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Re:Size of helium nucleus measured more precisely than ever ... by pacamara619 on Saturday January 30, 2021 @09:47AM (#25969483)
Did you read the article?

"(...) the so- called mean charge radius of the helium nucleus is 1.67824 femtometers (...)"

Re:Size of helium nucleus measured more precisely than ever ... by pmiller2 on Saturday January 30, 2021 @03:21PM (#25972593)
That would be the measured value, not the calculated value.