Abstract
The spin assignments to the 1899 (4 +), 2308 (3 + or 4 +) and 2446 (3 +) keV levels in 138Ba have been confirmed by γ-γ directional correlation measurements. In addition, the multipolarity and E2 M1 mixing parameters for a number of transitions have been established as follows: 409 keV (M1+E2, −0.75 < δ < −0.45 or −0.85 < δ < −0.05 depending on the choice of J π = 3 + or 4 + for the initial state), 463 keV (E2, 0 < δ < 0.15 for M3 E2 admixture), 547 keV (M1+E2, −0.06 < δ < −0.015), 872 keV (M1+E2, δ undefined) and 1010 keV (M1+E2, −0.015 < δ < +0.020).
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