272BH 276MT A DECAY (0.69 S) 2015GA24,2013RU11,2013OG0119NDS 201902
272BH H TYP=FUL$AUT=BALRAJ SINGH$CIT=NDS 156, 148 (2019)$CUT=31-Jan-2019$
272BH c See {+276}Mt Adopted Levels for production and half-life. In all the
272BH2c {+272}Bh produced from |a decay chain {+288}Mc -> {+284}Nh ->
272BH3c {+280}Rg -> {+276}Mt -> {+272}Bh; {+288}Mc was produced in the
272BH4c bombardment of {+243}Am target with {+48}Ca beam
272BH c 2015Ga24: measured E|a and |a|g-coin at Berkeley using the corner cube
272BH2c clover (C3) focal plane detector consisting of silicon-strip detectors
272BH3c surrounded by HPGe clover-type detectors. GEANT4 simulations. No K
272BH4c x-rays were definitively identified in this work, and Z identification
272BH5c was not possible
272BH c 2013Ru11: charged particles were detected with the TASISpec comprising
272BH2c a 32|*32-strip DSSSD and four additional 16|*16-strip DSSSD forming a
272BH3c cube-like detector, and the |g rays were detected with Ge detectors at
272BH4c GSI facility. Measured E|a, recoil-|a-|a, recoil-|a-fission, E|g,
272BH5c |a|g-coin, |a-decay curves.
272BH c 2013Og01, 2012Og02: measured |a spectrum in the range of 9.6 to 11.0
272BH2c MeV. Two activities assigned to the |a decay of {+276}Mt:
272BH3c 0.54 s {I+14-9} and 6 s {I+8-2}, but according to 2013Ru11, the 6-s
272BH4c activity is not certain, and if present, it could be assigned also to
272BH5c {+280}Rg or {+272}Bh
272BH c The decay scheme here is from 2015Ga24, as the authors provide more
272BH2c in-depth analysis of |a|g-coin data, while combining the data from
272BH3c their experiment and the 2013Ru11 GSI experiment. Note that
272BH4c many authors are the same in the two papers. In this respect, a
272BH5c 232-keV level proposed in 2013Ru11 is not included here, neither
272BH6c a 130-keV |g from 362 level, and a 202-keV |g from 434 level.
272BH cA $HF=T{-1/2}{+exp}/T{-1/2}{+sys}, using T{-1/2}=0.63 s {I+9-7} (based
272BH2cA on data from 2013Ru11 and 2013Og01) for {+276}Mt, and the systematic
272BH3cA half-lives calculated according to 2009Qi07
272BH cG $Coincidences between 135.7 {I26}- and 147.0 {I20}-keV photons seen
272BH2cG by 2015Ga24 was explained by the authors that 147-keV photon is
272BH3cG consistent with energy expected from Compton scattering of a 166-keV
272BH4cG photon in the material between the DSSD and the Ge detectors.
272BH cG E,RI$From 2015Ga24, where the analysis combined their experimental data
272BH2cG and those from 2013Ru11 experiment at GSI. Number of observed photons
272BH3cG for a certain |g-ray is from text on p5 in 2015Ga24.
272BH cG E(B)$Reversed ordering of the 166-136 |g cascade is also possible
272BH cG M$Multipolarity in square bracket assumed by 2015Ga24 for GEANT
272BH2cG simulations.
272BH cG M(A)$Determined by 2015Ga24 from their experimental data and GEANT
272BH2cG simulations, based on the expected counts of 166|g and 136|g as well
272BH3cG as the observation of |g|g-coincidences. The assignment is treated as
272BH4cG tentative by the evaluator
272BH cL E$From E|g data
276MT P 0 0.69 S +9-7 10100 9
276MT cP T$From {+276}Mt Adopted Levels
276MT cP QP$From 2017Wa10
272BH N 1.0 AP
272BH PN 6
272BH G 522.3 14
272BH cG $In coin with an escaped |a (2015Ga24)
272BH L 0.0 10.5 S +15-11
272BH cL T$from Adopted Levels
272BH A 9.95E+3 1
272BH cA E$8.52 to 10.01 MeV; Q(|a)=10.10 MeV {I1} (2017Og01 review);
272BH2cA 9.17-10.01 MeV (2015Og05 review); 9.17 to 9.95 MeV (2013Ru11);
272BH3cA 9.53 MeV and 9.60 MeV (2015Ru11), 9.71 MeV {I6} (2004Og03,2011Og07).
