n-p Differential Cross Section and Polarization at 199 MeV
The relative differential cross sections and polarization parameters for free n-p scattering, and for the reaction n+d→p+2n in which only the proton is detected (bound n-p scattering), have been measured at an incident energy of 199 MeV, at two-nucleon c.m. angles between 77° and 158°. The neutron b...
Ausführliche Beschreibung
Gespeichert in:
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E-Artikel |
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| Erschienen: |
1968 |
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Online-Ressource 10 |
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| Reproduktion: |
APS Digital Backfile Archive 1893-2003 |
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| Übergeordnetes Werk: |
Enthalten in: The physical review - Lancaster, Pa. [u.a.], 1893, 167(1968), 5, Seite 1240-1249 |
| Übergeordnetes Werk: |
volume:167 ; year:1968 ; number:5 ; pages:1240-1249 ; extent:10 |
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NLEJ251536548 |
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| 520 | |a The relative differential cross sections and polarization parameters for free n-p scattering, and for the reaction n+d→p+2n in which only the proton is detected (bound n-p scattering), have been measured at an incident energy of 199 MeV, at two-nucleon c.m. angles between 77° and 158°. The neutron beam used, created by charge-exchange scattering of a polarized proton beam on a deuterium target, had an energy spread of ±12 MeV, a polarization of 73%, and an intensity of 1000 n/sec. The beam polarization was determined by comparing the asymmetry measured in the reaction n+d→p+2n with the polarization of the (previously studied) charge-symmetric reaction p+d→n+2p, in which only the neutron is detected. The differential cross section σ and the polarization P, for free n-p scattering, the ratio RM of the bound to the free cross section, and the difference P-Pb between the free and bound polarization parameters are listed. θc.m. σ P RM P-Pb 158.1 1.000±0.021 -0.071±0.012 0.665±0.044 +0.027±0.018 148.1 0.836±0.017 -0.117±0.011 0.648±0.043 -0.003±0.019 137.8 0.701±0.015 -0.125±0.009 0.675±0.044 -0.003±0.015 127.4 0.578±0.013 -0.125±0.010 0.660±0.044 +0.019±0.018 117.1 0.461±0.010 -0.111±0.011 ... ... 96.3 0.320±0.008 -0.075±0.014 0.630±0.044 -0.035±0.026 86.6 0.292±0.007 0.029±0.017 ... ... 76.9 0.273±0.008 0.132±0.028 0.597±0.043 0.071±0.041 A 10% systematic error in P, due to uncertainty in beam polarization, is not included in the listed error. The cross-section measurements agree with those of Kazarinov and Simonov and with the phase-shift solution (Y-IV)np of Breit et al. but disagree with the older measurements of Guernsey, Mott, and Nelson. The polarization measurements are in satisfactory agreement with the (less accurate) results of Tinlot and Warner, but in only fair agreement with the phase-shift solution (Y-IV)np. The ratio RM, typically 0.65 ±0.04, is significantly smaller than that given by an impulse-approximation calculation, typically 0.76. The difference between polarization parameters for free and bound scattering is consistent with an impulse-approximation calculation but also consistent with zero. | ||
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(DE-627)NLEJ251536548 (DE-601)aps:e6f32d739ed5919e8d1b212454104ba8078b15d6 DE-627 ger DE-627 rakwb n-p Differential Cross Section and Polarization at 199 MeV 1968 Online-Ressource 10 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The relative differential cross sections and polarization parameters for free n-p scattering, and for the reaction n+d→p+2n in which only the proton is detected (bound n-p scattering), have been measured at an incident energy of 199 MeV, at two-nucleon c.m. angles between 77° and 158°. The neutron beam used, created by charge-exchange scattering of a polarized proton beam on a deuterium target, had an energy spread of ±12 MeV, a polarization of 73%, and an intensity of 1000 n/sec. The beam polarization was determined by comparing the asymmetry measured in the reaction n+d→p+2n with the polarization of the (previously studied) charge-symmetric reaction p+d→n+2p, in which only the neutron is detected. The differential cross section σ and the polarization P, for free n-p scattering, the ratio RM of the bound to the free cross section, and the difference P-Pb between the free and bound polarization parameters are listed. θc.m. σ P RM P-Pb 158.1 1.000±0.021 -0.071±0.012 0.665±0.044 +0.027±0.018 148.1 0.836±0.017 -0.117±0.011 0.648±0.043 -0.003±0.019 137.8 0.701±0.015 -0.125±0.009 0.675±0.044 -0.003±0.015 127.4 0.578±0.013 -0.125±0.010 0.660±0.044 +0.019±0.018 117.1 0.461±0.010 -0.111±0.011 ... ... 