In each case in which the jury imposes the death sentence, the determination of the jury shall be supported by specific written findings of fact based upon the circumstances in subsections (5) and (6) of this section and upon the records of the trial and the sentencing proceedings. If, after the trial of the penalty phase, the jury does not make the findings requiring the death sentence or life imprisonment without eligibility for parole, or is unable to reach a decision, the court shall impose a sentence of life imprisonment.