Search for neutron excitations across the N=20 shell gap in Ne25-29

Belleguic, M; Azaiez, F; Dombradi, Z; Sohler, D; Lopez-Jimenez, MJ; Otsuka, Taka; Saint-Laurent, MG; Sorlin, O; Stanoiu, M; Utsuno, Y; Penionzhkevich, YE; Achouri, NL; Angelique, JC; Borcea, C; Bourgeois, C; Daugas, JM; De Oliveira-Santos, F; Dlouhy, Z; Donzaud, C; Duprat, J; Elekes, Z; Grevy, S; Guillemaud-Mueller, D; Leenhardt, S; Lewitowicz, M; Lukyanov, SM; Mittig, W; Porquet, MG; Pougheon, F; Roussel-Chomaz, P; Savajols, H; Sobolev, Y; Stodel, C; Timar, J

doi:10.1103/PhysRevC.72.054316

Search for neutron excitations across the N=20 shell gap in Ne25-29

Author:

Belleguic, M

Azaiez, F ; Dombradi, Z ; Sohler, D ; Lopez-Jimenez, MJ ; Otsuka, Taka ; Saint-Laurent, MG ; Sorlin, O ; Stanoiu, M ; Utsuno, Y ; Penionzhkevich, YE ; Achouri, NL ; Angelique, JC ; Borcea, C ; Bourgeois, C ; Daugas, JM ; De Oliveira-Santos, F ; Dlouhy, Z ; Donzaud, C ; Duprat, J ; Elekes, Z ; Grevy, S ; Guillemaud-Mueller, D ; Leenhardt, S ; Lewitowicz, M ; Lukyanov, SM ; Mittig, W ; Porquet, MG ; Pougheon, F ; Roussel-Chomaz, P ; Savajols, H ; Sobolev, Y ; Stodel, C ; Timar, J

Keywords:

Science & Technology, Physical Sciences, Physics, Nuclear, Physics, RICH NUCLEI, BETA-DECAY, MODEL, GANIL, MASS, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics

Abstract:

Nuclear structure of the neutron rich 25 − 29 Ne nuclei has been investigated through the in-beam γ -ray spectroscopy technique using fragmentation reactions of both stable and radioactive beams. Level schemes have been deduced for these Ne isotopes. In order to examine the importance of intruder fp configurations, they are compared to shell model calculations performed either in the restricted sd or in the larger sdpf valence space. The 25 , 26 Ne and 27 Ne nuclei were found to be in agreement with the sd shell model calculations, whereas 28 Ne exhibits signatures of the intruder fp shell contribution