αDecay of Neutron-Deficient Odd Bi Nuclei: Shell-Model Intruder States in Tl and Bi Isotopes

Internal decay of the(10−)intruder state inTl184

“…The α decay of bismuth towards thallium is crossing the Z = 82 closed shell and in principle only hindered α decay is expected as the proton configurations are very different. However, allowed α decay is observed and this was used to characterize proton intruder states in the bismuth mother and thallium daughter, see [7,8,33] (and references therein). In Fig.…”

Decay of201–203Raand200–202Fr

“…The spin of the ground and isomeric state in 189 Pb were determined unambiguously as 3/2 and 13/2, respectively, by in-source laser spectroscopy at the on-line isotope mass separator ISOLDE at the European Organization for Nuclear Research (CERN) in Switzerland [29]. In that study the 13/2 + isomeric level was located at 40 (4) …”

“…It has been proposed that the ground state for most of the neutron-deficient odd-A bismuth (Z = 83) and astatine (Z = 85) isotopes is related to a πh 9/2 spherical configuration (e.g., Refs. [4,5]). It has also been suggested that this ground state coexists with states related to a proton excitation to the i 13/2 orbital or a proton hole in the s 1/2 orbital, giving rise to an oblate deformation (e.g., Ref.…”

Atomic mass measurements of short-lived nuclides around the doubly-magic 208Pb

“…In case no direct experimental data existed, previous mass values were obtained by a combination of up to four Q α links with results from mass spectrometry. For example, the α-decay of neutron-deficient bismuth was studied at the LISOL facility for odd [15] and even isotopes [16]. All direct data being available in this region are either ISOLTRAP measurements [13,17,18] or mass determinations by the Schottky technique at the Experimental Storage Ring ESR [19,20,21].…”