Very cold neutrons from 60 μeV to 0.1 μeV were obtained through a vertical total-reflecting neutron guide tube. Total cross sections measured by time-of-flight technique for gold and aluminium were found to obey the 1 ν law.
No description provided.
The spin-spin correlation parameter C NN at 50° and 90° c.m. for elastic pp-scattering has been obtained in the energy range 0.69–0.95 GeV. It was found that the parameter C NN (90°) shows resonance-like structure at energies near 700 MeV. Its energy dependence does not agree with Hoshizaki's phase-shift analysis predictions. C NN (50°) agrees well with these predictions and does not show any structure within the accuracy of the measurements.
No description provided.
The 4 He( γ ,p) 3 H reaction cross section has been measured with tagged photons of energy 81–158 MeV. Protons were detected over the angular range 55°–125°. The scaling of the data as a function of momentum mismatch has been examined for two reaction models, the modified quasideuteron mechanism and quasifree knockout. Both models show clear scaling behaviour but comparison of the predicted and measured scaling function shapes favours the modified quasideuteron mechanism at momenta up to ≈500 MeV/ c .
No description provided.
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A measurement of the spin correlation parameters A xx (90° cm) and A yy (90° cm) of 47.5 MeV proton-proton scattering has been performed by means of polarized beam and a polarized target.
No description provided.
The processes K − d → Σ − p and K − d → Λn have been observed at K − momenta of 340 MeV/c and 400 MeV/c. The cross sections for these processes are: σ ( Σ − p) = 200 ± 30 μ b at 400 MeV/c, σ ( Λ n) = 200 ± 30 μ b at 400 MeV/c, σ ( Σ − p) = 300 ± 100 μ b at 340 MeV/c, σ ( Λ n) = 360 ± 150 μ b at 340 MeV/c.
No description provided.
About 100 000 pictures, with an average of ∼12K + per picture, taken in the 81 cm Saclay deuterium bubble chamber exposed to a separated 3 GeV/c K + beam have been analysed for the reaction K + d→K 0 pp in the 1-prong V 0 and 2-prong V 0 topologies. 214 such events have been found allowing a determination of the differential cross-section. A comparison with the prediction of Rarita and Schwarzschild yields reasonable agreement; in particular a large real part is inferred for the amplitude for the reaction K + n→K 0 p.
The errors are statistical only.
The errors are statistical only. To evaluate the cross section on neutron thE data are divided on (1-FORMFACTOR(C=DEUT). For definition of the formfactor see L. Durand, Phys. Rev. 115 (1959) 1020.
In a study of K + p interactions at 12.7 GeV/ c we have carried out a search for meson resonances having any one of the following properties: (a) a strangeness of S =2, (b) S =1 and isotopic spin of I= 3 2 , or (c) S =1, I= 1 2 and decaying into an antihyperon ( Y ) and a nucleon (N).
No description provided.
Spectra of hydrogen and helium ions emitted after stopped antiproton annihilation in nuclei have been measured with a Si-detector telescope. Targets of 12 C, 40 Ca, 63 Cu, 92 Mo, 98 Mo and 238 U were used. The 3 He and 4 He energy spectra can be fitted with the exponential function e − E / T . The parameter T is essentially independent of the target mass number A . A simple pickup model reproduces the 4 He/ 3 He ratios as a function of Z and N (target proton and neutron number). The proton spectra from the 238 U target indicate that some protons are also emitted by the fission fragments.
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Reaction cross sections for 65.5 MeV protons have been measured for 9 Be, 12 C, 16 O, 28 Si, 40 Ca, 58,60 Ni, 112.116.118.120.124 Sn, and 208 Pb. The results are compared with optical model predictions using relativistic global potentials.
No description provided.
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Neutrons arising from the breakup of a 30 MeV/nucleon 19 C beam on a tantalum target have been measured using the 98 element array DEMON. A narrow, forward peaked neutron angular distribution, with a corresponding momentum spread considerably smaller than those measured simultaneously for 21 N, 22 O and 24 F, was observed for charged fragments with Z < Z proj . Interpreted in terms of the core-breakup reaction model, the results support the existence of a one neutron halo in 19 C.
No description provided.
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