Parker, E.F.
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Polarization in pi--p Scattering between 500 and 940 Mev

Beall, E.F. ; Cork, B. ; Murphy, P.G. ; et al.
Phys.Rev. 126 (1962) 1554-1560, 1962.
Inspire Record 944982 DOI 10.17182/hepdata.26812

A graphite-plate spark chamber has been used to analyze the polarization of protons recoiling from π−−p scattering. The observations were made at 90° (c.m. system) pion scattering angle for seven incident pion energies between 500 and 940 Mev, at 120° or 135° for five energies in this interval, and also at 75° for 500 Mev only. The results are compared with predictions of several models used to explain the maxima in the π−−p scattering cross section. Qualitative arguments show that the energy intervals between these maxima are not completely dominated by neighboring single-state resonances. Phase shifts found to be large in scattering also seem to be large in polarization.

10 data tables
Table 1

No description provided.

Table 2

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Table 3

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Photoproduction of $\pi^0$ from Hydrogen near the Second Pion-Nucleon Resonance

DeStaebler, H.C. ; Erickson, E.F. ; Hearn, Anthony C. ; et al.
Phys.Rev. 140 (1965) B336-B348, 1965.
Inspire Record 48749 DOI 10.17182/hepdata.26402

Angular distributions for π0 photoproduction from hydrogen at energies between 660 and 800 MeV and proton center-of-mass angles from 0° to 140° have been measured and analyzed. Some variation from a pure d32 state is seen in the resonance region. A possible high-momentum-transfer enhancement of the cross section is discussed.

13 data tables
Table 1

Axis error includes +- 0.0/0.0 contribution (3 TO 10////).

Table 2

Axis error includes +- 0.0/0.0 contribution (3 TO 10////).

Table 3

Axis error includes +- 0.0/0.0 contribution (3 TO 10////).

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Photoproduction of neutral pions from hydrogen in the region of the first pion-nucleon resonance

Morand, R. ; Erickson, E.F. ; Pahin, J.P. ; et al.
Phys.Rev. 180 (1969) 1299-1307, 1969.
Inspire Record 55450 DOI 10.17182/hepdata.26482

The cross section for single π0 photoproduction from hydrogen has been measured at nominal angles of 70°, 90°, 130°, and 180° for photon energies 220-400 MeV by detecting the recoil protons. The 180° measurements, taken with a new setup, avoid big corrections present in some of the previously published results. These new data allow a direct comparison with the experiment presented by the Bonn group and with the most recent theoretical predictions.

1 data table
Table 1

No description provided.


Neutron-proton and neutron-deuteron total cross-sections at 4.0 and 5.7 gev/c

Parker, E.F. ; Gustafson, H.Richard ; Jones, Lawrence W. ; et al.
Phys.Lett.B 31 (1970) 246-249, 1970.
Inspire Record 63208 DOI 10.17182/hepdata.6170

The np and nd total cross sections have been measured directly with a neutron beam with momenta of 4.0 ± 0.6 and 5.7 ± 0.6 GeV/ c . The data are compared with the previous nucleon-nucleon and nucleon-deuteron results, and the deuteron screening term was also evaluated. The measured total cross section are 43.1 ± 0.6 and 80.3 ± 1.9 mb at 4.0 GeV/ c and 42 ± 0.6 and 77.8 ± 1.3 mb at 5.7 GeV/ c .

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Photoproduction of positive pions at 180 degrees from 0.22 to 3.1 gev

Bouquet, B. ; D' Almagne, B. ; Eschstruth, P.T. ; et al.
Phys.Rev.Lett. 27 (1971) 1244-1247, 1971.
Inspire Record 68896 DOI 10.17182/hepdata.21483

The π+ photoproduction cross section in hydrogen has been measured at 180° for photon energies from 0.22 to 3.1 GeV by detecting the pion in the backward direction. The statistical accuracy of the measurements varies typically from 3 to 10% depending on the energy. The data are compared with other recent experimental results and predictions of phenomenological theories.

1 data table
Table 1

No description provided.


