ADOPTED LEVELS for 71Fe
Authors: Balraj Singh and Jun Chen | Citation: Nucl. Data Sheets 188, 1 (2023) | Cutoff date: 17-Jan-2023
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=12440 keV SY | S(n)= 3110 keV SY | S(p)= 18770 keV SY | Q(α)= -15090 keV SY | ||
| Reference: 2021WA16 |
| E(level) (keV) | T1/2(level) |
| 0 | 35.7 ms 20 % β- = 100 % β-n = ? % β-2n = ? |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 35.7 ms 20 % β- = 100 % β-n = ? % β-2n = ? | The β- decay mode has been detected, and it is the only decay possible, thus 100% β- is assigned. E(level): The β- decay mode has been detected, and it is the only decay possible, thus 100% β- is assigned. |
1997Be70: 71Fe produced and identified in 9Be(238U,X) reaction at 750 MeV/nucleon followed by mass separation in a magnetic spectrometer, time-of-flight and energy loss measurements. Measured production cross section.
2002MaZN (thesis): 71Fe produced in fragmentation of 86Kr beam at 57.8 MeV/nucleon at GANIL facility, LISE 2000 fragment separator, time-of-flight method, EXOGAM array for γ-ray detection. Measured β, isotopic half-life
2011Da08 (also 2002MaZN thesis): 71Fe produced in the fragmentation of 57.8 MeV/nucleon 86Kr beam impinged on 50 mg/cm2 thick tantalum target using LISE-2000 spectrometer at GANIL facility. Detector system included a three-element Si-detector telescope containing a double-sided silicon-strip detector (DSSSD) backed by a Si(Li) detector and surrounded by four clover type EXOGAM Ge detectors. Products identified by mass, atomic number, charge, energy loss and time of flight. Measured half-life from (implants)β correlated events.
2013Ma87: 71Fe produced in 9Be(86Kr,X), E(86Kr)=140 MeV/nucleon reaction at the NSCL-MSU facility. Target: 440 mg/cm2 9Be. Neutron rich Fe isotopes were separated using A1900 fragment separator. Detected β and γ radiation by NSCL β counting system. Measured time-of-flight and energy loss for identification of isotope. SeGA array was used for γ counting. Measured half-life by time distribution of β particles detected correlation with implanted 71Fe ions. The βγ-coincidence events in correlation with 71Fe implants were also detected, but the statistics were very low. Comparison with FRDM+QRPA and Df3a++CQRPA theoretical calculations
2014XuZZ (thesis): 71Fe produced in 9Be(238U,F), E=345 MeV/nucleon, and separated using BigRIPS and ZeroDegree spectrometers at RIBF-RIKEN facility, followed by β and γ counting using EURICA array for γ rays. Measured half-life of decay of 71Fe by (71Fe implants)β-correlated events, and by β(215.5γ)-coin decay curve. According to Fig. 3.7 showing a plot of yields of different isotopes, a large number of events were assigned to 71Fe.
2015BeZR: 71Fe produced in 9Be(238U,F),E=345 MeV/nucleon, and separated using BigRIPS and ZeroDegree spectrometers at RIBF-RIKEN facility, followed by β and γ counting. α total of 26346 implants of 71Fe were recorded.
Theoretical calculations: 2010Af01: calculated impact of nuclear magnetism (NM) on binding energies, quadrupole deformation, total neutron current distributions, neutron and proton dependencies of additional binding energies, and energy splittings between signature of single-particle states using NL3 parametrization of relativistic mean field (RMF) Lagrangian.
Q-value: Estimated uncertainties (2021Wa16): 610 for Q(β-), 500 for S(n), 640 for S(p), 570 for Q(α)
Q-value: S(2n)=8870 450, S(2p)=36880 640, Q(β-n)=6520 400 (syst, 2021Wa16). Q(β-2n)=2318 410 (deduced by evaluators from mass values in 2021Wa16)