Utah Code Ann. § 76-5-403
(1)
(2)
(3) A violation of Subsection (2) is a first degree felony, punishable by a term of imprisonment of:
(b) except as provided in Subsection (3)(c) or (4), 15 years and which may be for life, if the trier of fact finds that:
(4) If, when imposing a sentence under Subsection (3)(b), a court finds that a lesser term than the term described in Subsection (3)(b) is in the interests of justice and states the reasons for this finding on the record, the court may impose a term of imprisonment of not less than: