Angular distributions of Sc fragments from the interaction of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">U</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>238</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>with 0.8-400 GeV protons

Fortney, D. R.; Porile, N.T.

doi:10.1103/physrevc.21.2511

Cited by 35 publications

(12 citation statements)

References 26 publications

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“…Experimental indications for the existence of time resonances are in the steeper energy decrease in the spectra for larger emission angles θ and of the more distinct oscillations in spectra for the intermediate emission angles θ in the laboratory system (between the minimal and maximal experimental values), which are observed in [1][2][3][4][5][6]. Nevertheless, for small angles, the last oscillation peak in spectra (for the largest energies E) can be connected with the pure kinematical effect of direct or peripherical processes in the laboratory system.…”

Section: Discussionmentioning

confidence: 96%

“…For lighter projectiles (from p to 20 Ne) with energies above 1 -10 Gev/nucl, studies have observed structureless, exponentially decaying inclusive and non-inclusive energy spectra, often accompanied by slight oscillations over the range of projectiles and projectile energies, targets, and registered final fragments (see, for example, [1][2][3][4][5][6][7][8]). For heavier projectiles these phenomena were observed even for smaller energies (see, for instance, [9]).…”

Section: Introductionmentioning

confidence: 99%

“…For heavier projectiles these phenomena were observed even for smaller energies (see, for instance, [9]). The fireball models [1,5] had been, to a certain degree, successful in the analysis of heavy-ion reactions with energies up to 1 GeV/nucl. Also, the intranuclear cascade model [10] and the nuclear fluid model [11] had worked rather well at higher energies.…”

Section: Introductionmentioning

confidence: 99%

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The possibility of time resonance (explosion) phenomena in high-energy nuclear reactions

2006

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This study shows that the exponential decrease of the energy spectra, accompanied by slight oscillations, with final-fragment energy in high-energy nuclear reaction, and independent of fragments, targets, projectiles, and projectile energies, can be explained under some conditions in the range of strongly overlapping compound resonances by a new phenomenon of time resonances (explosions). These time resonances (explosions) correspond to the formation of a few highlyexcited, non-exponentially decaying nuclear clots (partial compound nuclei consisting of certain small groups of target and projectile nucleons). The proposed approach is an alternative way of analyzing experimental data compared with the majority of known descriptions (for instance, fireball models). This is a new and more general version of the time-evolution approach compared with the Izumo-Araseki time compound-nucleus model.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The possibility of time resonance (explosion) phenomena in high-energy nuclear reactions

2006

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“…In the wide energy region of the bombarding particles more 1-10 GeV/nucleon (see, for instance, [29][30][31][32][33][34][35]) and for the great their number (from p till 20 Ne), number of targets and of the registered final fragments there are observed the exponentially decreasing inclusive (and some times non inclusive) energy spectra without structure. For more heavy bombarding particles such phenomena are observed also smaller energies (see, for instance, [36]).…”

Section: The Manifestation Of the Time Resonances (Explosions) Of Commentioning

confidence: 99%

On Mathematical Foundations of Quantum Collisions and Nuclear Reactions and Outcome of Certain Physical Phenomena from Them

Olkhovsky¹

2014

IJP

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I. Analytical structure of the non-relativistic unitary and non-unitary S-matrix is reviewed for the cases of any interactions with any motion equations inside a sphere of radius a, enclosed by centrifugal and rapidly decreasing (exponentially or by the Yukawian law or by the more rapidly decreasing) potentials. Some kinds of the symmetry conditions are imposed. The Schroedinger equation for the particle motion in the external region where r > a and the completeness of the correspondent wave functions are assumed. The connection of the obtained results with the causality is examined. Partially some analytical properties for the multi-channel S-matrix are reviewed and the sum rules for mean compound-nucleus time delays and the density of compound-nucleus levels. Sometimes (as physical manifestations of the profound general methodic and in very good consistent accordance with the experiment) observable physical effects, such as parity violation enhancement and time resonances or explosions, are appeared. Finally a scientific program of future search is presented as a clear continuation and extension of the obtained results. II. It is already known the appearance of time advance (due to distortion by the non-resonant background) instead of the expected time delay in the region of a compound-nucleus resonance in the center-of-mass (C-) system. Here at the same conditions we study cross sections and durations of the neutron-nucleus scattering in the laboratory (L-) system. Here it is shown that such time advance is a virtual paradox but in the L-system the timeadvance phenomenon does not occur and only the trivial time delay is observed. At the same time the transformations from C-system into the L-system appeared to be different from the standard kinematical transformations because in the C-system the motion of a compound nucleus is absent but it is present in the Lsystem. We analyze the initial wave-packet motion (after the collision origin) and the cross section in the laboratory (L-) system. Also here (as physical revelations of profound general methodic and in very good consistent accordance with the experiment) several results of the calculated cross sections for the neutron-nucleus in comparison with the experimental data in the L-system at the range of one or two overlapped compound resonances are presented. It is shown in the space-time approach that the standard kinematical transformations of cross sections from the C-system to the L-system are not valid because it is necessary to consider the center-of-mass motion in the L-system. Finally on a correct self-consistent base of the space-time description of the nuclear processes in the laboratory system with 3 particles in the final channel, it is shown the validity of the former approach, obtained for the space-time description of the nuclear processes with 2-particle channels earlier. Keywords: (I) S-matrix, condition of completeness of external wave functions, external centrifugal and rapidly decreasing potentials, causality, time resonances or ex...

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“…For the interaction of energetic protons wi~h heavy targets to produce light fragments (A < 50), the bulk of the data suggests that the two-step model breaks down and there is no temporal separation of the production mechanism for these fragments into fast and slow steps. (In the interaction of 0.8-400 GeV protons with U to produce Sc fragments, Fortney and Porile 19 were able to find parameters within the two step model that fit their angular distributions, but they suggested that the values of these parameters were difficult to reconcile with other data on the production of these fragments. ) Ug/cm2 in the first experiment and thicknesses of 79.6 and 101.4 ug/cm 2 in the second experiment.…”

Section: Introductionmentioning

confidence: 99%

Target-fragment angular distributions for the interaction of 86 MeV/A 12C with 197Au

et al. 1985

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Angular distributions of Sc fragments from the interaction ofU238with 0.8-400 GeV protons

Cited by 35 publications

References 26 publications

The possibility of time resonance (explosion) phenomena in high-energy nuclear reactions

The possibility of time resonance (explosion) phenomena in high-energy nuclear reactions

On Mathematical Foundations of Quantum Collisions and Nuclear Reactions and Outcome of Certain Physical Phenomena from Them

Target-fragment angular distributions for the interaction of 86 MeV/A 12C with 197Au

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