ADOPTED LEVELS for 57Ca

Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 12-APR-2010 

Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 30-APR-2009 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=1.38×104 keV SYS(n)= 1.0×103 keV SYS(p)= 2.21×104 keV SYQ(α)= -1.61×104 keV SY
Reference: 2012WA38

General Comments:

2009Ta24, 2009Ta05: 57Ca identified by fragmentation of 76Ge beam at 132 MeV/nucleon at NSCL facility using A1900 fragment separator combined with S800 analysis beam line to form a two stage separator system. The transmitted fragments were analyzed event-by-event in momentum and particle identification. The nuclei of interest were stopped in eight Si diodes which provided measurement of energy loss, nuclear charge and total kinetic energy. The time-of-flight of each particle that reached the detector stack was measured in four different ways using plastic scintillators, Si detectors, and parallel-plate avalanche counters. The simultaneous measurement of ΔE signals, the magnetic rigidity, total kinetic energy and the time-of-flight (tof) provided unambiguous identification of the atomic number, charge state and mass number.

Theoretical calculations: 1998Br30 (levels, binding energy); 1995Ri05 (binding energy, mass defect); 1990Su06 (pygmy dipole resonances); 1976Da02 (mass excess); 2010Ta07 (calculated proton and neutron single-particle spectrum, neutron separation energies, rms charge radii)

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

Q-value: ΔQ(β-)=1220, ΔS(n)=1350, ΔS(p)=1310, ΔQ(α)=1410 (syst,2009AuZZ,2003Au03)

Q-value: Q(β-n)=10080 1220, S(2n)=5150 1220 (2009AuZZ,2003Au03)

Q-value: S(p) from 1997Mo25




E(level)
(keV)
T1/2(level)
  0 > 620 ns
% β- = ?
% β-n = ?
% β-2n = ?

Back to top

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
  0 > 620 ns
% β- = ?
% β-n = ?
% β-2n = ?
Measured cross section=47 fb +34-23 (e-mail reply of Nov 11, 2009 from O. Tarasov, first author of 2009Ta24).
E(level): Measured cross section=47 fb +34-23 (e-mail reply of Nov 11, 2009 from O. Tarasov, first author of 2009Ta24).

Back to top