Authors: Balraj Singh and Jun Chen |  Citation: Nucl. Data Sheets 116, 1 (2014) |  Cutoff date: 31-Dec-2013 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=13060 keV SYS(n)= 3850 keV SYS(p)= 14940 keV SYQ(α)= -10700 keV SY
Reference: 2012WA38

General Comments:

1997Be70: identification in Pb(238U,F) E=750 MeV/nucleon; time-of-flight.

2010Wi03: 85Ga from 238U(p,F),E=54 MeV; products were accelerated to 225 MeV in the ORNL Tandem. Measured Eγ, Iγ, γγ, (fragment)γ coin (ion-tagged γ-ray spectra), βγ(ion) coin, βnγ coin using an array composed of four Ge clover and two plastic scintillator detectors. Comparison with spherical HFB calculations. See also 2009Gr06 and 2008WiZS (conference articles) from the same group

2012Ma37: 85Ga produced in fission of U with 50 MeV proton beam. Target=6 g/cm2 thick UCx located at target ion source assembly mounted on the Injector for Radioactive Ion Species 2 (IRIS-2) at HRIBF facility at ORNL. Fission products were separated by electromagnetic system. Separated ions were transmitted to Low energy Radioactive Ion beam Spectroscopy Station (LeRIBSS). Ions at 200 keV energy were deposited on a tape in the Moving Tape Collector located in the middle of β-γ counting system consisting of four Ge Clovers and two plastic scintillators. Measured β-gated γ spectra and half-lives. Half-life of isotope was measured by fitting the growth and decay curves of γ rays assigned to β-γ or βγ-neutron channels after subtraction of background. Comparison with theoretical calculations using density functional model.

2013Mi19: proton beam was provided by the Oak Ridge Isochronous Cyclotron (ORIC) at the HRIBF-ORNL facility. Target=UCx. Mass analyzed ions of 85Ga were extracted using Resonant Ionization Laser Ion Source (RILIS). Pure 85Ga beam was then sent to the Low-energy Radioactive Ion Beam Spectroscopy Station (LeRIBSS) and implanted in a moving tape collector (MTC). Measured Eγ, Iγ, Eβ, βγ-coin, nγ-coin, half-life of 85Ga, using two HPGe Clover detectors, two plastic scintillation counters for β, and an array of 48 3He ionization chambers for neutron detection. Gamma ray assigned to β-n decay of 85Ga to 84Ge: 624.3 keV. α γ ray at 107.8 keV is assigned to decay of 85Ga (2012Ma37)

Q-value: Q(β-) and S(n) from 2012Wa38; S(p) and Q(α) from 1997Mo25

Q-value: Estimated uncertainties (2012Wa38): ΔQ(β-)=300, ΔS(n)=500, ΔS(p)=670, ΔQ(α)=850

Q-value: S(2n)=6950 300, Q(β-n)=10010 300 (syst,2012Wa38). S(2p)=33830 (theory,1997Mo25)

Jπ(level) T1/2(level)
  0 (5/2-) 92 ms 4 
% β- = 100
% β-n > 35

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Additional Level Data and Comments:

  0(5/2-) 92 ms 4 
% β- = 100
% β-n > 35
Delayed-neutron is expected to be the dominant decay mode as suggested by the observation of a strong 624γ in 84Ge, and from theoretical values of %β-n=94, %β-2n=6 (1997Mo25); total delayed-neutron decay=100% (2005Bo19).

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