47K 47AR B- DECAY: TENTATIVE 2004WE09 25NDS 202507
47K H TYP=FUL$AUT=S. Ota and E.A. McCutchan$CIT=NDS 203, 1 (2025)$
47K 2 H CUT=1-Apr-2025$
47K c 2004We09: {+47}Ar activity produced by 1.4 GeV protons from the PSB
47K 2c accelerator impinging on a standard ISOLDE uranium carbide graphite
47K 3c target. Reaction products diffused from the heated target and effused
47K 4c {Ivia} a low-temperature, water-cooled transfer line to a standard
47K 5c FEBIAD MK-7 plasma ion source, where the ionization by plasma
47K 6c discharge took place. A tungsten converter to produce neutrons by the
47K 7c proton beam was placed parallel to the target, allowing one to switch
47K 8c to the neutron irradiation of the target by changing the focus of the
47K 9c proton beam from the target to the converter. In comparison to the
47K ac proton reaction, the neutron-induced reaction can suppress extreme
47K bc asymmetric fission products such as {+47}Ar. Thus, the two different
47K cc reactions help unambiguous identification of |g's originated from the
47K dc {+47}Ar decay. Measured E|g, E|b, I|g, I|b, |g|g- and |b|g-coin, and
47K ec T{-1/2} using two Ge detectors and four 1.5-mm thick plastic
47K fc detectors.
47K c The level scheme is tentative as stated by 2004We09. The position of
47K 2c first two excited states and their transitions were known from
47K 3c {+48}Ca({+48}Ca,X|g). 1742|g and 3822|g placed according to
47K 4c coincidence relations. The relatively strong 3718|g is not observed
47K 5c in coincidence with other |g's and, therefore, assumed to deexcite
47K 6c the 3718 state. 2020|g, 3420|g, and 3357|g placed solely on their
47K 7c energies.
47K cB IB$All branching ratios are normalized based on the total decay
47K 2cB strength deduced from intensities of the |g's from {+47}K decay.
47K 3cB (relative I|g(586|g)=147 {I16} and I|g(2013|g)=155 {I15} from {+47}K
47K 4cB decay as measured by 2004We09 without tape movement.)
47K cB LOGFT(A)$2004We09 quote 7.9; which corresponds to incorrectly assumed
47K 2cB first-forbidden unique transition as stated by 2004WeZY.
47K cB LOGFT(B)$Too low for |DJ=2, |D|p=no transition. Feeding considered as
47K 2cB questionable by the evaluators
47K cB IB(D)$Observed {+47}K activity corresponds to the buildup of the
47K 2cB {+47}Ar daughter. Therefore, intensities of the 586|g and 2013|g of
47K 3cB {+47}K represent 79% and 93% of the total {+47}Ar decay flux,
47K 4cB respectively. The total strength of {+47}Ar decay measured in these
47K 5cB |g's is 174 {I13} in the same relative units as given for the {+47}Ar
47K 6cB decay |g's. This value should be compared to the |SI|g(to g.s.), 128
47K 7cB {I3}. Undetected decay to the g.s. is assumed to be responsible for
47K 8cB the rest of the decay strength, 46 {I13}, which corresponds to a 26%
47K 9cB {I8} decay branching to the g.s.
47K cG M$From the Adopted Gammas.
47K cG E(D)$Placement based on {+48}Ca({+48}Ca,X|g) study (2001Br35)
47K cG E(A)$Transition not observed in neutron-converter spectrum.
47K cG E(E)$Placement based on observed coincidences
47K cG E(G)$Tentative placement based on the energy
47K cL E$From least-squares fit to E|g's assuming |DE(|g)=1 keV (evaluators)
47K cL J,T$From the Adopted Levels.
47K DG CC$FROM BrIcc v2.3e (17-Jun-2020) 2008Ki07, "Frozen Orbitals" appr.
47K DB EAV,LOGFT$FROM BetaShape v2.3.1 (Dec-2023) 2023MO21.
47AR P 0.0 (3/2)- 1.23 S 3 10344.7 18
47AR cP E,J,T$From the Adopted Levels for {+47}Ar.
47AR cP QP$From 2021Wa16
47K N 0.61 7 1 1
47K cN NR$From |SI(|g+ce)(to g.s.)=74 {I8}
47K cN BR$%|b{+-}n<0.2 (2004We09)
47K PN 3
47K G 3207 3 1
47K F G FLAG=A
47K G 3316 1 1
47K G 4010 3 1
47K L 0.0 1/2+ 17.38 S 3
47K 2 L %B-=100
47K B 26 8 6.04 13
47K F B FLAG=AD
47K S B EAV=4877.9 9
47K L 360.0 10 3/2+ 1.1 NS 3
47K G 360 100 [M1,E2] 0.00116 C
47K F G FLAG=DA
47K S G KC=1.0E-3 6$LC=9.E-5 5$MC=1.0E-5 5$NC=3.5E-7 19
47K cG E$Transition contaminated in the neutron-converter spectrum by 359
47K 2cG and 362 |g's in {+94}Kr and {+141}Xe, respectively.
47K B 26 5 5.96 8
47K F B FLAG=A
47K S B EAV=4701.5 10
47K L 2020.0 15 (7/2-) 6.3 NS 4
47K G 1660 53 5 (M2) 9.12E-513 C
47K F G FLAG=DA
47K S G KC=3.70E-5 5$LC=3.10E-6 4$MC=3.37E-7 5$NC=1.242E-8 17
47K G 2020 7 1 [E3] 2.06E-43 ?
47K F G FLAG=AG
47K S G KC=2.61E-5 4$LC=2.190E-6 31$MC=2.376E-7 33$NC=8.76E-9 12
47K B 8 6 8.33 33 ?
47K F B FLAG=AB
47K S B EAV=3891.3 11
47K L 3717.6 7 (3/2,1/2) ?
47K G 3357 1 1 ?
47K F G FLAG=G
47K G 3718 14 2 ?
47K F G FLAG=A
47K cG E$Relatively strong |g not in coincidence with any other |g.
47K B 9 2 5.59 10 ?
47K S B EAV=3057.6 9
47K L 3762.1 18 (3/2,5/2-)
47K G 1742 41 4 C
47K F G FLAG=AE
47K G 3402 4 2 ?
47K F G FLAG=AG
47K B 27 3 5.097 49
47K S B EAV=3035.8 12
47K L 5842.4 18 (3/2,5/2-)
47K G 3822 6 1 C
47K F G FLAG=AE
47K B 4 1 5.17 11
47K S B EAV=2021.4 12