Whenever any person is found guilty of a violation of section 28-303, the district court shall within seven days fix a date for hearing on determination of the sentence to be imposed. Such determination shall be made by: (1) The judge who presided at the trial or who accepted the plea of guilty;
(2) a panel of three judges including the judge who presided or accepted the plea, the two additional judges having been designated by the Chief Justice of the Supreme Court after receiving a request therefor from the presiding judge; or
(3) a panel of three district judges named by the Chief Justice of the Supreme Court when such Chief Justice has determined that the presiding judge is disabled or disqualified after receiving a suggestion of such disability or disqualification from the clerk of the court in which the finding of guilty was entered.
