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A High statistics measurement of the anti-p p ---> anti-n n charge exchange reaction at 875-MeV/c

Lamanna, M. ; Ahmidouch, A. ; Birsa, R. ; et al.
Nucl.Phys.B 434 (1995) 479-502, 1995.
Inspire Record 379991 DOI 10.17182/hepdata.48341

A new measurement of the differential cross section and of the analysing power A 0 n of the charge-exchange reaction p − p → n − n at 875 MeV/ c is presented. The A 0 n data cover the entire angular range and constitute a considerable improvement over previously published data, both in the forward and in the backward hemisphere. The cross-section data cover only the backward region, but are unique at this energy. A careful study of the long-term drifts of the apparatus has allowed to fully exploit the good statistics of the data.

3 data tables
Table 1

Forward hemisphere measurement. Additional systematic error of 4 pct due to target polarization uncertainty.

Table 2

Backward hemisphere measurement. Additional systematic error of 15 pct.

Table 3

Differential cross section in the backward hemisphere. Additional systematic error of 15 pct.


Measurement of the analyzing power and the differential cross-section of the anti-p p charge exchange reaction at LEAR

Birsa, R. ; Bradamante, F. ; Dalla Torre-Colautti, S. ; et al.
Phys.Lett.B 246 (1990) 267-272, 1990.
Inspire Record 296501 DOI 10.17182/hepdata.29676

As part of a programme to study the spin structure of the p p→ n n channel, we have measured the analysing power A 0 n and the differential cross section at an incident antiproton beam momentum of 704 MeV/ c . The analysing power exhibits a remarkable angular dependence, which is poorly reproduced by the existing potential models.

2 data tables
Table 1

No description provided.

Table 2

No description provided.