96.3 0.320±0.008 -0.075±0.014 0.630±0.044 -0.035±0.026 86.6 0.292±0.007 0.029±0.017 ... ... 76.9 0.273±0.008 0.132±0.028 0.597±0.043 0.071±0.041 A 10% systematic error in P, due to uncertainty in beam polarization, is not included in the listed error. The cross-section measurements agree with those of Kazarinov and Simonov and with the phase-shift solution (Y-IV)np of Breit et al. but disagree with the older measurements of Guernsey, Mott, and Nelson. The polarization measurements are in satisfactory agreement with the (less accurate) results of Tinlot and Warner, but in only fair agreement with the phase-shift solution (Y-IV)np. The ratio RM, typically 0.65 ±0.04, is significantly smaller than that given by an impulse-approximation calculation, typically 0.76. The difference between polarization parameters for free and bound scattering is consistent with an impulse-approximation calculation but also consistent with zero. APS Digital Backfile Archive 1893-2003 Thomas, A. R. oth Spalding, D. oth Thorndike, E. H. oth Enthalten in The physical review Lancaster, Pa. [u.a.], 1893 167(1968), 5, Seite 1240-1249 (DE-627)NLEJ24823790X (DE-600)2177092-X 1536-6065 nnns volume:167 year:1968 number:5 pages:1240-1249 extent:10 https://www.tib.eu/de/suchen/id/aps%3Ae6f32d739ed5919e8d1b212454104ba8078b15d6 Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 167 1968 5 1240-1249 10 |
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(DE-627)NLEJ251536548 (DE-601)aps:e6f32d739ed5919e8d1b212454104ba8078b15d6 DE-627 ger DE-627 rakwb n-p Differential Cross Section and Polarization at 199 MeV 1968 Online-Ressource 10 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The relative differential cross sections and polarization parameters for free n-p scattering, and for the reaction n+d→p+2n in which only the proton is detected (bound n-p scattering), have been measured at an incident energy of 199 MeV, at two-nucleon c.m. angles between 77° and 158°. The neutron beam used, created by charge-exchange scattering of a polarized proton beam on a deuterium target, had an energy spread of ±12 MeV, a polarization of 73%, and an intensity of 1000 n/sec. The beam polarization was determined by comparing the asymmetry measured in the reaction n+d→p+2n with the polarization of the (previously studied) charge-symmetric reaction p+d→n+2p, in which only the neutron is detected. The differential cross section σ and the polarization P, for free n-p scattering, the ratio RM of the bound to the free cross section, and the difference P-Pb between the free and bound polarization parameters are listed. θc.m. σ P RM P-Pb 158.1 1.000±0.021 -0.071±0.012 0.665±0.044 +0.027±0.018 148.1 0.836±0.017 -0.117±0.011 0.648±0.043 -0.003±0.019 137.8 0.701±0.015 -0.125±0.009 0.675±0.044 -0.003±0.015 127.4 0.578±0.013 -0.125±0.010 0.660±0.044 +0.019±0.018 117.1 0.461±0.010 -0.111±0.011 ... ... 96.3 0.320±0.008 -0.075±0.014 0.630±0.044 -0.035±0.026 86.6 0.292±0.007 0.029±0.017 ... ... 76.9 0.273±0.008 0.132±0.028 0.597±0.043 0.071±0.041 A 10% systematic error in P, due to uncertainty in beam polarization, is not included in the listed error. The cross-section measurements agree with those of Kazarinov and Simonov and with the phase-shift solution (Y-IV)np of Breit et al. but disagree with the older measurements of Guernsey, Mott, and Nelson. The polarization measurements are in satisfactory agreement with the (less accurate) results of Tinlot and Warner, but in only fair agreement with the phase-shift solution (Y-IV)np. The ratio RM, typically 0.65 ±0.04, is significantly smaller than that given by an impulse-approximation calculation, typically 0.76. The difference between polarization parameters for free and bound scattering is consistent with an impulse-approximation calculation but also consistent with zero. APS Digital Backfile Archive 1893-2003 Thomas, A. R. oth Spalding, D. oth Thorndike, E. H. oth Enthalten in The physical review Lancaster, Pa. [u.a.], 1893 167(1968), 5, Seite 1240-1249 (DE-627)NLEJ24823790X (DE-600)2177092-X 1536-6065 nnns volume:167 year:1968 number:5 pages:1240-1249 extent:10 https://www.tib.eu/de/suchen/id/aps%3Ae6f32d739ed5919e8d1b212454104ba8078b15d6 Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 167 1968 5 1240-1249 10 |
