Jastrow-type calculations of one-nucleon removal reactions on open<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi><mml:mo>−</mml:mo><mml:mi>d</mml:mi></mml:math>shell nuclei

Gaidarov, M. K.; Pavlova, K. A.; Antonov, A. N.; Giusti, C.; Massen, S. E.; Moustakidis, Ch. C.; Spasova, K.

doi:10.1103/physrevc.66.064308

Cited by 5 publications

(1 citation statement)

References 43 publications

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“…The more recent Koning and Delaroche parametrization [37] does cover this energy-regime but we are not aware of its use for these reactions. An alternative high-energy parametrization [80-180 MeV, 24≤ A ≤ 208] by Schwandt et al [24] has been used extensively for DWIA calculations of (e, e p) and some (p,2p) reactions [198,199,200,201,202,203,204,205,206,207,208]. As for transfer reactions, the extracted spectroscopic factor are sensitive to the choice of the optical-model parameters.…”

Section: Nucleon Knockout With Electrons and Proton Beamsmentioning

confidence: 99%

Recent developments for the optical model of nuclei

Dickhoff¹,

Charity²

2019

Progress in Particle and Nuclear Physics

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A brief overview of various approaches to the optical-model description of nuclei is presented. A survey of some of the formal aspects is given which links the Feshbach formulation for either the hole or particle Green's function to the time-ordered quantity of many-body theory. The link between the reducible self-energy and the elastic nucleon-nucleus scattering amplitude is also presented using the development of Villars. A brief summary of the essential elements of the multiple-scattering approach is also included. Several ingredients contained in the time-ordered Green's function are summarized for the formal framework of the dispersive optical model (DOM). Empirical approaches to the optical potential are reviewed with emphasis on the latest global parametrizations for nucleons and composites. Various calculations that start from an underlying realistic nucleon-nucleon interaction are discussed with emphasis on more recent work. The efficacy of the DOM is illustrated in relating nuclear structure and nuclear reaction information. Its use as an intermediate between experimental data and theoretical calculations is advocated. Applications of the use of optical models are pointed out in the context of the description of nuclear reactions other than elastic nucleon-nucleus scattering. arXiv:1811.03111v1 [nucl-th] 7 Nov 2018The number of works that are encompassed by the title of "optical model" is immense and any review must be selective. The topics and studies present in this review are biased by the interests of the authors. We start with several theoretical derivations of the optical potential and its connection to the self-energy in many-body formulations in Sec. 2. In Sec. 2.1 the analysis of Capuzzi and Mahaux [6] will be employed to link the Feshbach approach to the many-body perspective provided by the time-ordered Green's function. We complement this in Sec. 2.2 with a derivation by Villars [7] that formalizes the work of Ref.[8] that demonstrates the equivalence of the nucleon-nucleus T -matrix to the on-shell reducible nucleon self-energy Σ red associated with the time-ordered Green's function. This approach is important as it can be extended to the description of more complicated reactions involving composite projectiles or ejectiles. In Sec. 2.3 we briefly summarize some elements of the multiple-scattering approach but refrain from a detailed presentation which is available in Ref. [9]. We will take particular interest in the empirical dispersive optical model (DOM) where the real and imaginary potentials are connected by dispersion relations thereby enforcing causality. This approach allows one to exploit the formal properties of the time-ordered Green's function including its link to the nucleon self-energy through the Dyson equation [10,11]. As the dispersion relations require the optical potentials to be defined at both positive and negative energy, the formalism makes connections between nuclear reactions and nuclear structure needed for a better understanding of rare isotopes. Some ingredients...

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Section: Nucleon Knockout With Electrons and Proton Beamsmentioning

confidence: 99%

Recent developments for the optical model of nuclei

Dickhoff¹,

Charity²

2019

Progress in Particle and Nuclear Physics

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The (e, e′p) reaction on nuclei

Giusti

2005

Nuclear Physics B - Proceedings Supplements

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Effect of La substitution for Gd in the ionic conductivity and oxygen dynamics of fluorite-type Gd₂Zr₂O₇

Díaz-Guillén

Almanza

et al. 2007

J. Phys.: Condens. Matter

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We have prepared different compositions in the Gd 2−y La y Zr 2 O 7 solid solution by mechanically milling stoichiometric mixtures of the corresponding oxides. Irrespective of their lanthanum content, as-prepared powder samples consist of single-phase anion-deficient fluorite materials, although the long-range ordering of cations and anion vacancies characteristic of pyrochlores was observed for y 0.4 after post-milling thermal treatments at 1200 • C. Ionic conductivity was found to be thermally activated and almost independent of La content for 0 y 1, since the pre-exponential factor decreases as structural ordering increases; however, there is a concomitant decrease of the activation energy E dc for oxide-ion diffusion, from E dc = 1.13 ± 0.02 eV for the anion-deficient fluorite Gd 2 Zr 2 O 7 to E dc = 0.85 ± 0.03 eV for the partially ordered pyrochlore-type Gd 1.2 La 0.8 Zr 2 O 7 . Electrical conductivity relaxation is well described by a Kohlrausch-Williams-Watts (KWW) function of the form = exp(−(t/τ ) 1−n ), where the fractional exponent n decreases as the La content (ordering) increases. These results are explained in terms of weaker ion-ion interactions in the better ordered structure and highlight the importance of structural ordering/disordering in determining the dynamics of mobile oxygen ions.

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Jastrow-type calculations of one-nucleon removal reactions on opens−dshell nuclei

Cited by 5 publications

References 43 publications

Recent developments for the optical model of nuclei

Recent developments for the optical model of nuclei

The (e, e′p) reaction on nuclei

Effect of La substitution for Gd in the ionic conductivity and oxygen dynamics of fluorite-type Gd₂Zr₂O₇

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Jastrow-type calculations of one-nucleon removal reactions on opens−dshell nuclei

Cited by 5 publications

References 43 publications

Recent developments for the optical model of nuclei

Recent developments for the optical model of nuclei

The (e, e′p) reaction on nuclei

Effect of La substitution for Gd in the ionic conductivity and oxygen dynamics of fluorite-type Gd2Zr2O7

Contact Info

Product

Resources

About

Effect of La substitution for Gd in the ionic conductivity and oxygen dynamics of fluorite-type Gd₂Zr₂O₇