ADOPTED LEVELS, GAMMAS for 164Sm
Authors: Balraj Singh and Jun Chen | Citation: Nucl. Data Sheets 147, 1 (2018) | Cutoff date: 30-Nov-2017
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=5280 keV SY | S(n)= 5450 keV SY | S(p)= 12140 keV SY | Q(α)= -3390 keV SY | ||
| Reference: 2017Wa10 |
| References: | |||
| A | 164Sm IT decay (0.60 μs) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | A | 0+ | 1.43 s 24 % β- = 100 % β-n = ? | |||||
| 69 1 | A | (2+) | 69 1 S | 100 | [E2] | 0.0 | 0+ | |
| 224.9 11 | A | (4+) | 155.9 4 | 100 | (E2) | 69 | (2+) | |
| 467.2 11 | A | (6+) | 242.2 3 | 100 | (E2) | 224.9 | (4+) | |
| 1136.1 11 | A | (5+) | 668.8 4 911.3 3 | 49 18 100 28 | 467.2 224.9 | (6+) (4+) | ||
| 1485.5 12 | A | (6-) | 0.60 µs 14 % IT = 100 | 349.4 2 | 100 | (E1) | 1136.1 | (5+) |
E(level): From least-squares fit to Eγ data
Jπ(level): As proposed by 2014Pa55 based on systematics of even-even nuclides for low-lying levels and potential-energy surface calculations for higher levels above 1 MeV, supported by multipolarities obtained from intensity balances.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - Kπ=0+, g.s. band. | |||||||
| 0.0 | 0+ | 1.43 s 24 % β- = 100 % β-n = ? | |||||
| 69 1 | (2+) | 69 1 S | 100 | [E2] | 0.0 | 0+ | |
| 224.9 11 | (4+) | 155.9 4 | 100 | (E2) | 69 | (2+) | |
| 467.2 11 | (6+) | 242.2 3 | 100 | (E2) | 224.9 | (4+) | |
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 69 | (2+) | 69 1 | [E2] | 9.4 | α=9.4 6 | |
| 224.9 | (4+) | 155.9 4 | (E2) | 0.332 | α=0.332 6, α(K)=0.264 5, α(L)=0.0551 10, α(M)=0.01108 20, α(N)=0.00199 4 | |
| 467.2 | (6+) | 242.2 3 | (E2) | 0.0723 | α=0.0723, α(K)=0.0600 9, α(L)=0.00995 15, α(M)=0.00198 3, α(N)=0.000362 6 | |
| 1485.5 | (6-) | 0.60 µs 14 % IT = 100 | 349.4 2 | (E1) | 0.00576 | B(E1)(W.u.)=8.8E-9 21, α=0.00576, α(K)=0.0051 7, α(L)=0.000606 9, α(M)=0.0001179 17, α(N)=2.21E-5 4 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0+ | 1.43 s 24 % β- = 100 % β-n = ? | Production σ(at 1 GeV/nucleon)=42 nb 4 (2012Ku26). E(level): Kπ=0+, g.s. band. |
| 69 | (2+) | E(level): Kπ=0+, g.s. band. | |
| 224.9 | (4+) | E(level): Kπ=0+, g.s. band. | |
| 467.2 | (6+) | E(level): Kπ=0+, g.s. band. | |
| 1485.5 | (6-) | 0.60 µs 14 % IT = 100 | Configuration: Kπ=6-, ν5/2[512]~#ν7/2[633]. Calculations suggest β2=0.295, β4=0.029, β6=-0.020 (2014Pa55). |
| E(level) | E(gamma) | Comments |
2012Ku26: 164Sm produced and identified in 9Be(238U,F), E=1 GeV/nucleon reaction using SIS-18 synchrotron facility at GSI. Target=1.6 g/cm2 9Be placed at the entrance of projectile Fragment Separator (FRS). Particle identification was achieved by event-by-event in-flight analysis of time-of-flight, energy loss measurement, and magnetic rigidity (tof-ΔE-Bρ). Time-of-flight measured using two plastic scintillation detectors, energy loss or deposit by ionization chambers (MUSIC), and magnetic rigidity by four time-projection chambers (TPC), which also provided energy deposit information. Isomer tagging method for known μs isomers was used to verify event-by-event identification and in-flight separation of new isotopes. Gamma rays from the known isomers were recorded in coincidence with the incoming ions using either the RISING array of Ge detectors at GSI or only two Ge detectors, a stopper foil and a scintillator for veto signal. Measured production cross section. Comparison of measured σ with predictions from ABRABLA model and EPAX-3 model
2017Wu04: 164Sm 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 ions)β--t, (implanted ions)(β-)γ-t, (implanted ions)γ-t correlations, and half-life of 164Sm decay
For theoretical nuclear structure calculations, consult NSR database, for about 15 references. These are listed in the ENSDF dataset as document records
Q-value: Estimated uncertainties (2017Wa10): ΔQ(β-)=320, ΔS(n)=420, ΔS(p)=500, ΔS(α)=420
Q-value: S(2n)=9720 360, S(2p)=23130 500, Q(β-n)=310 310 (syst,2017Wa10).