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(DE-627)NLEJ251536548 (DE-601)aps:e6f32d739ed5919e8d1b212454104ba8078b15d6 DE-627 ger DE-627 rakwb n-p Differential Cross Section and Polarization at 199 MeV 1968 Online-Ressource 10 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The relative differential cross sections and polarization parameters for free n-p scattering, and for the reaction n+d→p+2n in which only the proton is detected (bound n-p scattering), have been measured at an incident energy of 199 MeV, at two-nucleon c.m. angles between 77° and 158°. The neutron beam used, created by charge-exchange scattering of a polarized proton beam on a deuterium target, had an energy spread of ±12 MeV, a polarization of 73%, and an intensity of 1000 n/sec. The beam polarization was determined by comparing the asymmetry measured in the reaction n+d→p+2n with the polarization of the (previously studied) charge-symmetric reaction p+d→n+2p, in which only the neutron is detected. The differential cross section σ and the polarization P, for free n-p scattering, the ratio RM of the bound to the free cross section, and the difference P-Pb between the free and bound polarization parameters are listed. θc.m. σ P RM P-Pb 158.1 1.000±0.021 -0.071±0.012 0.665±0.044 +0.027±0.018 148.1 0.836±0.017 -0.117±0.011 0.648±0.043 -0.003±0.019 137.8 0.701±0.015 -0.125±0.009 0.675±0.044 -0.003±0.015 127.4 0.578±0.013 -0.125±0.010 0.660±0.044 +0.019±0.018 117.1 0.461±0.010 -0.111±0.011 ... ... 96.3 0.320±0.008 -0.075±0.014 0.630±0.044 -0.035±0.026 86.6 0.292±0.007 0.029±0.017 ... ... 76.9 0.273±0.008 0.132±0.028 0.597±0.043 0.071±0.041 A 10% systematic error in P, due to uncertainty in beam polarization, is not included in the listed error. The cross-section measurements agree with those of Kazarinov and Simonov and with the phase-shift solution (Y-IV)np of Breit et al. but disagree with the older measurements of Guernsey, Mott, and Nelson. The polarization measurements are in satisfactory agreement with the (less accurate) results of Tinlot and Warner, but in only fair agreement with the phase-shift solution (Y-IV)np. The ratio RM, typically 0.65 ±0.04, is significantly smaller than that given by an impulse-approximation calculation, typically 0.76. The difference between polarization parameters for free and bound scattering is consistent with an impulse-approximation calculation but also consistent with zero. APS Digital Backfile Archive 1893-2003 Thomas, A. R. oth Spalding, D. oth Thorndike, E. H. oth Enthalten in The physical review Lancaster, Pa. [u.a.], 1893 167(1968), 5, Seite 1240-1249 (DE-627)NLEJ24823790X (DE-600)2177092-X 1536-6065 nnns volume:167 year:1968 number:5 pages:1240-1249 extent:10 https://www.tib.eu/de/suchen/id/aps%3Ae6f32d739ed5919e8d1b212454104ba8078b15d6 Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 167 1968 5 1240-1249 10 |
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(DE-627)NLEJ251536548 (DE-601)aps:e6f32d739ed5919e8d1b212454104ba8078b15d6 DE-627 ger DE-627 rakwb n-p Differential Cross Section and Polarization at 199 MeV 1968 Online-Ressource 10 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The relative differential cross sections and polarization parameters for free n-p scattering, and for the reaction n+d→p+2n in which only the proton is detected (bound n-p scattering), have been measured at an incident energy of 199 MeV, at two-nucleon c.m. angles between 77° and 158°. The neutron beam used, created by charge-exchange scattering of a polarized proton beam on a deuterium target, had an energy spread of ±12 MeV, a polarization of 73%, and an intensity of 1000 n/sec. The beam polarization was determined by comparing the asymmetry measured in the reaction n+d→p+2n with the polarization of the (previously studied) charge-symmetric reaction p+d→n+2p, in which only the neutron is detected. The differential cross section σ and the polarization P, for free n-p scattering, the ratio RM of the bound to the free cross section, and the difference P-Pb between the free and bound polarization parameters are listed. θc.m. σ P RM P-Pb 158.1 1.000±0.021 -0.071±0.012 0.665±0.044 +0.027±0.018 148.1 0.836±0.017 -0.117±0.011 0.648±0.043 -0.003±0.019 137.8 0.701±0.015 -0.125±0.009 0.675±0.044 -0.003±0.015 127.4 0.578±0.013 -0.125±0.010 0.660±0.044 +0.019±0.018 117.1 0.461±0.010 -0.111±0.011 ... ... 