Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2011-01-20
Phys.Rev.C84:021301,2011
Physics
Nuclear Physics
Nuclear Theory
11 pages, 5 figures, version to appear in Phys. Rev. C (Rapid communication)
Scientific paper
10.1103/PhysRevC.84.021301
Shell model calculations using realistic interactions reveal that the ground and low-lying yrast states of the $N=Z$ nucleus $^{92}_{46}$Pd are mainly built upon isoscalar neutron-proton pairs each carrying the maximum angular momentum J=9 allowed by the shell $0g_{9/2}$ which is dominant in this nuclear region. This structure is different from the ones found in the ground and low-lying yrast states of all other even-even nuclei studied so far. The low-lying spectrum of excited states generated by such correlated neutron-proton pairs has two distinctive features: i) the levels are almost equidistant at low energies and ii) the transition probability $I\rightarrow I-2$ is approximately constant and strongly selective. This unique mode is shown to replace normal isovector pairing as the dominating coupling scheme in $N=Z$ nuclei approaching the doubly-magic nucleus $^{100}$Sn.
Bäck Thomas
Blomqvist Janne
Cederwall B.
Johnson Adrian
Liotta Roberto J.
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