Abstract
Reaction cross sections ( R) for 24 38 Mg on C targets at the energies of around 240 MeV/ nucleon have been measured precisely at RIBF, RIKEN for the purpose of obtaining the crucial information on the changes of nuclear structure in unstable nuclei, especially around the so-called of region. In the island of inversion region, which includes neutron-rich Ne, Na, and Mg isotopes, the vanishing of the N = 20 magic number for neutrons have been discussed along with nuclear deformation. The present result suggest deformation features of Mg isotopes and shows a large cross section of weakly-bound nucleus 37 Mg, which could be caused by a neutron halo formation.
Highlights
During the past few decades, our knowledge of the features of exotic nuclei have been much enhanced
We measured the σR for Mg isotopes from 24Mg to 38Mg in order to study the changes of nuclear sizes and nuclear structure as the neutron number increases
Is the ratio of the number of noninteracting outgoing particles to the number of incoming particles, Γ0 is the same ratio for an empty-target measurement to correct for nuclear reactions in the detectors, and t denotes the thickness of the reaction target
Summary
During the past few decades, our knowledge of the features of exotic nuclei have been much enhanced. In 1980s, neutron halo structure of neutron drip-line nucleus, which is one of the most notable abnormal features of exotic nuclei, have been found [1]. In so-called island of inversion region which includes neutron-rich Ne, Na, and Mg isotopes, strongly-deformed nuclei have been found despite of their neutron magic number 20 [2]. For the further understanding of the mechanism of those changes in nuclear structure of unstable nuclei, it is important to investigate these changes from the stable nuclei to the neutron drip line systematically. Our experimental approach to achieve this systematic study is that to probe nuclear radius of each nucleus in Mg isotopic chain from stable to the vicinity of neutron drip line on the basis of same experimental and analysis technique. We measured the σR for Mg isotopes from 24Mg to 38Mg in order to study the changes of nuclear sizes and nuclear structure as the neutron number increases
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