ADOPTED LEVELS for 203Ra
Author: F.G. Kondev | Citation: Nucl. Data Sheets 177, 509, 2021 | Cutoff date: 4-Jul-2021
Full ENSDF file | Adopted Levels (PDF version)
| S(n)= 8445 keV 18 | S(p)= 1789 keV 11 | Q(α)= 7736 keV 6 | |||
| Reference: 2021WA16 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0 | 3/2- | 31 ms +17-9 % α ≈ 100 |
| 246 14 | 13/2+ | 24 ms +6-4 % α ≈ 100 |
T1/2(level): From Eα(t) in 2005Uu02.
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 3/2- | 31 ms +17-9 % α ≈ 100 | 2005Uu02: Eα1=7589 keV 8 correlated with Eα2=6989 keV 6, T1/2=1.1 s +9-4 (199Rn) and Eα3=6617 keV 6, T1/2=3.9 s +3.2-1.2 (195Po); 1996Le09: Eα1=7577 keV 20, correlated with Eα2=6969 keV 15, T1/2=1.5 s (199Rn) and Eα3=6614 keV 14, T1/2=2.2 s (195Po). E(level): 2005Uu02: Eα1=7589 keV 8 correlated with Eα2=6989 keV 6, T1/2=1.1 s +9-4 (199Rn) and Eα3=6617 keV 6, T1/2=3.9 s +3.2-1.2 (195Po); 1996Le09: Eα1=7577 keV 20, correlated with Eα2=6969 keV 15, T1/2=1.5 s (199Rn) and Eα3=6614 keV 14, T1/2=2.2 s (195Po). |
| 246 | 13/2+ | 24 ms +6-4 % α ≈ 100 | 2005Uu02: Eα1=7612 keV 8, correlated with Eα2=7060 keV 6, T1/2=260 ms +80-50 (199Rn) and Eα3=6700 keV 6, T1/2=2.8 s +10-6 (195Po). 1996Le09: Eα1=7615 keV 20, correlated with Eα2=7060 keV 15, T1/2=0.9 s +9-3 (199Rn) and Eα3=6712 keV 10, T1/2=1.0 s +9-3 (195Po). E(level): 2005Uu02: Eα1=7612 keV 8, correlated with Eα2=7060 keV 6, T1/2=260 ms +80-50 (199Rn) and Eα3=6700 keV 6, T1/2=2.8 s +10-6 (195Po). 1996Le09: Eα1=7615 keV 20, correlated with Eα2=7060 keV 15, T1/2=0.9 s +9-3 (199Rn) and Eα3=6712 keV 10, T1/2=1.0 s +9-3 (195Po). |
1996Le09: Isotope produced in 175Lu(35Cl,7N) reaction. E(35Cl)=191-208 MeV. Maximum yield was observed at E(35Cl)=199 MeV. Pulsed beam with a repetition rate of 25 hz and a duty factor of 25%. α typical beam intensity of (4-6)*1011 particles/s. Target: natural Lu with a thickness of 320 μg/cm2; Detectors: gas-filled recoil mass separator, position sensitive silicon detector. α typical energy resolution of 30-35 keV (FWHM). Measured: Eα, T1/2, Eα-Eα correlations.
2005Uu02: Isotope produced in 141Pr(65Cu,3n) and 170Yb(36Ar,3n) reactions. E(65Cu)=283-293 MeV and E(36Ar)=160-185 MeV. Typical beam intensities of 10-50 pnA (65Cu) and 30-60 pnA (36Ar). Targets: rolled praseodymium with thickness of about 1 mg/cm2 and enriched to 70% in 170Yb metallic target with thickness of about 0.5 mg/cm2; Detectors: gas-filled recoil mass separator, two multi-wire proportional counters, position sensitive silicon detector (300 um thick). α typical energy resolution of 30 keV (FWHM) at Eα=7000 keV. Measured: Eα, T1/2, Eα-Eα correlations.
2014Ka23: Isotope produced in 149Sm(56Fe,2n) reaction at GSI. E(56Fe)=244-275 MeV. Target=370 μg/cm2 thick, enriched to 96.9% in 149Sm, and backed with 40 μg/cm2 thick carbon layer and covered with a 10 μg/cm2 layer of carbon. Evaporation residues were separated using the SHIP (GSI) separator. Detectors: 16-strip position sensitive Si detectors (PSSD), six Si strip detectors to detect escaping α particles, and three time-of-flight detectors in front of PSSDs. Measured: Eα, T1/2, Eα-Eα correlations.