Origin of the structures in the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">C</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>12</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mo>(</mo><mrow><mmultiscripts><mrow><mi mathvariant="normal">O</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>16</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mo>,</mo><mi>α</mi><mo>)</mo></math> reaction: Dominance of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Ne</mi></mrow><mrow></mrow><mrow><mo>*</mo></mrow><mrow></mrow><mrow></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>20</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">O</mi></mrow><mrow></mrow><mrow><mo>*</mo></mrow><mrow></mrow><mrow></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>16</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> sequential <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>α</mi></math>-decay processes

T. Murakami; E. Ungricht; N. Takahashi; Y.-W. Lui; Y. Mihara; R. E. Neese; E. Takada; D. M. Tanner; R. E. Tribble; K. Nagatani

doi:10.1103/PhysRevC.29.847

Origin of the structures in the ${}^{12}C ({}^{16}O, α)$ reaction: Dominance of ${}^{20}{Ne}^{}$ and ${}^{16}O^{}$ sequential $α$ -decay processes

T. Murakami, E. Ungricht, N. Takahashi, Y.-W. Lui, Y. Mihara, R. E. Neese, E. Takada, D. M. Tanner, R. E. Tribble, and K. Nagatani

Phys. Rev. C 29, 847 – Published 1 March 1984

Abstract

A series of experiments was carried out on the ${}^{12}C ({}^{16}O, α)$ reaction to search for the population of molecular resonances as final state interactions. Contrary to our expectation, no positive evidence was found in $α - {}^{12}C$ coincidence measurements for molecular states. The experimental configuration was arranged to selectively observe events corresponding to decays into the ${}^{12}C$ + ${}^{12}C$ resonance channel. A study of the incident energy dependence of the ${}^{12}C ({}^{16}O, α)$ reaction clearly indicates the importance of sequential processes in the $α$ -particle yield. In particular, the process where the incident ${}^{16}O$ picks up an $α$ forming ${}^{20}{Ne}^{*}$ resonances and then decays back to $α + {}^{16}O$ can reasonably explain most of observed structures in the inclusive $α$ spectra. The sequential process caused by the inelastic excitation of ${}^{16}O$ to ${}^{16}O^{*} \to α + {}^{12}C$ can also contribute to the broad peaks observed in the inclusive spectra, but only in the high excitation region.

Received 29 August 1983

DOI:https://doi.org/10.1103/PhysRevC.29.847

Authors & Affiliations

T. Murakami^*, E. Ungricht^†, N. Takahashi^‡, Y.-W. Lui, Y. Mihara^§, R. E. Neese, E. Takada^∥, D. M. Tanner, R. E. Tribble, and K. Nagatani^*

Cyclotron Institute, Texas A&M University, College Station, Texas 77843

^*Present address: Institute for Nuclear Study, University of Tokyo, Tokyo 188, Japan.
^†Present address: Argonne National Laboratory, Argonne, IL 60439.
^‡Present address: Department of Physics, University of Tokyo, Tokyo 113, Japan.
^§Permanent address: Department of Physics, Tokyo Institute of Technology, Tokyo 152, Japan.
^∥Present address: Physics Department, National Laboratory for High Energy Physics, Tsukuba, Ibaraki 305, Japan.

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Vol. 29, Iss. 3 — March 1984

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