Charged particle decay of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>28</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>giant electric dipole resonance

Gulbranson, R. L.; Cardman, L.; Doron, A.; Erell, A.; Lindgren, Kristian; Yavin, A. I.

doi:10.1103/physrevc.27.470

Cited by 18 publications

(8 citation statements)

References 28 publications

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“…All the distributions show a similar peak centered at about 18 MeV with a relatively narrow width of about 7 MeV. These values can be compared with the peak position (20 MeV) and width (4.5 MeV) of the giant dipole resonance in 2sSi as determined in the (p, p) reaction [15,16]. It should be noted that in the electromagnetic excitation process, the virtual photon spectrum is not uniform and tends to excite the low end of the GDR distribution preferentially.…”

Section: Event Reconstructionmentioning

confidence: 74%

“…To do so, we use the available data on the~sSi(p, p) 27A1 reaction [15,16] and combine it with a WW photon spectrum to predict the results expected in our experiment. The simulation program assumes that the excitation proceeds through virtual photons with a WW spectrum.…”

Section: /3 1/3mentioning

confidence: 99%

“…The simulation program assumes that the excitation proceeds through virtual photons with a WW spectrum. It uses experimental (y, p) cross sections for Si measured up to E~= 26.0 MeV, and takes into account the decay to excited states of Al up to an energy of 4.5 MeV [15], as follows. The (p, p) cross sections as a function of E~f or each state in Al are first multiplied by the virtual photon spectrum to obtain effective final-state yields as a function of photon energy.…”

Section: /3 1/3mentioning

confidence: 99%

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Electromagnetic dissociation of relativisticSi28intop+27<

Barrette¹,

Bellwied²,

Braun‐Munzinger³

et al. 1992

Phys. Rev. C

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We report a direct measurement of the final-state energy spectrum in the electromagnetic dissociation of Si into p+ Al at an energy of 14.6 GeV/nucleon. The final-state energy is obtained through a calculation of the p-Al invariant mass in kinematically reconstructed events. The finalstate energy spectrum for all targets is peaked near the isovector giant-dipole resonance in Si and the dependence of the magnitude of the cross section on target charge confirms that the excitation is largely electromagnetic.By exploiting the expected scaling behavior on target Z and A, the background from nuclear interactions is evaluated and subtracted, leaving a pure electromagnetic dissociation final-state energy distribution. This distribution is well reproduced by simulated events, in which the photon spectrum calculated in the Weiszacker-Williams approximation is combined with experimental data on the photonuclear reaction Si(7, p) Al, and slight differences are observed only at low final-state energy.PACS number(s): 25.75.+r ') Present address:

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Section: Event Reconstructionmentioning

confidence: 74%

Section: /3 1/3mentioning

confidence: 99%

Section: /3 1/3mentioning

confidence: 99%

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Electromagnetic dissociation of relativisticSi28intop+27<

Barrette¹,

Bellwied²,

Braun‐Munzinger³

et al. 1992

Phys. Rev. C

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“…Figure 3 indicates the existence of a correlation between the peak energies in the (γ , abs) and (γ, p 0 ) reactions. The peak energies deduced from the data by Singh et al 5) are also shown in 14) and 28 Si(γ , n) 15) data, in which the energy shift of about 150 keV was reported relative to the previous (γ , abs) data. The intermediate fourpeak structures in 28 Si agree well with each other for the (γ, p), (γ, n), and (γ , abs) reactions.…”