96.3 0.320±0.008 -0.075±0.014 0.630±0.044 -0.035±0.026 86.6 0.292±0.007 0.029±0.017 ... ... 76.9 0.273±0.008 0.132±0.028 0.597±0.043 0.071±0.041 A 10% systematic error in P, due to uncertainty in beam polarization, is not included in the listed error. The cross-section measurements agree with those of Kazarinov and Simonov and with the phase-shift solution (Y-IV)np of Breit et al. but disagree with the older measurements of Guernsey, Mott, and Nelson. The polarization measurements are in satisfactory agreement with the (less accurate) results of Tinlot and Warner, but in only fair agreement with the phase-shift solution (Y-IV)np. The ratio RM, typically 0.65 ±0.04, is significantly smaller than that given by an impulse-approximation calculation, typically 0.76. The difference between polarization parameters for free and bound scattering is consistent with an impulse-approximation calculation but also consistent with zero. APS Digital Backfile Archive 1893-2003 Thomas, A. R. oth Spalding, D. oth Thorndike, E. H. oth Enthalten in The physical review Lancaster, Pa. [u.a.], 1893 167(1968), 5, Seite 1240-1249 (DE-627)NLEJ24823790X (DE-600)2177092-X 1536-6065 nnns volume:167 year:1968 number:5 pages:1240-1249 extent:10 https://www.tib.eu/de/suchen/id/aps%3Ae6f32d739ed5919e8d1b212454104ba8078b15d6 Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 167 1968 5 1240-1249 10 |
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(DE-627)NLEJ251536548 (DE-601)aps:e6f32d739ed5919e8d1b212454104ba8078b15d6 DE-627 ger DE-627 rakwb n-p Differential Cross Section and Polarization at 199 MeV 1968 Online-Ressource 10 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The relative differential cross sections and polarization parameters for free n-p scattering, and for the reaction n+d→p+2n in which only the proton is detected (bound n-p scattering), have been measured at an incident energy of 199 MeV, at two-nucleon c.m. angles between 77° and 158°. The neutron beam used, created by charge-exchange scattering of a polarized proton beam on a deuterium target, had an energy spread of ±12 MeV, a polarization of 73%, and an intensity of 1000 n/sec. The beam polarization was determined by comparing the asymmetry measured in the reaction n+d→p+2n with the polarization of the (previously studied) charge-symmetric reaction p+d→n+2p, in which only the neutron is detected. The differential cross section σ and the polarization P, for free n-p scattering, the ratio RM of the bound to the free cross section, and the difference P-Pb between the free and bound polarization parameters are listed. θc.m. σ P RM P-Pb 158.1 1.000±0.021 -0.071±0.012 0.665±0.044 +0.027±0.018 148.1 0.836±0.017 -0.117±0.011 0.648±0.043 -0.003±0.019 137.8 0.701±0.015 -0.125±0.009 0.675±0.044 -0.003±0.015 127.4 0.578±0.013 -0.125±0.010 0.660±0.044 +0.019±0.018 117.1 0.461±0.010 -0.111±0.011 ... ... 96.3 0.320±0.008 -0.075±0.014 0.630±0.044 -0.035±0.026 86.6 0.292±0.007 0.029±0.017 ... ... 76.9 0.273±0.008 0.132±0.028 0.597±0.043 0.071±0.041 A 10% systematic error in P, due to uncertainty in beam polarization, is not included in the listed error. The cross-section measurements agree with those of Kazarinov and Simonov and with the phase-shift solution (Y-IV)np of Breit et al. but disagree with the older measurements of Guernsey, Mott, and Nelson. The polarization measurements are in satisfactory agreement with the (less accurate) results of Tinlot and Warner, but in only fair agreement with the phase-shift solution (Y-IV)np. The ratio RM, typically 0.65 ±0.04, is significantly smaller than that given by an impulse-approximation calculation, typically 0.76. The difference between polarization parameters for free and bound scattering is consistent with an impulse-approximation calculation but also consistent with zero. APS Digital Backfile Archive 1893-2003 Thomas, A. R. oth Spalding, D. oth Thorndike, E. H. oth Enthalten in The physical review Lancaster, Pa. [u.a.], 1893 167(1968), 5, Seite 1240-1249 (DE-627)NLEJ24823790X (DE-600)2177092-X 1536-6065 nnns volume:167 year:1968 number:5 pages:1240-1249 extent:10 https://www.tib.eu/de/suchen/id/aps%3Ae6f32d739ed5919e8d1b212454104ba8078b15d6 Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 167 1968 5 1240-1249 10 |
