91RU 91RH EC DECAY (1.47 S) 2004DE40 13NDS 201310
91RU H TYP=FUL$AUT=Coral M. Baglin$CIT=NDS 114, 1293 (2013)$CUT=1-Sep-2013$
91RU C 91RH SOURCE produced in the {+58}Ni({+36}Ar{+10+},p2n) reaction;
91RU2C E=235 MeV beam degraded to AP 121 MEV near target center using a set of
91RU3C TA degraders of varying thicknesses in the beam line in order to
91RU4C capitalize on the maximum cross-section of 11 |mb for this reaction
91RU5C channel as calculated by ^HIVAP code. Nuclei recoiling out of the
91RU6C target were stopped and neutralized by 500 mbar of purified Ar gas
91RU7C inside a cell. Reaction products were ionized selectively, according
91RU8c to Z, using two dye lasers tuned to the resonant atomic transitions
91RU9C of RH or RU, thereby enhancing strongly the ionization and subsequent
91RUAC extraction of those nuclei and improving the statistical quality of
91RUBC |g spectra resulting from their decay. The laser-ionized nuclei were
91RUCC guided toward the ^LISOL mass separator by a sextupole ion guide.
91RUDC Measured EG, IG, GG COIN, |b|g (coin), I(|e+|b), isotope ^T{-1/2} with
91RUEC two HPGe detectors arranged in a compact configuration around
91RUFC |b-sensitive plastic |DE detectors that enclosed a tape station.
91RUGC SHELL-MODEL CALCULATIONS (FOR JPI LE 15/2+ AND E<1500).
91RU CE TI 2004DE40 calculated |b-feeding to 91RH GS and excited states
91RU2CE using the 511 keV annihilation line. Since all I(511G) that could
91RU3CE not be associated with |g events visible in the |g-ray spectra were
91RU4CE attributed to GS |b feeding, branching to weakly populated states and
91RU5CE to LEVELS emitting |g-rays outside the 4 MeV |g-energy range may have
91RU6CE been wrongly included in the GS branch, resulting in an underestimate
91RU7CE of branching to some excited states.
91RU CE LOGFT Values should probably be regarded as lower limits; the large
91RU2CE Q VALUE suggests the possibility of significant unobserved feeding
91RU3CE to highly excited states whose deexcitation may reduce the intensity
91RU4CE imbalance at lower-lying levels; the possible presence of G-RAYS
91RU5CE with EG outside the 4-MEV experimental energy window further increases
91RU6CE the uncertainty in deduced intensity imbalances. See ALSO THE COMMENT
91RU7CE ON TI. LOGFT VALUES ASSUME AN UNCERTAINTY OF 400 IN Q FROM SYSTEMATICS.
91RU CL J FROM Adopted Levels.
91RH P 0.0 (9/2+) 1.47 S 22 9440 SY
91RH CP QP 9440 400 FROM SYSTEMATICS (2012WA38).
91RH CP J A GS JPI=9/2+ is favored by systematics and
91RH2CP is tentatively adopted by 2004De40. Such an assignment is
91RH3CP consistent with |b feedings to levels in 91RU.
91RH CP T measured using a macrocycle of
91RH2CP beam-on followed by a beam-off period with on/off times chosen to
91RH3CP suit the expected half-life of the isotope studied. A time-to-digital
91RH4CP converter was started at the beginning of each macrocycle,
91RH5CP recording the time of each triggered event relative to the start.
91RH6CP Except for the 533G, half-lives based on the time
91RH7CP behavior of each G were determined. The
91RH8CP half-life assigned to 91RH ground-state decay is the weighted
91RH9CP average of the values for the 890G and 973G, 1.40 S 33 and
91RHACP 1.52 s 29, respectively.
91RU N 0.080 17 1
91RU CN NR FROM TI(890G+973G)=9.0 14; CONSISTENT WITH 0.12 7
91RU2CN ASSUMING SUMOF (TI TO GS)=100-IE(GS)=14 8.
91RU PN 3
91RU G 387.4 2 351 39
91RU CG E This transition, with half-life of 1.46 S 11,
91RU2CG is not seen in the |b-gated spectra of 2004De40,
91RU3CG with or without lasers. It is, however, a strong line in the singles
91RU4CG spectra, but only when the lasers are tuned to Rh. The authors
91RU5CG conclude that this is evidence of an isomeric transition in either
91RU6CG 91RH or 91RU, the former being fed directly in the heavy-ion
91RU7CG reaction or the latter being populated through the decay of 91RH.
91RU G 437.7 1 100
91RU G 533.3 1 21 10
91RU G 821.1 1 63 9
91RU L 0.0 (9/2+) 8.0 S 4
91RU CL T WEIGHTED AVERAGE OF 9 S 1 from activity (1983Ko43) AND
91RU2CL 7.85 S 40 FROM 394G(T) (2004DE40)
91RU E 85 8 0.50 9 4.64 13 86 8
91RUS E EAV=3.98E3 20$CK=0.0051 8$CL=0.00062 10$CM+=0.000145 23
91RU CE IB FROM IE=78 TO 94 (2004DE40); 91 2 FROM INTENSITY BALANCE,.
91RU L 889.80 20 (11/2+)
91RU E 4 1 0.03 1 5.74 17 4 1
91RUS E EAV=3.54E3 20$CK=0.0070 13$CL=0.00086 15$CM+=0.00020 4
91RU CE TI CONSISTENT WITH 4.2 13 FROM INTENSITY BALANCE.
91RU G 889.8 2 52 11
91RU CG E placement from 'to be published' work of C. Rusu et
91RU2CG al. (reference 26 in 2004De40); THAT WORK IS STILL UNPUBLISHED,
91RU3CG BUT PLACEMENT IS CONFIRMED IN (36AR,2PNG): E=111 MEV (2013ZH10).
91RU L 973.11 10 (13/2+)
91RU E 5 1 0.04 1 5.63 16 5 1
91RUS E EAV=3.50E3 20$CK=0.0073 13$CL=0.00089 16$CM+=0.00021 4
91RU CE TI CONSISTENT WITH 4.9 14 FROM INTENSITY BALANCE.
91RU CE LOGFT the value is unrealistically lower than expectation for a
91RU2CE DJ=2, DPI=no transition.
91RU G 973.1 1 61 11 E2
91RUS G CC=0.000941 14$KC=0.000825 12$LC=9.55E-5 14$MC=1.750E-5 25$NC+=2.97E-6
91RUS G NC=2.82E-6 4$OC=1.467E-7 21
91RU CG E placement taken by 2004De40 from the literature.
91RU CG M FROM Adopted Gammas.