179AU 183TL A DECAY (53.3 MS) 2004RA28,1987TO09,1980SC0909NDS 200902
179AU H TYP=FUL$AUT=Coral M. BAGLIN$CIT=NDS 110, 265 (2009)$CUT=15-Nov-2008$
179AU c Other: 2006An11.
179AU c 2004Ra28:{+183}Tl from {+144}Sm({+42}Ca,p2n|g) at E=195 and 200 MeV
179AU2c using 95% enriched {+144}Sm target; RITU gas separator; fusion
179AU3c evaporation residues implanted in Si strip detector in focal plane; 3
179AU4c NORDBALL- and 2 TESSA-type Ge detectors; measured E|a, I|a, E|g, I|g,
179AU5c prompt |g-|a({+183}Tl) coin, |g|g coin. Supersedes 2002JeZY.
179AU c T{-1/2}({+183}Tl)=53.3 ms {I3} from fit to time difference between
179AU2c pairs of decay |a's and recoils, using an exponential fit to the decay
179AU3c curve and assuming an exponential background (2004Ra28). Other:
179AU4c 60 ms {I15} from 1980Sc09.
179AU c Parent J|p from evaluation in 2002Ba19.
179AU c Parent E: from E|a=7612 {I5} to {+183}Tl(g.s.) and E|a=7000 {I5} to 53
179AU2c ms {+183}Tl in {+187}Bi(9/2-) |a decay (2006An11).
179AU c The Q(|a)=5940 {I17} given in 2003Au03 assumed that a 6449|a fed the
179AU2c {+179}Au g.s. The |g data of 2004Ra28 are inconsistent
179AU3c with this assumption. Based
179AU3c on the adopted E|a=6338 {I6} from 625 {I7} level in {+183}Tl to
179AU4c 203.6+x level in {+179}Au, Q(|a)=6058+x 9, where x is the energy
179AU5c difference, if any, between the {+179}Au g.s. and the 0+x level at
179AU6c which the 52|g-89|g-62|g cascade observed by 2004Ra28 in |a decay
179AUxc terminates.
179AU c To identify the {+183}Tl |a decays, 2004Ra28 performed a correlation
179AU2c with subsequent {+179}Au |a decays within a search time of 1 s; this
179AU3c revealed the existence of a new E|a=5810 {I15} branch from {+179}Au.
179AU cA IA From 1980Sc09. I|a data from 2004Ra28 (given in comments)
179AU2cA are in excellent agreement, but a little less precise.
179AU cA HF Assuming r{-0}=1.513 {I9} (unweighted average of
179AU2cA r{-0}({+180}Hg)=1.505 {I13} and r{-0}({+178}Pt)=1.522 {I5} (1998Ak04))
179AUxcA and Q(|a)=6058 {I9}.
179AU cG E,RI From 2004Ra28.
179AU cG M The 52|g-62|g and 52|g-89|g coincidences are prompt and none
179AU2cG of the 52|g, 62|g and 89|g appears to be delayed with respect to |a's,
179AU3cG so 2004Ra28 conclude that the gammas have multipolarity no higher than
179AU4cG E1, M1 or E2.
179AU cL E Based on measured E|g, except as noted. The energy
179AU2cL offset 'x' allows for the possibility that the level fed by the 62|g
179AU3cL might not be the g.s.
179AU cL J From Adopted Levels. Authors' suggested values, based on
179AU2cL deduced transition multipolarities and an assumption that J values
179AU3cL decrease with decreasing level energy, are given in
179AU4cL comments on the relevant levels.
183TL P 625 7 (9/2-) 53.3 MS 3 6058 9
179AU N 0.061 2 0.061 2 0.015 3
179AU cN BR From mother-daughter intensity relations (2006An11). Other
179AU2cN Branching data: |?1.5% (tentative value based on one correlated
179AU3cN 7000|a({+187}Bi)-6380|a({+183}Tl) event) (1999Ba45). 2004Ra28 estimate
179AU4cN %|a|?2 based on total I|a compared with I|g for the delayed 347|g
179AU5cN feeding the 9/2- isomer of {+183}Tl.
