Observation of Low-LyingJπ=0+States in the Single-Closed-Shell Nuclei<

Shape coexistence in the light Po isotopes

“…As can be seen from gure 1, the position of the 0 + 2 state shows a very pronounced mass dependence, which seems strongly correlated with the general drop in the energies of the yrast and yrare states below 200 Po. This mass dependence is also strongly reminiscent o f the observed behavior of the intruder 0 + states in the light Pb isotopes, which most probably have a proton two-particle two-hole ((2p-2h)) structure [1,41].…”

Characterization of the low-lying0+and2+states inNi68Flavigny1, Pauwels2, Radulov3 et al. 2015Phys. Rev. CSelf Cite462420View full textAdd to dashboardCite

“…Configurations involving substantial proton excitations from the Z = 28 closed shell represent one of the possible origins for a 0 + excited state. Looking at neighboring odd-mass nuclei, the position of a π (2p-2h) state is estimated using the prescription given in [13] by summing the excitation energies of the possible π (1p-2h) and π (2p-1h) in, respectively ,67 Co [14] and 69 Cu [15,16] which led to 2202 keV [17]. Experimentally, Dijon et al [18] proposed a candidate at this energy for such a highly deformed π (2p-2h) proton intruder state using a multinucleon transfer reaction but no supporting evidence was found for this state in a subsequent study [12].…”

Multifaceted Quadruplet of Low-Lying Spin-Zero States in Ni66 : Emergence of Shape Isomerism in Light Nuclei

“…For an even-even nucleus at spin 0, the lowest PES minimum corresponds to the ground state (g.s. ), while there may exist additional (secondary) minima in which excited 0 þ states can reside: they can be interpreted as ground states of different shapes [2][3][4][5][6]. When a secondary minimum is separated from the main minimum by a high barrier, in the extreme case a long-lived isomer, called shape isomer, can be formed [7].…”