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Bing Guo For nuclear astrophysics group China Institute of Atomic Energy

(p, g ) reaction via transfer reaction of mirror nuclei and direct measurement of 11 C(p, g ) 12 N at DRAGON. Bing Guo For nuclear astrophysics group China Institute of Atomic Energy The Sixth China Japan Joint Nuclear Physics Symposium May, 2006. Content.

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Bing Guo For nuclear astrophysics group China Institute of Atomic Energy

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  1. (p,g) reaction via transfer reaction of mirror nuclei and direct measurement of 11C(p,g)12N at DRAGON Bing Guo For nuclear astrophysics group China Institute of Atomic Energy The Sixth China Japan Joint Nuclear Physics Symposium May, 2006

  2. Content • (p,g) reaction via transfer reaction of mirror nuclei. 1. Mirror symmetry 2. 8Li(d,p)9Li and 8B(p,g)9C 3. 26Mg(d,p)27Mg and 26Si(p,g)27P • Direct measurement of 11C(p,g)12N at DRAGON.

  3. DWBAanalysis Charge symmetry Radiative capture theory Mirror symmetry If Aand C, Band Dare mirror nuclei, then A(d,p)Bangular distribution Neutron ANC of virtual decay B→ A + n Proton ANC of virtual decay D→ C + p and proton width Astrophysical S-factor and rate of the C(p,g)D reaction

  4. Neutron ANC from A(d,p)B is the ANC of d → p + n. is the ANC of B → A + n. L. D. Blokhintsev et al., Sov. J. Part. Nucl. 8, 485 (1977).

  5. Proton ANC and width of mirror nucleus D BACK N. Timofeyuk et al., PRL. 91, 232501 (2003).

  6. 8Li(d,p)9Li and 8B(p,g)9C Motivation: 8Li(d,p)9Liis one of important reactions in theinhomogeneous big bang models*, can serve as a surrogate reaction to extract the 8B(p,g)9C and 8Li(n,g)9Li reaction rates for the direct capture. *T. Kajino and R. N. Boyd, Astrophys. J. 359, 267 (1990).

  7. Dipole Gas target Quadrupoles Wien Filter MCP1 Reaction Chamber MCP2 Secondary beam facility X. Bai et al., NPA 588, 273c (1995). W. Liu et al., NIM B204, 62 (2003).

  8. Experimental setup

  9. 9Liparticle identification

  10. Angular distribution of 8Li(d,p)9Li s=7.9 ± 2.0 mb Z.H. Li, W.P. Liu, X.X. Bai, B. Guo et al., Phys. Rev. C 71, 052801(R) (2005).

  11. 8B(p,g)9C Motivation: • 7Be(p,g)8B(p,g)9C(a,p)12N(b+)12C is one of possible alternative paths to 3a process； • 8B(p,g)9C may play an important role in the evolution of massive stars with very low metallicities. M. Wiescher et al., Astrophys. J. 343, 352 (1989). G.M. Fuller et al., Astrophys. J. 307, 675 (1986).

  12. Current status and our proposal on 8B(p,g)9C • Several theoretical studies; • Proton transfer 8B(d,n)9C reaction by RIKEN; • Coulomb dissociationmeasurement by RIKEN; • Knockout reactions of 9C by Texas A&M Universityand Michigan State University; • Neutron transfer 8Li(d,p)9Lireaction and charge symmetry of mirror nuclei.

  13. 8Li(d,p)9Li is peripheral?

  14. M. Wiescher et al., APJ. 343, 352 (1989). P. Descouvemont, NPA 646, 261 (1999). P. Mohr, PRC 67, 065802 (2003). D. Beaumel et al., PLB 514, 226 (2001). L. Trache et al., PRC 66, 035801 (2002). T. Motobayashi, NPA 719, 65c (2003). J. Enders et al., PRC 67, 064301 (2003). Astrophysical S-factor of 8B(p,g)9C This work presents an independent examination to the existing studies.

  15. 8B(p,g)9Creaction rate BACK B. Guo, Z.H. Li, W.P. Liu et al., Nucl. Phys. A 761, 162 (2005).

  16. 26Si(p,g)27P reaction 26Al 7.4×105 yr 5+ 2+ 1.809 0+ 0 26Mg The 1.809 MeV g-ray is an ideal observable for nova and x-ray burst. J. José et al., Astrophys. J. 520, 347 (1999). O. Koike et al., Astron. Astrophys. 342, 464 (1999).

  17. Current status and our proposal on 26Si(p,g)27P • Several theoretical studies； • Measurement of resonant capture via Coulomb dissociation method by RIKEN； • No measurement of direct capture； • Determination of direct and resonant captures through neutron transfer reaction 26Mg(d,p)27Mg and charge symmetry of mirror nuclei.

  18. Angular distribution of 26Mg(d,p)27Mg

  19. 26Mg(d,p)27Mg is peripheral?

  20. ANCs of 27Mg and 27P 27P

  21. Proton widths for 27P H. Herndl et al., Phys. Rev. C 52, 1078 (1995). J. A. Caggiano et al., Phys. Rev. C 64, 025802 (2001).

  22. Astrophysical S-factor of 26Si(p,g)27P

  23. 26Si(p,g)27Preaction rate B. Guo, Z.H. Li, X.X. Bai et al., Phys. Rev. C 73, 048801 (2006).

  24. More reactions we can do • 6Li(d,p)7Li→ 6Li(p,g)7Be • 7Li(d,p)8Li →7Be(p,g)8B • 11B(d,p)12B →11C(p,g)12N • 12C(d,p)13C →12C(p,g)13N • 13C(d,p)14C →13N(p,g)14O • 14N(d,p)15N →14N(p,g)15O • …… BACK

  25. Direct measurement of 11C(p,g)12N at DRAGON • Alternative way to the 3a process for transforming material from the pp chains to the CNO. • Play an important role in the evolution of Pop Ⅲ stars. • Indirect data have large discrepancies.

  26. Existing indirect results of 11C(p,g)12N

  27. E983@DRAGON proposed by Prof. W.P. Liu

  28. Production of 11C • ISOL approach(500 MeV proton) , successful producing beams such as 8,9,11Li, 21Na. • Some difficulty producing beams of volatile elements such as 11C, 13N, 15O and 19Ne in required intensities (~108/s).

  29. Alternative approach - using 13 MeV proton beam from TR13 Chemical or physical separation Transfer to OLIS Production OLIS ionization ISAC RB

  30. Intensity vs. collection time Beam of 11C were produced successfully. Beam intensity ~6×108ions/s when 11C radioactivity of (1 Ci) produced by the TR13 medical cyclotron.

  31. Conclusions of 11C production • Produce 11C (and other isotopes) without using the 500 MeV p+ beam is possible. • The beam intensity can meet the needs of radiative proton capture study using DRAGON. • The limitation is efficiency of the ion source. M. Trinczek, S. Lapi, B. Guo et al., Can. J. Phys., (in press).

  32. Research Team of Nuclear Astrophysics at CIAE Experiment Xixiang Bai Bing Guo Gang Lian Zhihong Li Weiping Liu Jun Su Youbao Wang Baoxiang Wang Shengquan Yan Sheng Zeng Yongshou Chen Nengchuan Shu Kaisu Wu Theoretical

  33. Thanks！

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