Nebraska Revised Statutes Chapter 28. Crimes and Punishments § 28-319.01. Sexual assault of a child; first degree; penalty

(1) A person commits sexual assault of a child in the first degree:

(2) Sexual assault of a child in the first degree is a Class IB felony with a mandatory minimum sentence of fifteen years in prison for the first offense.

(3) Any person who is found guilty of sexual assault of a child in the first degree under this section and who has previously been convicted (a) under this section, (b) under section 28-319 of first degree or attempted first degree sexual assault, (c) under section 28-320.01 before July 14, 2006, of sexual assault of a child or attempted sexual assault of a child, (d) under section 28-320.01 on or after July 14, 2006, of sexual assault of a child in the second or third degree or attempted sexual assault of a child in the second or third degree, or (e) in any other state or federal court under laws with essentially the same elements as this section, section 28-319, or section 28-320.01 as it existed before, on, or after July 14, 2006, shall be guilty of a Class IB felony with a mandatory minimum sentence of twenty-five years in prison.

(4) In any prosecution under this section, the age of the actor shall be an essential element of the offense that must be proved beyond a reasonable doubt.