Subthreshold K+-production in proton-nucleus reactions

Cassing, W.; Batko, G.; Mosel, U.; Niita, Koji; Schult, O.W.B.; Wolf, Gy.

doi:10.1016/0370-2693(90)92094-y

Cited by 80 publications

(98 citation statements)

References 20 publications

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“…For description of these processes mean-field transport models, such as time-dependent Hartree-Fock (TDHF) [1,2] and the Boltzmann-Uhling-Uhlenbeck (BUU) [3] models are not very useful. TDHF includes, the so called, one-body dissipation mechanism, but associated fluctuation mechanism is not incorporated into the model.…”

Section: Introductionmentioning

confidence: 99%

Quantal effects on spinodal instabilities in charge asymmetric nuclear matter

Ayık¹,

Er²,

Yılmaz³

et al. 2008

Nuclear Physics A

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Quantal effects on growth of spinodal instabilities in charge asymmetric nuclear matter are investigated in the framework of a stochastic mean field approach. Due to quantal effects, in both symmetric and asymmetric matter, dominant unstable modes shift towards longer wavelengths and modes with wave numbers larger than the Fermi momentum are strongly suppressed. As a result of quantum statistical effects, in particular at lower temperatures, magnitude of density fluctuations grows larger than those calculated in semi-classical approximation.

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Section: Introductionmentioning

confidence: 99%

Quantal effects on spinodal instabilities in charge asymmetric nuclear matter

Ayık¹,

Er²,

Yılmaz³

et al. 2008

Nuclear Physics A

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“…Using local equilibrium distributions for each fluid, multi-fluid models the local momentum distribution is parametrized by a set of models have been developed for describing nuclear collisions [2, 3,14, 15]. In these As an alternative to the simulations by kinetic equations, mean-field multi-iiuid been recently applied to heavy-ion collisions at intermediate energies [11,12,13].Uehling-Uhlenbeck (BUU) type [1, 2, 3, 4,5,6, 7,8,9, 10]. Such equations have self-consistent mesonic mean fields and a binary collision term of the Boltzmann space distribution function which is determined by a transport equation containing In the semi-classical limit the Wigner function reduces to a single-particle phase…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…3) and a stochastic small statistical errors within the BLE approach. Therefore, we have reduced equations [11,12,13], it is rather impossible to compute results with sufficiently Whereas it is with some effort possible to obtain numerical solutions of the BUU (cf. sect.…”

mentioning

confidence: 99%

“…frame. The correlation function (10) can be expressed as where sl; = (pl + p2)2, and da/dflcm is the differential cross-section in the nucleon 2 dflm W(12 l 34) Z -312 ·6 (P1 +P2 ·· Ps -P4)» (13) 1 (IU (4) '-it reads the case of elastic scattering, to which we confine ourselves in the present paper, rate. This transition rate is expressed in terms of the scattering cross-section.…”

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confidence: 99%

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Stochastic multi-fluid models for intermediate-energy heavy-ion collisions

Ayık

Ivanov²,

Russkikh³

et al. 1994

Nuclear Physics A

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models describe an average evolution of an ensemble of systems. Therefore, these "molecular chaos assumption" in the derivation of such kinetic equations, these are neglected in all these single-particle models. As is evident, e.g., from the Many-body correlations, other than those leading to the binary collision term, models have the great advantage of being fast numerically solvable [14, 15].the description of gross properties of the phase-space distribution, these multi-fluid one obtains a closed set of equations for the collective variables. By keeping only relevant collective quantities. Using local equilibrium distributions for each fluid, multi-fluid models the local momentum distribution is parametrized by a set of models have been developed for describing nuclear collisions [2, 3,14, 15]. In these As an alternative to the simulations by kinetic equations, mean-field multi-iiuid been recently applied to heavy-ion collisions at intermediate energies [11,12,13].Uehling-Uhlenbeck (BUU) type [1, 2, 3, 4,5,6, 7,8,9, 10]. Such equations have self-consistent mesonic mean fields and a binary collision term of the Boltzmann space distribution function which is determined by a transport equation containing In the semi-classical limit the Wigner function reduces to a single-particle phaseWigner transform (Wigner function) rather than by its many-body density matrix. transport models the system is represented by its one-body density matrix or its single-particle transport models based on effective quantum-field theories. In these Many aspects of nuclear collisions can be described in terms of relativistic dom can be naturally performed according to refs. [2, 3, l4, 15, 23] OCR Output *A generalization to inelastic interactions and to an explicit treatment of isospin degrees of free we obtain a stochastic BUU-type equation the nucleon spin-isospin degeneracy factor, respectively. In the semiclassical limit induce fluctuations by propagating correlations in the phase space. These two the momentum distribution of the constituent particles and, in addition, (ii) they dynamical evolution of a system: they produce dissipation by randomizing the main results of the model. Binary collisions play a twofold role during the effective-field theory was presented in ref.[22]. Here we give a brief survey and A derivation of the relativistic BLE in the framework of the Walecka-type

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Subthreshold K + Production on Nuclei by π + Mesons

Efremov

Paryev

1995

Mesons and Light Nuclei ’95

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The inclusive K + mesons production in π + -nucleus reactions in the subthreshold energy regime is analyzed with respect to the one-step (π + n → K + Λ) and the twostep (π + n → ηp 1 , ηp 2 → K + Λ) incoherent production processes on the basis of an appropriate folding model, which allows one to take into account the various forms of an internal nucleon momentum distribution as well as on-and off-shell propagation of the struck target nucleon. Contrary to proton-nucleus reactions primary reaction channel is found to be significant practically at all considered energies. Detailed predictions for the K + total and invariant differential cross sections from π + C 12 -and π + Pb 208collisions at subthreshold energies are provided.

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Subthreshold K+-production in proton-nucleus reactions

Cited by 80 publications

References 20 publications

Quantal effects on spinodal instabilities in charge asymmetric nuclear matter

Quantal effects on spinodal instabilities in charge asymmetric nuclear matter

Stochastic multi-fluid models for intermediate-energy heavy-ion collisions

Subthreshold K + Production on Nuclei by π + Mesons

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