Radiative Muon Capture in Ca40 and the Induced Pseudoscalar Coupling Constant
The process μ-+p→n+ν+γ, where p is a proton in Ca40, was observed by detecting the γ ray in a large NaI crystal. Only that part of the γ-ray spectrum lying above 60 MeV was analyzable because of large backgrounds at lower energies. The γ-ray spectrum is predicted theoretically to be rather sensitive...
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1964 |
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Online-Ressource 15 |
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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, 136.1964, 4B, B1077-, (15 S.) |
| Übergeordnetes Werk: |
volume:136 ; year:1964 ; number:4B ; pages:1077-1091 ; extent:15 |
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| 520 | |a The process μ-+p→n+ν+γ, where p is a proton in Ca40, was observed by detecting the γ ray in a large NaI crystal. Only that part of the γ-ray spectrum lying above 60 MeV was analyzable because of large backgrounds at lower energies. The γ-ray spectrum is predicted theoretically to be rather sensitive to the value of gP, the induced pseudoscalar coupling constant. Under the assumption that the pseudoscalar terms are induced by one-pion intermediate states only, the results of the experiment, as interpreted with the theory of Rood and Tolhoek, indicate that gP=(13.3±2.7)gA, where gA is the axial vector coupling constant, and the error does not include the uncertainty in the theory. This value is two standard deviations larger than the predicted value of (7 or 8)gA. The discrepancy may be statistical or the result of inadequacies in the theory describing the process. Alternative explanations can also be found. For example, one can assume that there actually is an excess ΔgP above that expected; assuming this excess to be independent of q2 (q=four-momentumtransfer) our data give ΔgP=(10.4±5.6)gA. Another possible explanation would be to drop the usual assumption that the weak currents have a definite transformation character under G parity, so that a tensor term (with gT≳15gV) appears in the axial vector part of the weak current. Using the theory to extrapolate the γ-ray spectrum to low energies, a value of (3.1±0.6)×10-4 was obtained for the ratio of radiative to ordinary muon capture. It was found that the average excitation energy given to the K40 nucleus is (15±4) MeV. | ||
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(DE-627)NLEJ251618617 (DE-601)aps:2cf7162fcd3e51c69de74ef2ee7b62a5688ed83b DE-627 ger DE-627 rakwb Radiative Muon Capture in Ca40 and the Induced Pseudoscalar Coupling Constant 1964 Online-Ressource 15 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The process μ-+p→n+ν+γ, where p is a proton in Ca40, was observed by detecting the γ ray in a large NaI crystal. Only that part of the γ-ray spectrum lying above 60 MeV was analyzable because of large backgrounds at lower energies. The γ-ray spectrum is predicted theoretically to be rather sensitive to the value of gP, the induced pseudoscalar coupling constant. Under the assumption that the pseudoscalar terms are induced by one-pion intermediate states only, the results of the experiment, as interpreted with the theory of Rood and Tolhoek, indicate that gP=(13.3±2.7)gA, where gA is the axial vector coupling constant, and the error does not include the uncertainty in the theory. This value is two standard deviations larger than the predicted value of (7 or 8)gA. The discrepancy may be statistical or the result of inadequacies in the theory describing the process. Alternative explanations can also be found. For example, one can assume that there actually is an excess ΔgP above that expected; assuming this excess to be independent of q2 (q=four-momentumtransfer) our data give ΔgP=(10.4±5.6)gA. Another possible explanation would be to drop the usual assumption that the weak currents have a definite transformation character under G parity, so that a tensor term (with gT≳15gV) appears in the axial vector part of the weak current. Using the theory to extrapolate the γ-ray spectrum to low energies, a value of (3.1±0.6)×10-4 was obtained for the ratio of radiative to ordinary muon capture. It was found that the average excitation energy given to the K40 nucleus is (15±4) MeV. APS Digital Backfile Archive 1893-2003 Conversi, M. oth Diebold, R. oth di Lella, L. oth Enthalten in The physical review Lancaster, Pa. [u.a.], 1893 136.1964, 4B, B1077-, (15 S.) (DE-627)NLEJ24823790X (DE-600)2177092-X 1536-6065 nnns volume:136 year:1964 number:4B pages:1077-1091 extent:15 https://www.tib.eu/de/suchen/id/aps%3A2cf7162fcd3e51c69de74ef2ee7b62a5688ed83b Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 136 1964 4B 1077-1091 15 136.1964, 4B, B1077-, (15 S.) |
