Measurements of interaction cross sections for ^22–35Na isotopes

¹ Graduate School of Science, Niigata University, Niigata 950-2102, Japan
² Gesellschaft für Schwerionenforschung GSI, 64291 Darmstadt, Germany
³ Department of Physics, Tokyo University of Science, Tokyo 278-8510, Japan
⁴ Department of Physics, Osaka University, Osaka 560-0043, Japan
⁵ Department of Physics, Saitama University, Saitama 338-8570, Japan
⁶ Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan
⁷ Research Center for Nuclear Physics RCNP, Osaka 567-0047, Japan
⁸ RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan
⁹ Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
¹⁰ RI Center, Niigata University, Niigata 950-2102, Japan
¹¹ School of Environmental Science and Engineering, Kochi 782-8502, Japan

^a present address: National Institute of Radiological Sciences, Chiba 263-8555, Japan;e-mail: ssuzuki@nirs.go.jp

Published online: 20 March 2014

Abstract

Interaction cross sections (σ_I) for ²²⁻³⁵Na isotopes from the stability line to the vicinity of the neutron drip line have been measured at around 240 MeV/nucleon. The σ_I for ³³⁻³⁵Na 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 β₂ of ²²⁻³¹Na, these enhancement 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 σ_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.