Chinese Physics C > 1981, Vol. 5 > Issue(1): 29-38

PROTON-NUCLEUS SCATTERING IN A THERMODYNAMICAL FIREBALL MODEL

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We attempt use a simple fireball model to explain the slow rise of the ratio R_A≡〈N _A〉/〈N _N〉 of the charged multiplicity for proton-nucleus scattering to that for proton-proton scattering verses the apparent nuclear thickness v. The pseudo-rapidity distribution dN_A/d_ηis also discussed. In this model, the pi mesons are emitted by fireballs created during nucleon-nucleon scattering. When the incident energy E _labZ 50 GeV/ c ², these fire-balls take so long a time to expend to thermal equilibrium that the fireballs have passed through the nucleus completely before pions are emitted. As a result, the charged multiplicity is greatly reduced.This model gives excellent fittings to pp charged mutiplicity, R_Averses vas well as R _emalsionverses E _labwithout any free theoretical parameter. By choosing only one parameter for the equilibrium of angular momentum, dN_A/d_ηcan be fitted satisfactorily except for the large pseudo-rapidity region.

References

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W. Busza, in High Energy Physics and Nuclear B'Eructure, 1975, Proc. of the 6th Inter. Conf Santa Fo and Los Alemns. edited by D. E. Nacle et al..(AIP. New York, 1975) .[2] W. Busza et al.. In Proc. of the XVIII Intor. Conf. on Hing Energy Physics. Tbilisi. 1976 edited by N. N. Bogaliubow et al (JINR, Dnbna, U. S. S. R., 1977).[3] E.Fermi, Prog. Thaor. Phys., 5(1950), 570.[4] E.Feitni. Phys. Rev., 81(1951). 683.[5] T.C. Mangy, Phys. Rev., D9(1974), 3062.[6] M. E. Law et al., Lawroneo Berkeley Laboratory No. LBL-80, 1972 (unpublished).[7] G. Bialkowski, C. B. Chiw and D. M. Tow, Phys. Rev., D17(1978), 862.[8] K. Gott.friod, Phys. Rev. Lett., 32(1974), 957.

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WU JING-YUAN and XIE YI-CHENG. PROTON-NUCLEUS SCATTERING IN A THERMODYNAMICAL FIREBALL MODEL[J]. Chinese Physics C, 1981, 5(1): 29-38.

WU JING-YUAN and XIE YI-CHENG. PROTON-NUCLEUS SCATTERING IN A THERMODYNAMICAL FIREBALL MODEL[J]. Chinese Physics C, 1981, 5(1): 29-38. shu

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Received: 1979-08-29
Revised: 1900-01-01

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

PROTON-NUCLEUS SCATTERING IN A THERMODYNAMICAL FIREBALL MODEL

WU JING-YUAN
XIE YI-CHENG

Received Date:1979-08-29
Accepted Date:1900-01-01
Available Online:1981-05-05

Abstract:We attempt use a simple fireball model to explain the slow rise of the ratioR_A≡〈N_A〉/〈N_N〉 of the charged multiplicity for proton-nucleus scattering to that for proton-proton scattering verses the apparent nuclear thicknessv. The pseudo-rapidity distributiondN_A/d_ηis also discussed. In this model, the pi mesons are emitted by fireballs created during nucleon-nucleon scattering. When the incident energyE_labZ 50 GeV/c², these fire-balls take so long a time to expend to thermal equilibrium that the fireballs have passed through the nucleus completely before pions are emitted. As a result, the charged multiplicity is greatly reduced.This model gives excellent fittings to pp charged mutiplicity,R_Aversesvas well asR_emalsionversesE_labwithout any free theoretical parameter. By choosing only one parameter for the equilibrium of angular momentum,dN_A/d_ηcan be fitted satisfactorily except for the large pseudo-rapidity region.