Nuclear Cross Sections for 1.4-Bev Neutrons

Coor, T. ; Hill, D.A. ; Hornyak, W.F. ; et al.
Phys.Rev. 98 (1955) 1369-1386, 1955.
Inspire Record 46644 DOI 10.17182/hepdata.248

Transmission measurements in good and poor geometry have been performed at the Brookhaven Cosmotron to measure the total and absorption cross sections of several nuclei for neutrons in the Bev energy range. The neutrons are produced by bombarding a Be target with 2.2-Bev protons. The neutron detector requires the incident particle to pass an anticoincidence counter and produce in an aluminum radiator a charged particle that will traverse a fourfold scintillation telescope containing 6 in. of lead. Contribution of neutrons below 800 Mev are believed small. The angular distribution of neutrons from the target is sharply peaked forward with a half-width of 6°. The integral angular distributions of diffraction scattered neutrons from C, Cu, and Pb are measured by varying the detector geometry. The angular half-width of these distributions indicates a mean effective neutron energy of 1.4±0.2 Bev. The total cross sections σH and σD−σH are measured by attenuation differences in good geometry of CH2-C and D2O-H2O, with the result: σH=42.4±1.8 mb, σD−σH=42.2±1.8 mb. The cross sections of eight elements from Be to U are measured in good and poor geometry, and the following values of the total and absorption cross sections are deduced (in units of millibrans): Experimental errors are about 3 percent in σtotal and 5 percent in σabsorption. An interpretation of these cross sections is given in terms of optical model parameters for two extreme nuclear density distributions: uniform (radius R) and Gaussian [ρ=ρ0exp−(ra)2]. The absorption cross-section data are well fitted with R=1.28A13 or a=0.32+0.62A13 in units of 10−13 cm. A nuclear density distribution intermediate between uniform and Gaussian will make the present results consistent with the recent electromagnetic radii.

2 data tables

'ALL'.

No description provided.


Elastic pi+-p and p-p Scattering at 1.23 Bev/c

Roellig, L.O. ; Glaser, D.A. ;
Phys.Rev. 116 (1959) 1001-1007, 1959.
Inspire Record 944991 DOI 10.17182/hepdata.736

Elastic π+−p scattering at 1.1 Bev and elastic p−p scattering at 582 Mev have been measured using a propane bubble chamber. On the basis of 661 identified π+−p elastic scatterings found in the scanning of 1.726×106 cm of pion track, the total elastic cross section is found to be 12.3±1.2 mb. The differential cross section is rather isotropic at large angles and exhibits a strong peak for small forward scattering angles. If the forward peak is interpreted as diffraction scattering according to the optical model, the data are best fitted by a proton with a π+−p interaction radius, R=(0.99−0.11+0.13)×10−13 cm and an opacity, O=0.70−0.07+0.06. The total cross section for p−p elastic scattering at 582 Mev was found to be 24.2±1.6 mb on the basis of 2442 elastic scatterings observed in the scanning of 3.000×106 cm of proton track. Both differential and total p−p cross sections are in excellent agreement with the results of counter experiments in this energy region.

2 data tables

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Photoproduction Cross Sections for pi+ and K+ Mesons at 3.4 TO 4.0 GeV and Their Comparison with SU (3)

Elings, V.B. ; Cohen, K.J. ; Garelick, D.A. ; et al.
Phys.Rev.Lett. 16 (1966) 474-477, 1966.
Inspire Record 50878 DOI 10.17182/hepdata.21779

None

5 data tables

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Photoproduction cross sections for $\pi^+$ and $K^+$ mesons at 3.4 to 4.0 {GeV} and their comparison with {SU(3)}

Elings, V.B. ; Cohen, K.J. ; Garelick, D.A. ; et al.
Phys.Rev. 156 (1967) 1433-1443, 1967.
Inspire Record 51624 DOI 10.17182/hepdata.406

The differential cross sections for the photoproduction reactions γ+p→π++n, γ+p→K++Λ0, and γ+p→K++Σ0 have ben measured for incident laboratory photon energies between 3.4 and 4.0 GeV and for meson center-of-mass angles from about 25° to 45°. The reactions were studied by observing only the charged mesons. The momenta, velocities, and angles of the mesons were measured with a magnetic spectrometer, and the equivalent of nearly monochromatic gamma rays was obtained by performing bremsstrahlung subtractions. The cross sections agree with the inequality predicted from unbroken SU(3). The measured behavior of dσdt as a function of t shows similarities to that observed in studies of mesonnucleon scattering.

