249FM 253NO A DECAY 2012HE09,2006LO12,2004HE2824NDS 202403
249FM H TYP=FUL$AUT=C.D. Nesaraja$CIT=NDS 195, 718 (2024)$CUT=12-Oct-2023$
249FM c 2012He09: {+253}No was produced in {+207}Pb({+48}Ca,2n) reaction.
249FM2c The {+48}Ca beam at E=218.4 MeV from the UNILAC accelerator at GSI
249FM3c bombarded a 98.9% enriched {+207}Pb target. Evaporation
249FM4c residues were separated using the velocity filter SHIP. They were
249FM5c then implanted into a position-sensitive 16-strip PIPS detector
249FM6c at the focal plane The PIPS detector was used to measure |a
249FM7c decay energy of the implanted nuclei and their daughter products.
249FM8c It was surrounded in backward hemisphere by a box of silicon
249FM9c detectors to stop |a particles. Gamma rays were detected
249FMac using a four crystal Ge-clover detector shielded with Cu, Cd, Pb
249FMdc (Expt.1), and VEGA-type detector without shielding (Expt.2)
249FMec FWHM=1.7 keV (Expt.1) and FWHM=2.5 keV (Expt.2) for the 279.5 keV
249FMec |g-rays. Measured E|g, I|g, E{-|a}, I{-|a}, |a|g coin (|Dt|<|+0.4 |ms).
249FMfc Deduced level scheme, J|p, and simulated the sum energy (E{-|a}+E{-ce})
249FMgc spectra as a function of the implantation depth of {+253}No by GEANT4
249FMhc code.
249FM c 2004He28,2004He04,1997He29 (same group as 2012He09):
249FM2c {+253}No produced in {+207}Pb({+48}Ca,2n)
249FM2c Residues separated by SHIP velocity filter and
249FM3c implanted into PIPS of GSI. Measured |a, |g, |g|g coin,
249FM4c |a|g coin. Prompt and delayed spectra following |a decay of {+253}No.
249FM c 2011Lo06: (The same group as 2006Lo12 at FLNR, JINR. However, 2011Lo06
249FM2c did the measurements with increased efficiency of their detector
249FM3c system and revisited the decay scheme). {+253}No was produced in
249FM2c {+207}Pb({+48}Ca,2n). The residues were separated by VASSILISSA
249FM3c recoil separator and implanted into the GABRIELA detection system at
249FM4c focal plane. The detectors consisted of 48x48 strip
249FM5c Double-Sided-Silicon strip Detector (DSSD), 32-strip silicon detector
249FM6c upstream and a Ge detector. The efficiency for |g ray detection was
249FM7c increased to 16.4% for 100-keV photon and 3.4% at 1332 keV.
249FM8c Measured |a, |g, |g|g coin, |a|g coin, conversion
249FM9c electrons and |a(ce) coin and prompt and delayed spectra following
249FMac |a decay of {+253}No. Confirmed the work of 2006Lo12 and observed
249FMbc a new |a-group to a (7/2-) state at 669 keV
249FM c 2006Lo12 and 2006Po10: (Same group as 2011Lo06 but used the position
249FM2c sensitive 16-strip silicon detector.) {+253}No was produced in
249FM3c {+207}Pb({+48}Ca,2n). The residues were separated by VASSILISSA
249FM4c recoil separator and implanted into GABRIELA detection system at
249FM5c FLNR, JINR. The detectors consisted of 16-strip silicon detectors
249FM6c at the focal plane, 4-strip silicon detectors upstream and the Ge
249FM7c detector. The source was mixed with
249FM5c {+254}No which made it impossible to determine the absolute |a decay
249FM6c branching ratios. Measured |a, |g, |g|g coin, |a|g coin, conversion
249FM7c electrons and |a(ce) coin. Prompt and delayed spectra following
249FM8c |a decay of {+253}No.
249FM c 1997He29: |a decay chain {+257}Rf|){+253}No was studied at the UNILAC
249FM2c accelerator at GSI, Germany. The evaporation residue (ER) from the
249FM3c {+208}Pb({+50}Ti,n) were separated in the SHIP velocity fiter and then
249FM4c passed through a TOF system and finally implanted into a position
249FM5c sensitive 16-strip silicon wafer. Measured E|a, |a|a correlations and
249FM6c excitation functions, and half-lives. There may be some indication that
249FM7c the {+253}No |a decay involves the decay of two isomers. Possibly the
249FM8c 8063 |a are correlated with the |a's from 3.9 s {+257}Rf, however
249FM9c no final conclusion was made
249FM c
249FM cA E(G)$Broad distribution of alpha particles was observed by 2012He09.
249FM2cA The shape analysis of the measured |a spectra was compared to
249FM2cA GEANT simulations that lead to evidence for weak
249FM3cA |a decay branches of {+253}No into g.s. of {+249}Fm or the
249FM4cA ground-state rotational band. In the simulations, by GEANT4 code,
249FM5cA (E{-|a}+E{-ce}) and a total of 0.7% |a decay branch to the g.s.
