Vandana Tripathi

Excited intruder states in (32)Mg

The low energy level structure of N = 20 32 Mg obtained via β-delayed γ spectroscopy is reported. The level structure of 32 Mg is found to be completely dominated by intruders. An inversion between the 1p-1h and 3p-3h states is observed for the negative parity states, similar to the 0p-0h and 2p-2h inversion for the positive parity states in these N ∼ 20 nuclei. The intruder excited states, both positive and negative parity, are reasonably explained by Monte Carlo shell model calculations, which suggest a shrinking N = 20 shell gap with decreasing Z.

p-sd Shell Gap Reduction in Neutron-Rich Systems and Cross-Shell Excitations in ^2^0O

Excited states in 20O were populated in the reaction 10Be(14C,alpha) at Florida State University (FSU). 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.

Radiative decay of neutron-unbound intruder states in O 19

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29Na: Defining the Edge of the Island of Inversion for Z=11

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Angular momentum and cross sections for fusion with weakly bound nuclei: breakup, a coherent effect

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Intruder configurations in the A=33 isobars: 33Mg and 33Al.

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Competition between normal and intruder states inside the island of inversion

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Beta-delayed gamma spectroscopy of neutron rich 27,28,29Na

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High efficiency beta-decay spectroscopy using a planar germanium double-sided strip detector

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