71BR 71KR EC DECAY (94.9 MS) 2022WA34,1997OI01 NDS23 202303
71BR H TYP=FUL$AUT=Balraj Singh and Jun Chen$CIT=NDS 188, 1 (2023)$
71BR2 H CUT=17-Jan-2023$
71BR c 2022Wa34: {+71}Kr produced in {+9}Be({+92}Mo,X),E=140 MeV/nucleon
71BR2c reaction, followed by separation of ions of interest using A1900
71BR3c fragment separator and a Radio Frequency Fragment Separator (RFFS)
71BR4c at the Coupled Cyclotron Facility of NSCL-MSU. The ions in the cocktail
71BR5c beam were implanted into the |b-counting station (BCS), which consisted
71BR6c of a stack of PIN detector (PIN2) and Double-Sided Silicon-Strip
71BR7c Detector (DSSSD) for detection of implants, surrounded by the SeGA
71BR8c array of 16 HPGe detectors for |g detection. Measured E|g, I|g,
71BR9c (implants)|b-coin, (implants)(|b-delayed protons)-coin,
71BRAc (implants)|g|g-coin, (implants)|b|g-coin, T{-1/2} of decay of {+71}Kr.
71BRBc Deduced absolute (per 100 decays of parent) number of |b|g-coin events,
71BRCc |b events, absolute (per 100 decays of parent) intensities of |g rays,
71BRDc and intensities of |b-delayed protons.
71BR c 1997Oi01: {+93}Nb(p,X) at 1 GeV, CERN-ISOLDE facility. Pure Kr
71BR2c beam was implanted into an aluminized Mylar film. Measured E|g, I|g,
71BR3c |b, |b-delayed protons, |g|g, |g|b coin, T{-1/2}. Detection system:
71BR4c gas-Si detector telescope for protons, HPGe detectors for |g and x
71BR5c rays, telescope plastic scintillation detectors for high-energy
71BR6c |b rays, gas-Si detector for low-energy |b rays.
71BR c 2005Fi10: reinterpretation of |g-ray spectrum in 1997Oi01, but
71BR2c details of these results are not available.
71BR c 1982Ha32: isotopic identification and measurement of half-life
71BR c 1981Ew01: {+93}Nb(p,X),E=1 GeV at CERN, chemical mass separation.
71BR2c plastic scintillator telescope; measured half-life
71BR c Production and identification of {+71}Kr:
71BR c 2002Lo13, 2002Bl17, 1995Bl23: C({+78}Kr,X),E=73 MeV/nucleon
71BR cE TI$Deduced by evaluators from I(|g+ce) balances in the decay scheme,
71BR2cE with g.s. |e+|b{++} feeding from 100-(|e+|b{++} feeding to the excited
71BR3cE states). The values are very slightly different from those in 2022Wa34.
71BR4cE The analysis of the |g-ray spectra and decay scheme by 2022Wa34 assumed
71BR5cE negligible |e+|b{++} feedings to the levels above the 407 level, which
71BR6cE seems justified by directly measured |b feeding of 89% in 2022Wa34.
71BR cG $1997Oi01 reported I|g(relative)<8 for a 262|g from a 262 level,
71BR2cG and I|g(relative)<10 for a 599|g from an 806 level; based on
71BR3cG observation of the |g rays and levels in in-beam |g-ray study by
71BR4cG 1990Ar23. These two |g were not reported by 2022Wa34 in the decay
71BR5cG of {+71}Kr
71BR cG E(a)$From 2022Wa34
71BR cG E(b)$From 2005Fi10 in {+40}Ca({+40}Ca,2|ap|g)
71BR cG RI$Absolute (per 100 decays of {+71}Kr) intensities from 2022Wa34
71BR cL $2022Wa34 reported little evidence for coincidence of 208|g from a
71BR2cL 407-keV |g; which would indicate population of the 615-keV level in
71BR3cL {+71}Br, as tentatively proposed by 2005Fi10, with 208|g and 407|g
71BR4cL from this level. In the decay scheme proposed by 2022Wa34, a 615 level
71BR5cL with J|p=3/2-,7/2- was listed, but it was assumed that this level was
71BR6cL not populated in the decay of {+71}Kr.
71BR cL E$From least-squares fit to E|g data
71BR cL J,T$From the Adopted Levels
71KR P 0 (5/2)- 94.9 MS 4 1018E1 13
71KR cP J,T$From {+71}Kr Adopted Levels
71KR cP QP$From 2021Wa16
71BR N 1.0 1.0 1.0 1.0
71BR cN NR$2022Wa34 determined absolute |g-ray intensities
71BR cN BR$%|ep=3.06 {I27} (2022Wa34) for the decay of {+71}Kr, deduced from
71BR2cN measurement of |b-delayed proton spectrum correlated with implants.
