Statybinių nerūdinių medžiagų gavyba, perdirbimas ir naudojimas

Deltuva, Juozas; Vaitkevičius, Vitoldas

doi:10.5755/e01.9786090208670

Cited by 6 publications

(9 citation statements)

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“…Studies benchmarking various methods have exposed serious limitations in even the most advanced approaches [6][7][8][9]. Although the methodology for accurately solving the three-body scattering problem is under intense research, there are at least two less-tractable sources of uncertainty in the calculation of transfer reaction observables, namely the reduction of the many-body problem to a three-body problem and the uncertainties in the effective interactions introduced as a consequence of that reduction [10].…”

Section: Introductionmentioning

confidence: 99%

Effects of nonlocal potentials on(p,d)transfer reactions

et al. 2015

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Background: Although local phenomenological optical potentials have been standardly used to interpret nuclear reactions, recent studies suggest the effects of non-locality should not be neglected. Purpose: In this work we investigate the effects of non-locality in (p, d) transfer reactions using non-local optical potentials. We compare results obtained with the dispersive optical model to those obtained using the Perey-Buck interaction. Method: We solved the scattering and bound-state equations for the non-local version of the dispersive optical model. Then, using the distorted wave Born approximation, we calculate the transfer cross section for (p, d) on 40 Ca at Ep=20, 35 and 50 MeV. Results: The inclusion of non-locality in the bound state has a larger effect than on the scattering states. The overall effect on the transfer cross section is very significant. We found an increase due to non-locality in the transfer cross section of ≈ 30 − 50% when using the Perey-Buck interaction and ≈ 15 − 50% when using the dispersive optical potential. Conclusions: Although the details of the non-local interaction can change the magnitude of the effects, our study shows that qualitatively the results obtained using the dispersive optical potential and the Perey-Buck interaction are consistent, in both cases the transfer cross sections are significantly increased.

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Section: Introductionmentioning

confidence: 99%

Effects of nonlocal potentials on(p,d)transfer reactions

et al. 2015

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“…For evaluating the neutron-nucleus form factors in the Coulomb basis, we start from the separable partial-wave t-matrix operator given in Eq. (7). Evaluating its momentum space matrix elements p|t l (E)|p ′ in a plane-wave basis gives the nuclear form factors…”

Section: Coulomb Distorted Neutron-nucleus Form Factorsmentioning

confidence: 99%

“…Over the last decade, many theoretical efforts have focused on advancing the theory for (d, p) reactions (e.g. [6,7]) and testing existing methods (e.g. [4,8,9]).…”

Section: Introductionmentioning

confidence: 99%

Separable Potentials for (d,p) Reaction Calculations

Elster

Hlophe

Eremenko

et al. 2016

J. Phys.: Conf. Ser.

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An important ingredient for applications of nuclear physics to e.g. astrophysics or nuclear energy are the cross sections for reactions of neutrons with rare isotopes. Since direct measurements are often not possible, indirect methods like (d, p) reactions must be used instead. Those (d, p) reactions may be viewed as effective three-body reactions and described with Faddeev techniques. An additional challenge posed by (d, p) reactions involving heavier nuclei is the treatment of the Coulomb force. To avoid numerical complications in dealing with the screening of the Coulomb force, recently a new approach using the Coulomb distorted basis in momentum space was suggested. In order to implement this suggestion, one needs not only to derive a separable representation of neutron-and proton-nucleus optical potentials, but also compute the Coulomb distorted form factors in this basis.

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“…Using this type of correction, however, does not eliminate all background as the background does vary across the piece of CR-39. To allow for accurate correction for neutron-induced background, the background was experimentally established on a NULL shot (N130628, YDT=1.610 15 ) where MRS was fielded without a conversion foil. The background correction as determined on N130628 is now routinely applied to the MRS spectrum.…”

Section: Neutron Backgroundmentioning

confidence: 99%

“…(The validity of this approach is confirmed by the YDD/YDT ratios measured on the five SymCaps studied, which are in agreement with the values expected based on reactivities.) The DT-fuel component used to give DT fuel R was calculated on the basis of n,D, D(n,2n) 15 , n,T, 16 and T(n,2n) cross-sections, scaled for simulated emission profile effects 17 , and the CH-ablator component used to give CH-ablator R was calculated using MCNPX for an implosion with 440 mg/cm 2 CH-ablator R, Tion=2.9 keV and SymCap-like geometry, to account for multiscatter and profile effects. From the spectrum shown in Fig.…”

Section: Fig 2 (Color Online) (A) Reduced Mrs Spectrum For Shot N1mentioning

confidence: 99%

Measurements of fuel and ablator ρR in Symmetry-Capsule implosions with the Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility

Johnson

Frenje

et al. 2014

Review of Scientific Instruments

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The Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility (NIF) measures the neutron spectrum in the energy range of 4-20 MeV. This paper describes MRS measurements of DT-fuel and CH-ablator R in DT gas-filled Symmetry-Capsule implosions at the NIF. DT-fuel R's of 80-140 mg/cm 2 and CH-ablator R's of 400-680 mg/cm 2 are inferred from MRS data. The measurements were facilitated by an improved correction of neutron-induced background in the low-energy part of the MRS spectrum. This work demonstrates the accurate utilization of the complete MRS-measured neutron spectrum for diagnosing NIF DT implosions.

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Statybinių nerūdinių medžiagų gavyba, perdirbimas ir naudojimas

Cited by 6 publications

References 0 publications

Effects of nonlocal potentials on(p,d)transfer reactions

Effects of nonlocal potentials on(p,d)transfer reactions

Separable Potentials for (d,p) Reaction Calculations

Measurements of fuel and ablator ρR in Symmetry-Capsule implosions with the Magnetic Recoil neutron Spectrometer (MRS) on the National Ignition Facility

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