Search for the density effect in inner-shell lonization by ultra relativistic electron impact
Abstract We have extended the measurements ofK-andL-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9≦E≦2.0 GeV, in order to search for a saturation of the cross section. This phenomenon, which is due to the polarization of the target medium, is called...
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| Autor*in: |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1982 |
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| Umfang: |
11 |
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| Reproduktion: |
Springer Online Journal Archives 1860-2002 |
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| Übergeordnetes Werk: |
in: The European physical journal - 1998, 305(1982) vom: Jan., Seite 9-19 |
| Übergeordnetes Werk: |
volume:305 ; year:1982 ; month:01 ; pages:9-19 ; extent:11 |
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NLEJ198980973 |
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| 245 | 1 | 0 | |a Search for the density effect in inner-shell lonization by ultra relativistic electron impact |
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| 520 | |a Abstract We have extended the measurements ofK-andL-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9≦E≦2.0 GeV, in order to search for a saturation of the cross section. This phenomenon, which is due to the polarization of the target medium, is called density effect. It is predicted to occur at several hundred MeV impact energy and preferentially for lowZ target elements. Theoretical calculations are presented, based on the one-photon-exchange approximation. The absolute measurements of theK-andL-shell cross sections for Ni(K), Cu(K), Ag(K, L) and Au(L) performed at the 2.5 GeV electron synchrotron of the Bonn University, however, exhibit that the cross sections show no saturation but are still increasing. Furthermore, from theK X-ray yields, obtained at 0.9 and 2.0 GeV by bombarding the lowZ elements S, Ca, Mn, Ni and Ge, we obtain for the corresponding cross section ratio σ K (2GeV)/σ K (0.9GeV)=1.08±0.01 on the average. TheK X-ray yield of a composite Ca — Mn target amounts to $$[\sigma _K (Ca;2.0GeV)/\sigma _K (Mn;2.0GeV)]/[\sigma _K (Ca;0.9GeV/\sigma _K (Mn;0.9GeV)] = 0.99 \pm 0.02.$$ . All three results are in disagreement with theory. This severe discrepancy is discussed but the origin for it is not yet understood. | ||
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| 700 | 1 | |a Genz, H. |4 oth | |
| 700 | 1 | |a Brendel, C. |4 oth | |
| 700 | 1 | |a Eschwey, P. |4 oth | |
| 700 | 1 | |a Kuhn, U. |4 oth | |
| 700 | 1 | |a Löw, W. |4 oth | |
| 700 | 1 | |a Richter, A. |4 oth | |
| 700 | 1 | |a Seserko, P. |4 oth | |
| 700 | 1 | |a Sauerwein, R. |4 oth | |
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(DE-627)NLEJ198980973 DE-627 ger DE-627 rakwb eng Search for the density effect in inner-shell lonization by ultra relativistic electron impact 1982 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract We have extended the measurements ofK-andL-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9≦E≦2.0 GeV, in order to search for a saturation of the cross section. This phenomenon, which is due to the polarization of the target medium, is called density effect. It is predicted to occur at several hundred MeV impact energy and preferentially for lowZ target elements. Theoretical calculations are presented, based on the one-photon-exchange approximation. The absolute measurements of theK-andL-shell cross sections for Ni(K), Cu(K), Ag(K, L) and Au(L) performed at the 2.5 GeV electron synchrotron of the Bonn University, however, exhibit that the cross sections show no saturation but are still increasing. Furthermore, from theK X-ray yields, obtained at 0.9 and 2.0 GeV by bombarding the lowZ elements S, Ca, Mn, Ni and Ge, we obtain for the corresponding cross section ratio σ K (2GeV)/σ K (0.9GeV)=1.08±0.01 on the average. TheK X-ray yield of a composite Ca — Mn target amounts to $$[\sigma _K (Ca;2.0GeV)/\sigma _K (Mn;2.0GeV)]/[\sigma _K (Ca;0.9GeV/\sigma _K (Mn;0.9GeV)] = 0.99 \pm 0.02.$$ . All three results are in disagreement with theory. This severe discrepancy is discussed but the origin for it is not yet understood. Springer Online Journal Archives 1860-2002 Genz, H. oth Brendel, C. oth Eschwey, P. oth Kuhn, U. oth Löw, W. oth Richter, A. oth Seserko, P. oth Sauerwein, R. oth in The European physical journal 1998 305(1982) vom: Jan., Seite 9-19 (DE-627)NLEJ188987754 (DE-600)1459066-9 1434-601X nnns volume:305 year:1982 month:01 pages:9-19 extent:11 http://dx.doi.org/10.1007/BF01415072 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 305 1982 1 9-19 11 |
