Kaon production in nucleus - nucleus collisions at 92 MeV per nucleon

Lecolley, F.R.; Alamanos, N.; Bianchi, L.; Cassagnou, Y.; Dabrowski, H.; Erazmus, B.; Julien, J.; Hameau, P.; Lebrun, D.; Brun, C. Le; Lecolley, J.F.; Légrain, R.; Mougeot, A.; Perrin, G.; Saintignon, P. de; Sida, J. L.; Wieleczko, J. P.

doi:10.1016/0375-9474(94)00690-o

Cited by 9 publications

(13 citation statements)

References 2 publications

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“…Thus the kaon production yield of (2.9±1.6) · 10 −9 b claimed in Ref. [48] for this system cannot be described in the on-shell limit, however, also not in our off-shell approach which shows only a small enhancement in the high √ s regime.…”

Section: Nucleus-nucleus Collisions At Ganil Energiesmentioning

confidence: 54%

“…Now replacing the elementary differential photon cross section dσ pn→pnγ ( √ s)/dΩ by the elementary kaon production cross section dσ N N →KΛN ( √ s) [60] and correcting for isospin we obtain an inclusive kaon production cross section σ K ≈ 1.6 · 10 −11 b (E 0 = 33 MeV) and ≈ 6 · 10 −11 b (E 0 = 35 MeV) for Ar + T a at 92 A MeV, which is about two orders of magnitude smaller than the cross section from Ref. [48]. Moreover, a note of caution has to be added here: In view of the analysis in Refs.…”

Section: Nucleus-nucleus Collisions At Ganil Energiesmentioning

confidence: 57%

“…We, furthermore, calculate upper limits for kaon production in Ar + T a reactions at 92 A MeV and compare to the experiment from Ref. [48]. A summary and discussion of open problems concludes this study in Section 5.…”

Section: Introductionmentioning

confidence: 84%

“…The question now arises if the kaon yield from Ref. [48] for Ar + T a at 92 A MeV might also be due to off-shell hadronic states in the final channel. We thus have performed calculations for this system again within the following assumptions: Γ N X = Γ Λ X and Γ K X = 0 since the KN cross section is rather small [60].…”

Section: Nucleus-nucleus Collisions At Ganil Energiesmentioning

confidence: 99%

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Semiclassical transport of particles with dynamical spectral functions

2000

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The conventional transport of particles in the on-shell quasiparticle limit is extended to particles of finite life time by means of a spectral function A(X, P , M 2 ) for a particle moving in an area of complex self-energy Σ ret X = ReΣ ret X − iΓ X /2. Starting from the Kadanoff-Baym equations we derive in first order gradient expansion equations of motion for testparticles with respect to their time evolution in X, P and M 2 . The off-shell propagation is demonstrated for a couple of model cases that simulate hadron-nucleus collisions. In case of nucleus-nucleus collisions the imaginary part of the hadron self-energy Γ X is determined by the local space-time dependent collision rate dynamically. A first application is presented for A + A reactions up to 95 A MeV, where the effects from the off-shell propagation of nucleons are discussed with respect to high energy proton spectra, high energy photon production as well as kaon yields in comparison to the available data from GANIL.

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Section: Nucleus-nucleus Collisions At Ganil Energiesmentioning

confidence: 54%

Section: Nucleus-nucleus Collisions At Ganil Energiesmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 84%

Section: Nucleus-nucleus Collisions At Ganil Energiesmentioning

confidence: 99%

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Semiclassical transport of particles with dynamical spectral functions

2000

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“…A while ago it has been reported that kaons have been observed in a heavy ion reaction at an energy as low as 92 AMeV [23]. Recently this experiment has been repeated with a comparable result (σ K + = 2.9 ± 1.6 · 10 −9 b for the reaction Ar + Ta at 92 MeV/N) [24]. It should be noted that the necessary center of mass energy to produce a kaon is 671 MeV + twice the mass of the nucleons.…”

Section: Resultsmentioning

confidence: 72%

Beyond mean field confrontation of different models with high transverse momentum proton spectra

Germain¹,

Hartnack²,

Laville³

et al. 1998

Physics Letters B

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Several models have been proposed to simulate heavy ion reactions beyond the mean field level. The lack of data in phase space regions which may be sensitive to different treatments of fluctuations made it difficult to judge these approaches. The recently published high energy proton spectra, measured in the reaction 94 AMeV Ar + Ta, allow for the first time for a comparison of the models with data. We find that these spectra are reproduced by Quantum Molecular Dynamics (QMD) and BoltzmannÜhling Uhlenbeck (BUU) calculations. Models like Boltzmann Langevin (BL) in which additional fluctuations in momentum space are introduced overpredict the proton yield at very high energies. The BL approach has been successfully used to describe the recently measured very subthreshold kaon production assuming that the fluctuations provide the necessary energy to overcome the threshold in two body collisions. Our new findings suggest that the very subthreshold kaon production cannot be due to two body scattering and thus remains a open problem.

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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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Kaon production in nucleus - nucleus collisions at 92 MeV per nucleon

Cited by 9 publications

References 2 publications

Semiclassical transport of particles with dynamical spectral functions

Semiclassical transport of particles with dynamical spectral functions

Beyond mean field confrontation of different models with high transverse momentum proton spectra

Subthreshold K + Production on Nuclei by π + Mesons

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