ADOPTED LEVELS for 202Ra

Authors: S. Zhu and F.G. Kondev |  Citation: Nucl. Data Sheets 109, 699 (2008) |  Cutoff date: 1-May-2007 

 Full ENSDF file | Adopted Levels (PDF version) 


S(n)= 1.082×104 keV SYS(p)= 1.80×103 keV 8Q(α)= 7897 keV 21
Reference: 2012WA38

General Comments:

2005Uu02: 202Ra was produced by 141Pr(63Cu,2n) with 1 mg/cm2 target and 278 to 288-MeV beam. Reaction products were separated by a gas-filled separator (RITU), and implanted into a position-sensitive silicon detector. One quadrupole (recoil-α12-α{-3) event 7740 keV (α1), 2285 keV (escaped α2) and 6843 keV (α3) was observed. The assignment of 202Ra decay is based on the spatial and time correlations with known α-decays of 198Rn and 194Po.

1996Le09: 202Ra was produced by 170Yb(36Ar,4n) with 360 μg/cm2 target (72% 170Yb, 18% 171Yb, 5% 172Yb and <3% 168Yb, 173Yb, 174Yb and 176Yb each) and 201-MeV beam. Reaction products were separated by a gas-filled separator (RITU), and implanted into a position-sensitive silicon detector. One quadrupole (recoil-α12-α{-3) (Eα2, Eα3 missing) event 7860 keV 601) was observed. The assignment to 202Ra decay is tentative.

Q-value: Note: Current evaluation has used the following Q record

Q-value: Q(α) is from Eα=7740 keV 20 (2005Uu02). Q(α)=8020 keV 60 in 2003Au03





E(level)
(keV)
Jπ(level) T1/2(level)
  0? 0+ 16 ms +30-7 
% α ≈ 100

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
  00+ 16 ms +30-7 
% α ≈ 100
Eα=7740 keV 20 from 2005Uu02. Other: 7860 keV 60 (1996Le09).

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