249MD 253LR A DECAY (0.63 S) 2022HU21,2009HE20,2008GA2524NDS 202403
249MD H TYP=FUL$AUT=C.D. Nesaraja$CIT=NDS 195, 718 (2024)$CUT=12-Oct-2023$
249MD c
249MD c 2022Hu21: {+253}Lr produced in the {+205}Tl({+50}Ti,2n) at the ATLAS
249MD2c linear accelerator at Argonne National Laboratory. The {+253}Lr
249MD3c was separated in the Argonne Gas-Filled Analyzer (AGFA) and then
249MD4c passed through a parallel grid avalanche counter (PGAC). It was
249MD5c then implanted into doublesided Si strip detector (DSSD). Alphas
249MD5c escaping the DSSD were deposited into an array of single-sided Si strip
249MD6c detectors (SSSD). Measured E|a, t{-1/2} and |a branching ratio.
249MD c 2010He11: |a decay from the {+253}Lr which was produced
249MD2c from the |a decay of {+257}Db was measured at the UNILAC accelerator
249MD3c at GSI, Darmstadt. {+257}Db, the evaporated residue was separated by
249MD4c the velocity filter SHIP and implanted into a 16-strip Si PIPS
249MD5c detector. Six Si detectors were used to measure escaping |a-particles
249MD6c from the decay of the {+253}Lr.
249MD c 2009He20: {+253}Lr produced in the {+209}Bi({+48}Ti,4n) reaction and
249MD2c from the |a decay of {+257}Db at the UNILAC accelerator at GSI
249MD3c Darmstadt. Evaporation residues were separated by the velocity filter
249MD4c SHIP and implanted into a 16-strip Si PIPS detector. A box of six
249MD5c Si wafers was used to measure escaping |a particles. A Ge clover
249MD6c detector consisting of four crystals was used to measure gammas in
249MD7c coincidence with particles. Measured E|a and half-life.
249MD c 2008Ga25: The {+257}Db isotope produced in {+209}Bi({+50}Ti,2n) and
249MD2c {+208}Pb({+51}V,2n) reactions at 4.7-5.1 MeV/nucleon beams of
249MD3c {+51}V and {+50}Ti provided by 88-Inch Cyclotron at
249MD4c LBNL. Detected |a particles using silicon implantation detectors.
249MD c 2001He35: |a decay from {+253}Lr which was produced
249MD2c from the |a decay of {+257}Db was measured at the UNILAC accelerator
249MD3c at GSI, Darmstadt. {+257}Db, the evaporated residue, was separated by
249MD4c the velocity filter SHIP and implanted into a 16-strip Si PIPS
249MD5c detector. Six Si detectors were used to measure escaping |a-particles
249MD6c from the decay of the {+253}Lr. The observed |a-spectra revealed
249MD7c the existence of an isomeric state.
249MD c 1986He28,1985He22: {+253}Lr was produced from heavy-ion fusion reaction
249MD2c of {+50}Ti and {+209}Bi. It was separated from the projectile beam
249MD3c by the velocity filter SHIP and identified after implantation into an
249MD4c array of position-sensitive surface-barrier detectors by analyzing
249MD5c the |a-decay chains. Measured E|a, t{-1/2} and |a branching ratio.
249MD c Other: 1999He11
249MD cA HF$The nuclear radius parameter r{-0}({+249}Md)=1.478 {I29} is deduced
249MD2cA from interpolation of radius parameters of the adjacent even-even
249MD3cA nuclides in 2020Si16
249MD cA IA$ Values quoted by 2022Hu21 have been multiplied by 1.37 to
249MD2cA convert to intensity per 100 decays of {+253}Lr (0.63 s).
249MD3cA Relative intensities given in 2022Hu21
249MD4cA are: 8785|a: 70 {I7}; 8660|a: 3 {I1}
253LR P 0.0 (7/2-) 0.63 S 5 8918 20
253LR cP QP$From 2021Wa16
253LR cP T$From weighted average of 0.65 s {I5} (2022Hu21), 0.43 s {I+23-11}
253LR2cP (2022Hu21), 0.67 s {I6} (2009He20) and 0.80 s {I+19-13} (2008Ga25).
253LR3cP Others from the same group as 2009He20: 0.57 s {I+7-6} (2001He35),
253LR4cP 0.7 s {I+5-2} (2010He11), 0.57 s {I+7-6} (1999He11).
253LR4cP T{-1/2} for {+253}Lr prior to 2022Hu21 is 0.57 s {I+7-6} (2013Br09)
253LR cP J$From Adopted Levels of {+253}Lr in ENSDF database (2013Br09)
249MD N 0.99 6
249MD cN BR$From %SF=1.0 {I6} (2017He08).
249MD2cN %|a for {+253}Lr prior to 2017He08 is |?98.7 (2013Br09)
249MD L 0.0 (7/2-) 24.8 S 10
249MD cL J,T$From Adopted Levels
249MD cL $Configuration=7/2-[514] (2022Hu21)
249MD A 8785 1495.9 14 0.8 6
249MD cA E$From 2022Hu21. Others: 8777 {I20} (2010He11), 8786 {I15} (2009He20),
249MDxcA 8794 {I10} (1999He11); 8800 {I20} (1986He28,1985He22)
249MD L 127 24(11/2-)
249MD cL E$From 2022Hu21
249MD cL J$From similarity with the 8420-keV line in {+255}Lr depopulating
249MD2cL the 7/2- level and feeding the 11/2- rotational state at |? 135 keV
249MD3cL in {+251}Md (2006Ch52)
249MD A 8660 204.1 14 8 7
249MD cA E$From 2022Hu21.