59CO    59NI EC DECAY                 1991JA02,2015PF02         18NDS    201808
 59CO  H TYP=FUL$AUT=M. Shamsuzzoha Basunia$CIT=NDS 151, 1 (2018)$
 59CO2 H CUT=1-Apr-2018$
 59CO C  Others: 1951BR05, 1951WI14, 1956SA32, 1963SC06, 1974CH06, 1976BE02.
 59CO C  1991Ja02: 59NI activity was prepared by neutron irradiation of 188 mg
 59CO2C  Ni metal enriched to 99.927% in 58NI for 167 days at a neutron flux of
 59CO3C  1.3 |* 10{+14} cm{+-2} s{+-1}. After chemical separation from
 59CO4C  contaminant activities, 10 mm diameter pellets were prepared. ^K
 59CO5C  x-rays were measured with a Si(Li) detector. Also internal
 59CO6C  bremsstrahlung in coincidence with ^K x-ray was measured using Si(Li)
 59CO7C  detector and a proportional counter.
 59CO C  2015Pf02: Re-analysis of |g spectrum coincident with cobalt K x-rays
 59CO2c  observed in the decay of {+59}Ni from 1991Ja02. The high energy side,
 59CO3c  E|g > 600 keV, cannot be reproduced with a radiative electron capture
 59CO4c  calculation. A considerably better description is obtained when
 59CO5c  a virtual |b- transition to the 1099 keV level is introduced.
 59CO CE           For studies of internal bremsstrahlung spectrum,
 59CO2CE see 1956SA32, 1963SC06, 1976BE02, 1991JA02.
 59CO CL J         From Adopted Levels.
 59CO  N 1.0                   1.0       1.0
 59NI  P 0.0         3/2-              7.6E+4 Y  5              1073.00   19
 59CO  L 0.0         7/2-
 59CO  E              3.7E-5 1299.99696 1 11.89   3             99.997    3
 59COS E EAV=24.69 27$CK=0.8872$CL=0.09607$CM+=0.01672
 59CO CE IB        %IB+=3.7E-5 12 from I(B+)/I(ECK)=4.2E-7 13 (1991JA02),
 59CO2CE assuming CK/EC=0.887.  Other: I(B+)/I(EC)=1.5E-7 (1976BE02).  Note that
 59CO3CE allowed |b decay theory gives %IB+=0.00152 9, AP 2 orders of magnitude
 59CO4CE larger than experiment.
 59CO CE IE        99.997 - %IB+.
 59CO CE           ECL/ECK=0.121 2 (1974CH06).
 59CO  L 1099.256  3  3/2-
 59CO cL E$The energy of this level exceeds the decay Q(|b{+-})value.
 59CO2cL From re-analysis of |g spectrum coincident with cobalt K x-rays
 59CO2cL observed in the decay of {+59}Ni in 1991Ja02, 2015Pf02 propose the
 59CO3CL population through virtual or 'detour' transitions.
 59CO  E                       3.41E-3 AP                       0.00341   AP
 59CO cE IE$The energy of this level exceeds the decay Q(|b{+-})value,
 59CO2cE therefore it can be populated only through virtual or 'detour'
 59CO3cE transitions.  From the statement that the virtual and interference
 59CO4cE of 2% and 2.3%, respectively, of
 59CO5cE the integrated radiative electron capture gamma spectrum above
 59CO6cE 195 keV, a branching ratio of 3.41|*10{+-3} per 100 decays
 59CO7cE of {+59}Ni is deduced in 2015Pf02.