ADOPTED LEVELS for 201Ra
Author: F.G. Kondev | Citation: Nucl. Data Sheets 187, 355 (2023) | Cutoff date: 20-Sep-2022
Full ENSDF file | Adopted Levels (PDF version)
| S(p)= 1490 keV 40 | Q(α)= 8002 keV 12 | ||||
| Reference: 2021WA16 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0 | 3/2- | 8 ms +40-4 % α ≈ 100 |
| 263 26 | 13/2+ | 1.6 ms +77-7 % α ≈ 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 3/2- | 8 ms +40-4 % α ≈ 100 | σ(201Ra)=4 pb +80-30 at 249 MeV (2014Ka23). |
| 263 | 13/2+ | 1.6 ms +77-7 % α ≈ 100 | Eα1=7905 keV 20, correlated with Eα2(197mRn)=7358 keV 14 (2005Uu02). |
2005Uu02: 201Ra produced using the 141Pr(63Cu,3n) reaction, E(63Cu)=278 and 288 MeV. Detectors: gas filled mass separator, position sensitive silicon detectors with a typical energy resolution (FWHM) of 30 keV; multi-wire proportional gas counters; Measured: Eα, α-α correlations, T1/2.
2014Ka23: 201Ra produced using the 147Sm(56Fe,2n) reactions, E(56Fe)=249 MeV. Target=370 μg/cm2 thick enriched to 96.4% in 147Sm, with 40 μg/cm2 thick carbon backing and covered with a 10 μg/cm2 layer of carbon, and mounted on a rotating wheel. Detectors: SHIP recoil separator, 16-strip position sensitive Si detectors (PSSD), six Si strip detectors to detect escaping α particles and one HPGe clover detector behind the PSDD. Measured: recoil-α-γ(t) and recoil-α-α(t). Deduced: Eα and T1/2