The Photodisintegration of Nuclei with Z Between 9 and 30

Spicer, B.M.

doi:10.1071/ph580490

Cited by 19 publications

(4 citation statements)

References 18 publications

(28 reference statements)

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“…It has been pointed out by Spicer 19 that splitting of the giant resonances should be exhibited for nuclei with atomic numbers between 9 and 30, since there is evidence that a considerable number of nuclei in this range are highly deformed. Both V and Co giant resonances exhibit such splitting to a marked degree, and thus yield intrinsic quadrupole moments.…”

Section: Discussionmentioning

confidence: 99%

Photoneutron Cross Sections forV51andCo59

et al. 1962

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Section: Discussionmentioning

confidence: 99%

Photoneutron Cross Sections forV51andCo59

et al. 1962

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“…9) confirms the existence of this small peak and extends the spectrum to a proton energy of 14 in o(7,p) of our experiment and a(y,n) as derived by Geller provides support for charge symmetry of nuclear forces. The a(7,n) of Milone et al 3 6 at a bremsstrahlung endpoint energy of 31 Niev is not in agreement with our proton spectra; but because of the statistics of the (7,n) experiment the difference is probably not significant.…”

Section: A Excitation and Energy Distribution Experimentsmentioning

confidence: 36%

Photoprotons From Oxygen, Fluorine, Neon, and Other Light Elements

Dodge¹

1961

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The (7,p) reaction in 0, F, Ne, and C has been studied with electrons of energies up to 36 Mev. Survey studies were made of the Al, A, and B (Y,P) energy spectra. The reactions were initiated by electrons, and not real photons; but it has been theoretically predicted and received partial experimental verification that there is a one to one correspondence between electron-and photon-induced reactions, and that one can assume, when analyzing electron-production yields, that the electron has associated with it a virtual-photon spectrum, similar to the real-photon bremsstrahlung spectrum. 'The virtual and bremastrahlung spectra differ, however, in that the virtual-photon spectrum depends on the multipolarity of the induced transition and the angle between the incident electron beam and the emitted disintegration product, while the bremsstrahlung spectrum does not. The electron production yields were analyzed with the use of the E-1 virtualphoton spectrum to obtain a(7,p). The proton yields and corresponding cross sections of 0, F, and Ne contain more than two peaks or resonances.Neon exhibits the most interesting spectrum. It has a series of wellresolved, evenly-spaced peaks whose envelope has the usual giant-resonance

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“…2 For the special case of the two-line fit (i.e., for deformed nuclei which do have a symmetry axis), the elastic part for a nucleus of ground-state spin j can be shown to be 35 j(2j-l)/(j+l)(2j+3) times the total given by Eq. (14).…”

Section: Ll 12 2 +1mentioning

confidence: 95%

“…The results appropriate for a two-line fit can be obtained directly from Eq. (13) by setting ci=cT2=|o-i2 and L\-Z 2 = Ln: -d s <T-\ T /13+cosV\/ 1 -dQJ \ 10 0 XKLm-L^+^-^J (14) In this case, o r a=flri+(r2+cr 3 =2o'i+o'3. (Note that <r 3 /2\ and Z 3 <7 3 /2X are equivalent to a/3 and a/3 in the notation used by Fuller and Hayward 229 ; similarly <r 2 /2X and Z 2 (T 2 /2X are 0/3 and b/3.…”

Section: Ll 12 2 +1mentioning

confidence: 98%

Interpretation of Quasi-Elastic Scattering of 11-19 MeV Monochromatic Photons by Holmium Using Zero-Point Vibrations in the Hydrodynamic Model

et al. 1963

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A bremsstrahlung monochromator with an energy resolution of 0.6% was used to measure the 135° quasi-elastic scattering of photons by Ho 166 at 48 energies between 10.92 and 19.06 MeV. No very fine structure was observed but the gross splitting of the giant dipole resonance of this deformed nucleus into two peaks was clearly resolved. The 135° differential scattering cross section has maxima at 12.49 MeV (0.35 mb/sr) and 16.50 MeV (0.45 mb/sr); a minimum occurs at 13.50 MeV (0.28 mb/sr). The observed energy dependence confirms the existence of tensor polarizability (i.e., the absorption cross section depends on the relative orientation of the nuclear spin and the photon polarization). The combination of the observed scattering and photoabsorption results can be used to test photonuclear models; the existing data suggest that it may be necessary to refine the hydrodynamic model by including zero-point vibrations. The absolute magnitude of the scattering implies that the previously reported energy-integrated absorption cross section should be reduced by 21%; this reduces the integrated sum in the giant resonance to 1.07±0.16 times the sum rule prediction without exchange forces.

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The Photodisintegration of Nuclei with Z Between 9 and 30

Cited by 19 publications

References 18 publications

Photoneutron Cross Sections forV51andCo59

Photoneutron Cross Sections forV51andCo59

Photoprotons From Oxygen, Fluorine, Neon, and Other Light Elements

Interpretation of Quasi-Elastic Scattering of 11-19 MeV Monochromatic Photons by Holmium Using Zero-Point Vibrations in the Hydrodynamic Model

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