Interaction of relativistic deuterons with nucleons

Dolidze, M. G.; Lykasov, G. I.

doi:10.1007/bf01289352

Cited by 6 publications

(18 citation statements)

References 16 publications

(20 reference statements)

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“…3, 4, 5 present the behaviour of the function R for three types of structure functions substituted into the double-inclusive cross section standing in the R's nominator while the donominator remains to be the same for all cases. Comparison of the correlation functions R calculated using different structure functions of the deuteron for the reaction dp-~ppm at an incoming deuteron momentum of 9 GeV/c and proton-detecting angles 0~ = 0.01 ~ and 02= 19 ~ The dashed, solid and dashed-dot curves represent the R functions for the structure functions of (l 1), (12) and (13) Fig. 3, but for 0z = 7 ~ and 02 = 7 ~ the other protons is defined by the two-particle kinematics in the subprocesses flA--+DE and bA--+ CD in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In order to use this reaction for extracting the nucleon momentum distribution in the deuteron one needs correct calculations of secondary interactions (SI) like rescattering, final state interaction [9] etc. Unfortunately, due to an ambiguity of the SI calculations [9][10][11][12] one can use three main variants of the deuteron structure functions ( Fig. 1): i) the phenomenological structure function by Blankenbecler and Schmidt [8]; ii) the structure function obtained from the deuteron nonrelativistic wave function (e.g.…”

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confidence: 99%

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Correlations of two protons in relativisticdp-collisions

Efremov

Kanafin

Kim

1991

Z. Physik A - Hadrons and Nuclei

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Two-proton correlations in the dp--+ppn collisions of relativistic deuterons with protons are considered. These correlations give more information than inclusive proton spectra described in the framework of different deuteron structure function models because of uncertainty in the calculation of secondary interaction contribution (rescattering processes and final state interactions). We present the predictable calculations which show different behaviour of the correlation function for different deuteron structure function models in the kinematic region where contributions of secondary interactions are negligible. PACS: 12.35.Ht; 25.45.De; 17.35.Cs experimental data [6]. An important element of this model is the nucleon momentum distribution G(x,k• inside the deuteron, which defines the probability of finding in relativistic deuteron the nucleon with transverse momentum ka and the fraction x of the deuteron longitudinal momentum. In order to use this reaction for extracting the nucleon momentum distribution in the deuteron one needs correct calculations of secondary interactions (SI) like rescattering, final state interaction [9] etc. Unfortunately, due to an ambiguity of the SI calculations [9][10][11][12] one can use three main variants of the deuteron structure functions ( Fig. 1): i) the phenomenological structure function by Blankenbecler and Schmidt [8]; ii) the structure function obtained from the deuteron nonrelativistic wave function (e.g. for the Paris potential [13]); iii) the

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Correlations of two protons in relativisticdp-collisions

Efremov

Kanafin

Kim

1991

Z. Physik A - Hadrons and Nuclei

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“…1 (a-e) type do not vanish in OPTh. As shown in [13][14][15], the graphs of Fig. lb [13] and 1 c [14] give great contributions to the proton spectrum and the graphs of Fig.…”

Section: The Amplitude Of the Process Dn-+ Pxmentioning

confidence: 99%

“…ld [14] and le [15] give a small contribution in some kinematic region. The four-momenta of the fast deuteron Pd and of its nucleons kl, k2 are represented in the IMF as [15] :…”

Section: The Amplitude Of the Process Dn-+ Pxmentioning

confidence: 99%

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Sensitivity of T20 indA ?PX to the reaction mechanism and relativistic effects

Dolidze

Lykasov

1990

Z. Physik A - Atomic Nuclei

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A method for the analysis of interactions between fast deuterons and nucleons is developed, taking into account both the relativistic effects in the deuteron and the mechanism of their interaction. The inclusive proton spectra and the polarisation characteristics are investigated, taking for instance the fragmentation type processes of deuterons on nucleons. A strong sensitivity of the deuteron polarisation tensor component T2o both to the reaction mechanism and to the relativistic structure of the deuteron is shown. It is shown that there can't be a direct indication of the 6q-state existence in the deuteron from the T2o experimental data. PACS: 25.45.Dc

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Antiproton production inp+A andd+A reactions at subthreshold energies

Cassing

Lykasov

Teis

1994

Z. Physik A - Hadrons and Nuclei

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The production of antiprotons in proton-nucleus and deuteron-nucleus collisions is analyzed with respect to onestep nucleon-nucleon (NN ---+ NNp/5) and secondary Anucleon (AN ~ NNN/5) production channels within a phase-space model incorporating the selfenergies of the baryons. It is found that contrary to nucleus-nucleus collisions the A induced reaction channels are of minor importance except at very low bombarding energies. The data from KEK are approximately reproduced when accounting for the internal momentum distribution of the deuteron which provides a natural explanation for the large enhancement of the/5 cross section in d+A as compared to p+A. 25.40.-h Antiproton production at energies of a few GeV/u is the most extreme subthreshold production process and has been observed in proton-nucleus collisions some time ago [1][2][3]. In the last years the problem was taken up again at KEK [4] and GSI [5] with new detector setups. Various descriptions for these data have been proposed (cf. PACS:[6] and refs. therein), most of them based on the assumption of kinetic and chemical equilibrium.First fully relativistic transport calculations for antiproton production including/~ annihilation as well as the change of the quasi-particle properties in the medium have been reported in [7]. There it was found that according to the reduced nucleon mass in the medium the threshold for /5-production is shifted to lower energy and the antiproton cross section prior to annihilation becomes dramatically enhanced as compared to a relativistic cascade calculation where no in-medium effects are incorporated. In fact, Teis et al. [6] have shown recently (within the relativistic BUU approach) that the t5 yields for p + A and A + A can be well reproduced simultaneously when employing proper selfenergies for the baryons in the dense medium.It is the aim of the present note to investigate the question, whether the KEK data on/5 production [4] -which show a dramatic enhancement for the deuteron projectile at the same bombarding energy per nucleon -can be understood within the same scheme as well. Since the RBUU transport approach is not well suited for modelling the proSupported by BMFT, GSI Darmstadt and Forschungszentrum J/ilich perties of a weakly bound deuteron, we use a phase-space approach [8,9] which allows for a proper incorporation of the deuteron momentum distribution.The phase-space model adopted is described in more detail in [9,10]. Its ingredients are as follows: apart from the elementary differential cross section E,jda@/dak~ the inclusive t5 cross section for p+ A reactions is determined by the momentum distribution p(p) describing the available momentum components in a nucleus as well as by pd(k) in case of d + A reactions. We use a Ganssian fit to the experimental momentum distribution for 12C from [11] and use pd(k) for the deuteron from the Paris NN-potential [12]. Whereas the latter two distributions are known sufficiently well, the t5 production cross section in the medium is still a matter of debate. Here we ado...

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Interaction of relativistic deuterons with nucleons

Cited by 6 publications

References 16 publications

Correlations of two protons in relativisticdp-collisions

Correlations of two protons in relativisticdp-collisions

Sensitivity of T20 indA ?PX to the reaction mechanism and relativistic effects

Antiproton production inp+A andd+A reactions at subthreshold energies

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