# Shell Gap Reduction In Exotic N = 17 Nuclei

Abstract : An experimental spectroscopic investigation of some neutron rich Mg and Al isotopes around the shell closure N=20 has been performed. The delayed neutron and $\gamma$ spectra, following the $\beta$-decay of $^{33}$Mg and $^{35}$Al have been measured using the delayed neutron detector array TONNERRE coupled with high efficiency EXOGAM clover detectors, a LEPS detector and eight low-energy neutron detectors. A detailed analysis of such spectra allows one to construct the level schemes of their daughters, $^{32,33)$Al and $^{34,35}$Si. The resulting spectroscopic information will provide stringent tests of large scale shell model calculations including np - nh excitations aimed at the understanding of the structural effects occurring in this region.
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### Citation

A. Obertelli, N. Alamanos, M. Alvarez, F. Auger, R. Dayras, et al.. Shell Gap Reduction In Exotic N = 17 Nuclei. Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR, Sep 2005, Isle of Kos, Greece. pp.177-180, ⟨10.1063/1.2200921⟩. ⟨in2p3-00087146⟩

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