It is one of most important issues of the high − spin 皿 uclear structure physics to un − derstan ( l the populatio 皿 and decay mechanisms of the superdef ( )rmed rotational bands, An important fact or in the problem is that the 伽 ite temperature effects play decisive roles since the phenome 夏 a take place at rather high excitation e 皿 ergy above the yrast line . Culre皿t understandi 皿 gs a 皿 d future problems were reviewd mainly for the problem of decay。 A 皿 attempt to the problem of popula 重

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... , whih is more dif 丑cult than that of deca ア, wele also briefly mentio 皿 ed .