71BR3cN Other %|ep: 2.1 {I7} (1997Oi01), 5.2 {I6} (1995Bl23)
71BR PN 3
71BR L 0.0 (5/2)- 21.4 S 6
71BR cL J$5/2- in 2022Wa34
71BR E 91.3 9 0.156 7 3.65 3 91.5 9
71BRS E EAV=4353 65$CK=0.00150 7$CL=0.000171 8$CM+=3.42E-5 15
71BR cE TI$from 100-summed feeding to excited states. 91.6 {I20} in 2022Wa34;
71BR2cE 89% from |b measurement (2022Wa34), 82.1% {I16} (1997Oi01),
71BR3cE 68% (2005Fi10, from reanalysis of data in 1997Oi01)
71BR L 9.86 14 (1/2-)
71BR cL E$from the Adopted Levels
71BR cL J$1/2- in 2022Wa34
71BR G 9.86 14 [E2] 5.2E+3 4 2.7 7 S
71BRS G LC=4.4E+3 4$ MC=7.0E+2 6$ NC=45 4
71BR cG E$from the Adopted Levels, Gammas dataset
71BR cG TI$deduced by evaluators from intensity balance at 9.8-keV level
71BR L 207.97 16 (3/2-)
71BR cL J$3/2- in 2022Wa34
71BR E 1.0 8 0.0018 15 5.6 4 1.0 8
71BRS E EAV=4251 65$CK=0.00160 7$CL=0.000183 8$CM+=3.66E-5 17
71BR cE TI$1.02 {I71} in 2022Wa34. Other I(|e+|b{++}): 15.8% {I14} (1997Oi01),
71BR2cE based on relative efficiency of the |g-ray detectors with respect to
71BR3cE the particle telescope; 15% (2005Fi10, from reanalysis of data in
71BR4cE 1997Oi01). Both the values are in severe disagreement from that in
71BR5cE 2022Wa34
71BR G 198.0 2 2.07 60 (M1+E2) +0.21 7 0.0208 16 b
71BR cG $Others: E|g=198/199 (2022Wa34) as unresolved doublet; E|g=198,
71BR2cG I|g(relative)=100 (1997Oi01) or 85 from a reanalysis of
71BR3cG |g-ray spectrum in 1997Oi01. 2005Fi10 suggested that 198|g was a
71BR4cG doublet, with 15% of this intensity belonging to a 199|g from
71BR5cG 407 level, and 85% to 198|g from 208 level. This estimate is not
71BR6cG confirmed by 2022Wa34, where
71BR7cG I|g(198.0 from 208 level)/I|g(199.0 from 407 level)=0.81 {I25}.
71BR cG M,MR$from the Adopted Levels, Gammas dataset
71BRS G KC=0.033 19$LC=0.0039 23$MC=6.E-4 4 $NC=5.5E-5 31
71BR G 208.0 2 1.51 24 [M1+E2] 0.038 21 a
71BR cG $Other: E|g: 208, I|g(relative)=36 (1997Oi01). From a reanalysis of
71BR2cG |g-ray spectrum in 1997Oi01, 2005Fi10 suggested that 208|g was a
71BR3cG doublet with 207|g from 208 level, and a 208|g from a 615 level.
71BR4cG From I|g(207|g)/I|g(198|g)=19/81 (2005Fi10); I|g(208)(relative)|?20
71BR5cG from 208 level
71BRS G KC=0.033 19$LC=0.0039 23$MC=6.E-4 4 $NC=5.5E-5 31
71BR L 407.12 24 (5/2)-
71BR cL J$5/2- in 2022Wa34
71BR cL $Level proposed by 2005Fi10 from spectral data of 1997Oi01, and
71BR2cL confirmed by 2022Wa34
71BR E 4.4 4 0.0086 9 4.87 5 4.4 4
71BRS E EAV=4152 65$CK=0.00171 8$CL=0.000195 9$CM+=3.91E-5 18
71BR cE TI$4.32% {I36} (2022Wa34). Other: I(|e+|b{++})|?15% estimated by
71BR2cE 2005Fi10 based on |g-ray intensities deduced by the authors from
71BR3cE |g-ray spectrum of 1997Oi01, which is in severe disagreement with the
71BR4cE value in 2022Wa34.
71BR G 199.0 5 2.56 29 [M1+E2] 0.04 3 b
71BR cG $Other I|g(relative)|?16 deduced by 2005Fi10 from |g-spectrum in
71BR2cG 1997Oi01, and I|g(199|g)/I|g(407|g)=15/60 (2005Fi10).
71BR2cG This value is in severe disagreement with that from 2022Wa34
71BRS G KC=0.038 23$LC=0.005 3$ MC=0.0007 5 $NC=7.0E-5 4
71BR G 397.1 3 0.55 8 [E2] 0.00617 9 a
71BR cG $Other I|g(relative)|?27 deduced by 2005Fi10 from |g-spectrum in
71BR2cG 1997Oi01, and I|g(397|g)/I|g(407|g)=25/60 (2005Fi10)
71BR cG M$Q in the Adopted Levels, Gammas dataset
71BRS G KC=0.00546 8$LC=0.000605 9$ MC=9.59E-5 14 $NC=8.78E-6 13
71BR G 407.4 4 1.21 20 (M1+E2) -0.74 14 0.0044 13 a
71BR cG $Other I|g(relative)|?64 deduced by 2005Fi10 from spectrum in 1997Oi01
71BR cG M,MR$from the Adopted Levels, Gammas dataset
71BRS G KC=0.0039 12$LC=0.00043 13$ MC=6.8E-5 21 $NC=6.2E-6 19
71BR L 1861+X R
71BR cL E$S(p)({+71}Br)+x, where x<8319 keV, from Q(e)({+71}Kr)-S(p)({+71}Br)
71BR cL E$wide group from E(p)=1.5 to 5.5 MeV, this proton group feeding the
71BR2cL g.s. and the first excited state of {+70}Se (2022Wa34). Other:
71BR3cL |?4250 (1997Oi01) from wide group from E(p)|?2.3 MeV, a broad bump at
71BR4cL this energy, assuming that this proton group feeds the g.s. of {+70}Se
71BR E 3.06 27
71BR cE TI$from measured delayed-proton branch (2022Wa34). Others: 2.1% {I7}
71BR2cE (1997Oi01), 5.2% {I6} (1995Bl23)