272BH4cA Assumed as g.s. to g.s. |a transition.
272BH L 60.2 10 ?
272BH A 9.90E3 10
272BH cA $HF=490 {I+70-60} (2015Ga24)
272BH L 196.2 10 ?
272BH cL E$226.2 keV if the ordering of 136|g-166|g cascade is reversed.
272BH2cL Ordering of the two |g rays is not established.
272BH G 136 1 (E1) 0.0878 AC
272BHF G FLAG=B
272BH cG $136|g and 166|g seen in |g|g coincidence (2015Ga24)
272BH cG RI$number of counts: 2 (2015Ga24)
272BH L 362.2 5
272BH cL $A tentative 130-keV |g was shown to a 232-keV level in 2013Ru11
272BH A 9600 10 80
272BH cA $HF=8.9 {I+13-11} (2015Ga24); 12 {I+3-2} (2013Ru11)
272BH cA E$average energy. Also noted as 9.60 MeV {I2} in text of 2015Ga24
272BH G 166 1 10 (E1) 0.0543 AC
272BHF G FLAG=B
272BH cG RI$number of counts=3 (2015Ga24)
272BH cG $Two more photons of 164.4 {I26} and 165.7 {I22} keV were observed
272BH2cG by 2015Ga24, in coincidence with 9.58 MeV {I2} and 9.55 MeV {I5}
272BH3cG particles. The photon energies are close to K{-|b2} x-rays of
272BH4cG 167.12 keV, but from intensity arguments, the 166-keV photons could
272BH5cG only be assigned as discrete |g ray.
272BH G 302 1 5 [E1] 0.0554 ?
272BH cG E$from 2013Ru11
272BH cG RI$number of counts=1 (2015Ga24)
272BH G 362.2 5 100 [E1] 0.0390 C
272BH cG RI$number of counts=7 (2015Ga24)
272BH cG $E|g=362 {I1}, mult=E2 in 2013Ru11
272BH cG $A pair of photons with energies of 126.6 {I12} and 227.0 {I25} keV
272BH2cG seen in |g|g-coin (2015Ga24), which the authors interpret as the two
272BH3cG summing to about 362 keV, and arising from the detection of two
272BH4cG Compton scattered photons between two of the unshielded Ge detectors.
272BH L 434 1 ?
272BH cL $A tentative 202-keV, M1 |g was shown to a 232-keV level in 2013Ru11
272BH A 9.53E3 5 C
272BH cA $HF=87 {I+13-11} (2015Ga24)
272BH G 434 1 [E1] 0.0278 C ?
272BH cG RI$number of counts=1 (2015Ga24)
272BH cG $In coincidence with 9530|a. However, no |a peak was observed in the
272BH2cG |a spectrum in coin with 434|g (2015Ga24), thus the placement of 434|g
272BH3cG is tentative
272BH cG $E|g=434 {I1}, mult=E2 in 2013Ru11
272BH L 479.6 23 ?
272BH A 9.48E3 5 C
272BH cA $HF=62 {I+9-8} (2015Ga24)
272BH cA E$also 9.50 MeV {I2} in the text in 2015Ga24
272BH G 479.6 23 [E1] 0.0232 C ?
272BH cG RI$number of counts=1 (2015Ga24)
272BH cG $In coincidence with 9480|a. However, no |a peak was observed in the
272BH2cG |a spectrum in coin with 479.6|g (2015Ga24), thus the placement of
272BH3cG 479.6|g is tentative