Neutral strange particle production and inelastic cross section in<i>p¯</i>+Ta reaction at 4 GeV/<i>c</i>

Miyano, K.; Noguchi, Y.; Yoshimura, Y.; Fukawa, M.; Ochiai, F.; Sato, Takahiro; Sugahara, R.; Suzuki, A.; Takahashi, K.; Fujiwara, N.; Noguchi, S.; Yamashita, S.; Ono, Akira; Chikawa, M.; Kusumoto, O.; Okusawa, T.

doi:10.1103/physrevc.38.2788

Cited by 22 publications

(15 citation statements)

References 66 publications

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“…We are not aware of any K+-nucleus results. (gnucleus data also have been reported [7,8] at very low energies of 4 and 0.6 GeV/c. ) Theoretical work has examined the exciting possibility that strangeness enhancement (over the hadron-nucleon case) might be indicative of the formation of a quarkgluon plasma [9].…”

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confidence: 73%

Neutral-strange-particle production in 200-Gev/cpπ+K+
Brick¹,
Widgoff²,
Beillière³
et al. 1992
Phys. Rev. D
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We have used the Fermilab 30-in. bubble-chamber-hybrid spectrometer to study neutral-strangeparticle production in the interactions of 200-GeV/c protons and a+ and K + mesons with nuclei of gold, silver, and magnesium. Average multiplicities and inclusive cross sections for KO and A are measured, and a power law is found to give a good description of their A dependence. The exponent characterizing the A dependence is consistent with being the same for KO and A production, and also the same for proton and at beams. Average KO and A multiplicities, as well as their ratio, have been measured as functions of the numbers of projectile collisions v, and secondary collisions v, in the nucleus, and indicate that rescattering contributes significantly to enhancement of A production but not to KO production. The properties of events with multiple KO' s or A's also corroborate this conclusion. KO rapidities are in the central region and decrease gently with increasing v,, while A rapidities are in the targetfragmentation region and are independent of v,. KO and A multiplicities increase with the rapidity loss of the projectile, but their rapidities do not.PACS number(s): 13.85. Ni, 25.40.Ve,

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confidence: 73%

Neutral-strange-particle production in 200-Gev/cpπ+K+
Brick¹,
Widgoff²,
Beillière³
et al. 1992
Phys. Rev. D
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“…The interest to strangeness production inp-nucleus interactions was originally related to the mechanism of strangeness enhancement in a quark-gluon plasma (QGP) proposed by Rafelski and Müller in early 80's for relativistic heavy-ion collisions [1]. This idea has driven several experiments at BNL [2,3], LEAR [4] and KEK [5]. Although the following-up theoretical analyses within the intranuclear cascade (INC) models [6,7] seem to support the usual mechanism of strangeness production in terms of binary hadron-hadron collisions, the collected experimental data constitute a very useful base for testing newly developing theoretical models needed in view of forthcoming experiments with antiproton beams at FAIR.…”

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confidence: 99%

Strangeness production in antiproton-nucleus annihilation

Larionov

Gaitanos

Lenske

et al. 2012

EPJ Web of Conferences

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Abstract.The results of the microscopic transport calculations ofp-nucleus interactions within a GiBUU model are presented. The dominating mechanism of hyperon production is the strangeness exchange processesKN → Yπ andKN → ΞK. The calculated rapidity spectra of Ξ hyperons are significantly shifted to forward rapidities with respect to the spectra of S = −1 hyperons. We argue that this shift should be a sensitive test for the possible exotic mechanisms ofp-nucleus annihilation. The production of the double Λ-hypernuclei by Ξ − interaction with a secondary target is calculated.

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“…A number of interesting phenomena were observed, e.g., the delayed fission from the decay of hypernuclei in antiproton annihilations on heavy nuclei [13], unexpected enhancement of the Λ/K 0 S ratio [14], decay mode of highly excited nucleus etc [15,16]. The low-energy antiprotons usually annihilate at the nucleus surface because of the large absorption cross section.…”

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Unexpected neutron/proton ratio and isospin effect in low-energy antiproton-induced reactions

