A simple beam-energy measurer for heavy ions

Olsen, D.K.; Merrill, N.H.; Biagi, S.; Phillips, W. R.; Barnett, A.R.

doi:10.1016/0029-554x(74)90189-x

Cited by 14 publications

(3 citation statements)

References 2 publications

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“…The data deduced from the magnetic measurements were in agreement with the energy values that could be deduced from the RF and the extracting radius in the cyclotron. In order to verify those energy measurements, a new technique has been developed in the laboratory [4], after its proposal by Olsen et al [5]. It consists in the energy measurement with a solid state detector of protons projected at zero degree after the collision between heavy ions and hydrogen nuclei of a thin formvar target.…”

Section: Experimental Techniquesmentioning

confidence: 99%

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Mechanism of formation and decay of the compound nuclei150Gd produced by two entrance channels (16O+134Ba) and (40Ar+110Pd)

et al. 1977

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Excitation functions have been drawn for evaporation residues issued from 15~ a compound nucleus produced either by 160 ions on 13~Ba, or by 4~ on 1 lOpd" Absolute cross sections were measured for 145-~47Gd,~45-~47Eu, 14~"8m, 143"Sm, ~4~ and 39raNd" Complete fusion cross sections have been obtained and compared to calculated estimations based, at low energies, on the simple expression aCF = ~R~u~ (1 -V~) where dV eFu s and VFu ~ are respectively the distance and the potential for fusion at ~-r =0. For high energies O-cF--/~Rcr 1--with the model of critical distance Rcr and critical potential Vor. Thresholds energies have been determined with a particular care. The analysis of the shape and the width of excitation functions, particularly for the emission of 4 and 5 neutrons, has been carried out and compared to calculated values. The difference between argon and oxygen induced reactions has been attributed to the difference in 1 population in the entrance channel.

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Section: Experimental Techniquesmentioning

confidence: 99%

“…/fxas ac F = n;~2= 0( 21 + 1) = ~2 (/rus + 1) 2 (5) where leush is the limit in the angular momentum population above which complete fusion does not occur. For low energies, this limit is close to lmaxh, …”

Section: B) Complete Fusion Cross Sectionmentioning

confidence: 99%

Mechanism of formation and decay of the compound nuclei150Gd produced by two entrance channels (16O+134Ba) and (40Ar+110Pd)

et al. 1977

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“…Principe de la mesure. -Cette méthode de l'énergie des ions lourds a été indiquée par D. K. Olsen et al [1]. Son principe est de mesurer l'énergie des protons projetés à zéro degré par collision élastique des ions du faisceau avec une cible de formvar (CSH1002)' Le détecteur utilisé est une jonction Si(Li) de 3 à 5 mm d'épaisseur.…”

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Mesure de l'énergie des ions lourds par la méthode des protons projetés

Bimbot

Negra

Gauvin

et al. 1978

Rev. Phys. Appl. (Paris)

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Un dispositif destiné à la mesure de l'énergie des faisceaux d'ions lourds de 3 à 6 MeV/ uma a été construit. Le principe de la méthode est de mesurer l'énergie des protons projetés à zéro degré par collision élastique des ions incidents avec les noyaux d'hydrogène d'une cible de formvar. L'incertitude calculée sur l'énergie ainsi mesurée pour les ions lourds est de + 0,45 %. Des mesures faites sur des faisceaux de 19F et 40Ca d'énergie bien connue, accélérés par un Tandem MP, ont montré un écart maximum de 0,3 % entre les énergies réelles et mesurées. Le dispositif permet de contrôler ou calibrer des méthodes plus lourdes de détermination de l'énergie des ions lourds : déviation magnétique, temps de vol. Il se prête particulièrement bien à la mesure des pertes d'énergie d'ions lourds dans des ralentisseurs solides

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