Magic features of 68Ni

Characterization of the low-lying0+and2+states inNi68Flavigny1, Pauwels2, Radulov3 et al. 2015Phys. Rev. C462420View full textAdd to dashboardCite

“…Both the 1139 and the 2421 keV γ lines fit in the level scheme presented in Fig. 4 fixing the energy of the first excited 0 + state at 1603.6(6) keV, well below the earlier value of 1770(30) keV [3]. This repositioning of the second 0 + agrees well with recently published values from an in-beam γ -spectroscopy study and β decay, respectively [4,5].…”

“…In 68 Ni, the first excited state is also a 0 + state at quite low energy and was initially positioned at 1770 (30) keV [3]. Its energy was corrected recently as 1603.5(3) keV in an in-beam γ spectroscopy study producing 68 Ni [4], as 1605(3) keV in a β-decay study [5], and also in the present study as 1603.…”

Low-spin states and the non-observation of a proposed 2202-keV,0+isomer in68Ni

“…Early studies of 68 Ni indicated that it possibly had doubly-magic character, with a closed proton shell at Z = 28 and neutron subshell at N = 40 [1,2]. Subsequent work in the region revealed the transitory nature of the latter shell gap, as the magicity was found not to persist in other N ≈ 40 nuclei [3][4][5][6] and some theoretical efforts such as those in Refs.…”

“…In turn, these developments serve as a basis for descriptions of more neutron-rich nuclei, including 78 Ni and beyond. Prior to this work, ten states below 3.5 MeV had been proposed in 68 Ni [1,2,21,[23][24][25]. Four of the lowest five states have been assigned spin and parity I π = 0 + , including the recently proposed 2p2h isomer [2,21,23].…”

“…Prior to this work, ten states below 3.5 MeV had been proposed in 68 Ni [1,2,21,[23][24][25]. Four of the lowest five states have been assigned spin and parity I π = 0 + , including the recently proposed 2p2h isomer [2,21,23]. Significant experimental uncertainties remain for some of these levels: several have only tentative I π assignments and the energy of the first excited 0 + state is not well known (1770(30) keV [2]).…”