E1 and E2 cross sections of the C12(α,γ0)O16 reaction using pulsed α beams

H. Makii, Y. Nagai, T. Shima, M. Segawa, K. Mishima, H. Ueda, M. Igashira, and T. Ohsaki
Phys. Rev. C 80, 065802 – Published 3 December 2009

Abstract

We measured the γ-ray angular distribution from C12(α,γ0)O16 to the ground state of O16 using a pulsed α beam at Eeff=1.6 and 1.4 MeV. True events of C12(α,γ0)O16 were discriminated from background events with a time-of-flight method because of neutrons from C13(α,n)O16. The obtained γ-ray spectrum with anti-Compton NaI(Tl) spectrometers showed a characteristic line shape from C12(α,γ0)O16: the Doppler broadening and energy loss of α particles in C12 targets. A Rutherford backscattering spectrum of α particles from enriched C12 targets was measured during beam irradiation to obtain the target thickness and incident α-beam intensities. The astrophysical S factors for E1 and E2,SE1(γ0:Eeff) and SE2(γ0:Eeff), derived from the present cross sections are in excellent agreement with the values derived by R-matrix calculation of the β-delayed α spectrum of N16, and by using the asymptotic normalization constant in the R-matrix fit.

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  • Received 3 February 2009

DOI:https://doi.org/10.1103/PhysRevC.80.065802

©2009 American Physical Society

Authors & Affiliations

H. Makii1,*, Y. Nagai1, T. Shima1, M. Segawa1,†, K. Mishima1,‡, H. Ueda1,§, M. Igashira2, and T. Ohsaki2,∥

  • 1Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
  • 2Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan

  • *Present address: Advanced Science Research Center, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan.
  • Present address: Quantum Beam Science Directorate, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan.
  • Present address: Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
  • §Present address: Nippon Advanced Technology Corporation, Tokai, Ibaraki 319-1112, Japan.
  • Present address: Intellectual Property Bank Corporation, Minato, Tokyo 105-0001, Japan.

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Issue

Vol. 80, Iss. 6 — December 2009

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