Subthreshold antiproton production in heavy ion collisions at SIS-energies

Schröter, Achim; Berdermann, E.; Geißel, H.; Gillitzer, A.; Homolka, J.; Kienle, P.; Koenig, W.; Povh, Bogdan; Schumacher, Felix F.; Ströher, H.

doi:10.1016/0375-9474(93)90697-v

Cited by 37 publications

(36 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this respect we have performed a systematic study of p-nucleus and nucleus-nucleus collisions in a broad kinematical regime and compared our numerical results to the data from KEK [11] and GSI [12]. We find a consistent description of all data employing a rather weak attractive potential for the antiprotons which is well in line with a dispersive potential extracted from the dominant imaginary part of the antiproton selfenergy due to annihilation.…”

Section: Discussionmentioning

confidence: 58%

“…[9] and ref. [12]; the upper lines represent the results of the calculations for free antiprotons without including any reabsorption. When taking care of antiproton annihilation according to eq.…”

Section: Comparison With Experimental Datamentioning

confidence: 99%

“…Experiments at the JINR [8] and at the BEVALAC [9,10] have provided, furthermore, first measurements of subthreshold antiproton production in nucleus-nucleus collisions. Since then the problem was taken up again at KEK [11] and GSI [12] with new detector setups. Various descriptions for these data have been proposed.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of subthreshold antiproton production inp-nucleus and nucleus-nucleus collisions in the relativistic Boltzmann-Uehling-Uhlenbeck approach

et al. 1994

View full text Add to dashboard Cite

We calculate the subthreshold production of antiprotons in the Lorentzcovariant RBUU approach employing a weighted testparticle method to treat the antiproton propagation and absorption nonperturbatively. We find that the antiproton differential cross sections are highly sensitive to the baryon and antiproton selfenergies in the dense baryonic environment. Adopting the baryon scalar and vector selfenergies from the empirical optical potential for proton-nucleus elastic scattering and from Dirac-Brueckner calculations at higher density ρ > ρ 0 we examine the differential antiproton spectra as a function of the antiproton selfenergy. A detailed comparison with the available experimental data for p-nucleus and nucleus-nucleus reactions shows that the antiproton feels a moderately attractive mean-field at normal nuclear matter density ρ 0 which is in line with a dispersive potential extracted from the free annihilation cross section. † Supported by BMFT, GSI Darmstadt and KFA Jülich.

show abstract

Section: Discussionmentioning

confidence: 58%

Section: Comparison With Experimental Datamentioning

confidence: 99%

See 1 more Smart Citation

Analysis of subthreshold antiproton production inp-nucleus and nucleus-nucleus collisions in the relativistic Boltzmann-Uehling-Uhlenbeck approach

et al. 1994

View full text Add to dashboard Cite

show abstract

“…And more pronounced in-medium effects are expected for the case of K − [24]. Indeed, enhanced production rates for K − have been seen at GSI recently [25].…”

Section: Introductionmentioning

confidence: 95%

“…(25). The importance of the isospin dependent terms can be estimated from the equation of motions for the vector fields in uniform matter…”

Section: A One Boson-exchange Approachmentioning

confidence: 99%

In-medium kaon production at the mean-field level

1997

View full text Add to dashboard Cite

The in-medium mass and energy of kaons and antikaons are studied within the Relativistic Mean Field approach and compared with predictions from chiral models by taking care of kaon-nucleon scattering data. Implications for the subthreshold production of kaons and antikaons in heavy-ion collisions are discussed. We find only small corrections due to in-medium effects on the mean-field level for the relevant production processes for kaons. The production of kaons is even less favourable at high density due to repulsive vector interactions. We conclude that one has to go beyond mean-field approaches and take fluctuations and secondary production processes into account to explain the recently measured enhancement of kaon production at subthreshold energies. The situation is different for antikaons where in-medium effects strongly enhances their production rates. We also see strong in-medium modifications of the annihilation processes of antikaons and Λ's which might be visible in flow measurements. At high density, we predict that the threshold energy for antikaon and Λ production and annihilation become equal leading to similar numbers of antikaons and Λ's in the dense zone of a relativistic heavy ion collision.

show abstract

Realistic Forces and Heavy Ion Collisions

Faessler

1994

NATO ASI Series

View full text Add to dashboard Cite

Subthreshold antiproton production in heavy ion collisions at SIS-energies

Cited by 37 publications

References 3 publications

Analysis of subthreshold antiproton production inp-nucleus and nucleus-nucleus collisions in the relativistic Boltzmann-Uehling-Uhlenbeck approach

Analysis of subthreshold antiproton production inp-nucleus and nucleus-nucleus collisions in the relativistic Boltzmann-Uehling-Uhlenbeck approach

In-medium kaon production at the mean-field level

Realistic Forces and Heavy Ion Collisions

Contact Info

Product

Resources

About