The physics of nucleon-antinucleon annihilation

Dover, C.B.; Gutsche, Th.; Maruyama, Masahiro; Faessler, Amand

doi:10.1016/0146-6410(92)90004-l

Cited by 176 publications

(185 citation statements)

References 215 publications

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“…Relativistic transport calculations have indicated that all the low energy data from proton-nucleus and nucleus-nucleus collisions are compatible with attractivep self energies (at normal nuclear matter density ρ 0 ) in the order of -100 to -150 MeV [16,17,18]. However, it had been stressed at that time that the high antiproton yield might also be attributed to mesonic production channels [19] since pp annihilation leads to multi-pion final states with an average abundancy of 5 pions [20].…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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 mean life time of an antiproton in nucleonic matter of density ρ B can be estimated as τ =< σ A v rel ρ B > −1 , where angular brackets denote averaging over the wave function of the antiproton and v rel is its relative velocity with respect to nucleons. In vacuum the NN annihilation cross section at low v rel can be parametrized as [21] σ A = C + D/v rel with C=38 mb and D=35 mb. For < ρ B >≃ 2ρ 0 this would lead to a very short life time, τ ≃ 0.7 fm/c (for v rel ≃ 0.2).…”

Section: Structure Of Nuclei Containing Antiprotonsmentioning

confidence: 99%

Enhanced binding and cold compression of nuclei due to admixture of antibaryons

et al. 2002

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We discuss the possibility of producing a new kind of nuclear system by putting a few antibaryons inside ordinary nuclei. The structure of such systems is calculated within the relativistic mean-field model assuming that the nucleon and antinucleon potentials are related by the G-parity transformation. The presence of antinucleons leads to decreasing vector potential and increasing scalar potential for the nucleons. As a result, a strongly bound system of high density is formed. Due to the significant reduction of the available phase space the annihilation probability might be strongly suppressed in such systems.

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“…The Division de Physique Théorique is a Research Unit of the Universities Paris 11 and 6 associated to CNRS. [6], [7], and is indistinguishable (on the scale of the figure) from a Gaussian distribution of the same mean and variance.…”

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confidence: 99%

Coherent pion radiation from nucleon-antinucleon annihilation

et al. 1994

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A unified picture of nucleon antinucleon annihilation into pions emerges from a classical description of the pion wave produced in annihilation and the subsequent quantization of that wave as a coherent state. When the constraints of energy-momentum and iso-spin conservation are imposed on the coherent state, the pion number distribution and charge ratios are found to be in excellent agreement with experiment.

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The physics of nucleon-antinucleon annihilation

Cited by 176 publications

References 215 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

Enhanced binding and cold compression of nuclei due to admixture of antibaryons

Coherent pion radiation from nucleon-antinucleon annihilation

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