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AbstractAbstract

[en] Nucleus-hydrogen scattering can be predicted using optical potentials formed by full folding effective two-nucleon interactions with detailed nuclear structure. Results when compared with measured cross sections (integral and angular) for energies in the range 25A to 250A MeV are excellent and such data analyses reveal attributes of the separate nucleon matter distributions of the nucleus involved

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Source

ISPUN 02: International symposium on physics of unstable nuclei; Halong Bay (Viet Nam); 20-25 Nov 2002; S0375947403013332; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)

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Journal Article

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Conference

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AbstractAbstract

[en] The scattering function is of paramount importance in any approaches by which quantitative information on the interaction between colliding quantal systems of nuclear, atomic or molecular type, may be sought from measured, elastic scattering data. Therein there are two possible spectral parameters, the energy and the angular momentum. Most experimental results suggest use of fixed energy and variable angular momentum schemes. Such fixed energy data and their analyses are the subject of this report, with particular emphasis placed upon the problems of the link between data and the scattering function. 18 figs

Primary Subject

Source

1995; 28 p; Dedicated to the memory of Professor Harry Fiedeldey from the University of South Africa.

Record Type

Report

Literature Type

Numerical Data

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ACCURACY, ANGULAR MOMENTUM, CARBON 12, DATA COVARIANCES, DIFFERENTIAL CROSS SECTIONS, ELASTIC SCATTERING, ELECTROMAGNETIC INTERACTIONS, EXPERIMENTAL DATA, FUNCTIONS, INVERSE SCATTERING PROBLEM, LEAD 208 TARGET, MEV RANGE 100-1000, OXYGEN 16, OXYGEN 16 TARGET, PHASE SHIFT, POTENTIAL SCATTERING, SCATTERING AMPLITUDES, SCHROEDINGER EQUATION

AMPLITUDES, BASIC INTERACTIONS, CARBON ISOTOPES, CROSS SECTIONS, DATA, DIFFERENTIAL EQUATIONS, ENERGY RANGE, EQUATIONS, EVEN-EVEN NUCLEI, INFORMATION, INTERACTIONS, ISOTOPES, LIGHT NUCLEI, MEV RANGE, NUCLEI, NUMERICAL DATA, OXYGEN ISOTOPES, PARTIAL DIFFERENTIAL EQUATIONS, SCATTERING, STABLE ISOTOPES, TARGETS, WAVE EQUATIONS

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AbstractAbstract

[en] Heavy ion scattering has been studied quite intensively in the last decade and central in most analyses of data from such experiments be they on fusion, particle transfer or internal state excitations of the colliding pair, is the inter-ion interaction affecting their relative motion. It is customary to use the elastic scattering data to constrain solutions of the (nonrelativistic) Schroedinger equation to ascertain the character of that (central and complex) heavy ion potential. These matters for projectiles ranging from the lightest 'heavy' ion, a proton, to Oxygen nuclei are considered in brief herein. The targets range from

^{12}C to^{208}Pb. The central entity in the analyses to be discussed will be the S-function, and so for completeness, the simple potential scattering theory details are presented that specify the S-function and relate it to measured cross-sections. 20 refs., 18 figsPrimary Subject

Source

1993; 33 p

Record Type

Report

Literature Type

Numerical Data

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ABSORPTION, ALGEBRA, ANGULAR MOMENTUM, CARBON 12 TARGET, COULOMB SCATTERING, DIFFERENTIAL CROSS SECTIONS, EXPERIMENTAL DATA, HEAVY ION REACTIONS, INVERSE SCATTERING PROBLEM, LEAD 208 TARGET, MEV RANGE 100-1000, NUCLEAR POTENTIAL, OXYGEN 16, PHASE SHIFT, POTENTIAL SCATTERING, PROTONS, THEORETICAL DATA, WAVE FUNCTIONS

