Bogdanski, M.
PBAR P --> NBAR N
Max results
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Observation of a DIP-Bump Structure in Differential Cross-Section for anti-p + p --> anti-N + n in the 700-MeV/c to 760-MeV/c Momentum Range

Bogdanski, M. ; Emura, T. ; Ganguli, S.N. ; et al.
Phys.Lett.B 62 (1976) 117-120, 1976.
Inspire Record 109019 DOI 10.17182/hepdata.27664

Based on a sample of about 3500 events, we have measured the total and differential cross sections of p p → n n in the 700–760 MeV/ c incident momentum region. It is found that σ CE = 10.7 ± 0.2 mb at the average momentum of 730 MeV/ c . The differential angular distribution is characterised by a sharp peak and a dip in the forward direction followed by a secondary maximum. The position of the dip corresponds to | t | ≈ m π 2 . These results are compared with the predictions of the model of Bryan-Phillips. On the other hand, this dip-bump structure can be well understood on a simple picture involving a π exchange and a constant background (for | t | ≲ 3 m π 2 ).

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Measurement of the anti-p p Charge Exchange Cross-Section Below 1-GeV/c

Alston-Garnjost, M. ; Kenney, R. ; Pollard, D. ; et al.
Phys.Rev.Lett. 35 (1975) 1685, 1975.
Inspire Record 99503 DOI 10.17182/hepdata.21220

No definite evidence for structure is found in the p¯p→n¯n cross section between 276 and 963 MeV/c. From these results limits are deduced on properties of the narrow enhancement reported in the p¯p total cross section at 475 MeV/c.

1 data table
Table 1

No description provided.


The total and differential cross-sections for the reaction anti-p + p ---> anti-n + n at 1.13 gev/c

Colebourne, A. ; Donald, R.A. ; Edwards, D.N. ; et al.
Nucl.Phys.B 70 (1974) 205-214, 1974.
Inspire Record 94753 DOI 10.17182/hepdata.32347

The reaction p ̄ p → n ̄ n has been studied at an incident antiproton laboratory momentum of 1.13 GeV/ c . The antineutron was identified through a subsequent annihilation on a proton. In all, 2601 identified events were obtained. Total and differential cross sections are presented. Comparison is made with the predictions of the Bryan and Phillips model which, in this energy range, is succesful in describing the related reaction p ̄ p → p ̄ p . Here, the agreement is less good.

1 data table
Table 1

No description provided.


Polarization measurement of the anti-p p ---> anti-n n charge exchange at 8 gev/c

Le Du, P. ; Guisan, O. ; Beusch, W. ; et al.
Phys.Lett.B 44 (1973) 390-392, 1973.
Inspire Record 84827 DOI 10.17182/hepdata.28100

The p p → n n polarization has been measured at 8 GeV/ c and for − t values ranging from 0 up to 0.8 (GeV/ c ) 2 . A small and negative polarization has been found.

1 data table
Table 1

ERRORS INCLUDE STATISTICAL AS WELL AS RELATIVELY SMALL SYSTEMATIC EFFECTS.


The charge exchange anti-p p ---> anti-n n at 5.0 and 7.76 gev/c near the forward direction

Lee, J.G. ; Harckham, A. ; Letheren, M. ; et al.
Nucl.Phys.B 52 (1973) 292-300, 1973.
Inspire Record 84235 DOI 10.17182/hepdata.32683

The differential cross section for the charge exchange p p → n n has been measured with high statistics at 7.76 GeV/ c and at 5.0 GeV/ c . The 7.76 GeV/ c data show a very narrow [ Δt ⪅ 0.01 (GeV/ c ) 2 ] forward peak superposed on a slow exponential fall-off.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

INTEGRATED CROSS SECTIONS FROM EXPONENTIAL FIT.


Anti-p p elastic and charge exchange scattering at 230 mev

Kohno, H. ; Kaneko, S. ; Murata, Y. ; et al.
Nucl.Phys.B 41 (1972) 485-492, 1972.
Inspire Record 75157 DOI 10.17182/hepdata.6879

Reactions p p → p p and p p → n n were studied at the kinetic energy 230 MeV of incident p by using bubble chamber films. Total cross sections for both of the reactions were found to be 51.2 ± 1.6 mb and 9.1 ± 0.6 mb, respectively. Differential cross sections are well explained by the phenomenological theory given by Bryan and Phillips.

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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