TY - JOUR T1 - Ballistic Focusing of Polyenergetic Protons Driven by Petawatt Laser Pulses JO - Physical Review Letters PY - 2011/06/02 AU - Kar S AU - Markey K AU - Borghesi M AU - Carroll DC AU - McKenna P AU - Neely D AU - Quinn MN AU - Zepf M ED - DO - DOI: 10.1103/physrevlett.106.225003 PB - American Physical Society (APS) VL - 106 IS - 22 Y2 - 2024/10/23 ER -