Author: Jun Chen |  Citation: Nucl. Data Sheets 146, 1 (2017) |  Cutoff date: 30-Sep-2017 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=11.5×103 keV 11S(n)= 2.2×103 keV 11S(p)= 11720 keV SYQ(α)= -4990 keV SY
Reference: 2017WA10

General Comments:

First identification of 138Sb nuclide by 1994Be24 via 208Pb(U,f) (See 2013Ka01)

2015Le14: Source of 138Sb was produced by in-flight fission of 238U on a 9Be target at E=345 MeV/nucleon at the Radioactive Isotope Beam Factory (RIBF) at the RIKEN Nishina Center. Fragments were separated by the BigRIPS separator and identified through a zero-degree spectrometer (ZDS) based on the Bρ-ΔE-tof method. Separated and selected ions were implanted into a wide-range active-silicon-strip stopper array for β and ion detector (WAS3ABi), consisting of five layers of 1-mm-thick double-sided silicon-strip detectors (DSSSDs), surrounded by two 2-mm-thick plastic scintillators. γ rays were detected by the EUROBALL-RIKEN HPGe cluster array (EURICA). Measured βγ(t), β-decay feedings. Deduced ground state half-life, J, π. Comparisons with shell-model calculations. Energy systematics of Te isotopes.

2011Ar18: 138Sb ions was prepared by bombardment of UCx target with 1 GeV protons followed by selective ionization with the Resonance Ionization Laser Ion Source (RILIS) and high-resolution mass separator at ISOLDE-CERN facility. Measured delayed neutrons to deduce half-life and Pn (delayed neutron emission probability). Comparison with calculations for spherical and nonspherical shapes. The new data incorporated in nucleosynthesis calculations of the r process.

1998Do08,1994Be24: identified in 208Pb(238U,f), E=750 MeV/nucleon, using the FRS fragment mass separator.

Mass measurement: 2016Kn03

Theoretical nuclear structure calculations:

2011Iz02: calculated β-delayed fission, β-transition strength functions.

2008Ga15: calculated change in decay-rate for decays to bound states and continuum

2007Ot03: calculated proton single-particle level energies.

2017Ko24, 2007Ma09, 2005Ni02, 2003Bo06: calculated β-decay half-life.

Q-value: ΔS(p)=1140, ΔQ(α)=1110 (2017Wa10)

Q-value: S(2n)=5860 1060, S(2p)=28290 1140 (syst), Q(β-n)=7010 1060, Q(2β+)=17760 1060 (2017Wa10)

Jπ(level) T1/2(level)
  0 (3-) 348 ms 15 
% β- = ?
% β-n = 72 8
% β-2n = ?

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Additional Level Data and Comments:

  0(3-) 348 ms 15 
% β- = ?
% β-n = 72 8
% β-2n = ?
Theoretical %β-n=37.3, %β-2n=30.5 (2003Mo09).

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