Abstract
Interaction cross sections ( I) for 22 35 Na isotopes from the stability line to the vicinity of the neutron drip line have been measured at around 240 MeV/ nucleon. The I for 33 35 Na were measured for the first time. Enhancement in cross sections is clearly observed from the systematics for stable nuclei, for isotopes with large mass numbers. From the known values of the nuclear-deformation parameters 2 of 22 31 Na, these en- hancement can be mainly ascribed to the nuclear deformation. Large enhancement in heavier isotopes suggest that these nuclei are strongly deformed. The root-mean-square (RMS) nuclear matter radii were deduced from the I by using Glauber-type calculation. Furthermore, a monotonic growth of the neutron-skin thickness has been deduced with increasing neutron number for Na isotopes.
Highlights
IntroductionEPJ Web of Conferences [6, 7]
Experiments were performed by using BigRIPS at RIBF, operated by the RIKEN Nishina Center and the Center for Nuclear Study, University of Tokyo
The beam energies of Na isotopes in the middle of reaction target were around 240 MeV/nucleon
Summary
EPJ Web of Conferences [6, 7] These experimental results confirm that the magic number 20 vanishes in this region. We have measured σI for Ne isotopes including this region, to suggest the neutron-halo structures of 29Ne and 31Ne from the observed enhancement in σI [7]. In the case of Na isotopes, the previous measurement of σI at GSI has been done up to 32Na. In the present work, we have measured σI for 22−35Na, including heavier ones 33−35Na, to study the nuclear structures of Na isotopes located in or beyond the “island of inversion”
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