BARYONS, BASIC INTERACTIONS, CATIONS, CHARGED PARTICLES, CROSS SECTIONS, DATA, ELASTIC SCATTERING, ELECTROMAGNETIC INTERACTIONS, ELEMENTARY PARTICLES, ENERGY RANGE, EVEN-EVEN NUCLEI, FERMIONS, FUNCTIONS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, INFORMATION, INTERACTIONS, IONS, ISOTOPES, LIGHT NUCLEI, MATHEMATICS, MEV RANGE, NUCLEAR REACTIONS, NUCLEI, NUCLEONS, NUMERICAL DATA, OXYGEN ISOTOPES, POTENTIALS, SCATTERING, SORPTION, STABLE ISOTOPES, TARGETS

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AbstractAbstract

[en] Nuclear reaction theory for (p,2p) reactions is reviewed in general to show how and what type of information about nuclear spectroscopy and nuclear reaction mechanisms (the two nucleon t-matrix in particular) is inherent in reaction data. The results of various model calculations are shown to illustrate what information has been and what information might yet be extracted from pertinent analyses of appropriate data

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Source

1980; 17 p; 10 refs.

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Report

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Dortmans, P.J.; Amos, K.

Melbourne Univ., Parkville (Australia). School of Physics

Melbourne Univ., Parkville (Australia). School of Physics

AbstractAbstract

[en] The Bethe-Goldstone equations have been solved for both negative and positive energies to specify two nucleon G-matrices fully off of the energy shell. Medium correction effects of Pauli blocking and of the auxiliary potential are included in infinite matter systems characterized by fermi momenta in the range 0.5 fm

^{-1}to 1.8 fm^{-1}. The Paris interaction is used as the starting potential in most calculations. Medium corrections are shown to be very significant over a large range of energies and densities. On the energy shell values of G-matrices vary markedly from those of free two nucleon (NN) t-matrices which have been solved by way of the Lippmann-Schwinger equation. Off of the energy shell, however, the free and medium corrected Kowalski-Noyes f-ratios rate are quite similar suggesting that a useful model of medium corrected G-matrices are appropriately scaled free NN t-matrices. The choice of auxiliary potential form is also shown to play a decisive role in the negative energy regime, especially when the saturation of nuclear matter is considered. 30 refs., 7 tabs., 7 figsPrimary Subject

Secondary Subject

Source

1990; 25 p

Record Type

Report

Literature Type

Numerical Data

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Country of publication

ANGULAR MOMENTUM OPERATORS, BARYON-BARYON INTERACTIONS, DATA, ENERGY, ENERGY LEVELS, ENERGY RANGE, EQUATIONS, HADRON-HADRON INTERACTIONS, INFORMATION, INTERACTIONS, MATHEMATICAL OPERATORS, MATRICES, MATTER, MEV RANGE, NUCLEON-NUCLEON POTENTIAL, NUMERICAL DATA, PARTICLE INTERACTIONS, POTENTIALS, QUANTUM OPERATORS

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Amos, K.; Morrison, I.

Melbourne Univ., Parkville (Australia). School of Physics

Melbourne Univ., Parkville (Australia). School of Physics

AbstractAbstract

[en] Analyses of data from the inelastic scattering of 65 MeV protons and of 135 MeV electrons are used to test large basis (projected Hartee-Fock) model spectroscopies for the ground to 2

_{1}^{+}(4.43 MeV) transition in^{12}C. From distorted wave approximation calculations of the proton scattering, reasonably good agreement with the empirical cross-section was obtained but no spectroscopy yields the distinctive structure of the recently measured analyzing power data. In like fashion, the longitudinal form factor ascertained from the electron scattering data is well produced by calculations based upon the same PHF models of spectroscopy. The predictions of the transverse form factor, however, are quite distinctive and only in one case, and that involving a strong spin orbit effect in the basis, is the data reproducedPrimary Subject

Source

1979; 20 p; 14 refs.