Zhu

2017

Phys. Rev. C

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The inclusive spectra of preequilibrium nucleons produced in low-energy antiproton-nucleus collisions are thoroughly investigated within the framework of the Lanzhou quantum molecular dynamics model for the first time. All possible reaction channels such as elastic scattering, annihilation, charge exchange and inelastic scattering in antibaryon-baryon, baryon-baryon and meson-baryon collisions have been included in the transport model. The unexpected neutron/proton ratio in comparison to the pion and proton induced reactions is caused from the isospin effects of pion-nucleon collisions and the density dependence of symmetry energy. It is found that the π − -neutron collisions enhance the neutron emission in the antiproton annihilation in a nucleus. Different to heavy-ion collisions, the isospin effects are pronounced at the low kinetic energies. A soft symmetry energy with the stiffness of γs =0.5 at subsaturation densities is constrained from the available data of the neutron/proton spectra. On the other hand, the antiproton-nucleus collisions are motivated to many interesting issues, i.e., charmonium physics, strangeness physics, antiprotonic atom, symmetry, in-medium properties of hadrons, cold quark-gluon plasma, highly excited nucleus etc [7,8]. Recently, the antiproton-antiproton interaction was investigated by the STAR collaboration in relativistic heavy-ion collisions [9].In the past decades, the nuclear reactions induced by antiprotons were investigated with the facilities of the low-energy antiproton ring (LEAR) at CERN [10], the National Laboratory for High Energy Physics at KEK [11] and Brookhaven National Laboratory Alternating Gradient Synchrotron (AGS) accelerator [12]. A number of interesting phenomena were observed, e.g., the delayed fission from the decay of hypernuclei in antiproton annihilations on heavy nuclei [13], unexpected enhancement of the Λ/K 0 S ratio [14], decay mode of highly excited nucleus etc [15,16]. The low-energy antiprotons usually annihilate at the nucleus surface because of the large absorption cross section. The huge annihilation energy are available for producing the 2-6 pions [17,18]. The subsequent processes are complicated and also associated with the multiple pion-nucleon interaction, which result in the fragmentation of target nucleus and the preequilibrium emissions of complex particles [19,20].The dynamics of the antiproton-nucleus collisions is more complicated in comparison to hadron (proton, π, K etc) induced reactions and to heavy-ion collisions, in which the particles produced in the annihilation of the antiproton in a nucleus are coupled to the subsequent collisions with surrounding nucleons. The dynamics of antiproton-nucleus collisions is complicated, which is associated with the mean-field potentials of hadrons in nuclear medium, and also coupled to a number of reaction channels, i.e., the annihilation channels, charge-exchange reaction, elastic and inelastic collisions. There has been several approaches for describing the nuclear dynamics induced by anti...

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Neutral strange particle production and inelastic cross section inp¯+Ta reaction at 4 GeV/c

Cited by 22 publications

References 66 publications

Neutral-strange-particle production in 200-Gev/cpπ+K+
Brick¹,
Widgoff²,
Beillière³
et al. 1992
Phys. Rev. D
Self Cite
10
0
4
0
View full text Add to dashboard Cite

Neutral-strange-particle production in 200-Gev/cpπ+K+
Brick¹,
Widgoff²,
Beillière³
et al. 1992
Phys. Rev. D
Self Cite
10
0
4
0
View full text Add to dashboard Cite

Strangeness production in antiproton-nucleus annihilation

Unexpected neutron/proton ratio and isospin effect in low-energy antiproton-induced reactions

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Neutral strange particle production and inelastic cross section inp¯+Ta reaction at 4 GeV/c

Cited by 22 publications

References 66 publications

Neutral-strange-particle production in 200-Gev/cpπ+K+Brick1, Widgoff2, Beillière3 et al. 1992Phys. Rev. DSelf Cite10040View full textAdd to dashboardCite

Neutral-strange-particle production in 200-Gev/cpπ+K+Brick1, Widgoff2, Beillière3 et al. 1992Phys. Rev. DSelf Cite10040View full textAdd to dashboardCite

Strangeness production in antiproton-nucleus annihilation

Unexpected neutron/proton ratio and isospin effect in low-energy antiproton-induced reactions

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Neutral-strange-particle production in 200-Gev/cpπ+K+
Brick¹,
Widgoff²,
Beillière³
et al. 1992
Phys. Rev. D
Self Cite
10
0
4
0
View full text Add to dashboard Cite

Neutral-strange-particle production in 200-Gev/cpπ+K+
Brick¹,
Widgoff²,
Beillière³
et al. 1992
Phys. Rev. D
Self Cite
10
0
4
0
View full text Add to dashboard Cite