Total non-elastic cross sections of neutrons on C, O, Ca, and Fe at 40.3 and 50.4 MeV

Zanelli, Claudio I.; Urone, Paul Peter; Romero, J. L.; Brady, F.P.; Johnson, Mark L.; Needham, G.A.; Ullmann, J. L.; Johnson, D.L.

doi:10.1103/physrevc.23.1015

Cited by 31 publications

(20 citation statements)

References 20 publications

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“…As shown in Fig. 13, the calculated nonelastic cross sections by GS2 is in reasonable agreement with the experimental data [45,[74][75][76] for the incident energy below 55 MeV, where for the higher energies, the calculated magnitudes are larger than the experimental data. And the calculated result by GS2 is better in fitting the experimental data than those by Ska and SII.…”

Section: Results and Analysessupporting

confidence: 80%

Isospin dependent nucleon-nucleus optical potential with Skyrme interactions

2009

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In this paper, the isospin dependent nucleon-nucleus optical potential theory is introduced on the basis of the effective Skyrme interactions. From the view of the many-body theory, the nucleon optical potential can be identified with the mass operator of the one-particle Green function. The first and second order mass operators of the one particle Green function in nuclear matter are derived, and the real and imaginary parts of the optical potential for finite nuclei are obtained as usual by applying a local density approximation. Our results, in most cases, can be derived and expressed analytically. From an extensive comparison with experimental data of various quantities of interests, it is concluded that for certain versions of Skyrme interactions without parameter adjusting the agreement between theory and experiments can be obtained satisfactorily. We define the ratio of the difference and summation of the neutron and proton nonelastic cross sections as the isospin effect value. The calculated results show that the isopin effect value decreases as the incident energy increases and increases as the asymmetric parameter α 0 = (N -Z)/A of the target nucleus increases.

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Section: Results and Analysessupporting

confidence: 80%

Isospin dependent nucleon-nucleus optical potential with Skyrme interactions

2009

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“…[24] and for the n+ 40 Ca reaction from Ref. [25]. Again, only for the p+ 40 Ca reaction are there data above 50 MeV.…”

Section: Data Setsmentioning

confidence: 97%

Dispersive-optical-model analysis of the asymmetry dependence of correlations in Ca isotopes

et al. 2007

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A dispersive-optical-model analysis of p+ 40,42,44,48 Ca and n+ 40 Ca interactions has been carried out. The real and imaginary potentials have been constrained by fitting elastic-scattering data, total and reaction cross sections, and level properties of valence hole states deduced from (e, e p) data. The resulting surface imaginary potential increases with asymmetry for protons, implying that in heavier Ca isotopes, protons experience stronger long-range correlations. Presently, there is not enough data for neutrons to determine their asymmetry dependence. Global optical-model fits usually assume that the neutron asymmetry dependence is equal in magnitude, but opposite in sign, to that for protons. Such a dependence was found to give unphysical results for heavy Ca isotopes. The dispersive optical model is shown to be a useful tool for data-driven extrapolations to the drip lines. Neutron and proton data at larger asymmetries are needed to achieve more reliable extrapolations. The present analysis predicts 60 Ca and 70 Ca to be bound, while the intermediate isotopes are not.

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“…The data situation for carbon is better than for most elements and is exemplified in Fig. 3, where the data up to 100 MeV have uncertainties on the order of 10% and there are no data between 100 and 375 MeV [19][20][21][22][23][24][25]. For these reaction cross section data, the gaps must be interpolated via nuclear model calculations.…”

Section: Non-elastic Cross Sectionsmentioning

confidence: 99%

“…3. Neutron non-elastic cross section data above 20 MeV [19][20][21][22][23][24][25]. The uncertainties are typically 10% or larger.…”

Section: Non-elastic Cross Sectionsmentioning

confidence: 99%

Medium energy neutron and proton nuclear data for therapy

Haight¹

2001

Radiochimica Acta

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The range and status of nuclear data on the interaction of medium-energy neutrons and protons with biomedical materials are discussed. Microscopic data (cross sections) include results of experimental measurements, indices and compilations of such data, and evaluated data. Experimental data, while usually available only in partial ranges of interest, are essential for validating and normalizing nuclear models used to produce comprehensive evaluated data libraries. Integral measurements of radiation transport such as depth-dose curves and of KERMA coefficients test the data and their application in transport calculations.

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Total non-elastic cross sections of neutrons on C, O, Ca, and Fe at 40.3 and 50.4 MeV

Cited by 31 publications

References 20 publications

Isospin dependent nucleon-nucleus optical potential with Skyrme interactions

Isospin dependent nucleon-nucleus optical potential with Skyrme interactions

Dispersive-optical-model analysis of the asymmetry dependence of correlations in Ca isotopes

Medium energy neutron and proton nuclear data for therapy

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