Strong Coulomb effects on pions produced in heavy ion collisons

Journal Article · Mon Mar 01 04:00:00 EST 1982 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.25.1499· OSTI ID:1134595

Sullivan, J. P. ^[1]; Bistirlich, J. A. ^[1]; Bowman, H. R. ^[1]; Bossingham, R. ^[1]; Buttke, T. ^[1]; Crowe, K. M. ^[1]; Frankel, K. A. ^[1]; Martoff, C. J. ^[1]; Miller, J. ^[1]; Murphy, D. L. ^[1]; Rasmussen, J. O. ^[1]; Zajc, W. A. ^[1]; Hashimoto, O. ^[2]; Koike, M. ^[2]; Péter, J. ^[3]; Benenson, W. ^[4]; Crawley, G. M. ^[4]; Kashy, E. ^[4]; Nolen, Jr., J. A. ^[4]

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1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
2. Univ. of Tokyo (Japan); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
3. Inst. de Physique Nucleaire (IPN), Orsay (France)
4. Michigan State Univ., East Lansing, MI (United States)

We present doubly differential cross sections for the production of π⁺ and π^- near the velocity of the incident beam for pion laboratory angles from 0 to 20 degrees. Beams of ²⁰Ne with E/A=280, 380, and 480 MeV and ⁴⁰Ar with EA=535 MeV incident on C, NaF, KCl, Cu, and U targets were used. A sharp peak in the π^- spectrum and a depression in the π⁺ spectrum is observed at 0° near the incident projectile velocity. The effect is explained in terms of Coulomb interactions between pions and fragments of the incident beam. Least squares fits to the data using the Coulomb correction formulas of Gyulassy and Kauffmann and an effective projectile fragment charge are made. In conclusion, the relationship between these data and previously measured projectile fragmentation data is discussed and a simple parametrization of projectile mass, target mass, and beam energy dependence of the differential cross sections is given.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1134595
• Report Number(s): LBL--11971
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 25; ISSN 0556-2813
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Coulomb effects
deduced projectile fragment charges