Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 20-MAR-2016 

Authors: Zoltan Elekes and Janos Timar |  Citation: Nucl. Data Sheets 129, 191 (2015) |  Cutoff date: 28-Feb-2015 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=10030 keV SYS(n)= 5500 keV SYS(p)= 17630 keV CAQ(α)= -12880 keV SY
Reference: 2012WA38,1997MO25

  A  128Pd IT decay (5.8 μs) 

General Comments:

2010Oh02: 128Pd nuclide identified in Be(238U,F) and Pb(238U,F) reactions 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 128Pd 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, 13 counts were assigned to 128Pd isotope. (Q=charge state)

2015Lo04: 128Pd 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 128Pd 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 128Pd 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:

2015Wa07, 2014Wa21: calculated levels, J, π, B(E2), energies and B(E2) of the first 2+ state

2009Mi25: Calculated β-decay half-life, G-T strength functions

2009Ti04: Calculated energies of 2+ and 3- states, B(E2) and ISGMR

2008Se01: Calculated energy of first 2+ state, B(E2)

2007Cu03: Calculated β-decay half-life, Q value, %β-n, G-T strength functions, S(2n)

2005Pa71, 2003Bo06, 2003Br19, 2003Mo09, 1988KrZR: Calculated β-decay half-life

2002Ma44: Calculated β-decay half-life, G-T strength functions

2001Ma56, 1999Ma88: Calculated β-decay half-life, %β-n

Q-value: Estimated uncertainties (2012Wa38): ΔQ-=670, ΔS(n)=780, ΔQ(α)=840

Q-value: S(p) from 1997Mo25, others from 2012Wa38

Q-value: S(2n)=9000 780, Q(β-n)=5640 630 (both from syst, 2012Wa38). S(2p)=32980 (theory, 1997Mo25)

XREFJπ(level) T1/2(level)E(γ)
I(γ)M(γ)Final Levels
     0A 0+ 35 ms 3 
% β- = 100
% β-n = ?
  1311.4 5 A (2+)     1311.4

  1815.8 7 A (4+)      504.4

  2075.9 9 A (6+)      260.1
  2151.0 10 A (8+) 5.8 µs 8 
% IT = 100

E(level): From 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

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Additional Gamma Data:

Additional Data
  2075.9 (6+)      260.1[E2]0.0478α=0.0478, α(K)=0.0406 6, α(L)=0.00590 9, α(M)=0.001118 16, α(N)=0.000182 3
  2151.0 (8+) 5.8 µs 8 
% IT = 100
    75.1[E2]3.88B(E2)(W.u.)=0.22 4, α=3.88, α(K)=2.78 4, α(L)=0.897 13, α(M)=0.1745 25, α(N)=0.0269 4

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Additional Level Data and Comments:

     00+ 35 ms 3 
% β- = 100
% β-n = ?
Measured σ=12 pb (2010Oh02), systematic uncertainty≈40%. Probability of misidentification of 128Pd isotope<0.001% (2010Oh02).

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