Study of Unbound Levels inN14by theC12(He3, pγ)N14Reaction

The 8.49-, 8.96-, and 9.17-MeV unbound levels of

N^{14}

have been studied by particle-

γ

angular-correlation measurements for the

C^{12} ({He}^{3}, p γ) N^{14}

reaction at 8.92 MeV bombarding energy. These levels were found to

γ

decay in competition with proton decay with the width ratios

\frac{Γ_{p}}{Γ_{γ}} = 3.7 \pm 1.1, 4.09 \pm 0.49, and 10 \pm 3

, respectively. The spin and parity of the

N^{14}

8.96-MeV level have been definitively established as

J^{π} = 5^{+}

. The

γ

widths of the

E 2

transitions from the 8.96- and 8.49-MeV levels have been compared with shell-model predictions. In addition, an unusual result was obtained for the

N^{14}

7.03-MeV level. While at

E_{{He}^{3}} = 5.11

MeV, the

m = 0

substate of this level was predominantly populated, it was found that at

E_{{He}^{3}} = 8.92

MeV the

| m | = 1

substates were strongly populated. The latter has been interpreted as due to

s = 1

transfer in a possible heavy-particle stripping reaction.

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