In-medium [Formula Presented] spectral function study via the [Formula Presented] reaction

G. M. Huber, G. J. Lolos, Z. Papandreou, A. Shinozaki, E. J. Brash, M. Iurescu, G. Garino, K. Maruyama, K. Maeda, T. Suda, A. Toyofuku, B. K. Jennings, A. Sasaki, H. Yamashita

Research output: Contribution to journalArticlepeer-review


We report a helicity analysis of subthreshold [Formula Presented] production on [Formula Presented], and [Formula Presented] at low photoproduction energies. The results are indicative of a large longitudinal [Formula Presented] polarization [Formula Presented] and are consistent with a strong helicity-flip production mechanism. This signature is used to extract in-medium [Formula Presented] invariant mass distributions for all three nuclei in a manner which is less model dependent than previous measurements. The results are compared to kinematic and phenomenological models of the [Formula Presented] spectral function. The [Formula Presented] and [Formula Presented] data distributions support the role of [Formula Presented] excitation in shaping the in-medium [Formula Presented] invariant mass distribution, while the [Formula Presented] distributions are consistent with quasi-free [Formula Presented] production. The data support an in-medium modification of the [Formula Presented] invariant mass distribution.

Original languageEnglish
Pages (from-to)27
Number of pages1
JournalPhysical Review C - Nuclear Physics
Issue number6
Publication statusPublished - 2003


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