Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 20-FEB-2010 

Author: S. -c. Wu |  Citation: Nucl. Data Sheets 91, 1 (2000) |  Cutoff date: 15-Jul-2000 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=-1.35×104 keV SYS(n)= 1.59×104 keV SYS(p)= 7.E2 keV SYQ(α)= -7.8×103 keV SY
Reference: 2012WA38

  A  46Fe ε decay (13.0 MS) 

General Comments:

1992Bo37, 1987Po04: 46Mn observed from interaction of a 58Ni beam at E(58Ni)=55 MeV/u and 69 MeV/u with natural nickel target using magnetic separation, Wien filter and identification through time-of-flight and ΔE-E measurements. β+ decay scheme observed

2001Gi01 (also 2001Gi02): Ni(58Ni,X) E=74.5 MeV/nucleon. Fragments selected by the α-LISE3 fragment separator with a Be degrader and Wien filter at GANIL. Ions implanted in a Si-detector telescope which measured ΔE, E, and position. With tof measurements, started both by the cyclotrons’ high-frequency and a micro-channel plate detector before the Wien filter, implanted ions could be identified. The telescope was surrounded by Ge detectors to measure γ’s in the radioactive decay.

1994Bl10: 9Be(58Ni,X) E=650 MeV/nucleon, Fragment separator FRS at GSI facility, measured cross section for the production of 46Mn

2007Do17: 46Mn produced in fragmentation of 58Ni26+ beam at 74.5 MeV/nucleon with natural Ni target at SISSE/LISE3 facility in GANIL. Fragment separator=α-LISE3. Fragment identification by energy loss, residual energy and time-of-flight measurements using two micro-channel plate (MCP) detectors and Si detectors. Double-sided silicon-strip detectors (DSSSD) and a thick Si(Li) detector were used to detect implanted events, charged particles and β particles. The γ rays were detected by four Ge detectors. Coincidences measured between charged particles and γ rays. T1/2 measured by time correlation of implantation events due to 46Mn and subsequent emission of protons and/or γ rays. Total proton branching ratio is from time spectrum of events with energy >900 keV in the charged-particle spectrum. Possible small contributions from delayed-α and delayed-2p decays are ignored. 2007Do17 and 2001Go01 are from the same group. Some of the results in 2007Do17 are an improved analysis of experiments reported in 2001Gi01

Mass excess of g.s.=-12490 30 (2007Do17), -12375 120 (1992Bo37) from IMME analysis

Structure calculations using shell model: 1999Ca12: levels, B(E2), G-T sum rules, etc.

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

Q-value: Estimated uncertainties: 370 for Q(β-), 320 for S(n), 520 for S(p), 230 for Q(α) (2009AuZZ,2003Au03).

Q-value: Q(εp)=12220 110 (syst,2009AuZZ,2003Au03)

XREFJπ(level) T1/2(level)
     0.0A (4+) 36.2 ms 4 
% ε = 100
% εp = 57.0 8
  5017 71 A 0+  

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Additional Level Data and Comments:

     0.0(4+) 36.2 ms 4 
% ε = 100
% εp = 57.0 8
XREF: α(?).
  50170+   This state is expected to decay by proton emission. The 2p decay mode is energetically possible but predicted rate is small. From measurements in 2007Do17, only 7.9% 32 proton branch is known, with no evidence for 2p decay mode.

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