Properties of high-spin states in ${}^{91}{Nb}$ and ${}^{91}{Zr}$ via ${}^{6}{Li}$ -induced reactions

The properties of high-spin states in

{}^{91}{Nb}

and

{}^{91}{Zr}

have been studied with the

{}^{88}{Sr} ({}^{6}{Li}, 3 n) {}^{91}{Nb}

and

{}^{88}{Sr} ({}^{6}{Li}, p 2 n) {}^{91}{Zr}

reactions. In-beam measurements with Ge(Li) and Si(Li) detectors of

γ

-ray excitation functions,

γ - γ

coincidences,

γ

-ray angular distributions, and pulsed beam-

γ

timing spectra were made to establish decay schemes, level energies, spin-parity assignments,

γ

-ray multipolarities, and isomeric lifetimes. All of the high-spin states involving the

π 1 g_{\frac{9}{2}}

π 2 p_{\frac{1}{2}}

, and

ν 2 d_{\frac{5}{2}}

orbitals as well as other more complicated states were identified. In particular, the theoretically predicted isomeric states in

{}^{91}{Nb}

and

{}^{91}{Zr}

were found: the

| {(1 g_{\frac{9}{2}})}^{2} 2 p_{\frac{1}{2}}, {\frac{17}{2}}^{-} 〉

state in

{}^{91}{Nb}

is at 2035 keV with a

τ = 5.42 \pm 0.18

μsec, and the

| {(1 g_{\frac{9}{2}})}^{2} 2 d_{\frac{5}{2}}, {\frac{21}{2}}^{+} 〉

state in

{}^{91}{Zr}

is at 3167 keV with a

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Properties of high-spin states inNb91andZr91viaLi6-induced reactions