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Moretto, L.G.

California Univ., Berkeley (USA). Lawrence Berkeley Lab

California Univ., Berkeley (USA). Lawrence Berkeley Lab

AbstractAbstract

No abstract available

Original Title

Reviews

Primary Subject

Source

Jul 1973; 62 p; 3. symposium on physics and chemistry of fission; Rochester, New York, USA; 13 Aug 1973; CONF-730823--16; SM--174/204

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Report

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Conference

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COLLECTIVE MODEL, ENERGY LEVELS, EXCITATION, FISSION, GROUND STATES, HAMILTONIANS, HEAVY NUCLEI, INTERMEDIATE MASS NUCLEI, LIQUID DROP MODEL, MASS, NILSSON-MOTTELSON MODEL, NUCLEAR REACTIONS, PAIRING INTERACTIONS, PHASE SPACE, PROBABILITY, REVIEWS, SADDLE-POINT METHOD, SHELL MODELS, STATISTICS, TRANS 104 ELEMENTS, VOLUME

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AbstractAbstract

No abstract available

Original Title

Evaporation of

^{9}Be,^{20}NePrimary Subject

Source

Hendrie, D.L.; Tsang, C.F.; Zalkin, A. (eds.); California Univ., Berkeley (USA). Lawrence Berkeley Lab; p. 28-31; May 1973

Record Type

Report

Literature Type

Progress Report

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Moretto, L.G.

Lawrence Berkeley Lab., CA (USA)

Lawrence Berkeley Lab., CA (USA)

AbstractAbstract

[en] The physics of deep inelastic heavy ion collisions is briefly reviewed in the light of the experimental capabilities offered by large Tandem Accelerators. Three aspects are selected for illustration. The first is the problem posed by the angular distributions. The role of quantal fluctuations (diffraction) and of dynamical fluctuations is discussed. The possibility of extracting angular momentum fluctuations from the angular distribution width is pointed out, as well as the way to compare such results with those obtained from gamma-ray multiplicities or angular distributions. The likely sources of angular momentum fluctuations are discussed. The second problem is that of energy dissipation and partition. The experimental evidence from thermal equilibrium is reviewed and experiments to test thermal equilibrium through the measurement of the variance in the energy distribution are suggested. The correlation between energy loss and the mass variance is reviewed in terms of the mass transfer mechanism. Possible ways to determine the mass of the transferred particle are illustrated. The third problem considered is the experimental lack of mass drift in the mass distributions vs Q-value when it is expected on the basis of potential energy considerations. This problem is associated with the fast fragment thermalization and explained in terms of a feed-back effect associated with the temperature gradient that develops between two colliding nuclei of different mass

Primary Subject

Source

Mar 1983; 19 p; International symposium on nuclear physics at large tandem accelerators; Padua (Italy); 15-17 Mar 1983; CONF-830384--1; Available from NTIS, PC A02/MF A01; 1 as DE83015732

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Report

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Conference

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Moretto, L.G.

Lawrence Berkeley Lab., CA (USA)

Lawrence Berkeley Lab., CA (USA)

AbstractAbstract

[en] The relevance of the statistical equilibrium limit to the description of substantially relaxed degrees of freedom is discussed. Fluctuations are considered specifically in the following processes: the correlation between entrance-channel angular momentum and exit-channel kinetic energy; the sharing of the dissipated kinetic energy between the two fragments; the magnitude and the alignment of the fragment angular momentum including the effect of shell structure. It is found that statistical fluctuations play a major role and that the statistical equilibrium limit seems to have been reached for a number of degrees of freedom

Primary Subject

Source

Feb 1982; 29 p; International symposium on nuclear fusion and related collective phenomena; Bad Honnef (Germany, F.R.); 26 - 29 Oct 1981; CONF-8110165--3; Available from NTIS., PC A03/MF A01 as DE82012911

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Report

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Conference

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Moretto, L.G.