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(DE-627)NLEJ251618617 (DE-601)aps:2cf7162fcd3e51c69de74ef2ee7b62a5688ed83b DE-627 ger DE-627 rakwb Radiative Muon Capture in Ca40 and the Induced Pseudoscalar Coupling Constant 1964 Online-Ressource 15 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The process μ-+p→n+ν+γ, where p is a proton in Ca40, was observed by detecting the γ ray in a large NaI crystal. Only that part of the γ-ray spectrum lying above 60 MeV was analyzable because of large backgrounds at lower energies. The γ-ray spectrum is predicted theoretically to be rather sensitive to the value of gP, the induced pseudoscalar coupling constant. Under the assumption that the pseudoscalar terms are induced by one-pion intermediate states only, the results of the experiment, as interpreted with the theory of Rood and Tolhoek, indicate that gP=(13.3±2.7)gA, where gA is the axial vector coupling constant, and the error does not include the uncertainty in the theory. This value is two standard deviations larger than the predicted value of (7 or 8)gA. The discrepancy may be statistical or the result of inadequacies in the theory describing the process. Alternative explanations can also be found. For example, one can assume that there actually is an excess ΔgP above that expected; assuming this excess to be independent of q2 (q=four-momentumtransfer) our data give ΔgP=(10.4±5.6)gA. Another possible explanation would be to drop the usual assumption that the weak currents have a definite transformation character under G parity, so that a tensor term (with gT≳15gV) appears in the axial vector part of the weak current. Using the theory to extrapolate the γ-ray spectrum to low energies, a value of (3.1±0.6)×10-4 was obtained for the ratio of radiative to ordinary muon capture. It was found that the average excitation energy given to the K40 nucleus is (15±4) MeV. APS Digital Backfile Archive 1893-2003 Conversi, M. oth Diebold, R. oth di Lella, L. oth Enthalten in The physical review Lancaster, Pa. [u.a.], 1893 136.1964, 4B, B1077-, (15 S.) (DE-627)NLEJ24823790X (DE-600)2177092-X 1536-6065 nnns volume:136 year:1964 number:4B pages:1077-1091 extent:15 https://www.tib.eu/de/suchen/id/aps%3A2cf7162fcd3e51c69de74ef2ee7b62a5688ed83b Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 136 1964 4B 1077-1091 15 136.1964, 4B, B1077-, (15 S.) |
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(DE-627)NLEJ251618617 (DE-601)aps:2cf7162fcd3e51c69de74ef2ee7b62a5688ed83b DE-627 ger DE-627 rakwb Radiative Muon Capture in Ca40 and the Induced Pseudoscalar Coupling Constant 1964 Online-Ressource 15 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The process μ-+p→n+ν+γ, where p is a proton in Ca40, was observed by detecting the γ ray in a large NaI crystal. Only that part of the γ-ray spectrum lying above 60 MeV was analyzable because of large backgrounds at lower energies. The γ-ray spectrum is predicted theoretically to be rather sensitive to the value of gP, the induced pseudoscalar coupling constant. Under the assumption that the pseudoscalar terms are induced by one-pion intermediate states only, the results of the experiment, as interpreted with the theory of Rood and Tolhoek, indicate that gP=(13.3±2.7)gA, where gA is the axial vector coupling constant, and the error does not include the uncertainty in the theory. This value is two standard deviations larger than the predicted value of (7 or 8)gA. The discrepancy may be statistical or the result of inadequacies in the theory describing the process. Alternative explanations can also be found. For example, one can assume that there actually is an excess ΔgP above that expected; assuming this excess to be independent of q2 (q=four-momentumtransfer) our data give ΔgP=(10.4±5.6)gA. Another possible explanation would be to drop the usual assumption that the weak currents have a definite transformation character under G parity, so that a tensor term (with gT≳15gV) appears in the axial vector part of the weak current. Using the theory to extrapolate the γ-ray spectrum to low energies, a value of (3.1±0.6)×10-4 was obtained for the ratio of radiative to ordinary muon capture. It was found that the average excitation energy given to the K40 nucleus is (15±4) MeV. APS Digital Backfile Archive 1893-2003 Conversi, M. oth Diebold, R. oth di Lella, L. oth Enthalten in The physical review Lancaster, Pa. [u.a.], 1893 136.1964, 4B, B1077-, (15 S.) (DE-627)NLEJ24823790X (DE-600)2177092-X 1536-6065 nnns volume:136 year:1964 number:4B pages:1077-1091 extent:15 https://www.tib.eu/de/suchen/id/aps%3A2cf7162fcd3e51c69de74ef2ee7b62a5688ed83b Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 136 1964 4B 1077-1091 15 136.1964, 4B, B1077-, (15 S.) |
