Reanalysis of antiproton production in proton-nucleus and nucleus-nucleus reactions at subthreshold energies

Sibirtsev, A.; Cassing, W.; Lykasov, G. I.; Rzjanin, M.V.

doi:10.1016/s0375-9474(97)00809-9

Cited by 29 publications

(47 citation statements)

References 44 publications

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“…Whereas the rather high antibaryon yield in nucleus-nucleus collisions at AGS and SPS energies can be attributed to multimeson fusion channels employing detailed balance [43,44,45] the experimental data in proton-nucleus collisions at AGS energies appear to be compatible with primary proton-nucleon and secondary meson-baryon production channels as also found in Ref. [16] for lower energies.…”

Section: Discussionsupporting

confidence: 77%

“…4) essentially tests the adequacy of the elementary differentialp production cross section in pN collisions which appears to be underestimated slightly (by about 30%) in the present approach using the input from Ref. [16] and assuming that the data point for y = 1.1 is solid. One might rescale the elementary cross section accordingly, however, the focus of our present work is not on fitting data.…”

Section: Comparison To Datamentioning

confidence: 68%

“…[16] it was found that a dominant fraction of antiprotons emerge from secondary pion-nucleon reactions in p + A reactions at lower energies. Such secondary reaction channels might also be a reason for the observations of Ref.…”

Section: Qualitative Considerationsmentioning

confidence: 99%

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Probing hadronic formation times with antiprotons in p+A reactions at AGS energies

Cassing

Bratkovskaya²,

Hansén

2002

Nuclear Physics A

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The production of antiprotons in p + A reactions is calculated in a microscopic transport approach employing hadronic and string degrees of freedom (HSD). It is found that the abundancies of antiprotons as observed by the E910 Collaboration in p + A reactions at 12.3 GeV/c as well as 17.5 GeV/c can approximately be described on the basis of primary proton-nucleon and secondary meson-baryon production channels for all targets. The transport calculations demonstrate that the antiproton rapidity distributions for heavy targets are sensitive to thep (or hadron) formation time in the nuclear medium. Within our analysis the data from the E910 Collaboration are reasonably described with a formation time of 0.4 − 0.8 fm/c in the hadron rest frame.

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Section: Discussionsupporting

confidence: 77%

Section: Comparison To Datamentioning

confidence: 68%

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Probing hadronic formation times with antiprotons in p+A reactions at AGS energies

Cassing

Bratkovskaya²,

Hansén

2002

Nuclear Physics A

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“…This mechanism was also used in Refs. [20,21] to explain subthreshold antibaryon production in pA and AA collisions.…”

Section: Introductionmentioning

confidence: 99%

“…The calculations of Refs. [20,21] show that such a contribution can reach 100 − 150 MeV for slow antinucleons at normal nuclear density.…”

mentioning

confidence: 98%

Antibaryons bound in nuclei

et al. 2005

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We study the possibility of producing a new kind of nuclear systems which in addition to ordinary nucleons contain a few antibaryons (B = p, Λ, etc.). The properties of such systems are described within the relativistic mean-field model by employing G-parity transformed interactions for antibaryons. Calculations are first done for infinite systems and then for finite nuclei from 4 He to 208 Pb. It is demonstrated that the presence of a real antibaryon leads to a strong rearrangement of a target nucleus resulting in a significant increase of its binding energy and local compression. Noticeable effects remain even after the antibaryon coupling constants are reduced by factor 3 − 4 compared to G-parity motivated values. We have performed detailed calculations of the antibaryon annihilation rates in the nuclear environment by applying a kinetic approach. It is shown that due to significant reduction of the reaction Q-values, the in-medium annihilation rates should be strongly suppressed leading to relatively long-lived antibaryonnucleus systems. Multi-nucleon annihilation channels are analyzed too. We have also estimated formation probabilities of bound B + A systems in pA reactions and have found that their observation will be feasible at the future GSI antiproton facility. Several observable signatures are proposed. The possibility of producing multi-quark-antiquark clusters is discussed.

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Exploring the nuclear potential of antihyperons with antiprotons at ${\overline{\rm\bf P}}{\rm\bf ANDA}$

Pochodzalla¹

2009

Exa/Leap 2008

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Reanalysis of antiproton production in proton-nucleus and nucleus-nucleus reactions at subthreshold energies

Cited by 29 publications

References 44 publications

Probing hadronic formation times with antiprotons in p+A reactions at AGS energies

Probing hadronic formation times with antiprotons in p+A reactions at AGS energies

Antibaryons bound in nuclei

Exploring the nuclear potential of antihyperons with antiprotons at ${\overline{\rm\bf P}}{\rm\bf ANDA}$

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