31AL 31MG B- DECAY (270 MS) 2005MA86,1993KL02,1984GU1922NDS 202209
31AL H TYP=FUL$AUT=Jun Chen and Balraj Singh$CIT=NDS 184, 29 (2022)$
31AL2 H CUT=24-Jun-2022$
31AL c 2005Ma86: {+31}Mg source was produced via Be({+36}S,X) with 77.5
31AL2c MeV/nucleon {+36}S beam on a 1014 |mg-thick Be target at GANIL.
31AL3c Fragments were analyzed and separated by the LISE3 spectrometer and
31AL4c implanted into a DSSD detector. |g rays were detected with 3 Clover
31AL5c Ge detectors and one low-energy photon spectrometer (LEPS). Measured
31AL6c E|g, I|g, |b|g-coin, |b|g|g-coin, fragment-|b time correlation.
31AL7c Deduced levels, parent T{-1/2}, J, |p, |b-decay branching ratios,
31AL8c log {Ift}, B(GT). Comparisons with theoretical calculations.
31AL d 2005Ma86 was considered with the inclusion an Erratum
31AL2d published in Phys Rev C 76, 059902(E) (2007)
31AL c 1993Kl02: Mg isotopes were produced by bombarding an Uranium Carbide
31AL2c target with 600 MeV protons from the CERN synchrocyclotron and
31AL3c separated by the ISOLDE2 separator. |b particles were detected with
31AL4c a thin plastic scintillator, neutrons were detected with an efficient
31AL5c detector, and |g rays were detected with two Ge detectors. Measured
31AL6c E|g, I|g, |b|g-coin, |b|g|g-coin, |b|g-n-coin. Deduced levels, J, |p,
31AL7c branching ratios, log {Ift}.
31AL c 1984Gu19: Mg isotopes were produced by bombarding a 30 g/cm{+2} Iridium
31AL2c target with 10 GeV proton beam from the CERN synchrotron. Fragments
31AL3c were separated and collected into a thin stainless steel tube. |g rays
31AL4c were detected with two Ge(Li) detectors and |b particles were detected
31AL5c with two plastic scintillators. Measured E|g, I|g, |b|g(t), |b|g-coin,
31AL6c |b|g|g-coin. Deduced levels, T{-1/2}, |g-ray branching ratios,
31AL7c |b-delayed neutron-emission probabilities. Other papers from the same
31AL8c group with the same experimental setup are 1984La03: measured %|b{+-}n,
31AL9c and 1979De02: measured 5 |g ray energies and intensities.
31AL c Other: 1977Bu11
31AL cB IB$From I|g intensity balance at each level
31AL cG E,RI$From 2005Ma86, unless otherwise noted. Weighted average are taken
31AL2cG where values from 1993Kl02 and 1984Gu19 are also available. Intensities
31AL3cG are relative to I|g(1612.8|g)=100. 2005Ma86 list the values as
31AL4cG I(|g+ce), but no multipolarities are assigned. The conversion
31AL5cG coefficients are however expected to be insignificant; thus, I(ce)
31AL6cG values are negligible.
31AL cG RI(A)$ Used value from Erratum (September 2007) by 2005Ma86 in
31AL2cG weighted average. Value was incorrect in the original paper by
31AL3cG 2005Ma86.
31AL cL E$From a least-squares fit to |g-ray energies.
31AL cL J,T$From Adopted Levels
31MG P 0 1/2+ 270 MS 2 11829 4
31MG cP J,T$From Adopted Levels of {+31}Mg
31MG cP QP$From 2021Wa16
31AL N 0.448 34 1.0 1.0
31AL cN NR$scaled from the original value of 0.368 in 2005Ma86 by a factor of
31AL2cN f1*f2 with f1=127.7/100 due to renormalization of I|g(1612.8|g) from
31AL3cN 127.7 {I93} in 2005Ma86 to 100 in this dataset by the evaluators, in
31AL4cN order to align intensities from 2005Ma86 relative to I|g(946.7|g)=100
31AL5cN with those from other studies (1984Gu19,1993Kl02) relative to
31AL6cN I|g(1612.8|g)=100, and f2=(100-6.2)/(100-1.7) accounting for the change
31AL7cN of %|b{-n} for {+31}Mg used in obtaining the total number of {+31}Mg
31AL8cN from measured |g intensities, from 1.7 {I3} quoted in 2005Ma86 to the
31AL9cN adopted 6.2 {I19}. The original value of 0.368 in 2005Ma86 is obtained
31ALacN by using absolute intensities deduced from the total number of {+31}Mg
31ALbcN which is derived from measured intensities of five |g-rays (not
31ALccN reported in 2005Ma86) from the decay of {+31}Al to {+31}Si and
31ALdcN previously known {+31}Al decay scheme. By assuming |S(I|g to
31ALecN g.s.)=93.8% {I19} from 100-%I{-|bn} (6.2 {I19} from Adopted Levels of
31ALfcN {+31}Mg) with no |b branch to the g.s. for |DJ=2, |D|p=no transition
31ALgcN and with no unobserved |g transitions to g.s., the evaluators obtain
31ALhcN 0.440 {I3}. Others: 0.39 {I8} (1993Kl02) and 0.36 {I11} (1984Gu19),
31ALicN deduced by evaluators from the ratios of absolute intensities to
31ALjcN relative intensities in each reference, which are significantly
31ALkcN different and appear to be less reliable because of an overestimate of
31ALlcN the |b feeding to the ground state, and incomplete level schemes
31ALmcN compared to that of 2005Ma86.
