Structure of [superscript 33]Mg sheds new light on the N = 20 island of inversion

Kanungo, Rituparna; Nociforo, C.; Prochazka, A.; Utsuno, Y.; Aumann, T.; Boutin, D.; Cortina-Gil, D.; Davids, B.; Diakaki, M.; Farinon, F.; Perro, C.

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Structure of [superscript 33]Mg sheds new light on the N = 20 island of inversion

Kanungo, Rituparna; Nociforo, C.; Prochazka, A.; Utsuno, Y.; Aumann, T.; Boutin, D.; Cortina-Gil, D.; Davids, B.; Diakaki, M.; Farinon, F.; Perro, C.

Date: 2010

Type: Text

ISSN: 0370-2693

Source:

Physics Letters B 685, 253-257. (2010)

Abstract:

The first reaction spectroscopy on the ground state structure of [superscript 33]Mg through the measurement of the longitudinal momentum distribution from the one-neutron removal reaction using a C target at 898A MeV is reported. The experiment was performed at the FRS, GSI. The distribution has a relatively narrow width (150 [plus or minus] 3 MeV/c (FWHM)) and the one-neutron removal cross-section is 74 [plus or minus] 4 mb. An increased contribution from the 2p[subscript 3/2] orbital is required to explain the observation showing its lowering compared to existing model predictions. This provides new information regarding the configuration of [superscript 33]Mg and the island of inversion.