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(DE-627)NLEJ251618617 (DE-601)aps:2cf7162fcd3e51c69de74ef2ee7b62a5688ed83b DE-627 ger DE-627 rakwb Radiative Muon Capture in Ca40 and the Induced Pseudoscalar Coupling Constant 1964 Online-Ressource 15 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The process μ-+p→n+ν+γ, where p is a proton in Ca40, was observed by detecting the γ ray in a large NaI crystal. Only that part of the γ-ray spectrum lying above 60 MeV was analyzable because of large backgrounds at lower energies. The γ-ray spectrum is predicted theoretically to be rather sensitive to the value of gP, the induced pseudoscalar coupling constant. Under the assumption that the pseudoscalar terms are induced by one-pion intermediate states only, the results of the experiment, as interpreted with the theory of Rood and Tolhoek, indicate that gP=(13.3±2.7)gA, where gA is the axial vector coupling constant, and the error does not include the uncertainty in the theory. This value is two standard deviations larger than the predicted value of (7 or 8)gA. The discrepancy may be statistical or the result of inadequacies in the theory describing the process. Alternative explanations can also be found. For example, one can assume that there actually is an excess ΔgP above that expected; assuming this excess to be independent of q2 (q=four-momentumtransfer) our data give ΔgP=(10.4±5.6)gA. Another possible explanation would be to drop the usual assumption that the weak currents have a definite transformation character under G parity, so that a tensor term (with gT≳15gV) appears in the axial vector part of the weak current. Using the theory to extrapolate the γ-ray spectrum to low energies, a value of (3.1±0.6)×10-4 was obtained for the ratio of radiative to ordinary muon capture. It was found that the average excitation energy given to the K40 nucleus is (15±4) MeV. APS Digital Backfile Archive 1893-2003 Conversi, M. oth Diebold, R. oth di Lella, L. oth Enthalten in The physical review Lancaster, Pa. [u.a.], 1893 136.1964, 4B, B1077-, (15 S.) (DE-627)NLEJ24823790X (DE-600)2177092-X 1536-6065 nnns volume:136 year:1964 number:4B pages:1077-1091 extent:15 https://www.tib.eu/de/suchen/id/aps%3A2cf7162fcd3e51c69de74ef2ee7b62a5688ed83b Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 136 1964 4B 1077-1091 15 136.1964, 4B, B1077-, (15 S.) |
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(DE-627)NLEJ251618617 (DE-601)aps:2cf7162fcd3e51c69de74ef2ee7b62a5688ed83b DE-627 ger DE-627 rakwb Radiative Muon Capture in Ca40 and the Induced Pseudoscalar Coupling Constant 1964 Online-Ressource 15 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The process μ-+p→n+ν+γ, where p is a proton in Ca40, was observed by detecting the γ ray in a large NaI crystal. Only that part of the γ-ray spectrum lying above 60 MeV was analyzable because of large backgrounds at lower energies. The γ-ray spectrum is predicted theoretically to be rather sensitive to the value of gP, the induced pseudoscalar coupling constant. Under the assumption that the pseudoscalar terms are induced by one-pion intermediate states only, the results of the experiment, as interpreted with the theory of Rood and Tolhoek, indicate that gP=(13.3±2.7)gA, where gA is the axial vector coupling constant, and the error does not include the uncertainty in the theory. This value is two standard deviations larger than the predicted value of (7 or 8)gA. The discrepancy may be statistical or the result of inadequacies in the theory describing the process. Alternative explanations can also be found. For example, one can assume that there actually is an excess ΔgP above that expected; assuming this excess to be independent of q2 (q=four-momentumtransfer) our data give ΔgP=(10.4±5.6)gA. Another possible explanation would be to drop the usual assumption that the weak currents have a definite transformation character under G parity, so that a tensor term (with gT≳15gV) appears in the axial vector part of the weak current. Using the theory to extrapolate the γ-ray spectrum to low energies, a value of (3.1±0.6)×10-4 was obtained for the ratio of radiative to ordinary muon capture. It was found that the average excitation energy given to the K40 nucleus is (15±4) MeV. APS Digital Backfile Archive 1893-2003 Conversi, M. oth Diebold, R. oth di Lella, L. oth Enthalten in The physical review Lancaster, Pa. [u.a.], 1893 136.1964, 4B, B1077-, (15 S.) (DE-627)NLEJ24823790X (DE-600)2177092-X 1536-6065 nnns volume:136 year:1964 number:4B pages:1077-1091 extent:15 https://www.tib.eu/de/suchen/id/aps%3A2cf7162fcd3e51c69de74ef2ee7b62a5688ed83b Verlag Deutschlandweit zugänglich GBV_USEFLAG_U ZDB-1-APS GBV_NL_ARTICLE AR 136 1964 4B 1077-1091 15 136.1964, 4B, B1077-, (15 S.) |
