THE REACTION 4He(γ, p)3H, CAUSED BY POLARIZED PHOTONS IN THE GIANT RESONANCE RANGE

Peretiatko, A.A.; Murtazin, R. T.; Khodyachikh, A.F.

doi:10.46813/2019-121-021

Cited by 1 publication

(3 citation statements)

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“…It should be noted that in Refs. [12], [14] and [16] the reaction products were registered by different methods, but, within the experimental error, the results are in agreement. It is also possible that there is the contribution of additional polarization caused by the off-axis collimation of the photon beam.…”

Section: Experimental Information Reviewmentioning

confidence: 64%

“…The asymmetry of the 4 He( γ, p)T reaction crosssection was measured [14] on the polarized photon beam, which resulted from planar channeling of 1200 MeV electrons in the diamond single crystal (triangles in Fig. 4).…”

Section: Experimental Information Reviewmentioning

confidence: 99%

“…The reaction was registered with the use of the helium streamer chamber. It has been concluded in [14] that in the angular range 20 0 ≤ θ p ≤160 0 the asymmetry of the reaction cross section is independent of the polar angle emission of the proton.…”

Section: Experimental Information Reviewmentioning

confidence: 99%

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Analysis of $^4$He($γ,p)$T and $^4$He($γ,n)$$^3$He Reactions with Linearly Polarized Photons in the Energy Range up to 100\,MeV

Lyakhno

2019

Preprint

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In a number of investigations, one can find the data on the 4 He(γ,p)T and 4 He(γ,n) 3 He reaction cross sections in the collinear geometry, which are due to spin S=1 transitions of the final-state particles. The ratio of the differential cross section in the collinear geometry to the differential reaction cross section at the nucleon emission angle θN =90 • , and specified by the S=0 electric dipole transition at photon energies in the range 20≤ Eγ ≤100 MeV, is independent of the photon energy, within the experimental error. In the meantime, experiments were made to measure the asymmetry of the cross section Σ(θN ), for the mentioned reactions with linearly polarized photons. It has been found that in the energy range between 20 and 90 MeV, the Σ(θN ) value is also independent of the photon energy, within the experimental error. These data are in agreement with the assumption that transitions with spin S=1 can be due to the contribution of 3 P0 states of the 4 He nucleus, and are inconsistent with the assumption that the spin-flip of the particle system occurred during the reaction as a result of the meson exchange current contribution. The available measured data on the collinear geometry reaction cross sections and the ones on the cross-section asymmetry of the reaction with linearly polarized photons do not agree between themselves. The above mentioned reactions seem to be more convenient for measuring the degree of photon beams linear polarization than the deuteron photodisintegration reactions.

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Section: Experimental Information Reviewmentioning

confidence: 64%

Section: Experimental Information Reviewmentioning

confidence: 99%