Search for energy and target effects in anomalous projectile fragment production

The anomalous mean free path for 1500 secondary interactions of projectile fragments produced by 5000 primary collisions of ${}_{}{}^{84}{}_{}{}^{}\mathrm{Kr}$ beam tracks at $1.52A$ GeV has been observed at a length of $L<\mathrm{}1.5\mathrm{}$ cm from their production point in nuclear emulsion. At energy $E>\mathrm{}1.1A$ GeV, the anomalous mean free path is independent of the target size, i.e., light (CNO) or heavy (AgBr), but at low energy $0.5<E<~1.1A$ GeV, the anomalous mean free path seems to appear with heavy targets.