctuations due to the different ℓ values of the various valence levels and by the chosen abscissa coordinates. Our results are consistent with the much weaker ∆E sep trend obtained recently by Lee et al using transfer reactions [12]. Microscopic calculations based on the Faddeev random phase approximation also do not generate a very pronounced separation-energy dependence when neutron-rich nuclei are considered [18].…”

Section: Spectroscopic Factorssupporting

confidence: 92%

“…The extreme example is for 32 Ar, where the 0d 5/2 valence neutron hole level has a spectroscopic factor of about 16% of the IPM value. More recent measurements of transfer reactions generate spectroscopic factors that are in contradiction with these results [12] and indicate only a small or moderate dependence on nucleon asymmetry.…”

Section: Introductionmentioning

confidence: 72%

“…We point again to the present uncertainty of at least 30% based on the choice of the optical potential used in the analysis of the (d, p) transfer reactions [12] as a case in point. We also note that in the adiabatic wave approximation [16] employed for the analysis of this reaction, proton and neutron optical potentials are used at half the deuteron energy to describe the deuteron distorted wave, as well as overlap functions for the added or removed neutron.…”

Section: Introductionmentioning

confidence: 83%

“…In view of the present disagreement between the interpretation of the transfer and knockout measurements, it is important to identify methods that can uniquely determine correlation effects exhibited for example by spectroscopic factors, as well as identify the origin of the implied correlations. This issue is already conspicuous because spectroscopic factors derived from different optical potentials in the analysis of transfer reactions generate differences as large as 30%, although the asymmetry dependence is similar [12]. Information about correlations is contained in the nucleon self-energy which is a non-local and energydependent one-body potential that determines the nucleon single-particle propagator from the Dyson equation [13].…”

Section: Introductionmentioning

confidence: 99%

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Asymmetry dependence of nucleon correlations in spherical nuclei extracted from a dispersive-optical-model analysis

et al. 2011

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Neutron elastic-scattering angular distributions were measured at beam energies of 11.9 and 16.9 MeV on 40,48 Ca targets. These data plus other elastic-scattering measurements, total and reaction cross sections measurements, (e, e ′ p) data, and single-particle energies for magic and doubly magic nuclei have been analyzed in the dispersive optical model (DOM) generating nucleon self-energies (optical-model potentials) which can be related, via the many-body Dyson equation, to spectroscopioc factors and occupation probabilities. It is found that for stable nuclei with N ≥ Z, the imaginary surface potential for protons exhibits a strong dependence on the neutron-proton asymmetry. This result leads to a more modest dependence of the spectroscopic factors on asymmetry. The measured data and the DOM analysis of all considered nuclei clearly demonstrates that the neutron imaginary surface potential displays very little dependence on the neutron-proton asymmetry for nuclei near stability (N ≥ Z).

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Section: Spectroscopic Factorssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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Asymmetry dependence of nucleon correlations in spherical nuclei extracted from a dispersive-optical-model analysis

et al. 2011

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“…Corresponding small reduction factors have also been extracted from heavy-ion knockout reactions for minority nucleons while the majority species appears to require almost no reduction [13,12]. Transfer reactions appear to suggest a considerably smaller dependence of correlations on nucleon asymmetry [21,11] which is also suggested by FRPA ab initio calculations [1]. We illustrate the DOM extrapolation in Fig.…”

Section: Sn Isotopesmentioning

confidence: 96%

Isospin dependence of nucleon correlations in ground-state nuclei

et al. 2014

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Abstract. The dispersive optical model (DOM) as presently implemented can investigate the isospin (nucleon asymmetry) dependence of the Hartree-Fock-like potential relevant for nucleons near the Fermi energy. Data constraints indicate that a Lane-type potential adequately describes its asymmetry dependence. Correlations beyond the mean-field can also be described in this framework, but this requires an extension that treats the non-locality of the Hartree-Fock-like potential properly. The DOM has therefore been extended to properly describe ground-state properties of nuclei as a function of nucleon asymmetry in addition to standard ingredients like elastic nucleon scattering data and level structure. Predictions of nucleon correlations at larger nucleon asymmetries can then be made after data at smaller asymmetries constrain the potentials that represent the nucleon self-energy. A simple extrapolation for Sn isotopes generates predictions for increasing correlations of minority protons with increasing neutron number. Such predictions can be investigated by performing experiments with exotic beams. The predicted neutron properties for the double closed-shell 132 Sn nucleus exhibit similar correlations as those in 208 Pb. Future relevance of these studies for understanding the properties of all nucleons, including those with high momentum, and the role of three-body forces in nuclei are briefly discussed. Such an implementation will require a proper treatment of the non-locality of the imaginary part of the potentials and a description of high-momentum nucleons as experimentally constrained by the (e, e ′ p) reactions performed at Jefferson Lab.PACS. 21.10.Pc Single-particle levels and strength functions -24.10.Cn Many-body theory -24.10.Ht Optical and diffraction models -11.55.Fv Dispersion relations -27.60.+j 90 ≤ A ≤ 149

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Nuclear Reactions

Sobotka¹,

Viola²

2011

Handbook of Nuclear Chemistry

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Neutron-Proton Asymmetry Dependence of Spectroscopic Factors in Ar Isotopes

Cited by 111 publications

References 30 publications

Asymmetry dependence of nucleon correlations in spherical nuclei extracted from a dispersive-optical-model analysis

Asymmetry dependence of nucleon correlations in spherical nuclei extracted from a dispersive-optical-model analysis

Isospin dependence of nucleon correlations in ground-state nuclei

Nuclear Reactions

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