ABC effect in double-pionic nuclear fusion and a pn resonance as its possible origin

M. Bashkanov (for the WASA-at-COSY collaboration)

doi:10.1088/1674-1137/34/9/037

Chinese Physics C> 2010, Vol. 34> Issue(9) : 1339-1341 DOI: 10.1088/1674-1137/34/9/037

ABC effect in double-pionic nuclear fusion and a pn resonance as its possible origin

M. Bashkanov (for the WASA-at-COSY collaboration)

Physikalisches Institut, Univ. Tubingen, D-72076 Tubingen, Germany

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Abstract：
A short overview over the ABC phenomenon is given, which is known since 50 years without any satisfactory explanation. On the basis of new exclusive and kinematically complete data obtained with the WASA detector at COSY we show that this phenomenon is linked with a resonant energy dependence in the total cross section of isoscalar double-pionic fusion processes. This resonance structure is connected with the baryon-baryon system, in particular with the pn and ΔΔ systems, however, has a mass, which is 90 MeV below the nominal ΔΔ threshold and a width of only 70 MeV, i.e., five times smaller than expected from a conventional t-channel ΔΔ scenario.

References

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M. Bashkanov (for the WASA-at-COSY collaboration). ABC effect in double-pionic nuclear fusion and a pn resonance as its possible origin[J]. Chinese Physics C, 2010, 34(9): 1339-1341. doi: 10.1088/1674-1137/34/9/037

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Received: 2010-01-26
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沈阳化工大学材料科学与工程学院沈阳 110142

ABC effect in double-pionic nuclear fusion and a pn resonance as its possible origin

Physikalisches Institut, Univ. Tubingen, D-72076 Tubingen, Germany

Received Date: 2010-01-26

Accepted Date: 1900-01-01

Available Online: 2010-09-05

Abstract:

A short overview over the ABC phenomenon is given, which is known since 50 years without any satisfactory explanation. On the basis of new exclusive and kinematically complete data obtained with the WASA detector at COSY we show that this phenomenon is linked with a resonant energy dependence in the total cross section of isoscalar double-pionic fusion processes. This resonance structure is connected with the baryon-baryon system, in particular with the pn and ΔΔ systems, however, has a mass, which is 90 MeV below the nominal ΔΔ threshold and a width of only 70 MeV, i.e., five times smaller than expected from a conventional t-channel ΔΔ scenario.

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ABC effect in double-pionic nuclear fusion and a pn resonance as its possible origin

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