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(DE-627)NLEJ198980973 DE-627 ger DE-627 rakwb eng Search for the density effect in inner-shell lonization by ultra relativistic electron impact 1982 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract We have extended the measurements ofK-andL-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9≦E≦2.0 GeV, in order to search for a saturation of the cross section. This phenomenon, which is due to the polarization of the target medium, is called density effect. It is predicted to occur at several hundred MeV impact energy and preferentially for lowZ target elements. Theoretical calculations are presented, based on the one-photon-exchange approximation. The absolute measurements of theK-andL-shell cross sections for Ni(K), Cu(K), Ag(K, L) and Au(L) performed at the 2.5 GeV electron synchrotron of the Bonn University, however, exhibit that the cross sections show no saturation but are still increasing. Furthermore, from theK X-ray yields, obtained at 0.9 and 2.0 GeV by bombarding the lowZ elements S, Ca, Mn, Ni and Ge, we obtain for the corresponding cross section ratio σ K (2GeV)/σ K (0.9GeV)=1.08±0.01 on the average. TheK X-ray yield of a composite Ca — Mn target amounts to $$[\sigma _K (Ca;2.0GeV)/\sigma _K (Mn;2.0GeV)]/[\sigma _K (Ca;0.9GeV/\sigma _K (Mn;0.9GeV)] = 0.99 \pm 0.02.$$ . All three results are in disagreement with theory. This severe discrepancy is discussed but the origin for it is not yet understood. Springer Online Journal Archives 1860-2002 Genz, H. oth Brendel, C. oth Eschwey, P. oth Kuhn, U. oth Löw, W. oth Richter, A. oth Seserko, P. oth Sauerwein, R. oth in The European physical journal 1998 305(1982) vom: Jan., Seite 9-19 (DE-627)NLEJ188987754 (DE-600)1459066-9 1434-601X nnns volume:305 year:1982 month:01 pages:9-19 extent:11 http://dx.doi.org/10.1007/BF01415072 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 305 1982 1 9-19 11 |
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(DE-627)NLEJ198980973 DE-627 ger DE-627 rakwb eng Search for the density effect in inner-shell lonization by ultra relativistic electron impact 1982 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract We have extended the measurements ofK-andL-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9≦E≦2.0 GeV, in order to search for a saturation of the cross section. This phenomenon, which is due to the polarization of the target medium, is called density effect. It is predicted to occur at several hundred MeV impact energy and preferentially for lowZ target elements. Theoretical calculations are presented, based on the one-photon-exchange approximation. The absolute measurements of theK-andL-shell cross sections for Ni(K), Cu(K), Ag(K, L) and Au(L) performed at the 2.5 GeV electron synchrotron of the Bonn University, however, exhibit that the cross sections show no saturation but are still increasing. Furthermore, from theK X-ray yields, obtained at 0.9 and 2.0 GeV by bombarding the lowZ elements S, Ca, Mn, Ni and Ge, we obtain for the corresponding cross section ratio σ K (2GeV)/σ K (0.9GeV)=1.08±0.01 on the average. TheK X-ray yield of a composite Ca — Mn target amounts to $$[\sigma _K (Ca;2.0GeV)/\sigma _K (Mn;2.0GeV)]/[\sigma _K (Ca;0.9GeV/\sigma _K (Mn;0.9GeV)] = 0.99 \pm 0.02.$$ . All three results are in disagreement with theory. This severe discrepancy is discussed but the origin for it is not yet understood. Springer Online Journal Archives 1860-2002 Genz, H. oth Brendel, C. oth Eschwey, P. oth Kuhn, U. oth Löw, W. oth Richter, A. oth Seserko, P. oth Sauerwein, R. oth in The European physical journal 1998 305(1982) vom: Jan., Seite 9-19 (DE-627)NLEJ188987754 (DE-600)1459066-9 1434-601X nnns volume:305 year:1982 month:01 pages:9-19 extent:11 http://dx.doi.org/10.1007/BF01415072 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 305 1982 1 9-19 11 |
