4He + Ni elastic scattering near the Coulomb barrier and optical model parameters

Arto Nurmela (Corresponding Author), P. Pusa, E. Rauhala, J Räisänen

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

Cross sections for the elastic scattering system of 4He + Ni have been investigated. Natural nickel was bombarded by 4He ions in the laboratory energy range of 3.0 - 14.3 MeV and the intensity of helium backscattering through laboratory angles of 96º, 117º and 137º was observed. From measured yield data, the cross sections were extracted for the direct Ni(4He,4He)Ni scattering process as well as for the inverse recoil scattering process 4He(58Ni, 4He)58Ni by calculating the kinematical reversal of the reaction. The experimental helium scattering angles convert to helium recoil angles of 20º, 30º and 40º, and the incident helium ion energies to 43.5 - 207 MeV for incident 58Ni ions in the reversed reaction. Optical model parameters for helium elastic scattering were determined by using a measured scattering angular distribution at helium ion energy of 14.0 MeV and the energy distributions. These parameters were then used to calculate the elastic scattering of the 4He + Ni system for both the direct and reversed processes over the entire energy-angle plane within the energy ranges studied. Threshold energies for the 4He + Ni system above which the nuclear effects render the Rutherford cross sections invalid have been determined for the angles measured. The optical model was then again used to predict the thresholds for all scattering and recoil angles.
Original languageEnglish
Pages (from-to)2438-2442
JournalJournal of Applied Physics
Volume91
Issue number4
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

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elastic scattering
helium
scattering
helium ions
energy
cross sections
thresholds
backscattering
energy distribution
ions
angular distribution
nickel

Cite this

Nurmela, Arto ; Pusa, P. ; Rauhala, E. ; Räisänen, J. / 4He + Ni elastic scattering near the Coulomb barrier and optical model parameters. In: Journal of Applied Physics. 2002 ; Vol. 91, No. 4. pp. 2438-2442.
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title = "4He + Ni elastic scattering near the Coulomb barrier and optical model parameters",
abstract = "Cross sections for the elastic scattering system of 4He + Ni have been investigated. Natural nickel was bombarded by 4He ions in the laboratory energy range of 3.0 - 14.3 MeV and the intensity of helium backscattering through laboratory angles of 96º, 117º and 137º was observed. From measured yield data, the cross sections were extracted for the direct Ni(4He,4He)Ni scattering process as well as for the inverse recoil scattering process 4He(58Ni, 4He)58Ni by calculating the kinematical reversal of the reaction. The experimental helium scattering angles convert to helium recoil angles of 20º, 30º and 40º, and the incident helium ion energies to 43.5 - 207 MeV for incident 58Ni ions in the reversed reaction. Optical model parameters for helium elastic scattering were determined by using a measured scattering angular distribution at helium ion energy of 14.0 MeV and the energy distributions. These parameters were then used to calculate the elastic scattering of the 4He + Ni system for both the direct and reversed processes over the entire energy-angle plane within the energy ranges studied. Threshold energies for the 4He + Ni system above which the nuclear effects render the Rutherford cross sections invalid have been determined for the angles measured. The optical model was then again used to predict the thresholds for all scattering and recoil angles.",
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4He + Ni elastic scattering near the Coulomb barrier and optical model parameters. / Nurmela, Arto (Corresponding Author); Pusa, P.; Rauhala, E.; Räisänen, J.

In: Journal of Applied Physics, Vol. 91, No. 4, 2002, p. 2438-2442.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - 4He + Ni elastic scattering near the Coulomb barrier and optical model parameters

AU - Nurmela, Arto

AU - Pusa, P.

AU - Rauhala, E.

AU - Räisänen, J

N1 - Project code: zlet9124

PY - 2002

Y1 - 2002

N2 - Cross sections for the elastic scattering system of 4He + Ni have been investigated. Natural nickel was bombarded by 4He ions in the laboratory energy range of 3.0 - 14.3 MeV and the intensity of helium backscattering through laboratory angles of 96º, 117º and 137º was observed. From measured yield data, the cross sections were extracted for the direct Ni(4He,4He)Ni scattering process as well as for the inverse recoil scattering process 4He(58Ni, 4He)58Ni by calculating the kinematical reversal of the reaction. The experimental helium scattering angles convert to helium recoil angles of 20º, 30º and 40º, and the incident helium ion energies to 43.5 - 207 MeV for incident 58Ni ions in the reversed reaction. Optical model parameters for helium elastic scattering were determined by using a measured scattering angular distribution at helium ion energy of 14.0 MeV and the energy distributions. These parameters were then used to calculate the elastic scattering of the 4He + Ni system for both the direct and reversed processes over the entire energy-angle plane within the energy ranges studied. Threshold energies for the 4He + Ni system above which the nuclear effects render the Rutherford cross sections invalid have been determined for the angles measured. The optical model was then again used to predict the thresholds for all scattering and recoil angles.

AB - Cross sections for the elastic scattering system of 4He + Ni have been investigated. Natural nickel was bombarded by 4He ions in the laboratory energy range of 3.0 - 14.3 MeV and the intensity of helium backscattering through laboratory angles of 96º, 117º and 137º was observed. From measured yield data, the cross sections were extracted for the direct Ni(4He,4He)Ni scattering process as well as for the inverse recoil scattering process 4He(58Ni, 4He)58Ni by calculating the kinematical reversal of the reaction. The experimental helium scattering angles convert to helium recoil angles of 20º, 30º and 40º, and the incident helium ion energies to 43.5 - 207 MeV for incident 58Ni ions in the reversed reaction. Optical model parameters for helium elastic scattering were determined by using a measured scattering angular distribution at helium ion energy of 14.0 MeV and the energy distributions. These parameters were then used to calculate the elastic scattering of the 4He + Ni system for both the direct and reversed processes over the entire energy-angle plane within the energy ranges studied. Threshold energies for the 4He + Ni system above which the nuclear effects render the Rutherford cross sections invalid have been determined for the angles measured. The optical model was then again used to predict the thresholds for all scattering and recoil angles.

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