31AL cN BR$%|b{+-}n=6.2 {I19} (2008ReZZ,1995ReZZ). Note that %|b{+-}n=1.7 {I3}
31AL2cN (1984La03) is also reported.
31AL PN 3
31AL L 0.0 5/2(+) 644 MS 25
31AL L 946.7 4 1/2(+),3/2
31AL B 5.2 27 6.1 2
31ALS B EAV=5182.7 20
31AL G 946.7 5 82 5
31AL2 G %IG=37 4
31AL cG E$weighted average of 946.6 {I5} (1993Kl02), 946.9 {I10} (1984Gu19),
31AL2cG and 947.0 {I10} (2005Ma86)
31AL cG RI$weighted average of 78.3 {I56} (1993Kl02), 87.5 {I50} (1984Gu19),
31AL2cG and 78.3 {I57} (2005Ma86)
31AL L 1613.0 3 1/2+,3/2+
31AL B 10.6 20 5.7 1
31ALS B EAV=4853.5 20
31AL G 665.9 7 31.4 20
31AL2 G %IG=14.1 14
31AL cG E$weighted average of 666.2 {I7} (1993Kl02), 665.5 {I8} (1984Gu19),
31AL2cG and 665.7 {I13} (2005Ma86)
31AL cG RI$weighted average of 34.0 {I24} (1993Kl02), 29.4 {I20} (1984Gu19),
31AL2cG and 32.4 {I37} (2005Ma86)
31AL G 1612.8 4 100
31AL2 G %IG=44.8 34
31AL cG E$weighted average of 1612.8 {I4} (1993Kl02), 1612.8 {I6} (1984Gu19),
31AL2cG and 1612.9 {I8} (2005Ma86)
31AL L 3239.3 5 1/2+,3/2+
31AL B 28.8 24 4.88 4
31ALS B EAV=4050.2 20
31AL G 1626.2 5 68.1 18
31AL2 G %IG=30.5 25
31AL cG E$weighted average of 1626.2 {I5} (1993Kl02), 1626.2 {I6} (1984Gu19),
31AL2cG and 1626.4 {I12} (2005Ma86)
31AL cG RI$weighted average of 63.6 {I46} (1993Kl02), 68.8 {I18} (1984Gu19),
31AL2cG and 67.3 {I71} (2005Ma86)
31AL G 2291.7 14 1.17 25
31AL2 G %IG=0.52 12
31AL L 3433.3 5 1/2+,3/2+
31AL B 11.3 17 5.2 1
31ALS B EAV=3954.4 20
31AL G 1820.0 8 11.1 20 A
31AL2 G %IG=5.0 10
31AL cG E$weighted average of 1820.0 {I8} (1993Kl02), 1820.0 {I9} (1984Gu19),
31AL2cG and 1820.1 {I11} (2005Ma86)
31AL cG RI$unweighted average of 8.8 {I12} (1993Kl02), 9.4 {I11} (1984Gu19),
31AL2cG and 15.0 {I18} (2005Ma86)
31AL G 2487.4 12 4.1 7
31AL2 G %IG=1.84 34
31AL cG E$weighted average of 2487.6 {I15} (1993Kl02), 2487.5 {I18} (1984Gu19),
31AL2cG and 2487.3 {I12} (2005Ma86)
31AL cG RI$weighted average of 4.8 {I8} (1993Kl02), 3.8 {I10} (1984Gu19),
31AL2cG and 3.7 {I7} (2005Ma86)
31AL G 3432.8 8 10.0 26
31AL2 G %IG=4.5 12
31AL cG E$weighted average of 3431.8 {I12} (1993Kl02),3433.0 {I8} (1984Gu19),
31AL2cG and 3433.3 {I14} (2005Ma86)
31AL cG RI$2005Ma86 claim two very close |g-rays from different levels,
31AL2cG one from the 3433 level, the other from a 5046 level; the differences
31AL3cG were unresolved by earlier experiments and all the intensity from
31AL4cG earlier experiments is attributed to this level feeding alone.