California Univ., Berkeley (USA). Lawrence Berkeley Lab

California Univ., Berkeley (USA). Lawrence Berkeley Lab

AbstractAbstract

[en] In the present formalism the diffusion along the mass asymmetry coordinate has been generalized by refining the treatment of the radial and angular motion necessary for an adequate reproduction of the kinetic energy and angular distributions. The radial potential is used to evaluate the radial force. The interaction time and the average penetration for each l-wave are estimated. The diffusion calculation is then carried out for the duration of the interaction time. The angular rotation during diffusion is calculated for each fragment on the basis of the tangential energy. The resulting average deflection function shows the deep inelastic rainbow observed experimentally. The rainbow angle moves from positive to negative angles with increasing bombarding energy. Good agreement is obtained for the average final kinetic energy as a function of angle. The calculated Z distributions become broader as the excitation energy increases. The angular distributions for individual fragments show the characteristic disappearance of the side peaking and the development of forward peaking as the distance in Z from the projectile increases. The calculated Z angular and γ-ray multiplicity distributions are successfully compared with the experimental data

Primary Subject

Source

Aug 1977; 16 p; International conference on nuclear structure; Tokyo, Japan; 5 - 10 Sep 1977; CONF-770968--1; Available from NTIS., PC A02/MF A01

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Report

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Conference

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Moretto, L.G.

Lawrence Berkeley National Lab., CA (United States). Funding organisation: USDOE Director, Office of Science. Office of High Energy and Nuclear Physics. Division of Nuclear Physics (United States)

Lawrence Berkeley National Lab., CA (United States). Funding organisation: USDOE Director, Office of Science. Office of High Energy and Nuclear Physics. Division of Nuclear Physics (United States)

AbstractAbstract

No abstract available

Primary Subject

Source

Physical Review Letters; v. 85(12); 1 Jul 1999; [vp.]; ISSN 0031-9007; ; CODEN PRLTAO; AC03-76SF00098; Available from Lawrence Berkeley National Lab., CA (United States)

Record Type

Miscellaneous

Literature Type

Numerical Data

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Moretto, L.G.

California Univ., Berkeley (USA). Lawrence Berkeley Lab

California Univ., Berkeley (USA). Lawrence Berkeley Lab

AbstractAbstract

[en] The isobaric charge distributions are discussed in terms of quantal and classical isospin fluctuations. The roles of mass asymmetry and of the higher giant isovector modes are treated within the framework of a cylinder model that is worked out exactly. Spin fluctuations are considered first in terms of quantal fluctuations in a cylinder model and second in terms of thermal fluctuations in a two-sphere model. The results are applied to the calculation of in- and out-of-plane angular distributions for sequential fission, alpha and gamma decay. Analytical expressions are obtained for the angular distributions. The theoretical predictions are compared with experimental results for sequential fission, alpha, and gamma angular distributions. 23 figures

Primary Subject

Source

Jan 1980; 58 p; 18. international winter meeting on nuclear physics; Bormio, Italy; 21 - 26 Jan 1980; CONF-800139--1; Available from NTIS., PC A04/MF A01

Record Type

Report

Literature Type

Conference; Numerical Data

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Moretto, L.G.

Lawrence Berkeley Lab., CA (USA)

Lawrence Berkeley Lab., CA (USA)

AbstractAbstract

[en] The compound nucleus mechanism for complex fragment emission is discussed theoretically and demonstrated experimentally. The role of the potential energy as a function of mass asymmetry is shown in experimental charge distributions. This process is followed from near the threshold up to bombarding energies of several tens of MeV A. 12 refs., 12 figs

Primary Subject

Secondary Subject

Source

Apr 1986; 22 p; International conference on heavy ion physics; Rochester, NY (USA); 21-22 Apr 1986; CONF-8604165--7; Available from NTIS, PC A02/MF A01; 1 as DE86012501; Portions of this document are illegible in microfiche products.

