249CF    249BK B- DECAY                2014CH47                  24NDS    202403
249CF  H TYP=FUL$AUT=C.D. Nesaraja$CIT=NDS 195, 718 (2024)$CUT=12-Oct-2023$
249CF c  2014Ch47: Half-life and |b end-point energy for {+249}Bk was
249CF2c  measured at Argonne National Laboratory. The {+249}Bk source was
249CF2c  produced at High Flux reactor of Oak Ridge National Laboratory followed
249CF3c  by chemical separation. For {+249}Bk half-life measurement, the sample
249CF4c  of {+249}Bk source was mixed with 0.10 |mCi of {+137}Cs source and
249CF5c  measured using |g-ray spectroscopy. An open thin source was used in
249CF6c  electron counting to measure the |b end-point energy. |g-rays were
249CF7c  measured with a Ge detector with FWHM=1.8 keV at 1332.5 keV. The |b-
249CF8c  spectrum was collected using the PIPS detector with FWHM=3.0 keV.
249CF7c  For half-life measurement, intensities of the Cm K|a{-2} and K|a{-1}
249CF8c  x rays, 333.37|g and 388.17|g rays from the |a decay of {+249}Cf,
249CF9c  and the 661.66-keV |g ray from {+137}Cs decay were measured for 62.5 h
249CFac  once a week for 728 days. The half-life was deduced from the growth
249CFbc  of 351-y {+249}Cf activity, and the ratios of the intensities of
249CFcc  x rays and |g rays.
249CF c  1990Po14: Measured relative L and M x-ray intensities from the decay
249CF2c  using the x-ray spectrometer
249CF c  1974Gl10: |b spectrum was measured with stiblenn crystal detector.
249CF2c  Maximum beta energy was determined via two different methods;
249CF3c  curie graph and absorption method. {+249}Bk half-life was
249CF4c  from decay curve.
249CF c  1959Va02: Measured beta spectrum from the decay of {+249}Bk using a
249CF2c  beta spectrometer, sodium iodide and anthracene
249CF3c  crystal spectrometers. Determined maximum end-point energy from
249CF4c  Fermi-Kurie plot
249CF c  1957Ea01: Determined half-life from decay data and estimated
249CF2c  maximum |b-particle from absorption curve
249CF c  Other: 1956Ch77
249BK  P 0            7/2+             327.2 D     3            123.6     4
249BK cP QP$From 2021Wa16
249BK cP J,T$From Adopted Levels.
249CF  N 1.0                   0.999986 1
249CF cN BR$From Adopted Levels
249CF  L 0.0          9/2-             351 Y     2
249CF cL J,T$From Adopted Levels
249CF  B              100                  7.019  5
249CFS B EAV=32.28 11
249CF cB E$123.6 keV {I4} (2014Ch47),123 {I3} (1974Gl10), 125 {I2} (1959Va02),
249CFxcB 114 {I15}(1957Ea01)