ADOPTED LEVELS for 154La
Author: N. Nica | Citation: Nucl. Data Sheets 200, 2 (2025) | Cutoff date: 22-Aug-2022
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=10690 keV SY | S(n)= 3540 keV SY | S(p)= 12350 keV SY | Q(α)= -5790 keV SY | ||
| Reference: 2021WA16 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0.0 | (2-) | 161 ms 15 % β- = 100 % β-n = ? |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (2-) | 161 ms 15 % β- = 100 % β-n = ? | 2018Fu08: 2080 154La counts; 2018Sh11 141 154La counts. |
2017Wu04 compiled for XUNDL database by F. Kondev, ANL
2020Wu04 compiled for XUNDL database by B. Singh, McMaster
2017Wu04: The 154La nuclide was produced at the RIBF-RIKEN facility using the 9Be(238U,F) reaction at E=345 MeV/nucleon. Two experiments, optimized for the transmission of 158Nd and 170Dy ions, were carried out with average beam intensities of 7 pnA and 12 pnA, respectively. The identification of the nuclide of interest was made in the BigRIPS separator by determining the atomic number and the mass-to-charge ratio of the ion using the tof-Bρ-ΔE method. The reaction products were transported through the ZeroDegree Spectrometer and implanted into the beta-counting system WAS3ABi that was surrounded by the EURICA array comprising of 84 HPGe detectors. The typical implantation rate was ~100 ions/s. Measured: implanted ion-β--t, implanted ion-β--γ-t and implanted ions-γ-t correlations. Deduced: T1/2.
2020Wu04: 154La nuclide produced at the RIBF-RIKEN facility by 9Be(238U,F) reaction at E=345 MeV/nucleon and an intensity of 5 pnA. Identification of fission fragments of interest was made based on time-of-flight (tof), magnetic rigidity (Bρ), and energy loss (ΔE) using the BigRIPS spectrometer, determining atomic Z and mass-to-charge ratio α/Q, where Q=charge state of the ions. The separated nuclei were implanted at a rate of 100 ions/s in the β counting system of the Wide range Active Silicon-Strip Stopper Array for Beta and ion detection (WAS3ABi), which included a stack of five Double Sided Silicon Strip Detectors (DSSSDs). The WAS3ABi setup was surrounded by Euroball Riken Cluster Array (EURICA) array of 84 HPGe detectors for γ detection. Half-life of the separated and implanted ions was determined by fitting the time distribution of β(implants)- and/or βγ(implants)-correlated decay curves to the sum of activities of parent nuclei, daughter nuclei, grand-daughter nuclei, β-delayed neutron daughter and grand-daughter nuclei, and a constant background. Comparison of measured half-lives with FRDM+QRPA (2003), FRDM+QRPA (2019), KTUY+GT2, RHB+pn-RQRPA, and DF+CQRPA theoretical calculations.
Others: 2018Fu08, 2018Sh11
Q-value: ΔQ(β-)=360, ΔS(n)=420, ΔS(p)=500, ΔQ(α)=500 (syst,2021Wa16)
Q-value: S(2n)=8380 420, S(2p)=26980 580, Q(β-n)=5310 360 (syst,2021Wa16)