100MeV/u 12 C+ 12 C Scattering at RCNP Weiwei Qu 、 Gaolong Zhang 、 Satoru Terashima 、 Isao Tanihata 、 Chenlei Guo 、 Xiaoyun Le 、 Hoo Jin Ong 、 Harutaka Sakaguchi 、 Yohei Matsuda 、 Inoue Azusa 、 Yassid Ayyad 、 A. Tamii 、 K. Miki

School of Physics and Nuclear Energy Engineering REPORT CONTENT  Introduction  Research Content  Experimental Setup  preliminary data analysis  Summary

School of Physics and Nuclear Energy Engineering Introduction Understanding the interactions between composite nuclei (AA interactions), starting from NN interaction:  One of the fundamental subject in nuclear physics  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.)  Important to survey unknown nuclear structures/reactions of unstable nuclei far from the stability lines.

T. Furumoto, Y. Sakuragi, and Y. Yamamoto, Phys. Rev. C 82 (2010) The optical potential for nucleons is highly dependent on the incident energy, and the depth of the attractive real part become shallower as the energy increases. Finally, the potential changes its sign from negative (attractive) to positive (repulsive).

T. Furumoto, Y. Sakuragi, and Y. Yamamoto, Phys. Rev. C 82 (2010) School of Physics and Nuclear Energy Engineering Decompose the DFM potential into Spin (S) and isospin (T) components V ST ♦ (S,T)=(0,0) and (0,1) do not include the tensor force ♦ (S,T)=(1,0) and (1,1) include the tensor force V 11 has a largest energy dependence. Mainly from two origins: one is the factor (2S+1)(2T+1); another is the tensor force contribution.

School of Physics and Nuclear Energy Engineering 12 C+ 12 C elastic scattering at E/A= MeV real potential change to repulsive at E/A= MeV T. Furumoto, Y. Sakuragi, and Y. Yamamoto, Phys. Rev. C 82 (2010)

School of Physics and Nuclear Energy Engineering Research Content (1) To measure the angular distribution of 100MeV/u 12 C+ 12 C elastic scattering (2) By theoretical analysis try to extract the effect of three- body-force. (3) Other physics

Experiment Setup Beam: 100AMeV 12 C Target: 1.181mg/cm 2 natural C and mg/cm 2 CH 2 target Detector: VDC1 and VDC2, PS1, PS2 and PS3 Measured angles: degrees, Angular resolution: better than 0.1 degree Beam line: WS course Beam intensity: pnA Beam energy resolution:  500keV 100MeV/u 12 C+ 12 ， Osaka University School of Physics and Nuclear Energy EngineeringRCNP Osaka University

“GRAND RAIDEN” 3 m Focal Plane Detector (VDCs+PSs) Magnetic spectrometer VDC1 VDC2 PS1 PS2 PS3 VDC1 and VDC2: particle trajectory PS1,PS2 and PS3: identify particles Two Vertical-type Drift Chambers(VDCs) + Three Plastic scintillators(PSs) (thickness: 3mm,10mm and 10 mm ) Focal plane detectors School of Physics and Nuclear Energy Engineering

GR setting angles: 2.0 , 2.5 , 3.5 , 5.0  and 6.5 

School of Physics and Nuclear Energy Engineering preliminary data analysis We use datadesk to analyze the data. 12 C 10 B

School of Physics and Nuclear Energy Engineering Use kinematics to calculate the Q-value; Separate the Q spectrum into every 0.1 deg. ; Through fitting get the counts of every states.

School of Physics and Nuclear Energy Engineering Cross section calculation Beam intensity Target thickness Solid angle Efficiencies

School of Physics and Nuclear Energy Engineering Cross section in center mass frame

School of Physics and Nuclear Energy Engineering The ratio to mott scattering

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

School of Physics and Nuclear Energy Engineering Physics: (1) Three-body-force (2) Couple channel effect (3) Hoyle state (4) …… summary

School of Physics and Nuclear Energy Engineering Thanks for your attention ！