ADOPTED LEVELS for 165Eu
Authors: Balraj Singh and Jun Chen | Citation: Nucl. Data Sheets 194, 460 (2024) | Cutoff date: 31-Oct-2022
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=5797 keV 5 | S(n)= 5568 keV 6 | S(p)= 10093 keV 7 | Q(α)= -3067 keV 10 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 9Be(238U,Fγ) | ||
| E(level) (keV) | XREF | T1/2(level) |
| 0 | 2.24 s 14 % β- = 100 % β-n ≤ 0.4 | |
| 0+X | A |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 2.24 s 14 % β- = 100 % β-n ≤ 0.4 | %β-n deduced from neutron-gated β--decay events, fitted by an exponential function of the background subtracted time distribution of (implants)(β-)(neutron)-correlations (2022Ki23). For further details of the analysis method, consult 2020ToZY. | |
| 0+X | 124.2γ, 156γ and 244γ were found to follow a decay of a μs isomer, but no γ ray was assigned to a decay scheme. E(level): 124.2γ, 156γ and 244γ were found to follow a decay of a μs isomer, but no γ ray was assigned to a decay scheme. |
2008Os02 (also 2006SaZS,2006SaZZ): 165Eu was identified in U(p,X) at E(p)=36 MeV on target of natural uranium in the form of uranium carbide. The fission fragments were mass separated as metallic ions and implanted on to a tape transport system using surface ionization type ion source. Measured β, βγ-coin, γγ-coin. The 165Eu isotope identified by observing K-x rays of Gd, and its half-life was measured from Gd Kα x-ray decay curves.
2014Ha38, 2010Ha38, 2007Ha57 (also 2006HaZT): source was prepared by 238U(p,F) at E(p)=32 MeV at JAEA facility. Fission products were ionized and separated online using Tokai-ISOL mass separator. Measured Q(β-) using total absorption gamma-ray spectrometer of BGO detector.
2017Wu04: 165Eu was produced in 9Be(238U,F), E(238U)=345 MeV/nucleon reaction, followed by separation of fragments based on Bρ-ΔE-tof method using the BigRIPS separator at RIBF-RIKEN facility, optimized for the transmission of 158Nd and 170Dy ions. The reaction products were transported through the ZeroDegree spectrometer and implanted into the decay counting system WAS3ABi, surrounded by the EURICA array of 84 HPGe detectors for γ detection. Typical implantation rate was ≈100 ions/s. Measured time distribution of (implanted ion)β-, (implanted ion)β-γ and (implanted ions)γ correlated events, and half-life of decay of 165Sm g.s.
2017Pa25: possible μs isomer from observation of 124.2γ, 156γ and 244γ, following the decay of this isomer.
2022Ki23: 165Eu nuclide was produced at the RIBF-RIKEN facility using the 9Be(238U,F),E(238U)=345 MeV/nucleon, followed by separation of fission fragments by measuring the energy loss (ΔE), magnetic rigidity (Bρ) and time-of-flight (tof) of the ions using the BigRIPS separator, multisampling ionization chambers (MUSIC), and parallel-plate avalanche counters (PPACs), and plastic scintillators. The radioactive ions were implanted in the Advanced Implantation Detector Array (AIDA) consisting of a stack of six double-sided silicon strip detectors (DSSSDs), and centered in the BRIKEN neutron detector consisting of 140 3He-filled proportional counters embedded in a large polyethylene moderator matrix. For γ and nγ-coin detection, two CLARION-type clover HPGe detectors were used, but γ data were not analyzed in the present experiment. Measured (implanted ions)(β-) correlations, and (implanted ions)(β-)(neutron) correlations. Deduced half-life and %β-n for the decay of 165Eu.
Mass measurements: 2020Vi04, 2022Or02
2009Co21: theory: calculated half-life of 165Eu decay using artificial neural network (ANN) statistical model.
Q-value: S(2n)=10298 5, S(2p)=22350 400 (syst), Q(β-n)=893 5 (2021Wa16).