Naslov
Coulomb breakup of neutron-rich ^29,30Na isotopes near the island of inversion

Autori
Rahaman, A ; Datta, Ushasi ; Aumann, T ; Beceiro-Novo, S ; Boretzky, K ; Caesar, C ; Carlson, B V ; Catford, W N ; Chakraborty, S ; Chartier, M ; Cortina-Gil, D ; Angelis, G De ; Fernandez, P Diaz ; Emling, H ; Ershova, O ; Fraile, L M ; Geissel, H ; Gonzalez-Diaz, D ; Johansson, H ; Jonson, B ; Kalantar-Nayestanaki, N ; Kröll, T ; Krücken, R ; Kurcewicz, J ; Langer, C ; Bleis, T Le ; Leifels, Y ; Marganiec, J ; Münzenberg, G ; Najafi, M A ; Nilsson, T ; Nociforo, C ; Panin, V ; Paschalis, S ; Plag, R ; Reifarth, R ; Ricciardi, M V ; Rigollet, C ; Rossi, D ; Scheidenberger, C ; Scheit, H ; Simon, H ; Taylor, J T ; Togano, Y ; Typel, S ; Volkov, V ; Wagner, A ; Wamers, F ; Weick, H ; Weigand, M ; Winfield, J S ; Yakorev, D ; Zoric, M

Izvornik
Journal of Physics G: Nuclear and Particle Physics (0954-3899) 44 (2017), 4; 045101-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
neutron-rich nulei, RIB, Coulomb breakup, ground state configuration, spectroscopic factor, island of inversion

Sažetak
First results are reported on the ground state configurations of the neutron-rich 29, 30Na isotopes, obtained via Coulomb dissociation (CD) measurements as a method of the direct probe. The invariant mass spectra of those nuclei have been obtained through measurement of the four-momenta of all decay products after Coulomb excitation on a 208 Pb target at energies of 400-430 MeV/nucleon using FRS-ALADIN-LAND setup at GSI, Darmstadt. Integrated Coulomb-dissociation cross-sections (CD) of 89 (7) mb and 167 (13) mb up to excitation energy of 10 MeV for one neutron removal from 29Na and 30Na respectively, have been extracted. The major part of one neutron removal, CD cross-sections of those nuclei populate core, in its’ ground state. A comparison with the direct breakup model, suggests the pre-dominant occupation of the valence neutron in the ground state of 29Na(3/2+) and 30Na(2+) is the d-orbital with small contribution in the s-orbital which are coupled with ground state of the core. The ground state configurations of these nuclei are 28Na gs(1+)νs, d and 29Na gs(3/2+)νs, d, respectively. The ground state spin and parity of these nuclei, obtained from this experiment are in agreement with earlier reported values. The spectroscopic factors for the valence neutron occupying the s- and d- orbitals for these nuclei in the ground state have been extracted and reported for the first time. A comparison of the experimental findings with the shell model calculation using MCSM suggests a lower limit of around 4.3 MeV of the sd-pf shell gap in 30Na.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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