Unusual Behavior of Projectile Fragments from the Interaction of Copper with Relativistic Ar Ions

G. Dersch; R. Beckmann; G. Feige; T. Lund; P. Vater; R. Brandt; E. Ganssauge; K. Aleklett; E. M. Friedlander; P. L. McGaughey; G. T. Seaborg; W. Loveland; J. Herrmann; N. T. Porile

doi:10.1103/PhysRevLett.55.1176

Unusual Behavior of Projectile Fragments from the Interaction of Copper with Relativistic Ar Ions

G. Dersch, R. Beckmann, G. Feige, T. Lund, P. Vater, R. Brandt, E. Ganssauge, K. Aleklett, E. M. Friedlander, P. L. McGaughey, G. T. Seaborg, W. Loveland, J. Herrmann, and N. T. Porile

Phys. Rev. Lett. 55, 1176 – Published 9 September 1985

Abstract

Projectile fragments formed in the interaction of $0.9 A$ - and $1.8 A$ -GeV ${}^{40}{Ar}$ ions with a Cu disk interact with a second Cu disk and the relative yields of products in the two disks are measured by radioactivation techniques as a function of the distance between them. The data at $1.8 A$ GeV demand either (1) decay in flight ( $t_{\frac{1}{2}} \approx 10^{- 10}$ s) of some projectile fragments having large cross sections or (2) production of secondaries with unexpectedly large transverse momenta.

Received 28 January 1985

DOI:https://doi.org/10.1103/PhysRevLett.55.1176

Authors & Affiliations

G. Dersch, R. Beckmann, G. Feige, T. Lund^*, P. Vater, and R. Brandt

Kernchemie, Philipps Universität, 3550 Marburg, Federal Republic of Germany

E. Ganssauge

Fachbereich Physik, Phillips Universität, 3550 Marburg, Federal Republic of Germany

K. Aleklett

The Studsvik Science Research Laboratory, S 611 82 Nykoping, Sweden

E. M. Friedlander^†, P. L. McGaughey^‡, and G. T. Seaborg

Nuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

W. Loveland

Department of Chemistry, Oregon State University, Corvallis, Oregon 97331

J. Herrmann and N. T. Porile

Department of Chemistry, Purdue University, West Lafayette, Indiana 47907

^*Present address: Tulipanveien 27, N-4300 Sandes, Norway.
^†Present address: Kernchemie, Phillips Universität, 3550 Marburg, Federal Republic of Germany.
^‡Present address: Los Alamos National Laboratory, Los Alamos, N. Mex. 87545.