ADOPTED LEVELS for 194Re
Authors: Jun Chen and Balraj Singh | Citation: Nucl. Data Sheets 177, 1 (2021) | Cutoff date: 3-Sep-2021
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=5180 keV SY | S(n)= 5100 keV SY | S(p)= 8360 keV SY | Q(α)= -970 keV SY | ||
| Reference: 2021WA16 |
| References: | |||
| A | 9Be(208Pb,xγ) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0 | (0+,1) | 5 s 1 % β- = 100 | |
| 285 40 | (11-) | 25 s 8 % β- ≈ 100 | |
| 833 33 | 100 s 10 % β- ≈ 100 | ||
| X | A | 45 µs 18 % IT ≈ 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | (0+,1) | 5 s 1 % β- = 100 | Approximate number of nuclei implanted in the plastic stopper reported to be 101200 300 (2009St16,2008StZY). E(level): From mass measurements by 2012Re19. In 2012Al05 as well as in 2012Re19 it was not possible to associate the isomers with specific half-lives, meaning that these could be interchanged. T1/2(level): From 2012Al05 (also 2012Re19) for highly ionized or bare atom. It is not possible to associate the isomers with specific half-lives. |
| 285 | (11-) | 25 s 8 % β- ≈ 100 | E(level): From mass measurements by 2012Re19. In 2012Al05 as well as in 2012Re19 it was not possible to associate the isomers with specific half-lives, meaning that these could be interchanged. T1/2(level): From 2012Al05 (also 2012Re19) for highly ionized or bare atom. It is not possible to associate the isomers with specific half-lives. |
| 833 | 100 s 10 % β- ≈ 100 | This isomer possibly feeds the 6+ state in 194Os. Decay spectra for 218γ, 383γ, 530γ give T1/2=40 s 8, 46 s 8, 100 s 10, respectively. E(level): From mass measurements by 2012Re19. In 2012Al05 as well as in 2012Re19 it was not possible to associate the isomers with specific half-lives, meaning that these could be interchanged. T1/2(level): From 2012Al05 (also 2012Re19) for highly ionized or bare atom. It is not possible to associate the isomers with specific half-lives. |
Other measurements:
1999Be63: 194Re identified in fragmentation of 197Au beam in 9Be(197Au,X) reaction at 950 MeV/nucleon.
2009St16 (also 2008StZY thesis), 2009Ku28, 2009Al30, 2008St20: 194Re nuclide produced in the reaction 9Be(208Pb,X) with a beam energy of 1 GeV/nucleon produced by the SIS-18 accelerator at GSI facility. Fragments identified in flight by the Fragment Separator (FRS) based on time of flight, Bρ and energy loss.
2005Ca02, 2000PoZY: 9Be(208Pb,X) E=1 GeV/nucleon α possible isomer with half-life <75 μs assigned to 194Re, energy of the isomer is not known
2012Al05 (also 2012Be38): 194Re produced by fragmentation of E=1 GeV/nucleon 208Pb beam from SIS-18 synchrotron at GSI on a 9Be target of thickness ≈ 2 g/cm2. Reaction products were separated and identified by GSI Fragment Separator (FRS) set on 190Ta, 192Ta and 194Re. The recoils were stopped in RISING active stopper. Measured Eγ, Iγ, γγ coin, (recoil)γ, βγ and (recoil)β correlations, half-lives using RISING array of 15 seven-element Cluster Ge detectors for γ rays and DSSSD, MUSIC detectors for particle detection. Recoil-decay tagging technique also used. Deduced isomers and levels in 194Os. Comparison and interpretation with Nilsson model multi-quasiparticle calculations for two quasiparticle states in 194Re. 2012Al05 refer to a "to be published " study: GSI Storage Ring mass measurements reveal two long-lived isomers in 194Re with excitation energies less than 1 MeV and with half-lives in seconds region (reference #40)
2012Re19 (also 2012ReZZ thesis): Schottky mass spectrometry technique used to measure masses directly and identify high-spin isomers. E=478-492 MeV/nucleon from UNILAC-SIS facility at GSI. Target=9Be 1035 mg/cm2 with a 221 mg/cm2 niobium backing. Mostly bare atoms of the highly-charged reaction products were separated with FRS and injected into storage ring ESR. The ions were stochastically and electron cooled. Deduced masses from Schottky spectra; identified high-spin isomer. 194Re in 75+ charge state, i.e. bare ion
Q-value: Estimated uncertainties (2021Wa16): 200 for Q(β-) and S(n), 280 for S(p) and Q(α)
Q-value: S(2n)=11810 210, S(2p)=18740 450 (syst,2021Wa16)