31AL5cG Others: 16.2 {I15} (1993Kl02) and 15 {I2} (1984Gu19) for unresolved
31AL6cG doublet
31AL L 3623.0 6 1/2+,3/2+
31AL B 11.3 12 5.2 1
31ALS B EAV=3860.7 20
31AL G 2675.8 9 7.5 8
31AL2 G %IG=3.4 5
31AL cG E$weighted average of 2676.1 {I10} (1993Kl02),2675.6 {I9} (1984Gu19),
31AL2cG and 2675.6 {I13} (2005Ma86)
31AL cG RI$weighted average of 7.7 {I8} (1993Kl02), 6.3 {I14} (1984Gu19),
31AL2cG and 8.7 {I17} (2005Ma86)
31AL G 3623.0 8 17.8 15 A
31AL2 G %IG=8.0 9
31AL cG E$weighted average of 3621.9 {I13} (1993Kl02),3623.0 {I9} (1984Gu19),
31AL2cG and 3623.4 {I8} (2005Ma86)
31AL cG RI$weighted average of 18.2 {I15} (1993Kl02), 16.9 {I22} (1984Gu19),
31AL2cG and 18.4 {I52} (2005Ma86)
31AL L 4143.3 4 1/2+,3/2+
31AL B 12.5 13 5.0 1
31ALS B EAV=3603.9 20
31AL G 903.8 8 5.1 7
31AL2 G %IG=2.3 4
31AL cG E$weighted average of 904.0 {I8} (1993Kl02), 903.7 {I12} (1984Gu19),
31AL2cG and 903.6 {I11} (2005Ma86)
31AL cG RI$unweighted average of 5.3 {I6} (1993Kl02), 6.3 {I10} (1984Gu19),
31AL2cG and 3.8 {I4} (2005Ma86)
31AL G 2529.7 9 8.9 9
31AL2 G %IG=4.0 5
31AL cG E$weighted average of 2529.8 {I10} (1993Kl02), 2529.8 {I9} (1984Gu19),
31AL2cG and 2529.5 {I10} (2005Ma86)
31AL cG RI$weighted average of 8.7 {I9} (1993Kl02), 8.8 {I15} (1984Gu19),
31AL2cG and 9.8 {I18} (2005Ma86)
31AL G 3196.6 10 12.8 14
31AL2 G %IG=5.7 8
31AL cG E$weighted average of 3196.2 {I10} (1993Kl02), 3197.0 {I10} (1984Gu19),
31AL2cG and 3196.5 {I12} (2005Ma86)
31AL cG RI$weighted average of 13.0 {I14} (1993Kl02), 11.9 {I19} (1984Gu19),
31AL2cG 14.6 {I36} (2005Ma86)
31AL G 4143.2 6 1.1 4
31AL2 G %IG=0.49 18
31AL L 4563.7 5 1/2+,3/2+
31AL B 7.9 10 5.1 1
31ALS B EAV=3396.5 20
31AL G 2949.4 10 12.0 12
31AL2 G %IG=5.4 7
31AL cG E$weighted average of 2949.0 {I10} (1993Kl02), 2949.8 {I10} (1984Gu19),
31AL2cG and 2949.5 {I11} (2005Ma86)
31AL cG RI$weighted average of 12.3 {I12}(1993Kl02), 11.2 {I16} (1984Gu19),
31AL2cG and 13.1 {I29} (2005Ma86)
31AL G 3617.7 12 3.9 11 A
31AL2 G %IG=1.8 5
31AL G 4563.5 7 1.7 6
31AL2 G %IG=0.76 28
31AL L 4640.4 11 1/2+,3/2+
31AL B 1.6 4 5.8 1
31ALS B EAV=3358.7 21
31AL G 3693.0 19 2.9 8
31AL2 G %IG=1.3 4
31AL G 4640.3 13 0.63 24
31AL2 G %IG=0.28 11
31AL L 4809.1 15 ?
31AL cL E$reported in 1993Kl02 and 1984Gu19. This level was not seen in the
31AL2cL coincidence measurements or in the un-gated |g-spectrum (2005Ma86)
31AL B 1.0 3 5.9 1 ?
31ALS B EAV=3275.5 21
31AL G 4808.7 15 2.3 6 ?
31AL2 G %IG=1.03 28
31AL cG E$weighted average of 4809.0 {I15} (1993Kl02) and 4808.3 {I20}
31AL2cG (1984Gu19)
31AL cG RI$weighted average of 2.3 {I6} (1993Kl02) and 2.2 {I12} (1984Gu19)
31AL L 5046.5 14 1/2+,3/2+
31AL B 3.5 9 5.3 1
31ALS B EAV=3158.5 21
31AL G 3433.3 14 7.7 20
31AL2 G %IG=3.5 9
31AL L 5149.7 11 1/2+,3/2+
31AL B 2.9 5 5.4 1
31ALS B EAV=3107.6 21
31AL G 4202.7 10 6.4 9
31AL2 G %IG=2.9 5
31AL cG E$weighted average of 4201.1 {I14} (1993Kl02), 4203.2 {I10} (1984Gu19),
31AL2cG and 4203.5 {I17} (2005Ma86)
31AL cG RI$weighted average of 5.7 {I9} (1993Kl02), 7.5 {I12} (1984Gu19),
31AL2cG and 7.4 {I25} (2005Ma86)
31AL L 7157.9+X R
31AL cL E$x<4671 {I5} from Q(|b{+-})({+31}Mg)-S(n)({+31}Al),
31AL2cL where Q(|b{+-})=11829 {I4} and S(n)=7157.9 {I30} from 2021Wa16.
31AL3cL This represents a range of unobserved levels that subsequently decay
31AL4cL to {+30}Mg via one-neutron emission
31AL B 6.2 19
31AL cB IB$from adopted %|b{+-}n=6.2 {I19} for the decay of {+31}Mg g.s.