1. Nuclear structure through dynamics and correlations
Martin Freer, University of Birmingham

2. Nuclei from first principles

3. Nuclei from first principles
What is the nature of the proton?
How does the proton get its spin?
99% of mass can be attributed to the
strong interaction and not the Higgs mechanism

4. Nuclei from first principles
Can we understand the nuclear force?

5. Chiral EFT
on the lattice

7. 12C (and the Hoyle-state)
Fred Hoyle
F. Hoyle, D. N. F. Dunbar, W. A. Wenzel, Phys. Rev. 92, 1095 (1953) .
C. W. Cook, W. A. Fowler, T. Lauritsen, Phys. Rev. 107, 508 (1957) 0+

8. Carbon-12
l=1 3- 4- 5- 4+ 0+ 2+ 4+ 2+ K J 0+

9. Carbon-12 3- 4- 5- 4+ 0+ 2+ 4+ 2+ 0+

10. Evidence for a 2+ excitation of the Hoyle-state
Zimmerman, et al. PRL

11. 12C(gamma,3α) 2+
12C(4He,4He’)12C
Freer, et al. PRC

12. 12C(α,α’)3α 4+ 4+ 2+
12C(4He,4He’)12C

13. O. S. Kirsebom, et al
Phys. Rev. C 81, (2010)

14. What about the 5- ? 12C(a,3a) a 3- 0+ 4+ 5- D. J. Marín-Lámbarri
Phys. Rev. Lett. 113, (2014)

15. 5- 3- 2+ 0+

16. Hoyle state structure? α-condensate / α-gas 8Be + α configuration
Antisymmetrized Molecular Dynamics
Fermionic Molecular Dynamics
“Bent arm”
Ab initio lattice calculations
Linear chain
Alpha cluster model
Skyrme model
α-condensate / α-gas
THSR wave function
Calculated direct decay vs sequential BR = 0.06%

17. Experimental Set-up
Decay particles striking separate DSSDs gives a lower background
Events where 2 particles hit the same DSSD were also considered α α α α

18. Break-up channel identification
ε ≈ 0.5
ε ≈ ?

19. The Dalitz Plot Sequentialε3
ε1 + ε2 + ε3 = 1
P1 + P2 + P3 = 0
ε1 ≈ 0.5
ε2 ≈ 0.5
ε3 ≈ 0.5 ε1 ε2

20. The Dalitz Plot Direct ε3
BEC
ε1 + ε2 + ε3 = 1
P1 + P2 + P3 = 0 ε1 ε2

21. 2.4 × 104 events

22. Fitted projected Dalitz plots
0% BR
0.05% BR
0.1% BR
BR < 0.047% (95% C.L.)

23. Predictions: 16O

24. 28Si 16O beam at 10, 17.5, 25 AMeV 12C target
28Si* decays and populates series of states in daughter nuclei
FARCOS
CHIMERA
For more information talk to Jack Bishop.

25. Alpha multiplicity