dorsal/arxiv
View SchemaCompeting electric and magnetic excitations in backward electron scattering from heavy deformed nuclei
| Authors | R. Nojarov, Amand Faessler, M. Dingfelder |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9509037 |
| URL | https://arxiv.org/abs/nucl-th/9509037 |
| DOI | 10.1103/PhysRevC.52.3259 |
| Journal | Phys.Rev.C52:3259-3276,1995 |
Abstract
Important $E2$ contributions to the $(e,e^{\prime})$ cross sections of low-lying orbital $M1$ excitations are found in heavy deformed nuclei, arising from the small energy separation between the two excitations with $I^{\pi}K = 2^+1$ and 1$^+1$, respectively. They are studied microscopically in QRPA using DWBA. The accompanying $E2$ response is negligible at small momentum transfer $q$ but contributes substantially to the cross sections measured at $\theta = 165 ^{\circ}$ for $0.6 < q_{\rm eff} < 0.9$ fm$^{-1}$ ($40 \le E_i \le 70$ MeV) and leads to a very good agreement with experiment. The electric response is of longitudinal $C2$ type for $\theta \le 175 ^{\circ}$ but becomes almost purely transverse $E2$ for larger backward angles. The transverse $E2$ response remains comparable with the $M1$ response for $q_{\rm eff} > 1.2$ fm$^{-1}$ ($E_i > 100$ MeV) and even dominant for $E_i > 200$ MeV. This happens even at large backward angles $\theta > 175 ^{\circ}$, where the $M1$ dominance is limited to the lower $q$ region.
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"abstract": "Important $E2$ contributions to the $(e,e^{\\prime})$ cross sections of\nlow-lying orbital $M1$ excitations are found in heavy deformed nuclei, arising\nfrom the small energy separation between the two excitations with $I^{\\pi}K =\n2^+1$ and 1$^+1$, respectively. They are studied microscopically in QRPA using\nDWBA. The accompanying $E2$ response is negligible at small momentum transfer\n$q$ but contributes substantially to the cross sections measured at $\\theta =\n165 ^{\\circ}$ for $0.6 \u003c q_{\\rm eff} \u003c 0.9$ fm$^{-1}$ ($40 \\le E_i \\le 70$ MeV)\nand leads to a very good agreement with experiment. The electric response is of\nlongitudinal $C2$ type for $\\theta \\le 175 ^{\\circ}$ but becomes almost purely\ntransverse $E2$ for larger backward angles. The transverse $E2$ response\nremains comparable with the $M1$ response for $q_{\\rm eff} \u003e 1.2$ fm$^{-1}$\n($E_i \u003e 100$ MeV) and even dominant for $E_i \u003e 200$ MeV. This happens even at\nlarge backward angles $\\theta \u003e 175 ^{\\circ}$, where the $M1$ dominance is\nlimited to the lower $q$ region.",
"arxiv_id": "nucl-th/9509037",
"authors": [
"R. Nojarov",
"Amand Faessler",
"M. Dingfelder"
],
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"nucl-th"
],
"doi": "10.1103/PhysRevC.52.3259",
"journal_ref": "Phys.Rev.C52:3259-3276,1995",
"title": "Competing electric and magnetic excitations in backward electron scattering from heavy deformed nuclei",
"url": "https://arxiv.org/abs/nucl-th/9509037"
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