100 Me Vu 12 C12 C scattering Gaolong

100 Me. V/u 12 C+12 C scattering Gaolong Zhang School of Physics and Nuclear Energy Engineering Beihang University E 405 -collaborators

School of Physics and Nuclear Energy Engineering Outline Ø Ø Our motivation Experimental setup Data analysis and preliminary results Summary

School of Physics and Nuclear Energy Engineering Our motivation Understanding the interactions between composite nuclei (AA interactions), starting from NN interaction: Ø One of the fundamental subject in nuclear physics Ø One of the key issue to understand various nuclear reactions: * optical potentials: elastic scattering * distorting potentials as a doorway to various reactions (inelastic, transfer, breakup, etc. ) Ø Important to survey unknown nuclear structures/reactions of unstable nuclei far from the stability lines.

The change of the potential with and without TBF Without 3 -body force With 3 -body force T. Furumoto, Y. Sakuragi, and Y. Yamamoto, Phys. Rev. C 82 (2010) 044612.

T. Furumoto, Y. Sakuragi, and Y. Yamamoto, Phys. Rev. C 82 (2010) 044612. 5

School of Physics and Nuclear Energy Engineering 12 C+12 C elastic scattering at E/A=100 -400 Me. V real potential change to: repulsive at E/A=300 -400 Me. V The energy of the minimum oscillation changes by threebody interactions. TBF no yes T. Furumoto, Y. Sakuragi, and Y. Yamamoto, Phys. Rev. C 82 (2010) 044612.

Brief Introduction Experiment Beam line: WS course RCNP Beam: 100 A Me. V 12 C Beam intensity: 0. 1 -1. 0 pn. A on target Beam energy resolution: 500 ke. V Target: 1. 181 mg/cm 2 natural C 11. 40 mg/cm 2 CH 2 Detector: VDC 1 and VDC 2 PS 1, PS 2 and PS 3 Measured angles: 1 -7. 5 degrees, Angular resolution: better than 0. 1 degree

Magnetic spectrometer “GRAND RAIDEN” 3 m Focal plane detectors Focal Plane Detector (VDCs+PSs) Two Vertical-type Drift Chambers(VDCs) + Three Plastic scintillators(PSs) (thickness: 3 mm 10 mm and 10 mm) VDC 1 and VDC 2: particle trajectory PS 1, PS 2 and PS 3: identify particles VDC 1 VDC 2 PS 1 PS 2 PS 3

School of Physics and Nuclear Energy Engineering GR setting angles: 2. 0 , 2. 5 , 3. 5 , 5. 0 and 6. 5

20 mrad (H) 6 mrad (V) 10

Brief Introduction Data analysis and preliminary results

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School of Physics and Nuclear Energy Engineering Ø Use kinematics to calculate the Q-value; Ø Separate the Q spectrum into every 0. 1 deg. ; Ø Through fitting get the counts of every states.

Cross section calculation Ø Beam intensity Ø Target thickness Ø Solid angle Ø Efficiencies 14

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School of Physics and Nuclear Energy Engineering Use CH 2 target to check our data 12 C+p elastic scattering K. STRAUCH, F. TITUS Phys. Rev. 103(1956) 200

Physics: (1) Three-body-force (2) Couple channel effect (3) Hoyle state (4) …… 19

Collaborators: (1)Beihang University Tanihata Isao, Le Xiaoyun, Terashima Satoru, Wang Taofeng, Sun Baohua, Qu Weiwei and Guo Chenlei (2) RCNP, Osaka University Tanihata Isao, Sakaguchi H, Ong Hooi Jin, Matsuda, Tamii A, Miki K, Yassid Ayyad and. Azusa Inoue (3) IMP, CAS Chen Zhiqiang, Wada R 20

School of Physics and Nuclear Energy Engineering Summary Ø Study an effect of tensor forces and three-body interactions in heavyion reactions by 12 C + 12 C elastic scattering at beam energies from 100 A to 400 A Me. V. Ø The experiment of 100 A Me. V 12 C+12 C elastic scattering has been done at RCNP. Elastic and inelastic parts can be clearly separated. The preliminary results have been obtained. Ø The experimental data will be continued to analyze and give the final results. 21

Thank you for your attention!

M. Takashina et al. , Phys. Rev. C 81, 047605 (2010).

Figure is the calculated by Furumoto et al. (YKIS 2011)