Low-Lying Negative-Parity States in ${Ne}^{21}$

Angular-distribution measurements have been performed on the

{Ne}^{22} (p, d) {Ne}^{21}

and

{Ne}^{20} (d, p) {Ne}^{21}

reactions at

E_{p} = 20

MeV and

E_{d} = 16.4

MeV, respectively. In the

{Ne}^{22} (p, d) {Ne}^{21}

reaction studies, formation of the 0-, 350-, and 3664-keV

{Ne}^{21}

levels was characterized by respective

l_{n} = 2, 2, and 1

neutron pickup transfers. The composite (

p, d

) angular distribution observed for the experimentally unresolved 2790- and 2796-keV states is shown to require a dominant

l_{n} = 1

component in the associated distorted-wave Born-approximation fit, with evidence for a minor

l_{n} = 0

component also being present. Since the 2796-keV level possesses

J^{π} = {\frac{1}{2}}^{+}

, the present (

p, d

) result implies

J^{π} = {\frac{1}{2}}^{-} or {\frac{3}{2}}^{-}

for the 2790-keV

{Ne}^{21}

level. The

{\frac{3}{2}}^{-}

, 4730-keV state did not display discernible direct-reaction characteristics in this (

p, d

) study. This was also true of the remaining

{Ne}^{21}

levels below

E_{x} = 5

MeV, which generally possessed ∼0.1-mb/sr cross sections attributed to second-order direct and/or compound nuclear-reaction mechanisms. The

{Ne}^{20} (d, p) {Ne}^{21}

results indicate

l_{n} = 0

transfer for the 2790-, 2796-keV

{Ne}^{21}

composite, and

l_{n} = 1

transfer for the 4730-keV

{Ne}^{21}

state. The 3664-keV level did not display discernible direct reaction characteristics in this (

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Low-Lying Negative-Parity States inNe21