Whenever a defendant is found guilty of a felony following a trial or the entry of a plea of guilty or tendering a plea of nolo contendere, the prosecuting attorney charged with the prosecution of such defendant or the Attorney General may appeal the sentence imposed if there is a reasonable belief, based on all of the facts and circumstances of the particular case, that the sentence is excessively lenient.
Neb. Rev. Stat. §§ 29-2320