ADOPTED LEVELS, GAMMAS for 126Pd
Authors: H. Iimura, J. Katakura, S. Ohya | Citation: Nucl. Data Sheets 180, 1 (2022) | Cutoff date: 1-Oct-2021
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=8930 keV SY | S(n)= 5900 keV SY | S(p)= 17250 keV SY | Q(α)= -12440 keV SY | ||
| Reference: 2021Wa16 |
| References: | |||
| A | 126Pd IT decay (23.0 MS) | B | 9Be(133Sn,xγ) |
| C | 9Be(238U,Fγ) | D | 126Rh β- decay |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0 | ABCD | 0+ | 48.5 ms 7 % β- = 100 % β-n = 4.9 9 | |||||
| 693.3 5 | ABCD | (2+) | 693.3 | 100 | 0 | 0+ | ||
| 1481.0 7 | A CD | (4+) | 787.7 | 100 | 693.3 | (2+) | ||
| 2023.5 7 | A CD | (5-) | 0.33 µs 4 % IT = 100 | 542.4 1330.2 | 100 6 77 6 | [E1] [E3] | 1481.0 693.3 | (4+) (2+) |
| 2109.7 9 | A C | (7-) | 0.44 µs 3 % IT = 100 | 86.2 | 100 | [E2] | 2023.5 | (5-) |
| 2406.4 10 | A | (10+) | 23.0 ms 10 % IT = 28 8 % β- = 72 8 | 296.7 | 100 | [E3] | 2109.7 | (7-) |
E(level): From least-squares fit to Eγ data, assuming 0.5 keV uncertainty for each γ ray
Jπ(level): As proposed by 2013Wa24, based on systematics of even-even and neighboring nuclides
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 2023.5 | (5-) | 0.33 µs 4 % IT = 100 | 542.4 | [E1] | B(E1)(W.u.)=2.9E-9 5 | |
| (5-) | 0.33 µs 4 % IT = 100 | 1330.2 | [E3] | B(E3)(W.u.)=0.23 4 | ||
| 2109.7 | (7-) | 0.44 µs 3 % IT = 100 | 86.2 | [E2] | 2.37 | B(E2)(W.u.)=2.14 17, α=2.37 6 |
| 2406.4 | (10+) | 23.0 ms 10 % IT = 28 8 % β- = 72 8 | 296.7 | [E3] | 0.1197 | α=0.1197 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 0+ | 48.5 ms 7 % β- = 100 % β-n = 4.9 9 | Measured σ=0.7 nb (2008Oh06). |
2021Ha19: 126Pd produced in 9Be(238U,F) reaction with 238U beam of 345 MeV/nucleon from the cascade operation of the RIBF complex of accelerators at RIKEN. Identification of 126Pd made on the basis of magnetic rigidity, time-of-flight and energy loss using the BigRIPS separator and ZeroDegree spectrometer. The separated nuclei were sent to the Advanced Implantation Detector Array (AIDA) for the detection of implanted ions and subsequent β- and β--delayed neutrons using six double-sided silicon-strip detector (DSSDs) for particles, and BRIKEN neutron counter array of 140 3He proportional counters embedded in a high-density polyethylene (HDPE) matrix. Measured and analyzed (implanted ions)-β and (implanted ions)-β-n correlated events to deduce half-life of decay and delayed-neutron emission probability (%β-n or (P1n). Comparison of measured half-lives and Pn values with FRDM+QRPA, FRDM+QRPA+HF, RHB+pn:RQRPA and EDM calculations.
2008Oh06: 126Pd nuclide identified in 9Be(238U,X) reaction with a 238U86+ beam energy of 345 MeV/nucleon produced by the cascade operation of the RIBF accelerator complex of the linear accelerator RILAC and four cyclotrons RRC, fRC, IRC and SRC. Identification of 126Pd nuclei was made on the basis of magnetic rigidity, time-of-flight and energy loss of the fragments using BigRIPS fragment separator. Experiments performed at RIKEN facility. Based on α/Q spectrum and Z versus α/Q plot, three counts were assigned to the 126Pd isotope. (Q=charge state)
2015Lo04: 126Pd nuclide produced at RIBF-RIKEN facility in 9Be(238U,F) reaction at E=345 MeV/nucleon with an average intensity of 6×1010 ions/s. Identification of 126Pd was made by determining atomic Z and mass-to-charge ratio α/Q, where Q=charge state of the ions. The selectivity of ions was based on magnetic rigidity, time-of-flight and energy loss. The separated nuclei were implanted at a rate of 50 ions/s in a stack of eight double-sided silicon-strip detector (WAS3ABi), surrounded by EURICA array of 84 HPGe detectors. Correlations were recorded between the implanted ions and β rays. The half-life of 126Pd isotope was measured from the correlated ion-β decay curves and maximum likelihood analysis technique as described in 2014Xu07. Comparison of measured half-lives with FRDM+QRPA, KTUY+GT2 and DF3+CQRPA theoretical calculations
Structure calculations:
2014Wa21: calculated levels, J, π, B(E2)
2010No01: IBM model, calculated potential energy surface (PES)contours, low-spin positive-parity levels, B(E2) ratios
1996Kl08: IBM-II model, calculated low-spin positive-parity levels up to 2.5 MeV, B(E2) from first 2+ level
1985Sc07: IBM model, calculated mixed symmetry, odd spin states, F-spin factor and matrix elements for 1+ to 0+ and 3+ to 0+ transitions
The β-decay properties (theory):
2013Fa08: calculated Q value, T1/2, %β-n
Q-value: ΔQ(β-)=450, ΔS(n)=570, ΔS(p)=640, ΔQ(α)=640 (2021WA16)