Authors: K. Auranen and E.A. Mccutchan |  Citation: Nucl. Data Sheets 168, 117 (2020) |  Cutoff date: 1-Aug-2020 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-4830 keV 50S(n)= 8000 keV 70S(p)= 8.4×102 keV 5Q(α)= 7520 keV 50
Reference: 2017WA10

  A  216Pa α decay 

General Comments:

Assignment: 197Au(20Ne,5n), 203Tl(16O,7N) excit (1968Va04)

2014Ya19: the nuclei of interest were produced in a 40Ca(193 MeV) + 175Lu complete fusion reaction at the HIRFL-Lanzhou facility. The target was a 500-μg/cm2-thick layer of natural Lu (>97.4% 175Lu) evaporated on a 40 μg/cm2 carbon backing. The residues were selected using gas-filled recoil separator SHANS, and implanted into position sensitive silicon detectors. Time and position correlation were measured between evaporation residue implantation (Er) and the subsequent α-decay events. Eα, half-lives, Er-α-α correlations were measured.

2015Ma63: the 212Ac nuclei were produced using a fusion-evaporation reaction of 162Dy(54Cr,p3n)212Ac. The 403-μg/cm2-thick target was on 75-μg/cm2-thick carbon backing and the 54Cr beam energy, accelerated by the K500 superconducting cyclotron of Texas A&M, was reduced stepwise with aluminium degraders (E(54Cr)=243, 248, 253 MeV). The residues were selected with the momentum achromat recoil spectrometer (MARS) and implanted into a position sensitive silicon detector. Eα and σ(p2n)+σ(p3n) were measured.

2017Gr18, 2016Fe11: the 212Ac nuclei were produced using a fusion-evaporation reaction of 197Au(20Ne,5n)212Ac at the Cyclotron Research Centre, Louvain-la-Neuve, Belgium. The 1-μm-thick target was placed on an angle of 20|’ with respect to the 145 MeV 20Ne beam axis. Residues were extracted using Leuven Isotope Separator On-Line (LISOL). g factor, quadrupole moment, and spin of the ground state were measured through optical hyperfine spectra obtained using in-gas-cell laser ionization and spectroscopy (IGLIS) technique.

2018Ro14: mass measurement. Mass excess of 7304 keV 24 compared compared with 7277 keV 51 from AME-2016 (2017Wa10).

Q-value: S(2n)=17660 80; S(2p)=3970 50; Q(εp)=4130 50 (2017Wa10).

XREFJπ(level) T1/2(level)E(γ)
    0.0A (7+) 880 ms 35 
% α = 95 CA
% ε = 5 CA
  133.6 3 A     133.6 3 
  158 20 A    

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Additional Level Data and Comments:

    0.0(7+) 880 ms 35 
% α = 95 CA
% ε = 5 CA
μ=4.98 28 (2017Gr18)
Configuration [(πh9/2)(νf5/2)]J=7 from g=0.711 39 (2017Gr18).

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Additional Gamma Comments:

  133.6  133.6E(γ): from 216Pa α decay (2000He17)

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