Kaon production in intermediate-energy nuclear collisions

Russkikh, V. N.; Ivanov, Yu. B.

doi:10.1016/0375-9474(92)90557-z

Cited by 23 publications

(15 citation statements)

References 25 publications

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“…If we vary the K + multiplicity within the experimental error bars and take the maximal possible value M K + = 3.2 × 10 −2 , the ratio R Ξ/Λ/K + becomes equal to 0.175 +0. 16 −0.11 instead of the value 0.20 +0. 16 −0.11 presented in Table. I.…”

Section: Discussionmentioning

confidence: 91%

“…16 −0.11 instead of the value 0.20 +0. 16 −0.11 presented in Table. I. The calculated value is still significantly below the experimental range.…”

Section: Discussionmentioning

confidence: 91%

“…There are two independent measurements of the K + yield by KaoS collaboration at the beam energy of 1.8A GeV for C+C collisions [34] and for Ni+Ni collisions [35]. If we scale these results down by A 2 factor with the corresponding value of A (see argumentation in [6,12,16]) we find very similar results: σ C+C /12 2 = (2.1 ± 0.2) × 10 −2 mb and σ Ni+Ni /58 2 = (1.7 ± 0.45) × 10 −2 mb. Taking the median of 0.02 mb we obtain that for the Ar+KCl collision the total inclusive K + production cross section would be equal to σ K + = 31 mb.…”

Section: Discussionmentioning

confidence: 99%

“…For scale-less hydrodynamic expansion, we can express the current fireball volume through the freeze-out volume V fo and some scaling function, V (t) /V fo ; the fireball expansion time can be expressed as t fo = τ V 1/3 fo , see [16]. Hence, we can write…”

Section: B Kaon Event Classesmentioning

confidence: 99%

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Strangeness balance in HADES experiments and theΞ−enhancement

2012

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HADES data on a strangeness production in Ar+KCl collisions at 1.76A GeV are analyzed within a minimal statistical model. The total negative strangeness content is fixed by the observed K + multiplicities on event-by-event basis. Particles with negative strangeness are assumed to remain in chemical equilibrium with themselves and in thermal equilibrium with the environment until a common freeze-out. Exact strangeness conservation in each collision event is explicitly preserved. This implies that Ξ baryons can be released only in events where two or more kaons are produced. An increase of the fireball volume due to application of a centrality trigger in HADES experiments is taken into account. We find that experimental ratios of K − /K + , Λ/K + and Σ/K + can be satisfactorily described provided in-medium potentials are taken into account. However, the calculated Ξ − /Λ/K + ratio proves to be significantly smaller compared to the measured value (8 times lower than the experimental median value and 3 times lower than the lower error bar). Various scenarios to explain observed Ξ enhancement are discussed. Arguments are given in favor of the Ξ production in direct reactions. The rates of the possible production processes are estimated and compared.

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Section: Discussionmentioning

confidence: 91%

“…16 −0.11 instead of the value 0.20 +0. 16 −0.11 presented in Table. I. The calculated value is still significantly below the experimental range.…”

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: B Kaon Event Classesmentioning

confidence: 99%

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Strangeness balance in HADES experiments and theΞ−enhancement

2012

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“…If -for simplicity -we assume ideal hydrodynamics, then the only length scale is given by V 1/3 , where V is the fireball volume, and it must determine also the lifetime [3]. At fixed impact parameter, the probability of creating one ss pair is given as…”

Section: The Minimal Statistical Modelmentioning

confidence: 99%

Reference calculations for subthreshold Ξ production

Tomášik

Kolomeitsev

2016

J. Phys.: Conf. Ser.

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A 320 mV, 6 kb subthreshold 10T SRAM employing voltage lowering techniques Cai Jiangzheng, Zhang Sumin, Yuan Jia et al. Abstract. We present a minimal statistical model designed for the description of rarehadron multiplicities in nucleus-nucleus collisions at energies below the threshold of the particle production in binary elementary collisions. Differences to more conventional canonical statistical model are explained. The minimal statistical model is applied to the description of multiplicity ratios involving Ξ hyperons, which are measured by the HADES collaboration at GSI-SIS. It is argued that the HADES data cannot be reproduced by the model based on the statistical equilibrium and the strangeness conservation. The data remain underpredicted even when inmedium potentials acting on hadrons are taken into account. This hints to non-equilibrium production of the Ξ hyperons and their continuous freeze-out. IntroductionData obtained by HADES collaboration [1] show that doubly strange Ξ hyperon can be produced in nuclear collisions at energies well below the production threshold for nucleonnucleon collisions. In Ar+KCl collisions at E beam = 1.76 AGeV the observed ratio of Ξ to (Λ + Σ 0 ) multiplicities is M Ξ /M Λ+Σ 0 = (5.6 ± 1.2

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