Section: Methodsmentioning

confidence: 85%

Fine Structure of Giant Resonance in the²⁸Si(γ, abs) Reaction

Harada¹,

Furutaka²,

Ohgaki

et al. 2001

Journal of Nuclear Science and Technology

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The photo-absorption cross section for 28 Si has been measured in the energy range 17.5-21.5 MeV, using a highresolution high-energy photon spectrometer and laser Compton photons. Four intermediate structure peaks in the giant dipole resonance of 28 Si have been resolved into about thirty fine-structure peaks. The comparison of the observed structure with those in (γ, p 0 ) and (γ, n 0 ) reactions shows that the energies of the fine structure peaks in (γ , abs) reaction have a correlation with those in both of the (γ, p 0 ) and (γ, n 0 ) reactions. 465(BGO) anti-coincidence shields. The experimental arrangement is described in Refs. 1) and 2). A natural silicon target (92.18% in 28 Si) was used of the thickness 137.4 g/cm 2 . After the measurement of the 28 Si target, the energy distribution of the LCP beam was measured with a blank target instead of the 28 Si target.The photon energy was calibrated with a 60 Co source (E γ =1.173 and 1.333 MeV) and the 15.11 MeV peak in 13 C. 1) The error in E γ was estimated as less than 0.1% for the energy of about 20 MeV. The LCP beam was obtained using a CW Nd:YVO 4 laser beam (λ=532 nm and the power 1-5 W) and the electron storage ring TERAS. 11) The energy of the stored electron beam was 793 MeV and the stored current was 5-120 mA. The lead collimator of 150 mm in length with a hole of 4.0 mmφ was placed along the LCP beam axis to cut off the low energy tail of the LCP beam. Figure 1 shows the transmitted-photon spectra, Y( 28 Si) (•) and Y(blank) (•), of the HHS for the 28 Si and blank targets, respectively. Many absorption dips are shown in the Y( 28 Si) spectrum, whereas there is no significant absorption dip in the Y(blank) spectrum. This means the absorption dips originate in the photo-absorption by the 28 Si target. The (γ , abs) cross section is given by III. Results and Discussionwhere ρ and l mean the atomic density and the length of the 28 Si target. The U and U 0 are obtained by unfolding the observed spectra Y( 28 Si) and Y(blank), respectively, with the response functions 10) of HHS calculated using the EGS4 simulation code. 12) The c in Eq. (1) is a normalization constant for the observed spectrum for the blank target. The σ atom (E γ ) is the photo-atomic cross section that is well known to have smooth energy dependence and tabulated. 13) The (γ , abs) cross section for 28 Si obtained in the present experiments is shown as a function of excitation energy by the closed circles in Fig. 2. The cross section includes "contami-

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“…by emitting either a 2, ray or a nucleon. The EMD cross section in the WW approximation can be given by where ,., is the virtual photon frequency, 7_(_') is the virtual photon flux integrated over all the impact parameters at a given photon energy and a(_,) is the photonuclear cross section which can be found in the literature [12,13,14]. It can be shown that in a collision with impact parameter b, the virtual photon spectrum contains photons with energies up to a maximum value given by E'_ _ _ 7(hc/bmin), implying that for a given impact parameter, only excita.tions up to a certain value can be rea.ched.…”

Section: Dissociation 1 Equivalent Photon Methodsmentioning

confidence: 99%

Electromagnetic dissociation of relativistic [sup 28]Si by nucleon emission

Sonnadara¹

1992

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Charged particle decay of theSi28giant electric dipole resonance

Cited by 18 publications

References 28 publications

Electromagnetic dissociation of relativisticSi28intop+27<

Electromagnetic dissociation of relativisticSi28intop+27<

Fine Structure of Giant Resonance in the²⁸Si(γ, abs) Reaction

Electromagnetic dissociation of relativistic [sup 28]Si by nucleon emission

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Charged particle decay of theSi28giant electric dipole resonance

Cited by 18 publications

References 28 publications

Electromagnetic dissociation of relativisticSi28intop+27<

Electromagnetic dissociation of relativisticSi28intop+27<

Fine Structure of Giant Resonance in the28Si(γ, abs) Reaction

Electromagnetic dissociation of relativistic [sup 28]Si by nucleon emission

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Fine Structure of Giant Resonance in the²⁸Si(γ, abs) Reaction