Angelis, G. De

Aumann, T.

Beceiro-Novo, S.

Bleis, T. Le

Boretzky, K.

Caesar, C.

Carlson, B. V.

Catford, W. N.

Chakraborty, S.

Chartier, M.

Cortina-Gil, D.

Datta, Ushasi

Emling, H.

Ershova, O.

Fernandez, P. Diaz

Fraile, L. M.

Geissel, H.

Gonzalez-Diaz, D.

Johansson, H.

Jonson, B.

Kalantar-Nayestanaki, N.

Kröll, T.

Krücken, R.

Kurcewicz, J.

Langer, C.

Leifels, Y.

Marganiec, J.

Münzenberg, G.

Najafi, A.

Nilsson, T.

Nociforo, C.

Nowacki, F.

Panin, V.

Paschalis, S.

Plag, R.

Poves, A.

Rahaman, A .

Ray, I.

Reifarth, R.

Ricciardi, V.

Rigollet, C.

Rossi, D.

Scheidenberger, C.

Scheit, H.

Simon, H.

Taylor, J.

Togano, Y.

Typel, S.

Volkov, V.

Wagner, A.

Wamers, F.

Weick, H.

Weigand, M.

Winfield, J. S.

Yakorev, D.

Zoric, M.

English

First results are reported on the ground state configurations of the neutron-rich $^{29,30}$Na 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-momentum 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 $^{29}$Na and $^{30}$Na 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 predominant occupation of the valence neutron in the ground state of $^{29}$Na${(3/2^+)}$ and $^{30}$Na${(2^+)}$ 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 as $^{28}$Na$_{gs (1^+)\otimes\nu_{s,d}$ and $^{29}$Na$_{gs}(3/2^+)\otimes\nu_{ s,d}$, 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 $^{30}$Na

ARTS repository - University of Groningen

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

https://pure.rug.nl/ws/files/33048876/1601.04002v1.pdf

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

Abstract

Similar works

Full text

Available Versions

ARTS repository - University of Groningen

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

Abstract

Similar works

Full text

Available Versions

ARTS repository - University of Groningen

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