Mean life and collective effects of the 937 keV, $0^{+}$ state in ${}^{72}{Se}$ : Evidence for nuclear coexistence

The

0^{+}

′ state at 937 keV in

{}^{72}{Se}

is unusual in that it is only 75 keV above the first excited

2^{+}

state. The half-life

T_{\frac{1}{2}}

of the

0^{+}

′ state was determined to be 15.8±0.9 nsec by delayed coincidence techniques. The ratio of the

\frac{E 0}{E 2}

decays was measured to be 0.37±0.23 and the reduced monopole matrix element

ρ

was calculated to be

{0.176}_{- 0.070}^{+ 0.048}

. The

B (E 2)

value of the 75-keV transition was deduced to be 36±7 single-particle units. This large

B (E 2)

value indicates that the

0^{+}

′ state is collective. These data are interpreted in terms of a coexistence of spherical and deformed shapes.

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Mean life and collective effects of the 937 keV,0+state inSe72: Evidence for nuclear coexistence