The reactions 6, 7Li, 9Be, 10B(e, e′p) at 700 MeV and DWIA analysis

doi:10.1016/0375-9474(78)90083-0

Nuclear Physics A

Volume 296, Issue 3, 27 February 1978, Pages 431-443

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Abstract

The proton spectral functions of ⁶Li, ⁷Li, ⁹Be and ¹⁰B obtained from the (e, e′p) reactions at 700 MeV are presented. The results were analyzed in the distorted-wave impulse approximation, using the shell-model single-particle wave functions consistent with the elastic electron scattering results. The observed Ip proton momentum distributions for the nuclei ⁶Li, ⁷Li and ⁹Be show significant disagreement with the shell-model momentum distributions. The occupation probabilities of the proton single-particle states are around 0.7, with a few exceptions.

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Double-differential cross sections of the ^10,11B(n, p)^10,11Be reactions have been measured at 96 MeV in the angular range 0°–30° for excitation energies up to 35 MeV. The spectra have been decomposed into different multipolarities using sample angular distributions calculated within the distorted-wave Born approximation. From the identified Gamow–Teller strength, S_β⁺ values were obtained for ¹⁰B and ¹¹B. At higher excitation energies, the spectra are dominated by L=1 strength in broad distributions with maxima around 22 and 12 MeV in ¹⁰B and ¹¹B, respectively.
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The Dalitz phenomenological approach to non-mesonic decay of s-shell hypernuclei is extended to 1p-shell hypernuclei using the closure approximation over residual nucleus states. The developed formalism applied to the analysis of the BNL data on decays of _Λ¹²C, _Λ¹¹B, _Λ⁹Be and _Λ⁵He. The observed proximity of the ratios $γ = Γ_{n} Γ_{p}$ for _Λ¹²C and _Λ¹¹B is accounted for by a similarity of structure factors. Constraints on the permissible values of γ(_Λ¹²C) and γ(_Λ¹¹B) have been found. The equality of the γ′s for 1p-shell hypernuclei with the nuclear-core spin and isospin J_N = T = 0 has been established. Proportionality of Γ_nm, Γ_n and Γ_p to the number of nucleons in these hypernuclei has been shown. A qualitative explanation of the observed ratios $Γ_{nm} (_{Λ}^{12} C) Γ_{nm} (_{Λ}^{5} He)$ and $Γ_{nm} (_{Λ}^{9} Be) Γ_{nm} (_{Λ}^{5} He)$ is given.
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^☆: Work supported in part by the Grant-in-Aid from the Ministry of Education.

^††: Present address: Software division, Fujitsu Limited. Ohta-ku, Tokyo, Japan.

^†††: Present address: National Laboratory for High Energy Physics, Tsukuba, Ibaraki, Japan.

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Nuclear Physics A

Abstract

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Cited by (25)

The <sup>10,11</sup>B(n, p)<sup>10,11</sup>Be reactions at E<inf>n</inf>=96 MeV

On non-mesonic decay of light Λ-hypernuclei

The <sup>6</sup>Li(γ,p) reaction in the 30-100 MeV photon energy range

The giant dipole resonance in light nuclei and related phenomena

DWIA calculations of proton momentum distributions in <sup>12</sup>C and <sup>16</sup>O(e, e'p) reactions

Deep hole states

The reactions 6, 7Li, 9Be, 10B(e, e′p) at 700 MeV and DWIA analysis☆

Abstract

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The reactions ^{6, 7}Li, ⁹Be, ¹⁰B(e, e′p) at 700 MeV and DWIA analysis☆