dorsal/arxiv
View SchemaIsoscalar Roper Excitation in $p(\alpha, \alpha')$ Reactions in the $10 - 15$ $GeV$ Region
| Authors | S. Hirenzaki, E. Oset, P. Fernández de Córdoba |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9512035 |
| URL | https://arxiv.org/abs/nucl-th/9512035 |
| DOI | 10.1016/0370-2693(96)00369-3 |
| Journal | Phys.Lett. B378 (1996) 29-34 |
Abstract
Recent experiments at Saturne at $4$ $GeV$ showed that the $(\alpha,\alpha')$ reaction on the proton shows two distinctive peaks, which were associated to $\Delta$ projectile excitation and Roper target excitation. A subsequent theoretical analysis has shown that this picture is qualitatively correct but there are important interference effects between the two mechanisms. Futhermore, at this energy the ratio of strengths for the Roper and $\Delta$ peak is about $1/4$. In the present paper we show that by going to the $10 - 15$ $GeV$ region the interference effects become negligible, the signal for the Roper excitation is increased by more than an order of magnitude and the ratio of cross sections at the peaks for Roper and $\Delta$ excitation becomes of the order of unity, thus making this range of energies ideal for studies of isoscalar Roper excitation.
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"abstract": "Recent experiments at Saturne at $4$ $GeV$ showed that the $(\\alpha,\\alpha\u0027)$\nreaction on the proton shows two distinctive peaks, which were associated to\n$\\Delta$ projectile excitation and Roper target excitation. A subsequent\ntheoretical analysis has shown that this picture is qualitatively correct but\nthere are important interference effects between the two mechanisms.\nFuthermore, at this energy the ratio of strengths for the Roper and $\\Delta$\npeak is about $1/4$. In the present paper we show that by going to the $10 -\n15$ $GeV$ region the interference effects become negligible, the signal for the\nRoper excitation is increased by more than an order of magnitude and the ratio\nof cross sections at the peaks for Roper and $\\Delta$ excitation becomes of the\norder of unity, thus making this range of energies ideal for studies of\nisoscalar Roper excitation.",
"arxiv_id": "nucl-th/9512035",
"authors": [
"S. Hirenzaki",
"E. Oset",
"P. Fern\u00e1ndez de C\u00f3rdoba"
],
"categories": [
"nucl-th",
"nucl-ex"
],
"doi": "10.1016/0370-2693(96)00369-3",
"journal_ref": "Phys.Lett. B378 (1996) 29-34",
"title": "Isoscalar Roper Excitation in $p(\\alpha, \\alpha\u0027)$ Reactions in the $10 - 15$ $GeV$ Region",
"url": "https://arxiv.org/abs/nucl-th/9512035"
},
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