Authors: Balraj Singh and Jun Chen |  Citation: Nucl. Data Sheets 116, 1 (2014) |  Cutoff date: 31-Dec-2013 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=9224 keV 4S(n)= 5407 keV 4S(p)= 12330 keV 4Q(α)= -7986 keV 4
Reference: 2012WA38

  A  85Ge β- decay (503 MS)  B  86Ge β-n decay (226 MS)

General Comments:

85As identified in neutron-induced fission by chemical separation and milking daughter products 85,84Se (1967De01). Tentative identification was also mentioned in delayed neutron decay studies (1966To02), and in fission of 238U (Wanless and Thode: Can. Jour. Phys. 33, 54 (1955))

86Ge has been identified (1994Be24) but its decay properties are not known experimentally. From theoretical calculations of 1997Mo25 and 2005Bo19, total delayed-neutron decay to 85As is expected to be 7% (1997Mo25) and 70% (2005Bo19). Others: 2008Ha23, 2008Su19.

85Aa produced by 2008Ha23 through U(p,F) and U(d,F) reactions at 25 MeV. In 2008Su19, 85As was produced in 9Be(238U,X) at E(238U)=411 MeV/nucleon.

Mass measurements: 2008Ha23 (JYFLTRAP, Penning-trap method at IGISOL facility in Jyvaskyla). 2008Su19 (large-scale Isochronous Mass spectrometry at FRS-ESR facility in GSI). See also 2009Su04 and 2010Li02 (conference papers) from the same group as 2008Su19

2005Bo19: theoretical calculation of half-life and β-delayed neutron emission probability

Three γ rays of 101.9, 267 and 395 keV are reported from 85Ge β- decay to 85As, but no level scheme of 85As is proposed.

Q-value: Q(β-n)=4687 4, S(2n)=9662 4, S(2p)=28510 4 (2012Wa38)

XREFJπ(level) T1/2(level)
  0AB (3/2-) 2.021 s 12 
% β- = 100
% β-n = 62.9 20

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Additional Level Data and Comments:

  0(3/2-) 2.021 s 12 
% β- = 100
% β-n = 62.9 20
Measured delayed-neutron spectra: 1981ShZS, 1979Kr03, 1976Kr18 (also 1974Fr09), 1976Ru01, 1974Cr06, 1974Sh18, 1973Kr06, 1968To18, 1968To19, 1967De01, 1966To02.

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