Update README.md

README.md

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 license: mit
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+# Structure
+
+Each dataset folder contains: a pickle file data_prepped.pt with a data tensor, a meta.json file with meta data, a gen.py script that was used to generate the data.
+
+# Current Datasets
+
+* ### rp_20M_cu_130426:
+
+  * 1 cm edge length copper cube
+  * random position and momentum direction
+  * incoming energy 20 MeV to 300 MeV
+  * incoming particles gamma, e-, e+
+  * density 0.5 to 10 g/cm3
+
+* ### rp_lqar_full_er_260526:
+
+  * 10 cm edge length liquid argon cube
+  * random position and momentum direction
+  * incoming energy 10 MeV to 300 MeV
+  * incoming particles gamma, e-, e+
+  * density 0.5 to 10 g/cm3