The quadrupole coupling constant of the n(h~~~2 s~q'2) isomer in polycrystalline Hg at 225 K has . been measured by means of the perturbed angular distribution method. The result is e'Qq/h =136.5+3 MHz, from which we deduce eg =65+13 e fm' and an effective charge e,ff(m.h llg2) =(2.2+0.5)e.
The nuclear gyromagnetic ratio, spin parity, and lifetime of the Hg 2.102-MeV level have been measured to be g=1.09+0.01, J =5, and~=3.1+0.3 @sec, respectively.The level was populated via the~Hg(t, p) Hg reaction. The perturbed angular distribution technique was employed to measure g. Using known data, the spin gyromagnetic ratio for a proton in the 3s orbital has been deduced: g, (m;3s) =3.6+0.3. For the 1.068-MeV level, J =2+.
NUCLEAR REACTIONSHg(t, p), E& --16 MeV. For Hg (E"=2.102 MeV), measured~=3.1+0.3 @sec, g =1.09+0.01, and J =5 . For E"=1. 068 MeV, J =2+. Deduceg(m, '3s)=3.6+0.3.
The nuclear gyromagnetic ratio of the 3291-keV J 17 = ~+ 205 Tl level has been measured with use of y-ray perturbed angular distribution techniques with the result g = 0.544 ± 0.008. The state was populated with the reaction 204 Hg(£>2n ) 205 Tl. With use of the known quantities ^( 206 Pb 7"; E x = 2200 keV) and g( m Bi | + ?E X = 0 keV) the proton orbital magnetic g factor for the lh orbital was deduced to be g t = 1.115± 0.02. This result has been corrected for wave-function admixtures and core polarization effects.An isovector M6 transition is observed for the first time in a (p,n) reaction. A prominent peak was seen at E x = 5.545 ± 0.025 MeV in 24 A1 in the study of the reaction u Mg(p, w) 24 Al at E p = 35 MeV. This state is interpreted as the "stretched" particle-hole state with J n -6", T = 1, which corresponds to the 15.13-MeV state in 24 Mg. Distorted-wave Born approximation analysis gives a result consistent with those for (p ,p') and (e 9 e') reactions, indicating that at least 50% of the isovector M6 strength is missing.
States inBi were populated with the~OSPb(t, 2n) reaction. Incident triton energies between 11 and 16 MeV were used. Gamma-ray excitation functions, angular distributions, and y-y-time coincidence spectra were measured. Approximately 50 newly-observed y rays have been assigned to transitions in Bi. Previously-unresolved doublets at E"=2600, 3135, and 3154 keV have been identified. A new level at 3270 keV is reported, and the 3197-keV level is verified.~0 Bi level energies are reported with an accuracy of 600 eV or less. A level scheme for E"&4.14 MeV is presented, including spin-parity assignments. A S+ 3+ new M1 transition between the 2 and 2 members of the mh9/2(3) 3 septuplet is reported. The 19 levels belonging to the vg9/+]/2 ', mh9/2 are identified.
NUCLEAR REACTIONSPb(t, 2ny) Bi, E, =11 -16 MeV. Measured Ey Iy(8), excitation functions, yet coinc. Deduced levels E, J, core-coupled multiplet structure.
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