Measurement of sigma(tot) in proton proton scattering in pure spin states

Parker, E.F. ; Ratner, L.G. ; Brown, B.C. ; et al.
Phys.Rev.Lett. 31 (1973) 783-786, 1973.
Inspire Record 83779 DOI 10.17182/hepdata.21350

An experiment was done using the new accelerated polarized proton beam at the Argonne National Laboratory zero-gradient synchrotron and a polarized proton target. The total cross section for proton-proton scattering at 3.5 GeV/c was measured in the spin states ↑↑ and ↑↓ perpendicular to the beam direction. The two cross sections were found to be equal within the experimental error of ±5%.

1 data table
Table 1

TOTAL CROSS SECTION DIFFERENCE FOR PURE TRANSVERSE SPIN STATES.


A formation study of n anti-n interactions between 1.09 and 3.45 gev/c. (iv)-features of annihilations into k anti-k and pi mesons

Oh, B.Y. ; Eastman, P.S. ; Ming, Ma.Z. ; et al.
Nucl.Phys.B 63 (1973) 1-27, 1973.
Inspire Record 83880 DOI 10.17182/hepdata.32487

Final state resonance production and single particle momentum spectra are presented for p p annihilations into K K and π's between 1.09 and 3.45 GeV/ c . Resonance production generally agrees with the Lamb statistical model. Momentum spectra of K's and π's are independent of incident energy, while the mean multiplicity increases in proportion to the c.m. energy, supporting the annihilation model of Jacob and Nussinov.

2 data tables
Table 1

THESE CROSS SECTIONS WERE GIVEN IN DETAIL IN B. Y. OH ET AL., NP B51, 57 (1973).

Table 2

No description provided.


A formation study of n anti-n interactions between 1.51 and 2.90 gev/c. iii. resonance production

Ming, Ma.Z. ; Eastman, P.S. ; Oh, B.Y. ; et al.
Nucl.Phys.B 51 (1973) 77-94, 1973.
Inspire Record 84298 DOI 10.17182/hepdata.32684

A systematic study of p p and p d resonance production cross sections in non-strange annihilation channels between 1.51 and 2.90 GeV/ c has been completed. The data have been analysed in relation to the three known structures at c.m. N N energies of 2190, 2350 and 2375 MeV. Several resonance intermediate states may have broad maxima near the isopin one 2350 MeV structure. However, more data below 1.6 GeV/ c are required to better describe the background in this region before firm conclusions may be drawn.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


A formation study of n anti-n interactions between 1.51 and 2.90 gev/c. i. topological and reaction cross-sections

Eastman, P.S. ; Ming, Ma.Z. ; Oh, B.Y. ; et al.
Nucl.Phys.B 51 (1973) 29-56, 1973.
Inspire Record 84299 DOI 10.17182/hepdata.32706

A systematic study of p p and p d topological and reaction cross sections between 1.51 and 2.90 GeV/ c has been completed. The data have been analysed in relation to the three known structures at c.m. N N energies of 2190, 2350 and 2375 MeV. The data suggest that four- and six-pion annihilations of antiprotons on neutrons may be the source of the 2350 MeV effect. Further data below 1.60 GeV/ c are required to verify this tentative conclusion.

3 data tables
Table 1

No description provided.

Table 2

INCLUDING 3 PCT SYSTEMATIC ERROR.

Table 3

No description provided.


A formation study of n anti-n interactions between 1.09 and 3.45 gev/c. ii. strange particles

Oh, B.Y. ; Eastman, P.S. ; Ming, Ma.Z. ; et al.
Nucl.Phys.B 51 (1973) 57-76, 1973.
Inspire Record 84294 DOI 10.17182/hepdata.8011

A systematic study of p p and p d reactions producing strange particles between 1.09 and 3.45 GeV/ c has been completed. Reaction and resonance cross-section data are presented at 11 p p and 13 p d momentum settings. Evidence for a broad shoulder in the K K 3π final state near 1.8 GeV/ c is presented and contrasted to previously published work on a portion of the final data sample. No evidence for a p n → K 0 K − ω effect near 1.3 GeV/ c is found, ruling out an association of K K ω effects with the nearby isospin one enhancement in the total cross section. Finally, we find no evidence for a p p → K K ω enhancement near 1.8 GeV/ c .

6 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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