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(DE-627)NLEJ198980973 DE-627 ger DE-627 rakwb eng Search for the density effect in inner-shell lonization by ultra relativistic electron impact 1982 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract We have extended the measurements ofK-andL-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9≦E≦2.0 GeV, in order to search for a saturation of the cross section. This phenomenon, which is due to the polarization of the target medium, is called density effect. It is predicted to occur at several hundred MeV impact energy and preferentially for lowZ target elements. Theoretical calculations are presented, based on the one-photon-exchange approximation. The absolute measurements of theK-andL-shell cross sections for Ni(K), Cu(K), Ag(K, L) and Au(L) performed at the 2.5 GeV electron synchrotron of the Bonn University, however, exhibit that the cross sections show no saturation but are still increasing. Furthermore, from theK X-ray yields, obtained at 0.9 and 2.0 GeV by bombarding the lowZ elements S, Ca, Mn, Ni and Ge, we obtain for the corresponding cross section ratio σ K (2GeV)/σ K (0.9GeV)=1.08±0.01 on the average. TheK X-ray yield of a composite Ca — Mn target amounts to $$[\sigma _K (Ca;2.0GeV)/\sigma _K (Mn;2.0GeV)]/[\sigma _K (Ca;0.9GeV/\sigma _K (Mn;0.9GeV)] = 0.99 \pm 0.02.$$ . All three results are in disagreement with theory. This severe discrepancy is discussed but the origin for it is not yet understood. Springer Online Journal Archives 1860-2002 Genz, H. oth Brendel, C. oth Eschwey, P. oth Kuhn, U. oth Löw, W. oth Richter, A. oth Seserko, P. oth Sauerwein, R. oth in The European physical journal 1998 305(1982) vom: Jan., Seite 9-19 (DE-627)NLEJ188987754 (DE-600)1459066-9 1434-601X nnns volume:305 year:1982 month:01 pages:9-19 extent:11 http://dx.doi.org/10.1007/BF01415072 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 305 1982 1 9-19 11 |
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(DE-627)NLEJ198980973 DE-627 ger DE-627 rakwb eng Search for the density effect in inner-shell lonization by ultra relativistic electron impact 1982 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Abstract We have extended the measurements ofK-andL-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9≦E≦2.0 GeV, in order to search for a saturation of the cross section. This phenomenon, which is due to the polarization of the target medium, is called density effect. It is predicted to occur at several hundred MeV impact energy and preferentially for lowZ target elements. Theoretical calculations are presented, based on the one-photon-exchange approximation. The absolute measurements of theK-andL-shell cross sections for Ni(K), Cu(K), Ag(K, L) and Au(L) performed at the 2.5 GeV electron synchrotron of the Bonn University, however, exhibit that the cross sections show no saturation but are still increasing. Furthermore, from theK X-ray yields, obtained at 0.9 and 2.0 GeV by bombarding the lowZ elements S, Ca, Mn, Ni and Ge, we obtain for the corresponding cross section ratio σ K (2GeV)/σ K (0.9GeV)=1.08±0.01 on the average. TheK X-ray yield of a composite Ca — Mn target amounts to $$[\sigma _K (Ca;2.0GeV)/\sigma _K (Mn;2.0GeV)]/[\sigma _K (Ca;0.9GeV/\sigma _K (Mn;0.9GeV)] = 0.99 \pm 0.02.$$ . All three results are in disagreement with theory. This severe discrepancy is discussed but the origin for it is not yet understood. Springer Online Journal Archives 1860-2002 Genz, H. oth Brendel, C. oth Eschwey, P. oth Kuhn, U. oth Löw, W. oth Richter, A. oth Seserko, P. oth Sauerwein, R. oth in The European physical journal 1998 305(1982) vom: Jan., Seite 9-19 (DE-627)NLEJ188987754 (DE-600)1459066-9 1434-601X nnns volume:305 year:1982 month:01 pages:9-19 extent:11 http://dx.doi.org/10.1007/BF01415072 GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE AR 305 1982 1 9-19 11 |
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Search for the density effect in inner-shell lonization by ultra relativistic electron impact |
| abstract |