179AU cN NR 0.061 {I2}, assuming I(|g+ce)(62)/I|a(total)=0.99.
179AU PN 3
179AU L 0.0+X (1/2+,3/2+,5/2+)
179AU cL J 2004Ra28 suggest (5/2+).
179AU L 61.8+X 3 (3/2-)
179AU cL E an alternative value of 89.4+x is possible because order of
179AU2cL 62|g-89|g cascade has not been firmly established.
179AU cL J 2004Ra28 suggest (3/2-).
179AU G 61.8 3 1233 35 E1 0.305 6 C
179AUS G LC=0.235 5$MC=0.0550 11$NC+=0.0157 3
179AUS G NC=0.0134 3$OC=0.00223 5$PC=8.34E-5 15
179AU cG M intensity balance at 62+x level rules out E2
179AU2cG and M1 and higher order multipolarity for the 62|g.
179AU L 86+X 13 100 US GT M
179AU2 L %IT=?$ %EC+%B+=?$ %A=?
179AU cL E from difference in adopted values of E|a to this level and
179AU2cL E|a to 203.6+x level.
179AU cL T from 2004Ra28; no |g observed in coincidence with |a
179AU2cL feeding this level.
179AU A 6453 11 1.0 3 3.6E2 14
179AU cA E weighted average of 6456 {I15} (2004Ra28), 6449 {I15}
179AUxcA (1980Sc09).
179AU cA Other I|a: 4 {I2} (2004Ra28).
179AU L 151.2+X 4 (7/2-)
179AU cL J 2004Ra28 suggest (7/2-). HF is consistent with a moderate
179AU2cL angular momentum change in |a decay without underlying structural
179AU3cL change; this suggests similar structure for the (7/2-) and (9/2-)
179AU4cL levels in {+179}Au.
179AU A 6381 11 16 2 12 3
179AU cA E weighted average of 6384 {I16} (2004Ra28), 6378 {I15}
179AUxcA (1980Sc09).
179AU cA Other I|a: 16 {I4} (2004Ra28).
179AU G 89.4 2 124 11(E2) 8.37 15 C
179AUS G KC=0.682 10$LC=5.76 11$MC=1.50 3$NC+=0.427 8
179AUS G NC=0.368 7$OC=0.0589 11$PC=0.0001272 20
179AU cG M probably E2. Observed shape of summed |a spectrum when gated
179AU2cG by 52|g is consistent with ce(L)(89)-|a summing; E1 would give
179AU3cG negligible ce-|a summing, M1 would lead to different shape due to
179AU4cG dominance of ce(K) over ce(L). Also, M1 is ruled out by the observed
179AU5cG low I(K| x ray) (2004Ra28) and E1 by intensity balance at the 62+x
179AUxcG level.
179AU L 203.6+X 4 (9/2-)
179AU cL J 2004Ra28 suggest (9/2-) based on unhindered |a decay from
179AU2cL (9/2-) parent.
179AU A 6338 6 83 4 1.6 4
179AU cA E weighted average of 6333 {I10} (2004Ra28), 6340 {I15}
179AU2cA (1987To09), 6343 {I10} (1980Sc09). This E|a implies
179AU3cA Q(|a)({+183}Tl)=6058+x 9 (cf. 5940 {I17} in 2003Au03 where the 6453|a
179AUxcA is assumed to feed the {+179}Au g.s.).
179AU cA Other I|a: 80 {I9} (including ce-|a sum peaks) (2004Ra28).
179AU G 52.4 2 109 10 M1 8.58 16 C
179AUS G LC=6.60 12$MC=1.53 3$NC+=0.456 9
179AUS G NC=0.382 7$OC=0.0701 13$PC=0.00473 9
179AU cG 52|g is in prompt coincidence with both the 89|g and the
179AU2cG 62|g. Placement is supported by 6384|a and 6333|a energy difference of
179AU3cG 51 {I19} (2004Ra28).
179AU cG M |a(exp)=11.5 {I14} (based on I|a=83% {I4} and adopted |g
179AU2cG normalization) rules out E1 and E2. Observed ce(L)-|a summing in
179AU3cG spectrum gated by 89|g is consistent with M1 or E2 (2004Ra28).