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The neutron beam used, created by charge-exchange scattering of a polarized proton beam on a deuterium target, had an energy spread of ±12 MeV, a polarization of 73%, and an intensity of 1000 n/sec. The beam polarization was determined by comparing the asymmetry measured in the reaction n+d→p+2n with the polarization of the (previously studied) charge-symmetric reaction p+d→n+2p, in which only the neutron is detected. The differential cross section σ and the polarization P, for free n-p scattering, the ratio RM of the bound to the free cross section, and the difference P-Pb between the free and bound polarization parameters are listed. θc.m. σ P RM P-Pb 158.1 1.000±0.021 -0.071±0.012 0.665±0.044 +0.027±0.018 148.1 0.836±0.017 -0.117±0.011 0.648±0.043 -0.003±0.019 137.8 0.701±0.015 -0.125±0.009 0.675±0.044 -0.003±0.015 127.4 0.578±0.013 -0.125±0.010 0.660±0.044 +0.019±0.018 117.1 0.461±0.010 -0.111±0.011 ... ... 96.3 0.320±0.008 -0.075±0.014 0.630±0.044 -0.035±0.026 86.6 0.292±0.007 0.029±0.017 ... ... 76.9 0.273±0.008 0.132±0.028 0.597±0.043 0.071±0.041 A 10% systematic error in P, due to uncertainty in beam polarization, is not included in the listed error. The cross-section measurements agree with those of Kazarinov and Simonov and with the phase-shift solution (Y-IV)np of Breit et al. but disagree with the older measurements of Guernsey, Mott, and Nelson. 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n-p differential cross section and polarization at 199 mev |
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n-p Differential Cross Section and Polarization at 199 MeV |
| abstract |
The relative differential cross sections and polarization parameters for free n-p scattering, and for the reaction n+d→p+2n in which only the proton is detected (bound n-p scattering), have been measured at an incident energy of 199 MeV, at two-nucleon c.m. angles between 77° and 158°. The neutron beam used, created by charge-exchange scattering of a polarized proton beam on a deuterium target, had an energy spread of ±12 MeV, a polarization of 73%, and an intensity of 1000 n/sec. The beam polarization was determined by comparing the asymmetry measured in the reaction n+d→p+2n with the polarization of the (previously studied) charge-symmetric reaction p+d→n+2p, in which only the neutron is detected. The differential cross section σ and the polarization P, for free n-p scattering, the ratio RM of the bound to the free cross section, and the difference P-Pb between the free and bound polarization parameters are listed. θc.m. σ P RM P-Pb 158.1 1.000±0.021 -0.071±0.012 0.665±0.044 +0.027±0.018 148.1 0.836±0.017 -0.117±0.011 0.648±0.043 -0.003±0.019 137.8 0.701±0.015 -0.125±0.009 0.675±0.044 -0.003±0.015 127.4 0.578±0.013 -0.125±0.010 0.660±0.044 +0.019±0.018 117.1 0.461±0.010 -0.111±0.011 ... ... 96.3 0.320±0.008 -0.075±0.014 0.630±0.044 -0.035±0.026 86.6 0.292±0.007 0.029±0.017 ... ... 76.9 0.273±0.008 0.132±0.028 0.597±0.043 0.071±0.041 A 10% systematic error in P, due to uncertainty in beam polarization, is not included in the listed error. The cross-section measurements agree with those of Kazarinov and Simonov and with the phase-shift solution (Y-IV)np of Breit et al. but disagree with the older measurements of Guernsey, Mott, and Nelson. The polarization measurements are in satisfactory agreement with the (less accurate) results of Tinlot and Warner, but in only fair agreement with the phase-shift solution (Y-IV)np. The ratio RM, typically 0.65 ±0.04, is significantly smaller than that given by an impulse-approximation calculation, typically 0.76. The difference between polarization parameters for free and bound scattering is consistent with an impulse-approximation calculation but also consistent with zero. |
| abstractGer |