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Report

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BARYON REACTIONS, BARYONS, CARBON ISOTOPES, CATIONS, CHARGED PARTICLES, ELEMENTARY PARTICLES, ENERGY RANGE, EVEN-EVEN NUCLEI, FERMIONS, HADRON REACTIONS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, IONS, ISOTOPES, LEPTON REACTIONS, LIGHT NUCLEI, MATHEMATICAL MODELS, MEV RANGE, NUCLEAR MODELS, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUCLEONS, SCATTERING, STABLE ISOTOPES, TARGETS

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Amos, K.; Bauhoff, W.

Melbourne Univ., Parkville (Australia). School of Physics

Melbourne Univ., Parkville (Australia). School of Physics

AbstractAbstract

[en] Intermediate energy inelastic proton scattering differential cross section and polarization data from the 2

_{1}^{+}states in^{24}Mg and^{28}Si and from the 4_{1}^{+}states in^{28}Si have been analysed using the Distorted Wave Approximation with large basis models of nuclear structure. These structure models were tested by use in analyses of the longitudinal form factors obtained from inelastic electron scattering, so that analyses of the intermediate energy (p,p') data from the same transitions are then sensitive tests of the two-nucleon t-matrix. Data from these and other 2_{1}^{+}transitions in^{12}C and^{20}Ne at 49 MeV (24 MeV in the case of^{20}Ne), were also analysed to compare models of t-matrices at lower energies. An ancilliary study of the momentum transfer dependence of effective charges has been made as both s-d shell and large basis structure models have been used to compare with form factor data up to momentum transfers of 2.5 fm^{-1}. The deduced momentum dependence of the effective charges is significantPrimary Subject

Source

1983; 42 p; 32 refs.

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Report

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DIFFERENTIAL CROSS SECTIONS, DWBA, ELECTRON REACTIONS, ENERGY-LEVEL TRANSITIONS, EXCITED STATES, FORM FACTORS, INELASTIC SCATTERING, MAGNESIUM 24, MAGNESIUM 24 TARGET, MEV RANGE 100-1000, MEV RANGE 10-100, MOMENTUM TRANSFER, NEON 20, NEON 20 TARGET, NUCLEAR MODELS, NUCLEAR STRUCTURE, PROTON REACTIONS, PROTONS, S MATRIX, SILICON 28, SILICON 28 TARGET, TRANSITION AMPLITUDES

AMPLITUDES, BARYON REACTIONS, BARYONS, BORN APPROXIMATION, CATIONS, CHARGED PARTICLES, CROSS SECTIONS, ELEMENTARY PARTICLES, ENERGY LEVELS, ENERGY RANGE, EVEN-EVEN NUCLEI, FERMIONS, HADRON REACTIONS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, IONS, ISOTOPES, LEPTON REACTIONS, LIGHT NUCLEI, MAGNESIUM ISOTOPES, MATHEMATICAL MODELS, MATRICES, MEV RANGE, NEON ISOTOPES, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUCLEONS, PARTICLE PROPERTIES, SCATTERING, SILICON ISOTOPES, STABLE ISOTOPES, TARGETS

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Amos, K.; Bennett, M.T.

Melbourne Univ., Parkville, VIC (Australia). School of Physics

Melbourne Univ., Parkville, VIC (Australia). School of Physics

AbstractAbstract

[en] Understanding the nature and specifics of the potential energy of interaction between two colliding quantum systems, be they of nuclear, of atomic or of molecular type, is central in almost all studies of their possible reactions. Conventionally, elastic scattering data is used as a measure to assess the propriety for such (non-relativistic) interaction. There are two basic approaches by which quantitative information on the (effective, local) interaction between colliding quantal systems may be sought from measured, elastic scattering data. The first is the direct approach in which either a form for the interaction is assumed or its radial variation is determined by folding underlying component interactions with the density profiles of the colliding systems. The result is then used in the Schroedinger equations to specify the relative motion wave functions for the system. From those solutions, phase shifts are extracted and thence, by standard summations of Legendre polynomials. observables such as the differential cross sections are predicted. Frequently the procedure is modified to a numerical inverse method by adjusting values of parameters in the chosen form seeking a result that 'best fits' measured data. Alternatively one can use global inverse scattering theories with one of many methods of solution to determine candidate interactions from S functions (phase shifts) that have been determined by a (quality) fit measured data. The key problem in assessing a quantal scattering interaction is the definition of the physical S function. Analyses of scattering data from isobaric systems are presented. They include cross sections for the systems

