ADOPTED LEVELS for 229Rn
Authors: F.G. Kondev, J.K. Tuli and E. Browne | Citation: Nucl. Data Sheets 208, 397 (2026) | Cutoff date: 23-Oct-2025
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=3694 keV 14 | S(n)= 3952 keV 22 | S(p)= 9810 keV SY | Q(α)= 2360 keV SY | ||
| Reference: 2021WA16 |
| E(level) (keV) | T1/2(level) |
| 0.0 | 12.0 s +12-13 % β- = 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
2009Ne03: 229Rn was produced in a spallation U(p,X) reaction using UCx target and 1.4 GeV pulsed proton beam from the CERN’s proton Synchrotron Booster accelerator. The measurements were performed at the double Penning-trap mass spectrometer ISOLTRAP at ISOLDE-CERN facility. The reaction products diffused from the target into a high-efficiency ion source. They were accelerated to 30 keV and separated by a high-resolution mass separator. Penning trap mass measurements were carried out. Off-line studies were also completed to measure β decay events and the 229Rn half life.
Other: 2010Al24
Q-value: ΔS(p)=400, ΔQ(α)=300 (syst,2021Wa16)
Q-value: S(2n)=9666 19, S(2p)=17500 400 (syst) (2021Wa16)