Breakup of deuterons by 14.4 MeV neutrons

Ilakovac, K.; Kuo, L.G.; Petravić, M.; Šlaus, I.; Tomaš, P.

doi:10.1016/0029-5582(63)90346-8

Cited by 35 publications

(4 citation statements)

References 24 publications

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“…Attempts to consider quantitatively the interference between resonant processes, and between a resonant and a nonresonant process, have been undertaken. 6 ' 42,43 The pioneering work in describing sequential processes was done by Watson 44 and by Migdal. 45 Later a somewhat different model was proposed by Phillips, Griffy, and Biedenharn, 46 according to which the spatial localization can modify the observables in multiparticle reactions.…”

Section: Final-state Interactions In Multiparticle Reactionsmentioning

confidence: 99%

Comparison Procedure and the Neutron-Neutron Scattering Length

Oers

Šlaus

1967

Phys. Rev.

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At present the only means for obtaining information about the neutron-neutron scattering length a nn and effective range ro are studies of reactions with three or more particles in the final state. It was felt that the comparative analysis of the various reactions which exhibit a ^o nucleon-nucleon interaction in the final state would be a reliable procedure by which to extract a nn . Thus the nucleon-induced breakup reactions of deuterons and trions were analyzed using the Born approximation and S-state wave functions for the deuteron, the trion and the two nucleons having a low relative energy in the final state. We found the comparative analysis of the trion breakup processes unsuccessful in the energy range considered. The values for a nn extracted in analyses of the reaction D(n,p)2n around 14 MeV cannot be reconciled with the theoretical predictions based on exact charge symmetry and using either a hard-core or a velocity-dependent potential. The present analysis indicates, however, that for incident energies larger than 30 MeV the distorting interference effects are removed and that the deuteron breakup processes become more promising for the determination of a nn . Montague, Phys. Rev. 87, 215 (1952);

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Section: Final-state Interactions In Multiparticle Reactionsmentioning

confidence: 99%

Comparison Procedure and the Neutron-Neutron Scattering Length

Oers

Šlaus

1967

Phys. Rev.

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“…The number of breakup protons produced by degraded and obliquely incident neutrons is difficult to estimate since the energy and angular variation of the proton spectra from the reaction B(n } p)2n are not known. It is experimentally established that the angular distributions are peaked forward 34,38 and that the total cross section for the deuteron breakup increases almost linearly with the energy 44 up to £ w~1 4 MeV. This angular and energy dependence of the cross section is well reproduced by the theory of Frank and Gammel.…”

Section: Methodsmentioning

confidence: 61%

Charge Dependence of Nuclear Forces and the Breakup of Deuterons and Tritons

et al. 1964

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The proton spectrum at 4.8° from the reaction D(n,p)In, E"=14.4 MeV, was measured. The high-energy part of that spectrum was analyzed yielding for the neutron-neutron % SQ scattering length the value: &**»= -21.7±1 F. The correction due to magnetic interaction is 0.8 F and the pure nuclear a n % is therefore a nn = -22.5=fcl F. This experimental value is compared with the calculations of Wong and Noyes, and Lin, and indicates that nuclear forces depart by 2-3% from the charge symmetry. The charged particle spectrum at 4.8° from the reaction n-\-T -»w+T, 2n+d, and 3n+p, £"=14.4 MeV, was also measured. The effects of the final-state interactions are evident in the spectrum.

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“…The preferred value for a nn extracted from the first reaction is 1 ' 2 -17 F, unfortunately with an uncertainty of about 5 F. Several investigations 3 " 5 of the second reaction gave values around -22 F. While the theoretical analysis of the reaction H 2 (7T~,y)2« can be performed with an accuracy of ±1 F, 8 the reactions with more than two nucleons in the final state are considerably more difficult for interpretation.…”

Section: Information About the Neutron-neutron Scattering Length Frommentioning

confidence: 95%

“…This allows extension of the analysis to 6.3 MeV, about twice as far as was done for the reaction H 2 (w,/>)2w. 8 From the least-squares analysis one finds a nn = -18 ±3 F.…”

Section: Fig 1 the Deuteron Spectra At 0° From The Reaction N + H 3mentioning

confidence: 99%

Information About the Neutron-Neutron Scattering Length from the ReactionH3(n,d)2n

et al. 1965

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Recently the reactions H 2 (7r"~,y)2n and H 2 (w, p)2n were investigated with the aim of determining the neutron-neutron l S 0 scattering length, a nn . The preferred value for a nn extracted from the first reaction is 1 ' 2 -17 F, unfortunately with an uncertainty of about 5 F. Several investigations 3 " 5 of the second reaction gave values around -22 F. While the theoretical analysis of the reaction H 2 (7T~,y)2« can be performed with an accuracy of ±1 F, 8 the reactions with more than two nucleons in the final state are considerably more difficult for interpretation.In a reaction a+A-~b +n + n the spectrum of the particle b reflects the neutron-neutron final-state interaction. However, distortive effects arise from at least two sources 7 :(i) Interaction between b and the system 2w. It is reasonable to expect that this depends upon the type of the particle b and on the relative b-2n energy.(ii) The interference between the n-n and the n-b resonances 8 and the interference between resonant and nonresonant processes. 9 The study of the reaction H 3 (n,d)2n offers another possibility 4 to extract a nn . The comparison of the reaction E 2 (n f p)2n and E B (n,d)2n allows one also to investigate the influence of the various distortive effects.In order to determine kinematically such a reaction one has to measure five parameters. The measurement of the energy of the charged particle at 0° at a fixed incident energy is, thus, an incomplete measurement, and only that region of the spectrum which corresponds to the strong final-state interaction of the two neutrons is liable to meaningful interpretation.The deuteron spectra from the reaction H 3 (n, d)2n at E n = 14.4 MeV were measured with different detecting systems. The targets used were (1) a solid Cu-Ti-H 3 target containing 0.3 mg of H 3 and 10% of He 3 ; (2) two gas targets, one containing 0.1 mg and the other 1.3 mg of H 3 , with the He 3 content less than 0.4%. The charged particles were detected with a semiconductor counter telescope 10 in conjunction with multidimensional analyzers. 11 The telescope consisted of two thin AE counters and an E counter depleted to detect 11.5-MeV protons.Two pulses (from the A£ 2 and E counters) were analyzed by a lOOxlOO-channel analyzer. The resulting three-dimensional graphs gave proton, deuteron, and triton &E 2 -vs-E spectra simultaneously. 12 In a set of measurements three pulses (from the AE lf &E 29 and E counters) were analyzed by a lOOxlOOxlOO-channel analyzer. All those events for which AE X and AE 2 pulses did not satisfy specific criteria were rejected. 13

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Breakup of deuterons by 14.4 MeV neutrons

Cited by 35 publications

References 24 publications

Comparison Procedure and the Neutron-Neutron Scattering Length

Comparison Procedure and the Neutron-Neutron Scattering Length

Charge Dependence of Nuclear Forces and the Breakup of Deuterons and Tritons

Information About the Neutron-Neutron Scattering Length from the ReactionH3(n,d)2n

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