Polarization and Cross-Section Measurements for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>−</mml:mo><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>Elastic Scattering Between 20 and 45 MeV

Bacher, A.D.; Plattner, G.R.; Conzett, H.E.; Clark, D.J.; Grunder, Hermann A.; Tivol, William F.

doi:10.1103/physrevc.5.1147

Cited by 31 publications

(9 citation statements)

References 18 publications

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“…Although Ref. 20 contains most of the details of the standard experimental procedure, a brief summary is presented here for completeness. The incident beam energy was determined by momentum analysis through a 110 ~ bending magnet.…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

“…The protons scattered from helium were detected at angles corresponding to maximum analyzing efficiency that is 114 ~ to 117 ~ for energies of 25 MeV or higher, and 75.6 ~ for energies below 25 MeV. The analyzing power of helium was known with great detail from recent accurate measurements [20]. Typical beam polarizations were between 75 and 85 %.…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

“…The polarized proton beam facility of the Berkeley 88-inch cyclotron [20] was used to measure relative cross sections and asymmetries in the scattering from Si at 2MeV intervals from 17 to 29MeV inclusive. The natural Si target (92.2% of 28Si) was prepared from crystalline high purity material, and the thickness was determined to be 6.5_+0.2mgcm 2 using a method of c~-particle transmission using a source of 241Am.…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

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The $$\overrightarrow p - Si$$ elastic scattering in the region of giant multipole resonances

et al. 1980

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Section: Experimental Details and Resultsmentioning

confidence: 99%

Section: Experimental Details and Resultsmentioning

confidence: 99%

Section: Experimental Details and Resultsmentioning

confidence: 99%

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The $$\overrightarrow p - Si$$ elastic scattering in the region of giant multipole resonances

et al. 1980

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“…The 2n-p potential was assumed to be the same as for d -p. The parameters of the optical potentials U 2n−p and U 4 He−p , listed in Table II, were obtained by fitting the elastic scattering data of deuterons and alpha particles from protons at the required energy [26,27]. The results of the CDCC calculations for the 6 He+p elastic scattering, performed using version FRXY-1c of the code FRESCO [28], are plotted in Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

Investigation ofHe6cluster structures

Giot

Roussel‐Chomaz²,

Demonchy³

et al. 2005

Phys. Rev. C

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The α+2n and t+t clustering of the 6 He ground state were investigated by means of the transfer reaction 6 He(p,t) 4 He at 25 MeV/nucleon. The experiment was performed in inverse kinematics at GANIL with the SPEG spectrometer coupled to the MUST array. Experimental data for the transfer reaction were analyzed by a DWBA calculation including the two neutrons and the triton transfer. The couplings to the 6 He → 4 He + 2n breakup channels were taken into account with a polarization potential deduced from a coupled-discretized-continuum channels analysis of the 6 He+ 1 H elastic scattering measured at the same time. The influence on the calculations of the α+t exit potential and of the triton sequential transfer is discussed. The final calculation gives a spectroscopic factor close to one for the α+2n configuration as expected. The spectroscopic factor obtained for the t+t configuration is much smaller than the theoretical predictions.

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“…Around 30-40 MeV the variation of I can be linked to the structure observed in the d- 3 He elastic scattering. 19 In the intermediate region, 156 MeV^ T p ^500 MeV (168 MeV/c ^P c#m . < 800 MeV/c), the slope is close to zero, which seems to be supported by the preliminary data of Cameron et at.…”

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Sharp Backward Peak inp-He4Elastic Scattering at 1.05 GeV

et al. 1978

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p-^Ue elastic scattering has been measured at 1.05-GeV incident proton energy, close to 180° in the center of mass. The steep backward peak observed at lower energies is still present, but its slope appears to decrease.Our previous results on elastic p-4 H.e scattering at intermediate energies and at angles close to 180° in center-of-mass system revealed the occurrence of a sharp rise in the differential cross section, which became steeper as the energy increased. 1 Various theoretical models have tried to explain this backward peak by either actual nucleon-nucleon interaction in a noneikonal scattering approach, 2 or triton exchange, 3 " 1 or addition of an exchange term in a Glauber model. 6 The data in Ref. 1 were acquired with incident a particles on a hydrogen target to take advantage of the wide coverage of the kinematics: The scattered a's are fast and confined into a cone 14.6° wide. At the higher energy, when cross sections fall to the nanobarn/steradian level, background problems associated with the emptytarget effect become important. However, a useful coverage of the interesting region close to 180° in the cm. system can still be obtained by returning to the more classical method of using a proton beam and a liquid-helium target. Indeed, around 1-GeV proton kinetic energy and above, the a's recoiling from backscattering protons have enough energy to be detected with full efficiency in our spectrometer. Besides, the higher intensity of the proton beam could offset to a certain extent the decrease in cross section. When tried, this method displayed very little background associated with the walls of the target Except for the installation of a liquid helium target, and the use of a proton beam, the apparatus was the same double-focusing spectrometer used in Ref c 1 and described in detail elsewhere. 7 The fact that the recoiling 4 He is detected ensures the elastic character of the reaction The differential cross sections in the cm c system are presented in Fig 0 1, as a function both of c°s #c* m . an< 3 °f * ne invariant quantity u -u rmxo The numerical values are listed in Table I. It is noteworthy to point out that the smallness of the background has allowed us to make a measurement at # Cem . =180°.We show in Fig 0 2 the present data with our earlier results at different energies. 1 ' 8 The results of Comparat et ah 9 at 156 MeV and of Aslanides et al. 10 at 1.05 GeV are also shown. The cross sections are given as a function of t 0 In the following, when comparing different experiments, we will use in the case of incident a particles the equivalent proton laboratory kinetic energy (i.e., giving for pa scattering the same c.m c energy as in ap case); when needed, the cm. momentum will be also given. One can note in Fig. 2 that a sharp peak exists near 180° in the cm. system except at 198 and 438 MeV. Outside the backward region, do/dt is to a large extent energy invariant, as confirmed also by the results at 788 MeV, 11 and it can be described by Glauber-like 12 ' 13 models.At the intermediate energi...

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Polarization and Cross-Section Measurements forp−He4Elastic Scattering Between 20 and 45 MeV

Cited by 31 publications

References 18 publications

The $$\overrightarrow p - Si$$ elastic scattering in the region of giant multipole resonances

The $$\overrightarrow p - Si$$ elastic scattering in the region of giant multipole resonances

Investigation ofHe6cluster structures

Sharp Backward Peak inp-He4Elastic Scattering at 1.05 GeV

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