Allowed spin-flip beta decays in medium-heavy (147 ≤ A ≤ 190) nuclei

Extended selection rules for allowed beta decays in actinides

“…N=n3+A=5, 0 =A+ -', Q"=A The same single-particle spin-Hip transition was found [4,5] to populate one-, two-, three-, or four-quasiparticle states in the daughter nuclei in all known beta decays with logft & 5.2. It may be noted that we use "spin-flip" notation to denote a change in the asymptotic quantum number X as seen in Eq.…”

“…It may be noted that we use "spin-flip" notation to denote a change in the asymptotic quantum number X as seen in Eq. (4) above.…”

“…Our recent exhaustive survey [4] of allowed spin-flip decays (ASFD) identified 122 cases with logft & 5.2 over the mass region 147~A~190. For the deformed nuclei, the asymptotic quantum numbers in all such cases were defined as follows:…”

Band structure in the neutron-rich lanthanide nucleusNd152. I. Anomalous properties of theHellström1, Fogelberg2, Mach3 et al. 1992Phys. Rev. C9080View full textAdd to dashboardCite

“…These include the degree of octupole collectivity in the low-lying negative-parity states [5], and the issue of static octupole deformation near ' sBa [6]. Furthermore, several even-even nuclei also show "extra" low-lying 0+ states [7] which defy description within the IBA and some other collective models.…”

Allowed-unhindered β decay ofYb180and the nuclear structure ofLuMeißner1, Hild2, Kunze3 et al. 1995Phys. Rev. C2000View full textAdd to dashboardCite

“…The strongest P branch of about 37% was the one populating the 982 keV state . Since mass formulas predict a Qp value of 2 MeV for Yb [20], this branch has a log ft value as low as 4.5, a unique signature for an allowed-unhindered P decay [21,22]. In this case, the under lying transition is unambiguously identified: One neutron of the coupled 7/2 [5 1 4] …”