Evidence for a real tensor potential in the inelastic scattering of 800 mev polarized protons from20ne using the dirac phenomenology

Pham, D. L.; Swiniarski, R. de

doi:10.1007/bf01289345

Cited by 1 publication

(3 citation statements)

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“…The tensor potential, which has been found to be very small compared to the scalar or vector terms has been neglected in (1) at least in the initial search procedure. We confirm this observation from the present study presented in this paper, where indeed the tensor term has been found to have a negligible effect on the data but with the exception however for the 2~ nucleus where the presence of such an UT term was required to improve substantially the fits to 800 MeV polarized protons scattering data mainly for Ay(O) for the 0 +, 2 +, 4 + states [13] in this nucleus. All data (a(0) and Ay(O)) were analyzed in the same way.…”

Section: U= Ur F (R R R A)+ I Ui F (R R I Ai)supporting

confidence: 92%

“…Moreover these CC Schr6dinger equation calculations have shown that the actual value of/?6 has little if not no effect on the measured 0 + -2 + -4 + cross-sections as was presented by Blanpied et al [ 11] for 2~ and Recently however, a reanalysis of the cross-sections and analyzing powers data for inelastic scattering of 800 MeV protons from the 0 + -2 + -4 + states of the K= 0 + band in 2~ in the framework of the CC formalism using the newly Dirac phenomenology has shown surprisingly clear evidence for a large /36 in the ground state of 2~ (/36 = -0.12) in good agreement with the former low energy results (Ep= 24.5 MeV) but in disagreement with the Schr6dinger CC analysis for these 800 MeV protons data [13].…”

Section: Pacsmentioning

confidence: 55%

“…Some of the results for 2~ have already been recently published [13] in details and therefore will not be repeated here. The data for 22Ne (p,p') (only cross-sections for the 0 +, 2+,4 + states) have been analyzed in a similar way to that for 2~ starting from the best parameters obtained for this last nucleus.…”

Section: One _ 22nementioning

confidence: 94%

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Comparison of higher order deformations in severals-d shell nuclei obtained through Schrödinger or Dirac coupled-channel analysis of 800 MeV polarized protons inelastic scattering experiments

Swiniarski

Pham

Raynal

1992

Z. Physik A - Hadrons and Nuclei

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Cross-sections and analyzing powers data obtained by inelastic scattering of 800 MeV polarized protons from several s-d shell nuclei have been analyzed using the Dirac coupled-channel (CC) formalism putting emphasis in the precise determination of higher order deformation in these nuclei. The superiority of the Dirac formalism compared to the classical Schr6dinger CC calculations in the analysis of these data was once more clearly established. The higher order deformations obtained through these calculations are compared to those obtained using the classical Schr6dinger equation. 25.40.Ep PACS:The precise determination of the shape of a nucleus remains a difficult problem. This is particularly true for the determination of the nuclear deformation, a specific property of the shape of nuclei; such a determination has indeed been the subject of many experiments as well as theoretical investigations since several years [ 1,2]. A standard technique for investigating nuclear shape and therefore nuclear deformation is the measurement of inelastic cross-sections as was first suggested by Barret [3]. Indeed, analysis of inelastic cross-sections by means of the deformed optical model potential (DOMP) in the coupledchannel (CC) formalism has been proved to be a powerful tool for the determination of higher order deformation as was first demonstrated for rare earth nuclei by Hendrie et al.[4] using 50 MeV ~ particles.These experiments have for the first time clearly demonstrated the existence of some hexadecapole deformation (/?4) in the equilibrium shape of rare earth nuclei, whose value ranges from + 0.04 for 152Sm to -0.06 for [78Hf, deformation which is added to the usual quadrupole deformation /?2. Subsequently, inelastic scattering experiments with protons [5], alpha particles [6], electrons [7] or polarized low energy protons [8], analyzed through the DOMP indicated also the presence of a large /?4 term in the shape of several 2s-1 d shell nuclei.In particular, the analysis of 24.5 MeV polarized protons inelastic scattering from 2~ has revealed the existence in the equilibrium shape of this nucleus of a value of /84 which is the largest f14 deformation (fl4=0.28) found in the literature as well as the need for a large negative deformation B6 =-0.10 (called hexakontattetara deformation [1]) to match the magnitude of the measured cross-section for the 6 + state at 8.79 MeV [9]. However, this large/76 deformation found some time ago in 2~ was never confirmed until recently either by experiment or theoretical calculations based on Schr6dinger type calculations and no large/?6 was either reported for other s-d shell nuclei.In the actinide region, the first inelastic scattering experiment using 50 MeV 0~ particles [4] has clearly shown the need for a small/?6 term roughly constant form ~SaSm to 178Hf (I/761 G0.02) together with the /?4 term (I/741 G0.06) to reproduce the measured cross-section which includes the cross-section for the 6 + state.Recently, a large amount of inelastic polarized proton scattering data at Ep = 80...

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Section: U= Ur F (R R R A)+ I Ui F (R R I Ai)supporting

confidence: 92%

Section: Pacsmentioning

confidence: 55%