I am trying to look up StoppingPowerData for a number of elements and while this snippet works for several I have tried (Aluminum, Lead, Iron for example), I get a result of (not available), but no error, when I try with others, such as Carbon. I've tried specifying an isotope of Carbon as well as different incoming particles and different energies.
StoppingPowerData[Entity["Element", "Carbon"],
{"Particle" -> "Proton", "Energy" -> Quantity[500, "Kiloelectronvolts"]}, "LinearStoppingPower"]
Does anyone know what the issue might be?
Thanks.