Optical-model analysis of the scattering of protons from 4He at 31, 40, 46 and 55 MeV

Thompson, G.E.; Epstein, M. B.; Sawada, Tatsuro

doi:10.1016/0375-9474(70)90813-4

Cited by 44 publications

(10 citation statements)

References 6 publications

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“…1). The extracted SF ( -1.0) is also in good agreement with the theoretical prediction of 0.93 [6]. The uncertainty of the optical potential parameters contributes -15% in the value of the SF.…”

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confidence: 78%

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Distorted-wave analysis of proton scattering fromLi6near the α-dbreakup threshold

et al. 1993

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The Li(p, p') continuum data at E~= 65 MeV were reanalyzed in the framework of the distorted-wave impulse approximation and the distorted-wave Born approximation.This provides an analysis consistent with the Li(o:, a') work at E = 50 MeV and reconfirms an earlier observation that the Li target breakup data, studied at low relative fragment energies, indicate a change in the reaction mechanism below a critical transfer of momentum. This is possibly due to the recombination of the breakup fragments, an eFect which should be seriously considered in the analysis of all the breakup reaction data measured at low relative fragment energies. PACS number(s): 25.40.Ep, 25.55.Ci Recently, the continuum spectra near the a-d breakup threshold were studied through the Li(p, p') and Li(a, a') reactions at E =65 and 80 MeV [1] and E =50 MeV [2]. In these experiments, by choosing a fixed continuum region near the e-d breakup threshold, itwas possible to investigate the Li target breakup reaction at low relative fragment energies. From a comparison of the proton and alpha-particle induced data, it was suggested [2] that possibly a change in the reaction mechanism occurs under the condition of low relative energies of the breakup fragments when the transfer of momenturn from the projectile falls below a critical value. This could be due to a strong final-state interaction leading to recombination of fragments which effectively changes the three-body final state to a two-body one at low relative fragment energies.The Li(a, tz') continuum data at E = 50 MeV were initially analyzed [2] in the framework of a plane-wave impulse approximation (PWIA) and also, to include the effects of the final-state interaction (FSI), in terms of a distorted-wave impulse approximation (DWIA) assuming a quasifree (QF) reaction mechanism leading to a threebody final state. The impulse approximation calculations were found to be inadequate at the forward angles where the calculated cross sections showed a steep rise in contrast to the experimental data. The DWIA code used in the analysis included most of the FSI except recombination. As a first attempt to understand the effect of recombination in the Li(ct, a') reaction, a simple phenomenological distorted-wave Born approximation (DWBA) calculation was carried out taking a virtual state (1+, 1.475 MeV) excitation at the a-d breakup threshold. It was found that although the DWBA calculations for a twobody final state failed to account for the angular distribution, they produced a reduction of the cross section at the forward angles. In order to arrive at any definite conclusion about the reaction mechanism it is essential that both the (a, ct') and the (p, p') continuum data be analyzed identically in a consistent manner. Qnly a PWIA analysis has so far been carried out for the (p, p') continuum data [1]. In this work we report the results of a DWIA and DWBA analysis of the Li(p, p') continuum data at E =65 MeV.The DWIA calculations were carried out using the THREEDEE code of Chant. In this calculation, ...

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supporting

confidence: 78%

“…For the Li(p, p'd) He reaction in the p + He exit channel we used the optical potential parameter of Ref. [6] ( Table I). The bound state wave function was taken to be the same as used in the (a, a') work [2] for a consistent analysis.…”

mentioning

confidence: 99%

Distorted-wave analysis of proton scattering fromLi6near the α-dbreakup threshold

et al. 1993

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“…Whether or not the repulsive core is present between the proton and alpha particle when being scattered by each other should be clarified also using independent source of information (see e.g. [21,24,25,26,27]). Table 4: Inversion results of the experimental p − α data at E lab = 17.45 MeV.…”

Section: Conclusion Summarymentioning

confidence: 99%

Development of a Cox–Thompson inverse scattering method to charged particles

Palmai¹,

Apagyi²,

Scheid³

2010

J. Phys. G: Nucl. Part. Phys.

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Cox-Thompson fixed-energy quantum inverse scattering method is developed further to treat long range Coulomb interaction. Depending on the reference potentials chosen, two methods have been formulated which produce inverse potentials with singular or finite value at the origin. Based on the quality of reproduction of input experimental phase shifts, it is guessed that the p − α interaction possesses an interesting repulsive hard core.

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“…Fig. 11 shows the p-4He elastic cross section, measured at the same centre-of-mass energy by Thompson et al [53].…”

Section: Alpha Scattering To Low-lying Statesmentioning

confidence: 99%

“…Elastic proton-4He scattering cross section at 31 MeV from Ref. [53]. The solid line represents a fit with a complex 3-Yukawa t-matrix without exchange term.…”

Section: Alpha Scattering To Low-lying Statesmentioning

confidence: 99%

Localized 1ħω particle-hole strength in nuclei

et al. 1995

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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. AbstractA cross section enhancement, persisting to high momentum transfer, has been observed around l hto in excitation energy in spectra from inelastic proton-, alpha-and electron scattering on 9°Zr, ll6Sn, 196pt and 2°spb. Data are presented for (p,p') at 201 MeV, (a,a') at 120 MeV and analyzed together with existing data obtained with 133.8 MeV polarized (l~,p') on 116Sn and electron-scattering data on Ll6Sn and ~96pt. Two different interpretations of the observed enhancement are discussed: that of the incoherent sum of all 1 hto cross section and alternatively the sum over the isoscalar normal modes of all multipolarities.Keywords: NUCLEAR REACTIONS 9°Zr, ll6Sn, 196pt, 2°spb (p,pt), E = 201 MeV; ll6Sn (polarized p,p'), E = 133.8 MeV; 9°Zr, ll6Sn, 196pt (~t, ctt), E = 120 MeV; measured o-(0), ll6Sn, 196pt (e,e~), E = 278, 333 MeV; measured form factors. 9°Zr, ll6Sn, 196pt, 2°Spb deduced 0, lhto strength distribution. DWBA calculation and effective NN-foree. A. Hofstee et al./Nuclear Physics A 588 (1995)

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Optical-model analysis of the scattering of protons from 4He at 31, 40, 46 and 55 MeV

Cited by 44 publications

References 6 publications

Distorted-wave analysis of proton scattering fromLi6near the α-dbreakup threshold

Distorted-wave analysis of proton scattering fromLi6near the α-dbreakup threshold

Development of a Cox–Thompson inverse scattering method to charged particles

Localized 1ħω particle-hole strength in nuclei

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