Determination of the $E1$ component of the low-energy $^{12}\mathrm{C}$($\ensuremath{\alpha},\ensuremath{\gamma}$)$^{16}\mathrm{O}$ cross section

Determination of the $E 1$ component of the low-energy ${}^{12}C$ ( $α, γ$ ) ${}^{16}O$ cross section

X. D. Tang, K. E. Rehm, I. Ahmad, C. R. Brune, A. Champagne, J. P. Greene, A. Hecht, D. J. Henderson, R. V. F. Janssens, C. L. Jiang, L. Jisonna, D. Kahl, E. F. Moore, M. Notani, R. C. Pardo, N. Patel, M. Paul, G. Savard, J. P. Schiffer, R. E. Segel, S. Sinha, and A. H. Wuosmaa

Phys. Rev. C 81, 045809 – Published 29 April 2010

Abstract

A measurement of the $β$ -delayed $α$ decay of ${}^{16}N$ using a set of twin ionization chambers is described. Sources were made by implantation, using a ${}^{16}N$ beam produced via the In-Flight Technique. The energies and emission angles of the ${}^{12}C$ and $α$ particles were measured in coincidence and very clean $α$ spectra, down to energies of $450$ keV, were obtained. The structure of the spectra from this experiment is in good agreement with results from previous measurements. An analysis of our data with the same input parameters as used in earlier studies gives $S_{E 1} (300) = 86 \pm 22$ keVb for the $E 1$ component of the $S$ -factor. This value is in excellent agreement with results obtained from various direct and indirect measurements. In addition, the influence of new measurements including the phase shift data from Tischhauser et al. on the value of $S_{E 1} (300)$ is discussed.

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Received 30 December 2009

DOI:https://doi.org/10.1103/PhysRevC.81.045809

Authors & Affiliations

X. D. Tang^1,2, K. E. Rehm¹, I. Ahmad¹, C. R. Brune³, A. Champagne⁴, J. P. Greene¹, A. Hecht¹, D. J. Henderson¹, R. V. F. Janssens¹, C. L. Jiang¹, L. Jisonna⁵, D. Kahl^1,*, E. F. Moore¹, M. Notani^1,†, R. C. Pardo¹, N. Patel^1,6, M. Paul⁷, G. Savard¹, J. P. Schiffer¹, R. E. Segel⁵, S. Sinha^1,‡, and A. H. Wuosmaa⁸

¹Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
²University of Notre Dame, Notre Dame, Indiana 46556, USA
³Ohio University, Athens, Ohio 45701, USA
⁴University of North Carolina, Chapel Hill, North Carolina 27599, USA
⁵Northwestern University, Evanston, Illinois 60208, USA
⁶Colorado School of Mines, Golden, Colorado 80401, USA
⁷Racah Institute of Physics, Hebrew University, Jerusalem, 91904, Israel
⁸Western Michigan University, Kalamazoo, Michigan 49008, USA

^*Present address: Center for Nuclear Study (CNS), the University of Tokyo, Japan.
^†Present address: University of Notre Dame, Notre Dame, Indiana, USA.
^‡Present address: University of California, Davis, California, USA.

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Vol. 81, Iss. 4 — April 2010

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Physical Review C

covering nuclear physics

Determination of the $E 1$ component of the low-energy ${}^{12}C$ ( $α, γ$ ) ${}^{16}O$ cross section

X. D. Tang, K. E. Rehm, I. Ahmad, C. R. Brune, A. Champagne, J. P. Greene, A. Hecht, D. J. Henderson, R. V. F. Janssens, C. L. Jiang, L. Jisonna, D. Kahl, E. F. Moore, M. Notani, R. C. Pardo, N. Patel, M. Paul, G. Savard, J. P. Schiffer, R. E. Segel, S. Sinha, and A. H. Wuosmaa

Phys. Rev. C 81, 045809 – Published 29 April 2010

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Physical Review C

covering nuclear physics

Determination of the E1 component of the low-energy C12(α,γ)O16 cross section

X. D. Tang, K. E. Rehm, I. Ahmad, C. R. Brune, A. Champagne, J. P. Greene, A. Hecht, D. J. Henderson, R. V. F. Janssens, C. L. Jiang, L. Jisonna, D. Kahl, E. F. Moore, M. Notani, R. C. Pardo, N. Patel, M. Paul, G. Savard, J. P. Schiffer, R. E. Segel, S. Sinha, and A. H. Wuosmaa

Phys. Rev. C 81, 045809 – Published 29 April 2010

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Determination of the $E 1$ component of the low-energy ${}^{12}C$ ( $α, γ$ ) ${}^{16}O$ cross section