Record Type

Report

Literature Type

Conference; Numerical Data

Report Number

Country of publication

ALUMINIUM 27 REACTIONS, BERYLLIUM 9 REACTIONS, CARBON 12 REACTIONS, COINCIDENCE METHODS, COMPOUND NUCLEI, DIFFERENTIAL CROSS SECTIONS, EXPERIMENTAL DATA, FINITE-RANGE INTERACTIONS, FISSION BARRIER, FISSION YIELD, GERMANIUM 74 TARGET, HELIUM 3 REACTIONS, KINETIC ENERGY, LANTHANUM 139 TARGET, LIQUID DROP MODEL, MECHANICAL FRAGMENTATION, MOMENTUM TRANSFER, NIOBIUM 93 TARGET, SCATTERPLOTS, SILVER, TOTAL CROSS SECTIONS, VELOCITY

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Moretto, L.G.

California Univ., Berkeley (USA). Lawrence Berkeley Lab

California Univ., Berkeley (USA). Lawrence Berkeley Lab

AbstractAbstract

[en] The collective modes excited in deep-inelastic reactions and their natural hierarchy provided by their characteristic relaxation times is described. The relaxation of the mass asymmetry mode is discussed in terms of a diffusion process. Charge distributions and angular distributions as a function of Z calculated with this model are in good agreement with experimental data. This diffusion model also treats the transfer of energy and angular momentum in terms of particle transfer, and is successfully compared with experimental γ-ray multiplicities as a function of both Q-value and mass asymmetry. The angular momentum transfer is again considered in connection with the sequential fission of heavy, deep-inelastic fragments and the excitation of collective modes in the exit channel is considered. The role of the giant E1 mode in the equilibration of the neutron-to-proton ratio is discussed. 39 references

Original Title

Mass asymmetry, diffusion, charge and angular distributions, energy and momentum transfer

Primary Subject

Secondary Subject

Source

Mar 1979; 62 p; Available from NTIS., PC A04/MF A01

Record Type

Report

Literature Type

Numerical Data

Report Number

Country of publication

ANGULAR DISTRIBUTION, ASYMMETRY, COLLECTIVE MODEL, DEEP INELASTIC SCATTERING, DIFFUSION, ELECTRIC CHARGES, ELECTRIC DIPOLE MOMENTS, ENERGY TRANSFER, EXCITATION, FISSION FRAGMENTS, GIANT RESONANCE, GRAPHS, MASS, NEUTRONS, PROTONS, QUASI-FISSION, Q-VALUE, RELAXATION, SPATIAL DISTRIBUTION, THEORETICAL DATA

BARYONS, CATIONS, CHARGED PARTICLES, DATA, DATA FORMS, DIPOLE MOMENTS, DISTRIBUTION, ELECTRIC MOMENTS, ELEMENTARY PARTICLES, ENERGY, ENERGY-LEVEL TRANSITIONS, FERMIONS, HADRONS, HEAVY ION REACTIONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, INELASTIC SCATTERING, INFORMATION, INTERACTIONS, IONS, LEPTON-BARYON INTERACTIONS, LEPTON-HADRON INTERACTIONS, LEPTON-NUCLEON INTERACTIONS, MATHEMATICAL MODELS, NUCLEAR FRAGMENTS, NUCLEAR MODELS, NUCLEAR REACTIONS, NUCLEONS, NUMERICAL DATA, PARTICLE INTERACTIONS, RESONANCE, SCATTERING

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Moretto, L.G.

Lawrence Berkeley Lab., CA (USA)

Lawrence Berkeley Lab., CA (USA)

AbstractAbstract

[en] The multifaceted aspects of deep-inelastic heavy-ion collisions are discussed in terms of the statistical equilibrium limit. It is shown that a conditional statistical equilibrium, where a number of degrees of freedom are thermalized while others are still relaxing, prevails in most of these reactions. The individual degrees of freedom that have been explored experimentally are considered in their statistical equilibrium limit, and the extent to which they appear to be thermalized is discussed. The interaction between degrees of freedom on their way towards equilibrium is shown to create complex feedback phenomena that may lead to self-regulation. A possible example of self-regulation is shown for the process of energy partition between fragments promoted by particle exchange. 35 references

Primary Subject

Source

Aug 1983; 29 p; International conference on nuclear physics; Florence (Italy); 29 Aug - 3 Sep 1983; CONF-830833--2; Available from NTIS, PC A03/MF A01 as DE84000722

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Report

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Conference

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