Authors: Yu. Khazov, I. Mitropolsky, A. Rodionov |  Citation: Nucl. Data Sheets 107, 2715 (2006) |  Cutoff date: 17-Jul-2022 

 Full ENSDF file | Adopted Levels (PDF version) 

S(n)= 1.40×104 keV SYS(p)= -947 keV 5Q(α)= 3.4×103 keV SY
Reference: 2021WA16

General Comments:

1998Da03: 96Ru(40Ca,1p4n), E=222 MeV, σ=90 nb; measured proton radioactivity, T1/2, first observation of 131Eu deduced Jπ, high value of ground-state deformation of 131Eu. Recoil mass-separator, analyzer with a position-sensitive counter and silicon detector having 48strips coupled to GAMMASPHERE

1999So17, 2000SeZX (also 2001Se05): 58Ni(78Kr,1p4n), E=402 MeV, σ≈70 nb; measured proton delayed spectra, pγ coin, T1/2. First observation of fine structure in proton spectra, reported two proton peaks and proton partial T1/2 for 131Eu g.s decay to g.s. and 2+states of 130Sm, branching ratio to 130Sm 2+ state; γ-ray spectra are correlated with proton decays. Similar setup to 1998Da03

2002So02: 131Eu; compiled, evaluated structure data, proton-decay data

Others: 1976Li30, 1995Ab38, 1995Mo29, 1997Mo25, 2001Go20, 2002Ry05, 2005Ba04, 2002Fe03, 2002Du16

131Eu ground-state deformation (from the analysis of the proton radioactivity data) β≈0.35 was deduced (1998Da03,1999So17,2000Bb02, 2000Da11,2000Ka19,2000Kr07,2000Ma18,2001Es01,2005Fe08)

Jπ(level) T1/2(level)
  0 3/2+ 17.8 ms 19 
% p = 89 9
% ε = 11 9

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Additional Level Data and Comments:

  03/2+ 17.8 ms 19 
% p = 89 9
% ε = 11 9
Proton decay to 130Sm (E=121 3, Jπ=2+): E(p)=811 7, B(p)=0.21 5, T1/2=84 ms 20 (1999S017).

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