ADOPTED LEVELS for 189Hf
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 SY | S(n)= 4360 keV SY | S(p)= 10660 keV SY | Q(α)= -1090 keV SY | ||
| Reference: 2017WA10 |
| E(level) (keV) | T1/2(level) |
| 0 | % β- = 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | % β- = 100 | Production σ=3.8 nb 8 (2014Ku02) in 9Be(208Pb,X), E=1 GeV/nucleon reaction. |
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)