Band structure in neutron-deficientXe117,119,121nuclei

Collective features of odd-

N

{}^{117, 119, 121}{Xe}

have been investigated via

{}^{106, 110}{Cd} ({}^{14}N, p 2 n) {}^{117, 121}{Xe}

and

{}^{106}{Cd} ({}^{16}O, 2 p n) {}^{119}{Xe}

reactions. In-beam

γ

-ray excitation,

γ - γ

coincidence, and

γ - W (θ)

measurements were performed to establish decay schemes,

γ

-ray multipolarities, and

J^{π}

assignments. Strong

Δ J = 2

band structures, associated with the

1 h_{\frac{1}{2}}

quasi-neutron band, were observed on

{11 / 2}^{-}

states in the

{}^{117, 119, 121}{Xe}

nuclei. The unfavored

Δ J = 2

sidebands, which crossover in energy at the

N = 64

subshell (

{}^{119}{Xe}

core), were weakly observed down to the

{9 / 2}^{-}

member in all three nuclei. Systematics of these

1 h_{\frac{1}{2}}

band structures in odd-Xe nuclei are presented and discussed in terms of the current theoretical models. A second collective feature, a

Δ J = 1

band structure built on

1 g_{\frac{1}{2}}

quasi-neutron-hole states, was observed in the

{}^{119, 121}{Xe}

nuclei.

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