Elsevier

Nuclear Physics A

Volume 419, Issue 1, 30 April 1984, Pages 163-186
Nuclear Physics A

In-beam α-, e- and γ-spectroscopy of 215Fr

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Abstract

The nucleus 215Fr was studied using the 208Pb(11B,4n) and 204Hg(15N, 4n) reactions. The measurements included αγ, γγ, and ee coincidence experiments as well as γ-ray and α-particle DPAD studies. The decay scheme gives levels up to a 3068 keV 392 isomer with t12 = 33 ± 5 ns as well as 3 shorter-lived isomers (t12 ≈ 4 ns); g-factors have been measured for these isomers. The α-particle spectroscopy showed the existence of 4 long-range alphas which could be assigned to excited states in 215Fr. t12(215Frg,s) = 86 ± 5 ns has been remeasured. The negative-parity states up to 1680 keV seem to be members of the π(h92)925v(g92)2 configuration; a strong hindranc M1 transitions is found. The higher-lying states are compared with the DIPM model.

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    Present address: Lawrence Livermore National Laboratory, Nuclear Chemistry Div., Livermore, Ca., USA.

    ††

    On leave from Institute of Nuclear Physics, Kraków, Poland.

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