254CF    254ES EC DECAY (39.3 H)                                 19NDS    201902
254CF  H TYP=FUL$AUT=BALRAJ SINGH$CIT=NDS 156, 1 (2019)$CUT=31-Jan-2019$
254CF c  The expected 4+ member of the g.s. band in {+254}Cf at about 160 keV
254CF2c  can also be populated weakly by second-forbidden |b transition.
254CF3c  The systematics of known negative-parity levels in even-A Cf isotopes
254CF4c  suggests that these levels are higher than the Q(|e) value of 649 keV.
254CF3c  According to the theoretical calculations, energy of the 2+ bandhead of
254CF4c  |g-vibrational band is calculated as 553 keV by 2012Jo05, |?1 MeV by
254CF5c  2002Pr01, and |?700 keV by 1965Be40. From experimentally known values
254CF6c  of the 2+ member of the |g-vibrational band at 1032 keV in {+250}Cf,
254CF7c  805 keV in {+252}Cf, expected value for the 2+ |g-vibrational band
254CF8c  member in {+254}Cf is |?600 keV, which could be populated in the decay
254CF9c  of {+254m}Es, but no |g rays from such a state have been seen e.g. in
254CFAc  the detailed |a and |b{+-} study of {+254m}Es decay by 1973Ah04.
254CF c  1955Ha35 had shown population of {+254}Cf from the |e decay of
254CF2c  {+254}Es. The branching ratio for this decay mode was determined by
254CF3c  1963Ph01
254ES  P 84.2      25 2+               39.3 H    2              649       12
254ES cP E,J,T$From {+254}Es Adopted Levels.
254ES2cP Proposed configuration=|p7/2[633]~#|n3/2[622],K|p=2+ (1975Go05)
254ES cP QP$From 2017Wa10
254CF  N                       0.00076 7  1315.8
254CF cN BR$%|e=0.076 {I7} from |e/|b{+-}=0.078 {I6} (measured by 1963Ph01
254CF2cN for the decay of 39.3-h {+254}Es)
254CF  L   0            0+              60.5 D   2
254CF cL T$from Adopted Levels
254CF cL $Assumed that the ground state of {+254}Cf is populated indirectly
254CF2cL by |g transitions from higher levels
254CF  L  50       SY [2+]                                                     S
254CF cL E,J$level not seen experimentally. Energy and J|p here is from
254CF2cL systematics of known 2+ g.s. band members in A=244-252 Cf isotopes.
254CF3cL Since the 84.2 level in {+254}Es is likely K|p=2+,
254CF4cL |p7/2[633]~#|n 3/2[622] state, high log| {Ift} value of |?10 is
254CF5cL consistent with K-forbiddenness for the |e transition
254CF  E                         0.076 7   9.9                                 ?
254CFS E CK=0.7000 18$CL=0.2180 13$CM+=0.0820 6
254CF cE IE$assumed all the |e feeding to this level