ADOPTED LEVELS for 65As

Authors: E. Browne, J. K. Tuli |  Citation: Nucl. Data Sheets 111, 2425 (2010) |  Cutoff date: 1-Aug-2009 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-1.38×104 keV SYS(n)= 1.54×104 keV SYS(p)= -9.E1 keV 9Q(α)= -2.23×103 keV 10
Reference: 2012WA38

References:
  A  65Se ε decay 

General Comments:

1993Wi03: 65As produced by fragmentation of 75-MeV/u 78Kr beam by an enriched 58Ni target and mass separation. Measured T1/2.

1991XuZZ: 65As produced by fragmentation of 20-MeV/u 64Zn beam incident on a Be target and mass separation; claims to be first identification of 65As; no other data.

1990Ro15: search for proton radioactivity of 65As was made with 40Ca(32S,αp2n) at E(32S)=200 MeV and 40Ca(28Si,p2n) at E(28Si)=175 MeV and mass separation. No such activity was observed in the proton energy range of 200-700 keV. Authors conclude that 65As must decay mostly by positron emission or by proton emission withT1/2 < 100 μs.

1989Ho19: search for proton radioactivity of 65As was made with 40Ca(28Si,p2n) at E(28Si)=87 MeV and mass separation. They looked for proton radioactivity in the energy range 250-600 keV and half-life of 10 μs to 100 ms. No such activity was observed and the authors established a lower production cross section limit of 1×10-6 barn.

1988HoZL, 1989HoZQ: search for proton radioactivity of 65As was made with 40Ca(28Si,p2n) at E(28Si)=140 MeV and separation of reaction products with a mass analyzer. No evidence was found for proton decay of 65As; the authors conclude that 65As decays predominantly by positron emission with a weak proton decay branch or its half-life is less than 5 μs which is below the detection capability of their equipment.

Q-value: Note: Current evaluation has used the following Q record

Q-value: ΔQ(β-)=600, ΔS(n)=320





E(level)
(keV)
XREF T1/2(level)
     0.0A 128 ms 16 
% ε = 100
  3420 87 A % p = 100

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0 128 ms 16 
% ε = 100
%ε+%β+: No evidence of ground state proton decay was found by 1993Wi03,1989Ho19. Relativistic mean field model predict stable against p emission (2001Pa02).
  3420 % p = 100
Decays to 64Ge by p, E(p)=3.52 MeV 2 (weighted average of 2011RoZZ and 1993Ba12).
E(level): Decays to 64Ge by p, E(p)=3.52 MeV 2 (weighted average of 2011RoZZ and 1993Ba12).

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