171HF    171HF IT DECAY                1997CA39                  18NDS    201808
171HF  H TYP=FUL$AUT=CORAL M. BAGLIN, E.A. MCCUTCHAN$CIT=NDS 151, 334 (2018)$
171HF2 H CUT=30-Jun-2018$
171HF c  1997Ca39: produced isomer using {+170}Yb(|a,3n) at E|a=50 MeV; enriched
171HF2c  target in IGISOL gas chamber; mass-analyzed products deposited on
171HF3c  tape for |g monitoring with Ge(Li) detector or implanted in front
171HF4c  surface of a stack of two microchannel plates; measured decay of
171HF5c  microchannel-plate count rate.
171HF c  2000Ye02: produced isomer using the {+175}Lu(p,5n) reaction with
171HF2c  E(p)=55 MeV; on-line laser spectroscopy
171HF cL J,E       From Adopted Levels.
171HF  P 21.93      9  1/2(-)          29.5 S    9
171HF  N 1.0          1.0      1.0     LE
171HF PN                                                                     2
171HF  L 0.0          7/2(+)           12.1 H    4
171HF cL T         from Adopted Levels.
171HF  L 21.93      9  1/2(-)          29.5 S    9                           M
171HF2 L %IT LE 100$%EC+%B+=?
171HFM L MOMM1=+0.526 16 (2000Ye02)
171HF cL MOMM1$from collinear laser beam spectroscopy (2000Ye02)
171HF cL %IT,%EC+%B+$the microchannel plates (1997Ca39) are sensitive to
171HF2cL |g rays, low-energy electrons and x rays, so it is unclear whether this
171HF3cL isomer decays by IT or |e decay or both. However, the analogous
171HF4cL isomer in {+169}Yb exhibits %IT=100. Also, significant |e decay from
171HF5cL this 1/2[521] level to the 79 s, 1/2[541] isomer at 71.1 keV in
171HF6cL {+171}Lu should have been evident in the measured activity decay
171HF7cL curve, but was not. Consequently, it seems likely that %IT=100 for
171HFxcL this level.
171HF cL T         from decay of activity in microchannel plates (1997Ca39).
171HF  G  21.93     9           [E3]                   5.44E5 16 100           S
171HFS G L/T=0.704 16$M/T=0.234 9$N+/T=0.0623 25
171HFS G N/T=0.0559 23$O/T=0.0064 3$P/T=3.53E-6 14
171HF cG E         from level energy difference in Adopted Levels.
171HF cG M         if %IT(22 level) exceeds about 0.1%, RUL requires |DJ|<3
171HF2cG for this transition; even if it were |?100%, the reduced transition
171HF3cG probability would be unreasonably small if |DJ<3.