2.102-MeV level inHg206and the spin gyromagnetic ratio of the3−sproton

Abstract

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.

Investigation of196,198Pt and202,204Hg with the (d, pn?) reaction

“…Finally, from the observed intensity of the 1172keV 7-~4 + transition we can derive a value of B(E3, 7-~4+)=1.6(5).104 e2fm6=6.5 (19)W.u., which is much higher than the value of B(E3, 5---.2+)=0.18 W.u. observed in 2~ [39], but similar enhancements of E3 transitions have been observed in other nuclei in the 2~ region . It would be very interesting to have further experimental information on the negative parity states in 2~176 in order to trace the transition from the rotation aligned to single particle structure in the even Hg nuclei.…”

“…On the other hand close lying 5-and 7-levels with rather pure two particle configurations are expected for the Hg and Pb nuclei close to 2~ [36,37]. Experimentally the v(p~/lzi~z) 7 -level in 2~ and the rc(s;/lzh{~2) 5-level in 2~ are known at 2,200 and 2,102keV, respectively [38,39]. Thus one expects in 2~ a 5--7-doublet at an excitation energy around 2.2MeV, where the 5-level has the 2~ proton configuration and the 7-level is a mixture of the 2~ neutron configuration and a 7z(d~h~-l}2) excitation.…”

First measurement of the β -decay half-life of 206 Au

“…This letter reports on the investigation of 206 Au, the lightest N = 127 isotone for which β-decay data are presently available. Earlier studies on the daughter nucleus 206 Hg exploited α decay [21], transfer and deepinelastic reactions [22][23][24], and fragmentation of relativistic heavy stable beams [25][26][27]. Here we report, for the first time, the half-life of 206 Au and the observation of a β-decay branch to the J π = 5 − isomer in 206 Hg.…”

Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a208Pb beam

“…These are an I π = 5 − , T 1/2 = 2.15(21) μs state [3][4][5]30] and an I π = (10 + ), T 1/2 = 92(8) ns state [5,30], which has 100% feeding to the lower-lying isomer. Our measured half-lives of T 1/2 = 2.09(2) μs and T 1/2 = 112(4) ns agree with the previously published values.…”