Coulomb Dissociation of 26Ne

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Presentation transcript:

Coulomb Dissociation of 26Ne Nakamura-laboratory Kazuhiro Ishikawa 02M01020

Contents Motivation Introduction Experimental Setup Data Analysis Results and Discussions Conclusion

Motivation Search for the Soft Dipole Resonance (SDR) in 26Ne Coulomb Dissociation Nuclear Breakup Breakup Develop a method to distinguish two components

Introduction RIPS

Neutron-rich nuclei

Giant Dipole Resonance (GDR) versus Soft Dipole Resonance (SDR) stable nuclei E1 strength is almost exhausted by Giant Dipole Resonance (GDR). Ex=80A-1/3 MeV（～20 MeV 20Ne) unstable nuclei low lying E1 strength Soft Dipole Resonance (SDR) Prediction Low Ex（　8 MeV 26Ne)

In the case of 26Ne

Experimental Method Coulomb Dissociation Using High Z target Experimental Method Coulomb Dissociation Calculated by equivalent photon method Cross section = photon number × B(E1)

Experimental Setup DALI

Experimental Setup Reaction Target Pb: Coulomb Dissociation Al : Nuclear Breakup

Data Analysis Silicon Strip Detector

Particle Identification Upstream of the Target Pulse Height versus TOF ΔE～Z2/v2=Z2TOF2

Particle Identification Downstream of the Target ΔE=ΔEX＋ΔEY Ekin=E+ΔE ΔE=Z2/v2 EkinΔE～AZ2 A: mass Z: charge Ekin=Av2/2

Mass Spectrum of Ne Fragments AZ2～ΔEE’kin=ΔE(E+ΔE/2)b (Z=10) b=0.75 Removal of beam contaminants Selecting of Angle(1~6 degree) Neutron Tagged Select specific mass　 Reaction Cross Section Angular Distribution

Results and Discussions Neutron Counter

Reaction Cross Section Cross Section (mb) Pb Run 26Ne+pb 26Ne+Al 25Ne 119(2) 10(0.3) 24Ne 211(3) 29(0.6) 23Ne 167(3) 22(0.5) 22Ne 197(3) 31(0.7) Al ε：εn~30%

Cross Section Ratio Ratio for 25Ne is high! Coulomb dissociation for 25Ne Hindrance of σ (Al) for 25Ne , 25Ne+Al→24Ne+n+x

Angular Distribution of Ne Fragments Al Pb Wide and Narrow Two components are seen.

Estimation of the width by the fragmentation model AP : Projectile mass AF : Fragment mass EF : Fragment energy From Fermi motion Target Deflection =87 MeV/c =200~300 MeV/c

This result for wide is agreement with Goldhaber model. Al wide＋ Pb wide× Al narrow＊ Pb narrow■ σ⊥(MeV/c) This result for wide is agreement with Goldhaber model. Wide Narrow

Conclusion Electronics

Coulomb dissociation for the 26Ne+Pb→25Ne+n reaction for 25Ne Large Coulomb dissociation for the 26Ne+Pb→25Ne+n reaction Angular distributions Two components (narrow ,wide) wide component : In agreement with fragmentation model (nuclear component) narrow component : Further investigations are necessary (Coulomb component?)

Special thanks to R332n Collaborators Julien GibelinB, Koichi YoshidaE, Takashi NakamuraA, Dider BeaumelB, Nori AoiE, Hidetada BabaD, Yorick BlumefeldB, Zoltan ElekesE, Naoki FukudaE, Tomoko GomiD, Yosuke KondoA, Akito SaitoD, Yositeru SatoA, Eri TakeshitaD, Satoshi TakeuchiE, Takashi TeranisiC, Yasuhiro ToganoD, Victor LimaB, Yoshiyuki YanagisawaE, Attukalathil Mayyan VinodkumarA, Toshiyuki KuboE, Tohru MotobayashiE A: Department of Physics. Tokyo Institute of Technology B: Institut de Physique Nuclaire, Orsay, France C: University of Tokyo (CNS), Riken Campus D: Department of Physics, Rikkyo University E: The Institute of Physics and Chemical Research (Riken) Nakamura-laboratory Takashi Sugimoto, Nobuyuki Matsui, Masako Ohara, Takumi Nakabayashi, Yoshiko Hashimoto