249FM6cA rotational band were considered
249FM cG M$From the experimental internal conversion data. The numerical values
249FM2cG of the conversion coefficients data from 2006Lo12 listed in the
249FM3cG comments were read from Figure 6 of 2006Lo12
249FM cL E$From least-squares fit to E|g data except as noted
249FM cL J$From Adopted levels
249FM cL BAND(A)$ 7/2[624]
249FM c
249FM#t
249FM#t Fm K-x rays (keV) (measured by 2012He09)
249FM#t -------------------------------------------
249FM#t 115.3 {I2} K{-|a2}
249FM#t 121.1 {I2} K{-|a1}
249FM#t 136.4 {I2} K{-|b1}
249FM#t 140.6 {I2} K{-|b2}
249FM#t -------------------------------------------
249FM#t
249FM c
249FM DG CC$FROM BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
249FM cA HF$The nuclear radius parameter r{-0}({+249}Fm)=1.4730 {I54}
249FM2cA is deduced from interpolation (or unweighted average) of radius
249FM3cA parameters of the adjacent even-even nuclides.
253NO P 0.0 (9/2-) 94.0 S 12 8415 4
253NO cP J$From Adopted Levels of {+253}No in the ENSDF (2013Br09)
253NO cP T$From weighted average of 100.0 s {I55} (2018Ac08), 102 s {I12}
253NO2cP (2017Mi01), 93.6 s {I12} (2009He23), 94 s {I+11-9} (2009Qi04),
253NO3cP 95 s {I10} (1967Mi03), 105 s {I20} (1967Gh01).
253NO cP QP$From 2021Wa16
249FM N 0.536 0.55 3
249FM cN NR$From I(|g+ce)=99.3 for all gammas from 209, 279 and 669 levels,
249FM2cN allowing for 0.7% relative |a feeding to g.s. or ground-state band.
249FM3cN It is considered approximate due to unplaced 75.0|g and other
249FM4cN uncertain features of the decay scheme
249FM cN BR$From Adopted Levels of {+253}No in ENSDF database (2013Br09)
249FM PN 3
249FM G 75.0 2 1.3 3
249FM cG E$75|g in coincidence with |a events ranging from 8050-8100 keV.
249FM2cG
249FM L 0.0 (7/2+) 2.05 M 25 A
249FM cL T$From Adopted Levels
249FM cL $Configuration=7/2[624]
249FM A 8280 20 G
249FM cA E$From 2006Lo12
249FM L 58.20 17 (9/2+) A
249FM A 8220 20 G
249FM cA E$From 2006Lo12
249FM G 58.3 2 1.3 3 (M1) 50.6 9
249FMS G LC=37.8 7$MC=9.36 16
249FMS G NC=2.62 5$OC=0.691 12$PC=0.1342 23$QC=0.00758 13
249FM cG E,RI$From 2012He09. E(58|g) was also seen in 2011Lo06 (shown in Fig.4
249FM2cG in 2011Lo06)
249FM cG M$From 2012He09 who notes that for M1 transition, the expected
249FM2cG I(|g+ce)(58.3|g)/I(|g+ce)(221.5|g)=1. The experimental
249FM2cG ratio is 0.73 {I25} for M1, 4.1 {I15} for E2, 0.022 {I10} for E1; thus
249FM3cG M1 (or M1 with small E2 admixture) for 58.3|g is most probable.
249FM cG $It is noted by the evaluator that if 58.3|g is pure M1, I|g should be
249FM2cG 2.1, deduced from |g intensity balance at 58.2 level:
249FM3cG I(|g+ce)(58.3|g)=I(|g+ce)(221.5|g)=109.2 units. If I|g=1.3 {I3} is
249FM4cG correct, then 58.3|g may be M1+E2 with |d |? 0.35.
249FM L 129.2 3 (11/2+) A
249FM A 8150 20 G
249FM cA E$From 2006Lo12
249FM G 71 S
249FM cG E$Expected by 2006Lo12 based on the 150|g in coincident with |?55-
249FM2cG and |?70-keV electrons and the presence of a structure at 100 keV in
249FM3cG the electron single spectrum
249FM G 129.2 4 1.0 2 E2 8.19 16
249FMS G LC=5.88 12$MC=1.690 34
249FMS G NC=0.481 10$OC=0.1216 24$PC=0.0195 4$QC=9.24E-5 17
249FM cG E,RI$From 2012He09
249FM cG M$From |a(LMN+)exp=4.0 {I18} (2006Lo12),.
249FM L 140 20 ?
249FM cL E$Calculated by the evaluator from E|a in 1997He29.
249FM2cL May consist of unresolved doublet as observed by 1997He29
249FM A 8144 20
249FM cA E$Observed by 1997He29 who noted that it may consist of an
249FM2cA unresolved doublet
249FM L 209.30 20 (5/2+)
249FM cL $Configuration=5/2[622]
249FM A 8078 10 3.9 5 62 9
249FM cA E$Weighted average of 8075 {I15} (2012He09) and 8080 {I10} (2011Lo06).
