Fine structure in ${}^{153}{Tm}$ αdecay

In an investigation of A=153 isotopes fine structure was observed in

{}^{153}{Tm}

α decay. Besides the previously known α transitions that feed the

{}^{149}{Ho}

h_{11 / 2}

(0.0 keV) and

s_{1 / 2}

(49.0 keV) isomers, two, very much weaker, α groups were found to populate the

d_{3 / 2}

(220.4 keV) and

d_{5 / 2}

(564.4 keV) states in

{}^{149}{Ho}

. Based on the

{}^{149}{Ho}

level scheme and on the

Q_{α}

values for the two main

{}^{153}{Tm}

α transitions, we determine that the

h_{11 / 2}

level in

{}^{153}{Tm}

is the ground state and that the

s_{1 / 2}

state lies 43±7 keV above it. Energy systematics for the

s_{1 / 2}

and

h_{11 / 2}

proton states in even-N odd-Z nuclei near N=82 are discussed.

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Fine structure inTm153αdecay