Two-pronged events in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>collisions at 8.56 GeV/<i>c</i><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML

Glagolev, V.; Lebedev, R.M.; Saitov, I.S.; Streltsov, V. N.; Zuravleva, L. I.; Горбунов, А. А.; Khayretdinov, K. U.; Martinská, G.; Patočka, I.; Seman, M.; Braun, H.; Fridman, A.; Gerber, J.; Johnstad, H.; Juillot, P.; Michalon, A.; Aladashvili, B.S.; Nioradze, M.; Siemiarczuk, T.; Sobczak, T.; Steṕaniak, J.; Zielinski, P.

doi:10.1103/physrevc.18.1382

Cited by 17 publications

(9 citation statements)

References 14 publications

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“…where N is a normalization constant, ~c= 21/~, e~ Assuming that the spectator mechanism dominates for kinetic energy below 10 MeV, the differential 3He cross section in this region can be described by (5). The best agreement with experimental data is obtained for fi = 1.2 fm -~ and N}r~r ) =0.326 +_0.006.…”

Section: Experimental Results and Their Discussionsupporting

confidence: 70%

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4He fragmentation induced by 46–400 GeV Protons

et al. 1985

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Inclusive p, d and 3He cross sections have been obtained using experimental data on p4He collisions over an incident proton energy range of 46-400 GeV. Considering the slopes of spectra, the effective nuclear temperature has been found to be T o = 11 MeV, which is in good agreement with experimental results for lower energies and heavier targets. The shape of the 3He inclusive spectrum suggests the existence of two different 3He production mechanisms. The experimental 3He cross section is compared with theoretical predictions assuming fragment formation as a result of the spectator and cluster knockout mechanisms. The 4He ~ 3He + n vertex constant has been found to be G2 = 10.9+0.2 fro.

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Section: Experimental Results and Their Discussionsupporting

confidence: 70%

“…2b). Separately these mechanisms have been considered in papers [5,6] as applied to the p+4He--*SHe+n+p re- (4) where Q is the 3He momentum, E the 3He kinetic energy and M 3 the 3He mass. All quantities are considered in the lab.…”

Section: Experimental Results and Their Discussionmentioning

confidence: 99%

4He fragmentation induced by 46–400 GeV Protons

et al. 1985

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“…* Calcu-* In [5] there was measured the momentum spectrum of 3He in the reaction a +p ~ 3He +p +n. In Born approximation (spectator model) this spectrum is the same as the momentum distribution of nucleons inside of a-particle (in its c.m.s) The histogram represents the calculated results, the points are the experimental ones from [5] lated this way the momentum distribution of e-particle nucleons is shown in Fig.…”

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confidence: 99%

“…where Po=140 MeV/c the parameter determined from the best fit to the experimental data [5]. * Calcu-* In [5] there was measured the momentum spectrum of 3He in the reaction a +p ~ 3He +p +n.…”

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confidence: 99%

“…Initial e-particle can collide elastically or inelastically with one of intranuclear nucleons inside of a cylinder with an axis in the direction of e-particle motion and with radius reff =r0 +/'1 -k;~ here ro = 1.3.10-13 cm -effective radius of the strong interaction, r 1 -parameter registering the radius of e-particle, Z-its de Brogle wave length. In order to determine elastic and inelastic e-N interaction cross sections o-~j and r we use the approximation curves of [20]; the probabilities of fragmentation channels e+N~e+ .... 3He+..., t+ .... d+..., p +... are determined by using experimental data of [5,21,22] (see Fig. 1).…”

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confidence: 99%

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Cascade model of inelastic interactions of ?-particles with nuclei

Barashencov

Musulmanbecov

Gereghi³

1980

Z Physik A

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High energy e-particle interactions with nuclei are considered as interference of cascades initiated by mesons, nucleons and fragments of e-particle, which are produced in collisions of e-particle with nucleons of the target nucleus. Nuclear depletion has been taken into account during the interaction process. Emulsion and streamer chamber data of e-particle interactions with light (Li, C, N, O, A1) and heavy (Cu, Ag, Br, Pb) nuclei at the energy 3.64 GeV per nucleon have been analyzed. At the range of atomic numbers A > 100 the discrepancy between theoretical calculations and experimental data becomes noticeable.Excluding the case of deuteron-nucleus reactions one can consider e-nucleus interactions as the simplest chance to test various models of nucleus-nucleus interactions. Rather plentiful experimental data of eparticle interactions at the energies of about few GeV per nucleon and a wide range of target nuclei promote this [1][2][3][4][5][6][7][8][9][10]. The interest to e-nucleus interactions is stimulated by the problems of radiation protection from cosmic rays and of influence of this radiation on biological objects.* In Refs. [11][12][13] it has been shown that the amplitude of elastic e-nucleus collision can be considered as a superposition of amplitudes for e-particle interacting as a whole with separate nucleons inside of the target nucleus. This approach simplifies the calculations and is in good agreement with experiments. For the case of inelastic e-Nucleus interactions this approach has been considered in [14] in which there has been obtained better agreement with experiments than in cases of using more crude models [t5, 16] where the initital helium ion has been considered as a set of four uncorrelated nucleons and the changing of nuclear density during the cascade process has not been taken into account (the last effect is especially important). However the consideration in [14] was limited by the energies T~50--200 MeV per nuc-* We are obliged to Dr. A.I. Vikhrov, Dr. Ju.G. Grigorov, Dr. V.D. Dudkin for discussing of this question leon, for which cosmic and accelerator data were known.* Calculations in the framework of the approximation used in [14] for higher energies are merely tentative and they give a considerable quantative discrepancy with the experiments. The causes for this are the following: because of poor information about e-nucleon interactions some channels of e-N reaction accompanied by pion production were not taken into account; channels of e-particle fragmentation in deuterons were neglected; the exitation energy of residual nucleus was negative sometimes because of insufficiently precise cinematical approximations in the channels of t and 3He-fragments production. Our purpose is to expand the model of [14] to the energy region T~ ~few GeV per nucleon and to analize the validity of the intranuclear cascade mechanism for e-nucleus interactions in this energy domain.** The target nucleus is considered as a Fermi-gas of nucleons with density p (r) which is described for light nu...

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