The relative differential cross sections and polarization parameters for free n-p scattering, and for the reaction n+d→p+2n in which only the proton is detected (bound n-p scattering), have been measured at an incident energy of 199 MeV, at two-nucleon c.m. angles between 77° and 158°. The neutron beam used, created by charge-exchange scattering of a polarized proton beam on a deuterium target, had an energy spread of ±12 MeV, a polarization of 73%, and an intensity of 1000 n/sec. The beam polarization was determined by comparing the asymmetry measured in the reaction n+d→p+2n with the polarization of the (previously studied) charge-symmetric reaction p+d→n+2p, in which only the neutron is detected. The differential cross section σ and the polarization P, for free n-p scattering, the ratio RM of the bound to the free cross section, and the difference P-Pb between the free and bound polarization parameters are listed. θc.m. σ P RM P-Pb 158.1 1.000±0.021 -0.071±0.012 0.665±0.044 +0.027±0.018 148.1 0.836±0.017 -0.117±0.011 0.648±0.043 -0.003±0.019 137.8 0.701±0.015 -0.125±0.009 0.675±0.044 -0.003±0.015 127.4 0.578±0.013 -0.125±0.010 0.660±0.044 +0.019±0.018 117.1 0.461±0.010 -0.111±0.011 ... ... 96.3 0.320±0.008 -0.075±0.014 0.630±0.044 -0.035±0.026 86.6 0.292±0.007 0.029±0.017 ... ... 76.9 0.273±0.008 0.132±0.028 0.597±0.043 0.071±0.041 A 10% systematic error in P, due to uncertainty in beam polarization, is not included in the listed error. The cross-section measurements agree with those of Kazarinov and Simonov and with the phase-shift solution (Y-IV)np of Breit et al. but disagree with the older measurements of Guernsey, Mott, and Nelson. The polarization measurements are in satisfactory agreement with the (less accurate) results of Tinlot and Warner, but in only fair agreement with the phase-shift solution (Y-IV)np. The ratio RM, typically 0.65 ±0.04, is significantly smaller than that given by an impulse-approximation calculation, typically 0.76. The difference between polarization parameters for free and bound scattering is consistent with an impulse-approximation calculation but also consistent with zero. |
| abstract_unstemmed |
The relative differential cross sections and polarization parameters for free n-p scattering, and for the reaction n+d→p+2n in which only the proton is detected (bound n-p scattering), have been measured at an incident energy of 199 MeV, at two-nucleon c.m. angles between 77° and 158°. The neutron beam used, created by charge-exchange scattering of a polarized proton beam on a deuterium target, had an energy spread of ±12 MeV, a polarization of 73%, and an intensity of 1000 n/sec. The beam polarization was determined by comparing the asymmetry measured in the reaction n+d→p+2n with the polarization of the (previously studied) charge-symmetric reaction p+d→n+2p, in which only the neutron is detected. The differential cross section σ and the polarization P, for free n-p scattering, the ratio RM of the bound to the free cross section, and the difference P-Pb between the free and bound polarization parameters are listed. θc.m. σ P RM P-Pb 158.1 1.000±0.021 -0.071±0.012 0.665±0.044 +0.027±0.018 148.1 0.836±0.017 -0.117±0.011 0.648±0.043 -0.003±0.019 137.8 0.701±0.015 -0.125±0.009 0.675±0.044 -0.003±0.015 127.4 0.578±0.013 -0.125±0.010 0.660±0.044 +0.019±0.018 117.1 0.461±0.010 -0.111±0.011 ... ... 96.3 0.320±0.008 -0.075±0.014 0.630±0.044 -0.035±0.026 86.6 0.292±0.007 0.029±0.017 ... ... 76.9 0.273±0.008 0.132±0.028 0.597±0.043 0.071±0.041 A 10% systematic error in P, due to uncertainty in beam polarization, is not included in the listed error. The cross-section measurements agree with those of Kazarinov and Simonov and with the phase-shift solution (Y-IV)np of Breit et al. but disagree with the older measurements of Guernsey, Mott, and Nelson. The polarization measurements are in satisfactory agreement with the (less accurate) results of Tinlot and Warner, but in only fair agreement with the phase-shift solution (Y-IV)np. The ratio RM, typically 0.65 ±0.04, is significantly smaller than that given by an impulse-approximation calculation, typically 0.76. The difference between polarization parameters for free and bound scattering is consistent with an impulse-approximation calculation but also consistent with zero. |
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