PHOTONEUTRON CROSS SECTION OF Ni<sup>58</sup>

Roalsvig, J. P.; Haslam, R. N. H.; McKenzie, D. J.

doi:10.1139/p59-067

Cited by 15 publications

(8 citation statements)

References 4 publications

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“…Shown also in Fig. 9 are the cross-section curves presented by R~Iillar and Cameron (1953) and by Stoll (1954). Both are smaller in the region of the big peak than the curve found here.…”

Section: Energy Dependence Of the Reaction 016(y A)c1"supporting

confidence: 49%

“…2). These doses were corrected for the inverse square attenuation, for the absorption of X rays by the lucite block, and for the peaking effect of the X-ray bean1 by a method outlined by Roalsvig et al (1959). The corrected doses are given in Table I.…”

Section: Exposure Developing and Searchingmentioning

confidence: 99%

“…These are probably the events which Hanni et al (1948) regarded as being due to the reaction C12(r, a)Be8 with Be8 in the ground state. The remaining single alpha-particle tracks were attributed to photoalpha reactions in silver and bromine in the emulsion (Haslam et al 1952), though Waffler andYounis (1949) had, using a watersoaked plate, attributed the single tracks to 016. Waffler and Younis did not mention seeing recoil-type events.…”

Section: Introductionmentioning

confidence: 99%

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Gamma–alpha Reactions in the Light Nuclei of Nuclear Emulsions

Greenberg¹,

Roalsvig²,

Haslam³

1964

Can. J. Phys.

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Ilford E.l nuclear emulsions were loaded with various amounts of glycerine to vary the content of carbon and of oxygen, and were then irradiated in the beam of the University of SasBatchewan betatron. The numbers of single alpha-particle traclcs and of four-pronged alpha-particle stars were correlated to the oxygen content of the plates and the number of three-pronged stars to the carbon content. The yields for the reactions OIG(?, a)CX2, OIG(y, 4a), and CI2(?, 3a) for bren~s-strahlung of 24-Mev maxirnum energy were found without confusion wlth reactions in other nuclides of the emulsion and without having to rely on mornentuln balances for identification of the events. I t was shown that the method of identification of OIG(?, a)C12 events by the measurement of the track of the C12 was not reliable. The large number of alpha tracks in the energy range 4 to 5 Mev, few of which showed a C12 track, was shown to be due largely to reactions in OIG. I t was also possible, by irradiating en~ulsions a t 17-and a t 24-Mev maximum bremsstrahlung energy, to find the energy levels in OIG and in C12 through which the reactions passed.

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“…Shown also in Fig. 9 are the cross-section curves presented by R~Iillar and Cameron (1953) and by Stoll (1954). Both are smaller in the region of the big peak than the curve found here.…”

Section: Energy Dependence Of the Reaction 016(y A)c1"supporting

confidence: 49%

Section: Exposure Developing and Searchingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gamma–alpha Reactions in the Light Nuclei of Nuclear Emulsions

Greenberg¹,

Roalsvig²,

Haslam³

1964

Can. J. Phys.

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“…This figure is Intended to show that both £1 and £2 components are necessary to explain the (<?, o) cross section. Resonances or resonancelike structures at approximate excitation energies of (7-8) MeV, 13 MeV, (16)(17) .…”

Section: Methoomentioning

confidence: 99%

Photonuclear data - abstract sheets 1955 - 1982 :

Fuller¹

1985

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Average Li cross section is 28 mb; cross section with detector response weighted for low energy neutrons Assumed ratio 17»6/l4.8 = 1*7* Calculated cross section at 14.8 and 17.6 MeV assuming cross section curves measured at Pennsylvania and Saskatchewan (refer Table i) . Tadle I. Cross sections for photoncutron emission induced by the lithium gamma rays. The results are compared with previous data.

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“…The scale of the yield curve was determined by comparing the yields from thin samples of copper and teflon a t 22 A4ev with the aid of a flow counter; the yield from the reaction C U~~(~,~) C U~~ was assumed to be 2.25X10S disintegrations/g-atom 100 r (Roalsvig et al 1959).…”

Section: Introductionmentioning

confidence: 99%

THE GAMMA-NEUTRON CROSS SECTION FOR F¹⁹

King¹,

Haslam²,

McDonald³

1960

Can. J. Phys.

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The F'"(r,n)Ps reaction has been st~idied by irradiating teflon samples ill the X-ray beam of a 25-Mev betatron and detecting the annihilation radiation emitted cluring the decay of the residual nuclei. The cross section shows maxima a t 10.6 (very small), 12.4, 14.0, lG.l, 17.2, and 19.3 RiIev. The peak a t 12.4 Mev is possibly duc to excitation of the last neutron in F1%ith only a s~nall disturbance of the core nucleons. The peaks a t 14.0 and 19.1 Mev are interpreted as the components of a split giant resonance, indicating an intrinsic ql~adrupole moment, Qo, of approsimately 0.30 X 10-?' cm? for I:19.He predicts the ratio, Eb/E,, of the two resonance energies to be 1.31. The 'Manuscript

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PHOTONEUTRON CROSS SECTION OF Ni⁵⁸

Cited by 15 publications

References 4 publications

Gamma–alpha Reactions in the Light Nuclei of Nuclear Emulsions

Gamma–alpha Reactions in the Light Nuclei of Nuclear Emulsions

Photonuclear data - abstract sheets 1955 - 1982 :

THE GAMMA-NEUTRON CROSS SECTION FOR F¹⁹

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PHOTONEUTRON CROSS SECTION OF Ni58

Cited by 15 publications

References 4 publications

Gamma–alpha Reactions in the Light Nuclei of Nuclear Emulsions

Gamma–alpha Reactions in the Light Nuclei of Nuclear Emulsions

Photonuclear data - abstract sheets 1955 - 1982 :

THE GAMMA-NEUTRON CROSS SECTION FOR F19

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PHOTONEUTRON CROSS SECTION OF Ni⁵⁸

THE GAMMA-NEUTRON CROSS SECTION FOR F¹⁹