# $K^+$ production in the reaction $^{58}$Ni + $^{58}$Ni at incident energies from 1 to 2 A GeV

Abstract : Semi-inclusive triple differential multiplicity distributions of positively charged kaons have been measured over a wide range in rapidity and transverse mass for central collisions of $^{58}$Ni with $^{58}$Ni nuclei. The transverse mass ($m_t$) spectra have been studied as a function of rapidity at a beam energy 1.93 AGeV. The $m_t$ distributions of K^+ mesons are well described by a single Boltzmann-type function. The spectral slopes are similar to that of the protons indicating that rescattering plays a significant role in the propagation of the kaon. Multiplicity densities have been obtained as a function of rapidity by extrapolating the Boltzmann-type fits to the measured distributions over the remaining phase space. The total K^+ meson yield has been determined at beam energies of 1.06, 1.45, and 1.93 AGeV, and is presented in comparison to existing data. The low total yield indicates that the K^+ meson can not be explained within a hadro-chemical equilibrium scenario, therefore indicating that the yield does remain sensitive to effects related to its production processes such as the equation of state of nuclear matter and/or modifications to the K^+ dispersion relation.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00003629
Submitted on : Monday, April 26, 1999 - 1:23:39 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:03 PM

### Citation

D. Best, N. Herrmann, B. Hong, M. Kirejczyk, J. Ritman, et al.. $K^+$ production in the reaction $^{58}$Ni + $^{58}$Ni at incident energies from 1 to 2 A GeV. Nuclear Physics A, Elsevier, 1997, 625, pp.307-324. ⟨in2p3-00003629⟩

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