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Measurement of spin-dependent total cross-section difference $\Delta\sigma_T$ in neutron-proton scattering at 16 MeV

Broz, J. ; Cerny, J. ; Dolezal, Z. ; et al.

Z.Phys.A 354 (1996) 401, 1996.

Inspire Record 397734 DOI 10.17182/hepdata.31421

A new measurement of $\Delta\sigma_T$ for polarized neutrons transmitted through a polarized proton target at 16.2 MeV has been made. A polarized neutron beam was obtained from the $^{3}\rm{H}(d,\vec n)^{4}\rm{He}$ reaction; proton polarization over 90\% was achieved in a frozen spin target of 20 cm$^3$ volume. The measurement yielded the value $\Delta\sigma_T=(-126\pm21\pm14)$ mb. The result of a simple phase shift analysis for the $^3S_1-^3D_1$ mixing parameter $\epsilon_1$ is presented and compared with the theoretical potential model predictions.

1 data table

Table 1

No description provided.

Differential cross-section for n p elastic scattering in the angular region 50-degrees < Theta* < 180-degrees at 459-MeV

Northcliffe, L.C. ; Jain, M. ; Evans, M.L. ; et al.

Phys.Rev.C 47 (1993) 36-46, 1993.

Inspire Record 358672 DOI 10.17182/hepdata.26016

The differential cross section for n-p elastic scattering at 459 MeV in the c.m. angular region 50°<θ*<180° has been measured with high statistical precision and good relative accuracy. The uncertainty in the absolute normalization (based on the simultaneously measured yield of deuterons from the np→dπ0 reaction) was initially estimated to be ∼7%. The results agree well with back-angle data obtained independently at LAMPF but less well with results from Saclay and the Princeton-Pennsylvania Accelerator and, except for a normalization difference of 10%, are fairly well represented by a phase-shift fit. The pole-extrapolation method of Chew was used to extract the pion-nucleon coupling constant f2 from the back-angle portion of the data. The value obtained, f2=0.069, is somewhat smaller than the values 0.0735–0.0790 obtained from analyses of pion-nucleon scattering, tending to confirm the need for an upward renormalization of the angular distribution by ∼10%.

1 data table

Table 1

No description provided.

Cross-sections of $N P$ Interaction Channels at $P (N$) = 1-{GeV}/c. - 5-{GeV}/c. (In Russian)

Besliu, C. ; Gruia, S. ; Ierusalimov, A.P. ; et al.

Sov.J.Nucl.Phys. 43 (1986) 565-568, 1986.

Inspire Record 238221 DOI 10.17182/hepdata.17455

None

5 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Absolute Cross-Section Measurements Using Neutron Beams in Bubble Chambers

Ward, D.R. ;

Nucl.Phys.B 92 (1975) 101-119, 1975.

Inspire Record 102950 DOI 10.17182/hepdata.32030

We introduce a novel technique for the investigation of neutron-proton interactions in a bubble chamber, based on the tagging of neutrons by their interactions, which has made possible the absolute normalization of the neutron beams in two experiments. In addition, measurements have been made on elastic scattering and inclusive cross sections which have been largely inaccessible to existing bubble chamber techniques.

2 data tables

Table 1

ERRORS ARE STATISTICAL. AN EXTRA 5 PCT SYSTEMATIC HAS TO BE ADDED.

Table 2

ERRORS CONTAIN SOME SYSTEMATIC UNCERTAINTY.