| 1. |
- Kuboki, T.a, et al.
(författare)
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Measurement of interaction cross-sections for neutron-rich Na isotopes
- 2011
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Ingår i: Acta Physica Polonica B. - : Jagellonian University. - 0587-4254 .- 1509-5770. ; 42:3-4, s. 765-768
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Tidskriftsartikel (refereegranskat)abstract
- The interaction cross-sections (σI) of neutron-rich Na isotopes, 23-35Na, on C target have been measured at 250A MeV using the RI beam factory (RIBF) at RIKEN. Mass dependence of σI for 27-35Na suggests monotonic growth of the skin thickness. The root-mean-square nuclear matter radii (rm) of 23-35Na were deduced from observed σI via a Glauber-type calculation. These rm are in a good agreement with the theoretical prediction by relativistic mean field model (RMF). rm of 33-35Na were determined for the first time.
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| 2. |
- Takechi, M., et al.
(författare)
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Interaction cross sections for Ne isotopes towards the island of inversion and halo structures of 29Ne and 31Ne
- 2012
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Ingår i: Physics Letters B. - Elsevier : Elsevier BV. - 0370-2693 .- 1873-2445. ; 707:3-€“4, s. 357-361
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Tidskriftsartikel (refereegranskat)abstract
- Interaction cross sections (σI) for Ne isotopes from the stability line to the vicinity of the neutron dripline have been measured at around 240 MeV/nucleon using BigRIPS at RIBF, RIKEN. The σI for 27–32Ne in every case exceed the systematic mass-number dependence of σI for stable nuclei, which can be explained by considering the nuclear deformation. In particular the σI for 29Ne and 31Ne are significantly greater than those of their neighboring nuclides. These enhancements of σI for 29Ne and 31Ne cannot be explained by a single-particle model calculation under the assumption that the valence neutron of 29Ne (31Ne) occupies the 0d3/2 (0f7/2 ) orbital, as expected from the standard spherical shell ordering. The present data suggest an s dominant halo structure of 29Ne and s- or p-orbital halo in 31Ne.
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| 3. |
- Ozawa, A., et al.
(författare)
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Charge-changing cross sections of 30Ne, 32,33Na with a proton target
- 2014
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Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 89, s. 044602-1-044602-5
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Tidskriftsartikel (refereegranskat)abstract
- The total charge-changing, charge pick-up, and partial charge-changing cross sections of very neutron-rich nuclei (30Ne, 32,33Na) with a proton target have been measured at ~240A MeV for the first time. We introduced the phenomenological correction factor in Glauber-model calculations for the total charge-changing cross sections with the proton target, and applied it to deduce the proton radii of these nuclei. For 30Ne and 32Na, the neutron skin thicknesses of the nuclei were deduced by comparing the proton radii with the matter radii deduced from the interaction cross-section measurements. A significant thick neutron-skin has been observed for the nuclei. We also found that the charge pick-up cross sections are much larger than those in the systematics of stable nuclei.
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| 4. |
- Moriguchi, T., et al.
(författare)
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Density distribution of 14Be from reaction cross-section measurements
- 2014
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Ingår i: Nuclear Physics A. - : Elsevier BV. - 0375-9474 .- 1873-1554. ; 929:0, s. 83-93
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Tidskriftsartikel (refereegranskat)abstract
- Abstract We measured the reaction cross sections of the two-neutron halo nucleus 14Be with proton and carbon targets at about 41 and 76 MeV/nucleon. Based on a Glauber model calculation, we deduced the matter density distribution of 14Be in which previously measured interaction cross sections at relativistic energies were also included. An s-wave dominance in 14Be has been confirmed, although the halo tail of 14Be is not distributed as much as that of 11Li. Significant mixing of the p-wave in addition to the s- and d-wave is also suggested.
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| 5. |
- Moriguchi, T., et al.
(författare)
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Density distributions of 11Li deduced from reaction cross-section measurements
- 2013
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Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 88:2, s. 024610-1-024610-7
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Tidskriftsartikel (refereegranskat)abstract
- We measured the reaction cross sections of the two-neutron halo nucleus 11Li with solid hydrogen and carbon targets at around 31 and 41 MeV/nucleon. The neutron density distribution of 11Li was deduced for the first time by the Glauber model calculation based on the optical limit approximation. The uncertainty of the matter density of 11Li was improved, compared with earlier measurements. The present root-mean-square radius of the proton distribution agrees with the previous one derived from an optical isotope shift measurement. The present root-mean-square radii reproduce theoretical calculations by the tensor optimized shell model by assuming core excitation. This consistency suggests the possibility that 9Li in 11Li is excited and the disappearance of the N=8 shell gap of 11Li is caused by correlations originating from the nucleon force, such as the tensor and the pairing.
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