ADOPTED LEVELS, GAMMAS for 212Ac
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 50 | S(n)= 8000 keV 70 | S(p)= 8.4×102 keV 5 | Q(α)= 7520 keV 50 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 216Pa α decay | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) |
| 0.0 | A | (7+) | 880 ms 35 % α = 95 CA % ε = 5 CA | |
| 133.6 3 | A | 133.6 3 | ||
| 158 20 | A |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | 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). |
| E(level) | E(gamma) | Comments |
| 133.6 | 133.6 | E(γ): from 216Pa α decay (2000He17) |
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).