A dependence of the (pi+,pi+ pi+-) reaction near the 2m(pi) threshold

Bonutti, Faustino; Camerini, Paolo; Fragiacomo, Enrico; Grion, N.; Rui, Rinaldo; Amaudruz3, P. A.; Brack3, J. T.; Felawka2, L.; Gibson6, E. F.; Hofman3, G. J.; 4,; Kermani3, M.; 4,; Mathie5, E. L.; McFarland3, S.; 4,; Meier3, R.; Ottewell3, D.; Raywood3, K.; Sevior7, M. E.; Smith3, G. R.; Tacik5, R.

doi:10.1103/PhysRevLett.77.603

The 2H,12C,40Ca,208Pb(π+,π+π±) reactions have been studied at Tπ+ = 282.7 MeV, and the π+π± invariant mass distributions Mπ+π±A measured down to the 2mπ threshold. The Mπ+π-A yield near threshold is close to zero for A = 2, and increases dramatically with increasing A (from 12 to 40 to 208). A phase analysis indicates that the π+π- pairs in this range of Mπ+π-A have J = I = 0. In the case of Mπ+π+A, there is some strength near threshold regardless of A, and the π+π+ pairs have J = 0,I = 2. The experimental results indicate that nuclear matter strongly modifies the ππ interaction in the J = I = 0 channel.

Titolo:	A dependence of the (pi+,pi+ pi+-) reaction near the 2m(pi) threshold
Autori:	BONUTTI, FAUSTINO CAMERINI, Paolo FRAGIACOMO, ENRICO N. Grion RUI, RINALDO P. A. Amaudruz3 J. T. Brack3 L. Felawka2 E. F. Gibson6 G. J. Hofman3 4 M. Kermani3 4 E. L. Mathie5 S. McFarland3 4 R. Meier3 D. Ottewell3 K. Raywood3 M. E. Sevior7 G. R. Smith3 R. Tacik5 mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	1996
Rivista:	PHYSICAL REVIEW LETTERS
Abstract:	The 2H,12C,40Ca,208Pb(π+,π+π±) reactions have been studied at Tπ+ = 282.7 MeV, and the π+π± invariant mass distributions Mπ+π±A measured down to the 2mπ threshold. The Mπ+π-A yield near threshold is close to zero for A = 2, and increases dramatically with increasing A (from 12 to 40 to 208). A phase analysis indicates that the π+π- pairs in this range of Mπ+π-A have J = I = 0. In the case of Mπ+π+A, there is some strength near threshold regardless of A, and the π+π+ pairs have J = 0,I = 2. The experimental results indicate that nuclear matter strongly modifies the ππ interaction in the J = I = 0 channel.
Handle:	http://hdl.handle.net/11368/2559767
Digital Object Identifier (DOI):	http://dx.doi.org/10.1103/PhysRevLett.77.603
Appare nelle tipologie:	1.1 Articolo in Rivista

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