ADOPTED LEVELS for 231Fr
Authors: Balraj Singh, Jagdish K. Tuli, and Edgardo Browne | Citation: Nucl. Data Sheets 185, 560 (2022) | Cutoff date: 31-Aug-2022
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=3864 keV 14 | S(n)= 5478 keV 10 | S(p)= 7380 keV SY | Q(α)= 2230 keV SY | ||
| Reference: 2021WA16 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0.0 | (1/2+) | 17.6 s 6 % β- = 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (1/2+) | 17.6 s 6 % β- = 100 | μ=+1.56 2 (2014Bu06) Isotope shift δν(231Fr,221Fr)=-22.14 GHz 10 (2014Bu06). |
1985Hi02: 231Fr produced and identified in 238U(p,X),E=600 MeV reaction. Measured γ- and x-ray spectra, T1/2.
2001Fr05: 231Fr was produced by spallation of 1 GeV proton beam on uranium targets. The activity was mass-separated at CERN ISOLDE on-line separator, deposited on a magnetic tape, and then radiations were counted at two stations.
2014Bu06: 231Fr produced in 1.4-GeV proton bombardment of UCx target using HRS mass separator, ISCOOL gas-filled segmented linear Paul trap, and RILIS at ISOLDE-CERN facility. Measured hyperfine spectra, magnetic dipole moments and rms charge radii by Collinear Resonance Ionization Spectroscopy (CRIS)
Measured atomic masses: 2014Kr09, 2012Ch19 (also 2008ChZI thesis)
Theoretical nuclear structure calculations: consult NSR database (www.nndc.bnl.gov/nsr/) for two primary references, also listed in ’document records’ in this dataset, which can be accessed through on-line ENSDF database at www.nndc.bnl.gov/ensdf/
Q-value: Estimated uncertainties (2021Wa16): 200 keV for S(p), 300 keV for Q(α)
Q-value: S(2n)=9730 9, S(2p)=17390 400 (syst) (2021Wa16)