$p$-$sd$ shell gap reduction in neutron-rich systems and cross-shell excitations in $^{20}$O

Details $p$-$sd$ shell gap reduction in neutron-rich systems and cross-shell excitations in $^{20}$O $p$-$sd$ shell gap reduction in neutron-rich systems and cross-shell excitations in $^{20}$O

2004-12-13

arxiv.org/abs/nucl-ex/0412028v1

Phys.Rev.Lett. 94 (2005) 132501

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevLett.94.132501

Excited states in $^{20}$O were populated in the reaction $^{10}$Be($^{14}$C,$\alpha$) at Florida State University. Charged particles were detected with a particle telescope consisting of 4 annularly segmented Si surface barrier detectors and $\gamma$ radiation was detected with the FSU $\gamma$ detector array. Five new states were observed below 6 MeV from the $\alpha$-$\gamma$ and $\alpha$-$\gamma$-$\gamma$ coincidence data. Shell model calculations suggest that most of the newly observed states are core-excited 1p-1h excitations across the $N = Z = 8$ shell gap. Comparisons between experimental data and calculations for the neutron-rich O and F isotopes imply a steady reduction of the $p$-$sd$ shell gap as neutrons are added.

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