Reaction cross sections of unstable nuclei Contents • What is reaction cross section (R )? • R Effective matter density distri butions of unstable nuclei • How to measure R . RIBLL in IMP, RIPS in RIKEN • Recent results in 14-18 C isotopes • Summary A. Ozawa (University of Tsukuba)
Reaction cross sections of unstable nuclei. A. Ozawa (University of Tsukuba). Contents What is reaction cross section ( s R )? s R Effective matter density distributions of unstable nuclei How to measure s R . RIBLL in IMP , RIPS in RIKEN Recent results in 14-18 C isotopes Summary. - PowerPoint PPT Presentation
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Reaction cross sections of unstable nuclei
Contents• What is reaction cross section (R)?
• R Effective matter density distributions of unstable nuclei
• How to measure R.
RIBLL in IMP, RIPS in RIKEN• Recent results in 14-18C isotopes• Summary
A. Ozawa (University of Tsukuba)
Density distributions (Density distributions ( ) of stable ) of stable nucleinuclei
• R A1/3
• Neutron radii ≈ proton radii even for 48Ca, 208Pb
• Diffuseness is constant. a ~ 0.6 fm
How are unstable nuclei?
No thick neutron skin!r
ProtonNeutron
Text book says……
Same radii for mirror pairs
How to deduce of unstable nuclei• Proton elastic scattering at ~400 MeVTested for stable nuclei R&D for unstable nuclei
• Electron scatteringCharge distribution can be deduced. R&D for unstable nuclei (SCRIT in RIBF etc. ) • Reaction cross section (interaction cross section) with different energiesAlready applied to unstable nuclei
(11Be: M. Fukuda et al., Phys. Lett. B 268 (1991) 339. )
(H. Sakaguchi et al., PRC57(98)1749)
Interaction cross-section (Interaction cross-section (II) and rea) and reaction cross section (ction cross section (RR))
• Definition of interaction cross-section (I);
Cross section for the change of Z and/or N in incident nucleus
• Reaction cross-section (R)
R = I + inela, inela: inelastic cross-section
If inela is small enough, R ≈ I. At relativistic energy (~1 A GeV)
Glauber model Optical Limit approximatioGlauber model Optical Limit approximationn