ADOPTED LEVELS, GAMMAS for 86Ge
Authors: A. Negret and B. Singh | Citation: Nucl. Data Sheets 203, 283 (2025) | Cutoff date: 20-Jan-2025
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=956×101 keV 44 | S(n)= 435×101 keV 44 | S(p)= 1694×101 keV 44 | Q(α)= -951×101 keV 44 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 86Ga β- decay (51 MS) | B | 87Ga β-n decay (27 MS) |
| C | 1H(87As,2pγ) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | Final Levels | |
| 0 | ABC | 0+ | 221.6 ms 11 % β- = 100 % β-n = 24.5 12 | ||||
| 527.30 44 | ABC | (2+) | 527.30 44 | 100 | 0 | 0+ | |
| 1024.3 10 ? | A | 1024.3 10 | 100 | 0 | 0+ | ||
| 1046 15 | C | (2+) | 510 19 1057 22 | | 527.30 0 | (2+) 0+ | |
| 1313.4 7 | BC | (4+) | 786.1 5 | 100 | 527.30 | (2+) | |
| 1430 17 ? | C | (3+) | 380 8 ? | 100 | 1046 | (2+) | |
| 1911 23 | C | (4+) | 865 18 | 100 | 1046 | (2+) | |
| 2500 30 | C | (6+) | 1180 26 | 100 | 1313.4 | (4+) | |
E(level): From least-squares fit to Eγ data
Jπ(level): As proposed in 2017Le08 based on systematics of even-even nuclei, as well as comparison with shell-model and symmetry-conserving configuration mixing (SCCM) calculations
E(γ): From 1H(87As,2pγ), unless mentioned otherwise.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | Final Levels | ||
| Band 1 - g.s. band | |||||||
| 0 | 0+ | 221.6 ms 11 % β- = 100 % β-n = 24.5 12 | |||||
| 527.30 44 | (2+) | 527.30 44 | 100 | 0 | 0+ | ||
| 1313.4 7 | (4+) | 786.1 5 | 100 | 527.30 | (2+) | ||
| 2500 30 | (6+) | 1180 26 | 100 | 1313.4 | (4+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | Final Levels | ||
| Band 2 - γ band | |||||||
| 1046 15 | (2+) | ||||||
| 1430 17 | (3+) | 380 8 ? | 100 | 1046 | (2+) | ||
| 1911 23 | (4+) | 865 18 | 100 | 1046 | (2+) | ||
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 0+ | 221.6 ms 11 % β- = 100 % β-n = 24.5 12 | E(level): g.s. band. |
| 527.30 | (2+) | E(level): g.s. band. | |
| 1046 | (2+) | E(level): γ band. | |
| 1313.4 | (4+) | E(level): g.s. band. | |
| 1430 | (3+) | E(level): γ band. | |
| 1911 | (4+) | E(level): γ band. | |
| 2500 | (6+) | E(level): g.s. band. |
| E(level) | E(gamma) | Comments |
| 527.30 | 527.30 | E(γ): From 86Ga β- decay (2023Yo04). Other: 534 8 (2017Le08) |
| 1024.3 | 1024.3 | E(γ): From 86Ga β- decay (2023Yo04). |
| 1313.4 | 786.1 | E(γ): From 87Ga β-n decay (2023Yo04). Other: 791 23 (2017Le08). |
1994Be24: 86Ge produced and identified in Pb(238U,F) reaction at E=750 MeV/nucleon at the SIS synchrotron, GSI. Identification using the Bρ-ΔE-tof method and FRS separator
2013Ma22: proton beam was provided by the Oak Ridge Isochronous Cyclotron (ORIC) at the HRIBF-ORNL facility. Target=238UCx. Fission fragments were ionized to charge state +1 then purified using H2S gas, a mass pre-separator and electromagnetic separation. The purified beams were then sent to the Low-energy Radioactive Ion Beam Spectroscopy Station (LeRIBSS) and implanted in a moving tape collector (MTC). Measured Eγ, Iγ, Eβ, βγ-coin, half-life of 86Ge g.s. using two plastic scintillation counters and four HPGe detectors. Comparison with the gross theory of β decay, the finite-range droplet model and the continuum quasiparticle random-phase approximation.
2014XuZZ (thesis): 86Ge 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 86Ge by (86Ge 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 86Ge.
Mass measurement: 2006Ha62
Theoretical structure calculations:
2022Su20: calculated potential energy surfaces in (β,γ) plane, isoscalar giant monopole, quadrupole, hexadecupole resonance structures, transition densities, single neutron levels, with evidence for monopole-quadrupole-hexadecupole coupling. Quasiparticle finite amplitude method (QFAM) based on the covariant density functional (CDFT) theory DD-ME2 and a separable pairing force.
2020Ab05: calculated potential energy surface (PES) in (β2,γ) plane, S(2n), neutron-, proton-, and charge-radii, β and γ deformations, shape coexistence using the relativistic Hartree-Bogoliubov formalism with density-dependent zero- and finite-range and DD-PC1 interactions.
2017No04: calculated mean-field potential energy surfaces in (β,γ) plane using the Gogny-D1M EDF, and the IBM, level energies and B(E2) of low-lying 0+, 2+ and 4+ states, fraction of intruder configuration in 0+ states, spectroscopic quadrupole moments of 2+ states, ρ2(E0) using Interacting boson model (IBM) with self-consistent mean-field calculation based on the Gogny-D1M energy density functional, with mean-field energy surface from constrained Hartree-Fock-Bogoliubov (HFB) method.
2013Si25: calculated levels, Jπ, yrast and excited bands, intrinsic and spectroscopic quadrupole moments, B(E2), deformation parameters β and γ, potential energy surface contours in (β,γ) plane using algebraic pseudo-SU(3) model, and shell model.
Other theory references: seven references for structure retrieved from the NSR database are listed under ’document records’ in this dataset.
Q-value: S(2n)=7390 440, S(2p)=32150 590 (syst), Q(β-n)=5720 440 (2021Wa16).