Angular distributions of photoneutrons from the 207, 208Pb(γ, n0) reactions

Y. Birenbaum; Z. Berant; S. Kahane; A. Wolf; R. Moreh

doi:10.1016/0375-9474(81)90033-6

Angular distributions of photoneutrons from the ^{207, 208}Pb(γ, n₀) reactions

Y. Birenbaum, Z. Berant, S. Kahane, A. Wolf, R. Moreh

Department of Physics

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Angular distributions of photoneutrons from the ^{207, 208}Pb(γ, n₀) reactions were measured at 11 angles around θ = 90°. The γ-source, E_γ = 7-11.4 MeV, contained discrete lines (ΔE ≲ 30 eV) obtained from n-capture and was used in conjunction with a high-resolution ³He spectrometer. Strong evidence for an E2 contribution and for E2-E1 and possibly E1-M1 interference was obtained in both ²⁰⁷Pb and ²⁰⁸Pb. The results are compared with calculations using a direct-semidirect model which involved an E1 and isoscalar E2 giant resonances. The results indicate that this model could explain only certain features of the data while most of the other features remain unexplained.

Original language	English
Pages (from-to)	483-494
Number of pages	12
Journal	Nuclear Physics A
Volume	369
Issue number	3
DOIs	https://doi.org/10.1016/0375-9474(81)90033-6
State	Published - 26 Oct 1981

Keywords

Nuclear reactions

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/0375-9474(81)90033-6

Cite this

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title = "Angular distributions of photoneutrons from the 207, 208Pb(γ, n0) reactions",

abstract = "Angular distributions of photoneutrons from the 207, 208Pb(γ, n0) reactions were measured at 11 angles around θ = 90°. The γ-source, Eγ = 7-11.4 MeV, contained discrete lines (ΔE ≲ 30 eV) obtained from n-capture and was used in conjunction with a high-resolution 3He spectrometer. Strong evidence for an E2 contribution and for E2-E1 and possibly E1-M1 interference was obtained in both 207Pb and 208Pb. The results are compared with calculations using a direct-semidirect model which involved an E1 and isoscalar E2 giant resonances. The results indicate that this model could explain only certain features of the data while most of the other features remain unexplained.",

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T1 - Angular distributions of photoneutrons from the 207, 208Pb(γ, n0) reactions

AU - Birenbaum, Y.

AU - Berant, Z.

AU - Kahane, S.

AU - Wolf, A.

AU - Moreh, R.

PY - 1981/10/26

Y1 - 1981/10/26

N2 - Angular distributions of photoneutrons from the 207, 208Pb(γ, n0) reactions were measured at 11 angles around θ = 90°. The γ-source, Eγ = 7-11.4 MeV, contained discrete lines (ΔE ≲ 30 eV) obtained from n-capture and was used in conjunction with a high-resolution 3He spectrometer. Strong evidence for an E2 contribution and for E2-E1 and possibly E1-M1 interference was obtained in both 207Pb and 208Pb. The results are compared with calculations using a direct-semidirect model which involved an E1 and isoscalar E2 giant resonances. The results indicate that this model could explain only certain features of the data while most of the other features remain unexplained.

AB - Angular distributions of photoneutrons from the 207, 208Pb(γ, n0) reactions were measured at 11 angles around θ = 90°. The γ-source, Eγ = 7-11.4 MeV, contained discrete lines (ΔE ≲ 30 eV) obtained from n-capture and was used in conjunction with a high-resolution 3He spectrometer. Strong evidence for an E2 contribution and for E2-E1 and possibly E1-M1 interference was obtained in both 207Pb and 208Pb. The results are compared with calculations using a direct-semidirect model which involved an E1 and isoscalar E2 giant resonances. The results indicate that this model could explain only certain features of the data while most of the other features remain unexplained.

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