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Wasa-at-Cosy The ABC Effect in Double-Pionic Nuclear Fusion and a pn Resonance as its Possible Origin.

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Presentation on theme: "Wasa-at-Cosy The ABC Effect in Double-Pionic Nuclear Fusion and a pn Resonance as its Possible Origin."— Presentation transcript:

1 Wasa-at-Cosy The ABC Effect in Double-Pionic Nuclear Fusion and a pn Resonance as its Possible Origin

2 ABC effect Experimentally Theoretically low-mass enhancement in M
observed in many fusion reactions accompanied with ΔΔ excitations Theoretically originates from t-channel ΔΔ excitation expected double-hump structure in M (not supported by experimental observations)

3 What we actually did p n p

4 What we actually did 0 d p 0

5 WASA 4 Detector d COSY/

6 Total xsection pp d+0 pn d+- pn d00 (+0)=(I=1)
(+-)=0.5(I=1)+2(I=0) (00)=(I=0)=0.2(I=1) t - channel 

7 Total x-section preliminary  mass d threshold

8 2D x-section preliminary

9 Qualitative description
Δ d π p n p n Δ d π +

10 Total xsection slices: qualitative description
preliminary

11 Total xsection slices: qualitative description
preliminary

12 Total xsection slices: qualitative description
preliminary

13 Total xsection slices: qualitative description
preliminary

14 Total xsection slices: qualitative description
preliminary

15 Total xsection slices: qualitative description
preliminary

16 Total xsection slices: qualitative description
preliminary

17 Total xsection slices: qualitative description
preliminary

18 Total xsection slices: qualitative description
preliminary

19 Total xsection slices: qualitative description
preliminary

20 Total xsection slices: qualitative description
preliminary

21 Total xsection slices: qualitative description
preliminary

22 Total xsection slices: qualitative description
preliminary

23 Total xsection slices: qualitative description
preliminary

24 Total xsection slices: qualitative description
preliminary

25 Total xsection slices: qualitative description
preliminary

26 Total xsection slices: qualitative description
preliminary

27 Total xsection slices: qualitative description
preliminary

28 Total xsection slices: qualitative description
preliminary

29 Total xsection slices: qualitative description
preliminary

30 Angular distributions
preliminary

31 pn  d00 and pp  d+0 (p-spectator) (n-spectator) preliminary

32 +0 invariant mass Tp  1GeV
pp  2He p0p0 preliminary pp  d p+p0

33 First results on He December 07 (dd  3He/+X)
Measurements Td=0.8, 0.9, 1.05, 1.117, 1.25, 1.32, 1.4 GeV

34 dd  4He p0p0 : Invariant Mass p0p0
1.117 GeV 1.05 GeV 0.9 GeV preliminary

35 Conclusion ABC effect due to narrow s -channel resonance with
ABC resonance: eigenstate in isoscalar pn and  systems can not originate from coherent production on deuteron robust enough to survive in nuclear medium More than just a  state ? Is it a genuine dibaryon? Is it a member of dibaryonic multiplet?

36 Multiplet 1010=35282710 Y()=2  I()=0 * * 
Kim Maltman, Nucl. Phys. A501 (1989) 843

37 Outlook 1.0 GeV ,1.2 GeV ,1.4 GeV – done
Finalization of the data to be done Perform Partial Wave Analysis (JPC) Do we need polarization? Analysis of is on the way Analysis of to be started Measure Measure pn elastic scattering

38  * *  Thank you

39 Total x-section  mass preliminary d threshold

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