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Core excitations and narrow states beyond the proton dripline: The exotic nucleus 21Al
Timofeyuk N.K., Fernández-Domínguez B., Descouvemont P., Catford W.N., Delaunay F. et al
Physical Review C 86 (2012) 034305 - http://hal.in2p3.fr/in2p3-00730399
Physique/Physique Nucléaire Expérimentale
Core excitations and narrow states beyond the proton dripline: The exotic nucleus 21Al
N.K. Timofeyuk, B. Fernández-Domínguez, P. Descouvemont, W.N. Catford, F. Delaunay1, J.S. Thomas
1 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
CNRS : UMR6534 – IN2P3 – Université de Caen Basse-Normandie – Ecole Nationale Supérieure d'Ingénieurs de Caen
ENSICAEN - 6, boulevard du Marechal Juin 14050 Caen Cedex
Structure nucléaire
We present the first predictions for the widths of resonance states in a so-far unobserved exotic isotope beyond the proton dripline, 21Al. For this purpose we employ mirror symmetry between the widths of low-lying resonance states and the asymptotic normalization coefficients (ANC) of their mirror analogs. The latter are extracted from a recently measured peripheral reaction 20O(d,p)21O while the positions of resonances are estimated within a microscopic cluster model and a two-body potential model. We have found that 21Al should have two low-lying states decaying into the 20Mg+p channel and three states at higher energy, built on the 2+ core excited state and decaying into the 20Mg(2+)+p channel. The widths of all these states are much smaller than their energies, which makes experimental spectroscopic studies of this isotope beyond the proton dripline possible.

Articles dans des revues avec comité de lecture
Physical Review C (Phys. Rev. C)
Publisher American Physical Society
ISSN 0556-2813 (eISSN : 1089-490X)

21.10.Jx, 21.60.Gx, 23.50.+z, 27.30.+t