Abstract We have extended the measurements ofK-andL-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9≦E≦2.0 GeV, in order to search for a saturation of the cross section. This phenomenon, which is due to the polarization of the target medium, is called density effect. It is predicted to occur at several hundred MeV impact energy and preferentially for lowZ target elements. Theoretical calculations are presented, based on the one-photon-exchange approximation. The absolute measurements of theK-andL-shell cross sections for Ni(K), Cu(K), Ag(K, L) and Au(L) performed at the 2.5 GeV electron synchrotron of the Bonn University, however, exhibit that the cross sections show no saturation but are still increasing. Furthermore, from theK X-ray yields, obtained at 0.9 and 2.0 GeV by bombarding the lowZ elements S, Ca, Mn, Ni and Ge, we obtain for the corresponding cross section ratio σ K (2GeV)/σ K (0.9GeV)=1.08±0.01 on the average. TheK X-ray yield of a composite Ca — Mn target amounts to $$[\sigma _K (Ca;2.0GeV)/\sigma _K (Mn;2.0GeV)]/[\sigma _K (Ca;0.9GeV/\sigma _K (Mn;0.9GeV)] = 0.99 \pm 0.02.$$ . All three results are in disagreement with theory. This severe discrepancy is discussed but the origin for it is not yet understood. |
| abstractGer |
Abstract We have extended the measurements ofK-andL-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9≦E≦2.0 GeV, in order to search for a saturation of the cross section. This phenomenon, which is due to the polarization of the target medium, is called density effect. It is predicted to occur at several hundred MeV impact energy and preferentially for lowZ target elements. Theoretical calculations are presented, based on the one-photon-exchange approximation. The absolute measurements of theK-andL-shell cross sections for Ni(K), Cu(K), Ag(K, L) and Au(L) performed at the 2.5 GeV electron synchrotron of the Bonn University, however, exhibit that the cross sections show no saturation but are still increasing. Furthermore, from theK X-ray yields, obtained at 0.9 and 2.0 GeV by bombarding the lowZ elements S, Ca, Mn, Ni and Ge, we obtain for the corresponding cross section ratio σ K (2GeV)/σ K (0.9GeV)=1.08±0.01 on the average. TheK X-ray yield of a composite Ca — Mn target amounts to $$[\sigma _K (Ca;2.0GeV)/\sigma _K (Mn;2.0GeV)]/[\sigma _K (Ca;0.9GeV/\sigma _K (Mn;0.9GeV)] = 0.99 \pm 0.02.$$ . All three results are in disagreement with theory. This severe discrepancy is discussed but the origin for it is not yet understood. |
| abstract_unstemmed |
Abstract We have extended the measurements ofK-andL-shell ionization cross sections by electron impact into the ultra relativistic energy region, 0.9≦E≦2.0 GeV, in order to search for a saturation of the cross section. This phenomenon, which is due to the polarization of the target medium, is called density effect. It is predicted to occur at several hundred MeV impact energy and preferentially for lowZ target elements. Theoretical calculations are presented, based on the one-photon-exchange approximation. The absolute measurements of theK-andL-shell cross sections for Ni(K), Cu(K), Ag(K, L) and Au(L) performed at the 2.5 GeV electron synchrotron of the Bonn University, however, exhibit that the cross sections show no saturation but are still increasing. Furthermore, from theK X-ray yields, obtained at 0.9 and 2.0 GeV by bombarding the lowZ elements S, Ca, Mn, Ni and Ge, we obtain for the corresponding cross section ratio σ K (2GeV)/σ K (0.9GeV)=1.08±0.01 on the average. TheK X-ray yield of a composite Ca — Mn target amounts to $$[\sigma _K (Ca;2.0GeV)/\sigma _K (Mn;2.0GeV)]/[\sigma _K (Ca;0.9GeV/\sigma _K (Mn;0.9GeV)] = 0.99 \pm 0.02.$$ . All three results are in disagreement with theory. This severe discrepancy is discussed but the origin for it is not yet understood. |
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GBV_USEFLAG_U ZDB-1-SOJ GBV_NL_ARTICLE |
| title_short |
Search for the density effect in inner-shell lonization by ultra relativistic electron impact |
| url |
http://dx.doi.org/10.1007/BF01415072 |
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| author2 |
Genz, H. Brendel, C. Eschwey, P. Kuhn, U. Löw, W. Richter, A. Seserko, P. Sauerwein, R. |
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Genz, H. Brendel, C. Eschwey, P. Kuhn, U. Löw, W. Richter, A. Seserko, P. Sauerwein, R. |
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2024-07-05T22:45:09.659Z |
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7.3990545 |