Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 10-MAY-2009 

Author: Huo Junde |  Citation: Nucl. Data Sheets 109, 787 (2008) |  Cutoff date: 30-Apr-2007 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=1.16×104 keV SYS(n)= 1.6×103 keV SYS(p)= 2.06×104 keV SYQ(α)= -1.49×104 keV SY
Reference: 2012WA38

General Comments:

1997Be70: 55Ca identified in 9Be(238U,F), E=750 MeV/nucleon, fragments separator (FRS) at GSI facility, identification by time-of-flight. Measured production cross section

2008Ma01: 55Ca isotope produced in 9Be(76Ge,X) reaction at E=140 MeV/nucleon 76Ge beam provided by NSCL at Michigan State University. Isotopes separated with A1900 fragment separator. Time-of-flight technique. Measured β particles using Beta Counting System of three Si PIN detectors, a double-sided silicon strip detector and six single sided silicon strip detectors. Detected γ rays using 16 Ge detectors of the Segmented Germanium array. Measured half-life of 55Ca by fitting the decay curves to a function which included decay of the parent, growth and decay of daughter and a constant background. No gamma rays were seen in correlation with β rays.

Structure calculations: 1998Br30 and 1995Ri05 (binding energies, levels), 1976Da02 (mass excess)

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

Q-value: ΔQ(β-)=1020, ΔS(n)=990, ΔS(p)=1140, ΔQ(α)=990 (syst,2009AuZZ,2003Au03)

Q-value: Q(β-n)=8030 790, S(2n)=6360 860, S(2p)=37300 1220 (syst,2009AuZZ, 2003Au03)

Jπ(level) T1/2(level)
  0 (5/2-) 22 ms 2 
% β- = 100
% β-n = ?

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Additional Level Data and Comments:

  0(5/2-) 22 ms 2 
% β- = 100
% β-n = ?
Calculated (1997Mo25) populations of daughter nuclides: 99% for 55Sc, 0.9% for 54Sc through β-n decay and 0.4% for 53Sc through β-2n decay. 2008Ma01 calculated %β-n=4.

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