^{3}He from^{14}C at 72 MeV and^{14}C from^{3}H at matching energy of 334.4 MeV. 5 refs., 5 figsPrimary Subject

Secondary Subject

Source

1997; 16 p

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Report

Literature Type

Numerical Data

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AMPLITUDES, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CARBON ISOTOPES, CHEMICAL ANALYSIS, CROSS SECTIONS, DATA, EVEN-EVEN NUCLEI, INFORMATION, ISOTOPES, LIGHT NUCLEI, MATHEMATICAL MODELS, NONDESTRUCTIVE ANALYSIS, NUCLEAR REACTIONS, NUCLEI, NUMERICAL DATA, POTENTIALS, RADIOISOTOPES, SCATTERING, TARGETS, YEARS LIVING RADIOISOTOPES

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AbstractAbstract

[en] This report documents the essential details of the NN and NA computer programs that culminate in the prediction of elastic and inelastic nucleon scattering observables form optical potentials generated by full folding and effective NN interaction within the nuclear medium. That same (energy and density dependent) effective interaction is used as the transition operator in the distorted wave approximation (DWA) for inelastic (and charge exchange) nucleon scattering from nuclei. The report consists of four sections: 1) general remarks and program locations, 2) the t- and g-matrix codes and how to use them, 3) the effective interaction codes and how to use them, and 4) the NA codes, DWBA97 and DWBB97 and how to use them. (author)

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Secondary Subject

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28 Sep 1998; 52 p; Contains a bibliography for details on computer codes' theory and methods of evaluation

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Report

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Software

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AbstractAbstract

[en] The Melbourne-Padova collaboration seeks to understand how select few and many nucleon systems and reactions are defined from the basic realistic underlying two nucleon interaction properties. The first requirement then is to specify just what are those realistic interaction attributes. The primary quantities are the two nucleon (NN) t matrices fully off of the energy shell, i.e. solutions of the Lippmann-Schwinger (LS) equations starting with a (realistic) form of the elementary NN potentials such as derived from more elemental studies. Thus part of the collaboration has been to establish methods of specification of separable interactions for the NN system that are accurate fully of off the energy shell, are free of any pathology and ,for utility, are of low rank. Use of such forms for the NN interaction in few body studies are also part of the collaboration. Notable interest are with the binding energy calculations of three and four nucleon systems as well as with reactions initiated by the absorption of a pion given the particular set of reaction mechanisms involved. Pion and nucleon induced reactions (elastic, inelastic and charge exchange) from nuclei (many nucleon systems) are another attribute of the collaboration. In Melbourne, a fully microscopic theory (based upon the distorted wave approximation (DWA)) has been developed and the codes constructed to make a large basis shell model calculations of the nuclear structure, extract therefrom the one body density matrix elements (OBDME) defining transitions, find (local coordinate space) effective NN g matrices that accurately map realistic ones and fold same to specify fully nonlocal NA optical potentials. First applications made to analyse proton-

^{l2}C scattering data have been very successful. The results obtained to date by the Melbourne-Padova collaboration are summarized in this paper. 23 refs., 19 figsPrimary Subject

Source

1996; 31 p

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Report

Literature Type

Numerical Data

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BARYON REACTIONS, BARYON-BARYON INTERACTIONS, COOPERATION, DATA, DOCUMENT TYPES, ENERGY, HADRON REACTIONS, HADRON-HADRON INTERACTIONS, INFORMATION, INTERACTIONS, MATHEMATICAL MODELS, MESON REACTIONS, NUCLEAR MODELS, NUCLEAR REACTIONS, NUMERICAL DATA, PARTICLE INTERACTIONS, POTENTIALS, RESEARCH PROGRAMS, SCATTERING

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