Structure of ${}^{141}{Pm}$ from decay of $N = 79$ ${}^{141}{Sm}$

The 10.2 min

{}^{141}{Sm}^{g}

decay has been investigated. Positron,

γ

-ray singles,

γ - γ

, and

β^{+} - γ

coincidence as well as conversion electron measurements led to a decay scheme comprising 27 transitions among 12 excited states with deduced

J^{π}

assignments in

{}^{141}{Pm}

. The

J^{π} = \frac{1}{2^{+}}

for

{}^{141}{Sm}^{g}

is confirmed. Internal conversion electrons resulting from the decay of 22.6 min

{}^{141}{Sm}^{m}

have also been measured. The half-life of the

\frac{11}{2^{-}}

state at 628.6 keV in

{}^{141}{Pm}

populated in the latter decay has been measured to be 0.59 ± 0.02 μs. The

β^{+}

end-point energy measurements yielded decay energy

Q_{EC} = 4.70 \pm 0.06 MeV and 4.56 \pm 0.04 MeV

for

{}^{141}{Sm}^{m}

and

{}^{141}{Sm}^{g}

, respectively, and these values are compared with predictions of mass formulas. Systematics of the low-lying states and the

B (M 2)

and

B (E 3)

reduced transition rates in the odd-

A

N = 80

isotones are discussed.

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Structure ofPm141from decay ofN=79Sm141