6 data tables

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Pi-plus-minus p elastic scattering in the 2-gev region

Busza, W. ; Duff, B.G. ; Garbutt, D.A. ; et al.
Phys.Rev. 180 (1969) 1339-1348, 1969.
Inspire Record 55449 DOI 10.17182/hepdata.6227

π±p elastic differential cross sections in the momentum range 1.72-2.80 GeV/c have been measured at the proton synchrotron "NIMROD" of the Rutherford High Energy Laboratory. The results are tabulated, and analyses of the differential cross sections employing optical models and Legendre polynomial expansions are advanced. A critical discussion of a recent interpretation of differential-cross-section structure in terms of interference between resonant and background amplitudes is presented.

25 data tables

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Total cross-sections of pi-minus, k-minus, and anti-p on protons and deuterons in the momentum range 20-65 gev/c

The IHEP-CERN collaboration Allaby, J.V. ; Bushnin, Yu.B. ; Denisov, S.P. ; et al.
Phys.Lett.B 30 (1969) 500-505, 1969.
Inspire Record 56636 DOI 10.17182/hepdata.6171

Total cross-section data are presented for negative pions, kaons, and antiprotons on protons and deuterons in the momentum range 20 GeV/ c to 65 GeV/ c in 5 GeV/ c steps.

3 data tables

Axis error includes +- 0.0/0.0 contribution.

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Total and absorption cross-sections of pi-, k- and anti-p in the momentum range 20-65 gev/c

Allaby, J.V. ; Bushnin, Yu.B. ; Gorin, Yu.P. ; et al.
Yad.Fiz. 12 (1970) 538-557, 1970.
Inspire Record 63289 DOI 10.17182/hepdata.18403

None

2 data tables

No description provided.

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Cross sections for p p ---> d rho+ from 4.0 to 12.3 gev/c and a search for the delta+

Anderson, H.L. ; Dixit, M. ; Evans, H.J. ; et al.
Phys.Rev.Lett. 26 (1971) 108-112, 1971.
Inspire Record 69063 DOI 10.17182/hepdata.21629

Forward differential cross sections for isospin-1 bosons produced in p+p→d+x+ were measured using a deuteron missing-mass spectrometer at a small angle between 4.0- and 12.3−GeVc incident momentum. Differential cross sections for π+ and ρ+ were extracted from the spectra using phase-space backgrounds. They range from 10.4 to 0.4 μb/sr for π+ and from 1.4 to 0.3 μb/sr for ρ+. A bump near 6 GeVc appears in both dπ and dρ channels. No clear evidence is seen for higher-mass bosons. The possible δ+ cross sections average less than 0.01 μb/sr.

3 data tables

TECHNIQUE USED...ELECTRONIC. TABLE 1.

TECHNIQUE USED...MISSING MASS. BREIT WIGNER USED WITH FIXED WIDTH (150 MEV) AND VARIABLE MASS (LATTER VARIED WITH MOMENTA FROM 715 TO 765 MEV). 6 PERCENT NORMALIZATION ERROR; 20 PERCENT FROM BREIT WIGNER FIT. TABLE 1.

TECHNIQUE USED...MISSING MASS. CROSS-SECTIONS CORRESPOND TO VERY NARROW DELTA (962).


Experimental comparison of anti-d p and anti-p d total cross sections

Gorin, Yu.P. ; Denisov, S.P. ; Donskov, S.V. ; et al.
Yad.Fiz. 14 (1971) 134-136, 1971.
Inspire Record 69450 DOI 10.17182/hepdata.19261

None

2 data tables

Axis error includes +- 0.0/0.0 contribution (GLAUBER).

Axis error includes +- 0.0/0.0 contribution (GLAUBER).


Total cross-sections for pi- p ---> lambda k0 from threshold to 1.13 gev/c

Jones, J.J. ; Bowen, T. ; Dawes, W.R. ; et al.
Phys.Rev.Lett. 26 (1971) 860-863, 1971.
Inspire Record 69027 DOI 10.17182/hepdata.21505

Total cross sections for π−p→ΛK0 have been measured using optical spark chambers from threshold to 1.13−GeVc beam momentum in 19−MeVc intervals, but with a 1−MeVc resolution in the regions of the ΛK and ΣK thresholds. The behavior near ΛK threshold indicates a significant s-wave contribution, but this experiment is unable to resolve any cusplike behavior in the region of the ΣK thresholds. The cross section shows a broad peak in the vicinity of 1.05−GeVc beam momentum.

1 data table

No description provided.