Liang, E.Clarke, T.Henderson, A.Fu, W.Lo, W.Taylor, D.Chaguine, P.Zhou, S.Hua, Y.Cen, X.Wang, X.Kao, J.Hasson, H.Dyer, G.Serratto, K.Riley, N.Donovan, M.Ditmire, T.2016-04-042016-04-042015Liang, E., Clarke, T., Henderson, A., et al.. "High e+/e− Ratio Dense Pair Creation with 1021W.cm−2 Laser Irradiating Solid Targets." <i>Scientific Reports,</i> 5, (2015) Macmillan Publishers Limited: http://dx.doi.org/10.1038/srep13968.https://hdl.handle.net/1911/88827We report results of new pair creation experiments using ~100 Joule pulses of the Texas Petawatt Laser to irradiate solid gold and platinum targets, with intensities up to ~1.9 × 10(21) W.cm(-2) and pulse durations as short as ~130 fs. Positron to electron (e+/e-) ratios >15% were observed for many thick disk and rod targets, with the highest e+/e- ratio reaching ~50% for a Pt rod. The inferred pair yield was ~ few ×10(10) with emerging pair density reaching ~10(15)/cm(3) so that the pair skin depth becomes < pair jet transverse size. These results represent major milestones towards the goal of creating a significant quantity of dense pair-dominated plasmas with e+/e- approaching 100% and pair skin depth ≪ pair plasma size, which will have wide-ranging applications to astrophysics and fundamental physics.engThis work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material.Journal articlehttp://dx.doi.org/10.1038/srep13968