Authors: T.D. Johnson, Balraj Singh |  Citation: Nucl. Data Sheets 142, 1 (2017) |  Cutoff date: 15-Apr-2017 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=4670 keV SYS(n)= 4360 keV SYS(p)= 10660 keV SYQ(α)= -1090 keV SY
Reference: 2017WA10

General Comments:

2009Al30 (also 2012Al05): 189Hf identified in 9Be(208Pb,X) at 1 GeV/nucleon at GSI facility. Secondary fragmentation residues were separated and identified event-by-event using GSI Fragment Separator with a setting centered on 190Ta or 192Ta. Secondary ions were implanted into the RISING stopper with a series of double-sided silicon strip detectors (DSSSDs) to determine the position of the implanted ions correlated with β- decays. The RISING array of Ge detectors also provided β and γ correlated events following the decay of secondary fragments. Time-of-flight and energy loss techniques provided the identification of projectile fragments. In the two-dimensional particle identification plots, 189Hf is clearly identified in Fig. 3 of 2009Al30 (also a similar plot in 2012Al05), as mentioned also in 2012Gr19, but is not discussed.

2014Ku02: 189Hf formed in 9Be(208Pb,X), E=1 GeV/nucleon, measured production using FRS separator at GSI facility. Authors claim first experimental discovery of 189Hf, but in evaluators’ opinion, 2009Al30 already had evidence for its production.

Q-value: Estimated uncertainties (2017Wa10): 360 for Q(β-), 420 for S(n), 590 for S(p) and Q(α)

Q-value: S(2n)=10490 420 (syst,2017Wa10). S(2p)=20220 (1997Mo25,theory)

  0 % β- = 100

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Additional Level Data and Comments:

  0 % β- = 100
Production σ=3.8 nb 8 (2014Ku02) in 9Be(208Pb,X), E=1 GeV/nucleon reaction.

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