249FM2cA Others: 8063 {I74} (1997He29), 8070 {I10} (2006Lo12)
249FM cA IA$Estimated by evaluator from intensity balance.
249FM2cA 2012He09 gives I|a= 4.2 {I6}
249FM G 209.3 2 1.1 1 M1 5.61 8
249FMS G KC=4.35 6$LC=0.945 13$MC=0.2335 33
249FMS G NC=0.0652 9$OC=0.01722 25$PC=0.00334 5$QC=0.0001866 27
249FM cG E$weighted average of 209.3 {I2} (2012He09) and
249FM2cG 209.5 {I5} (2011Lo06)
249FM cG RI$From 2012He09
249FM cG M$From |a(LMN+)exp=2.8 {I22} (2006Lo12),
249FM2cG |a(K)exp=4.4 {I12} (2012He09), |a(K)exp=4.9 {I19} (2012He09)
249FM3cG |a(LMN+)exp=3.42 {I87} (2011Lo06)
249FM L 248 17
249FM cL E$Calculated by the evaluator from E|a in 1997He29
249FM A 8038 17
249FM cA E$From 1997He29
249FM L 279.80 16 (9/2-)
249FM cL $Configuration=9/2[734]
249FM A 8007 4 95.2 52 1.47 12
249FM cA E$Weighted average of 8004 {I10} (2012He09) and 8007 {I4} (2011Lo06).
249FM2cA Others: 8011 {I93} (1997He29), 8003 {I5} (2006Lo12),
249FM3cA 8004 {I5} (2004He28)
249FM cA IA$Estimated by the evaluator from
249FM4cA 100-(Summed |a branches to g.s., 209.30, and 669.5 -keV levels).
249FM5cA 2012He09 gives I|a= 95.8 {I1}
249FM G 150.6 3 18 1 E1 0.2151 32
249FMS G KC=0.1594 23$LC=0.0416 6$MC=0.01035 15
249FMS G NC=0.00287 4$OC=0.000734 11$PC=0.0001266 19$QC=4.54E-6 7
249FM cG E$weighted average of 150.4 {I2} (2012He09) and
249FM2cG 151.2 {I4} (2011Lo06)
249FM cG RI$From 2012He09
249FM cG M$From |a(LMN+)exp=0.11 {I3} (2006Lo12),
249FM2cG |a(K)exp<0.98 (2004He28), |a(L)exp<0.3 (2004He28),
249FM3cG |a(LMN+)exp=0.11 {I2} (2011Lo06)
249FM G 221.7 2 100 E1 0.0916 13
249FMS G KC=0.0698 10$LC=0.01631 23$MC=0.00404 6
249FMS G NC=0.001119 16$OC=0.000289 4$PC=5.14E-5 7$QC=2.054E-6 29
249FM cG E$weighted average of 221.5 {I2} (2012He09) and
249FM2cG 221.8 {I2} (2011Lo06)
249FM cG RI$From 2012He09
249FM cG M$From |a(LMN+)exp=0.04 {I1} (2006Lo12),
249FM2cG |a(K)exp<0.17 (2004He28), |a(L)exp<0.05 (2004He28),
249FM3cG |a(LMN+)exp=0.023 {I4} (2011Lo06)
249FM G 279.7 2 44 1 E1 0.0556 8
249FMS G KC=0.0429 6$LC=0.00953 13$MC=0.002349 33
249FMS G NC=0.000652 9$OC=0.0001687 24$PC=3.05E-5 4$QC=1.294E-6 18
249FM cG E$weighted average of 279.5 {I2} (2012He09) and
249FM2cG 279.8 {I2} (2011Lo06)
249FM cG RI$From 2012He09
249FM cG M$|a(LMN+)exp=0.08 {I2} (2006Lo12), |a(K)exp=0.12 {I3}
249FM2cG (2006Lo12), |a(K)exp<0.35 (2004He28), |a(L)exp<0.1 (2004He28),
249FM3cG |a(K)exp=0.145 {I22} (2011Lo06), |a(LMN+)=0.076 {I12} (2011Lo06).
249FM L 669.5 4 (7/2-)
249FM cL $Configuration=7/2[743]
249FM A 7619 15 0.24 6 24 7
249FM cA E$Weighted average of 7620 {I15} (2012He09) and 7615 {I4} (2011Lo06).
249FM cA IA$Estimated by evaluator from intensity balance.
249FM2cA 2012He09 gives I|a= 0.25 {I6}
249FM G 669.5 4 0.43 11 [E1] 0.0102314
249FMS G KC=0.00814 11$LC=0.001571 22$MC=0.000382 5
249FMS G NC=0.0001059 15$OC=2.77E-5 4$PC=5.22E-6 7$QC=2.64E-7 4
249FM cG E$From 2012He09