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Radiative Muon Capture in Ca40 and the Induced Pseudoscalar Coupling Constant |
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The process μ-+p→n+ν+γ, where p is a proton in Ca40, was observed by detecting the γ ray in a large NaI crystal. Only that part of the γ-ray spectrum lying above 60 MeV was analyzable because of large backgrounds at lower energies. The γ-ray spectrum is predicted theoretically to be rather sensitive to the value of gP, the induced pseudoscalar coupling constant. Under the assumption that the pseudoscalar terms are induced by one-pion intermediate states only, the results of the experiment, as interpreted with the theory of Rood and Tolhoek, indicate that gP=(13.3±2.7)gA, where gA is the axial vector coupling constant, and the error does not include the uncertainty in the theory. This value is two standard deviations larger than the predicted value of (7 or 8)gA. The discrepancy may be statistical or the result of inadequacies in the theory describing the process. Alternative explanations can also be found. For example, one can assume that there actually is an excess ΔgP above that expected; assuming this excess to be independent of q2 (q=four-momentumtransfer) our data give ΔgP=(10.4±5.6)gA. Another possible explanation would be to drop the usual assumption that the weak currents have a definite transformation character under G parity, so that a tensor term (with gT≳15gV) appears in the axial vector part of the weak current. Using the theory to extrapolate the γ-ray spectrum to low energies, a value of (3.1±0.6)×10-4 was obtained for the ratio of radiative to ordinary muon capture. It was found that the average excitation energy given to the K40 nucleus is (15±4) MeV. |
| abstractGer |
The process μ-+p→n+ν+γ, where p is a proton in Ca40, was observed by detecting the γ ray in a large NaI crystal. Only that part of the γ-ray spectrum lying above 60 MeV was analyzable because of large backgrounds at lower energies. The γ-ray spectrum is predicted theoretically to be rather sensitive to the value of gP, the induced pseudoscalar coupling constant. Under the assumption that the pseudoscalar terms are induced by one-pion intermediate states only, the results of the experiment, as interpreted with the theory of Rood and Tolhoek, indicate that gP=(13.3±2.7)gA, where gA is the axial vector coupling constant, and the error does not include the uncertainty in the theory. This value is two standard deviations larger than the predicted value of (7 or 8)gA. The discrepancy may be statistical or the result of inadequacies in the theory describing the process. Alternative explanations can also be found. For example, one can assume that there actually is an excess ΔgP above that expected; assuming this excess to be independent of q2 (q=four-momentumtransfer) our data give ΔgP=(10.4±5.6)gA. Another possible explanation would be to drop the usual assumption that the weak currents have a definite transformation character under G parity, so that a tensor term (with gT≳15gV) appears in the axial vector part of the weak current. Using the theory to extrapolate the γ-ray spectrum to low energies, a value of (3.1±0.6)×10-4 was obtained for the ratio of radiative to ordinary muon capture. It was found that the average excitation energy given to the K40 nucleus is (15±4) MeV. |
| abstract_unstemmed |
The process μ-+p→n+ν+γ, where p is a proton in Ca40, was observed by detecting the γ ray in a large NaI crystal. Only that part of the γ-ray spectrum lying above 60 MeV was analyzable because of large backgrounds at lower energies. The γ-ray spectrum is predicted theoretically to be rather sensitive to the value of gP, the induced pseudoscalar coupling constant. Under the assumption that the pseudoscalar terms are induced by one-pion intermediate states only, the results of the experiment, as interpreted with the theory of Rood and Tolhoek, indicate that gP=(13.3±2.7)gA, where gA is the axial vector coupling constant, and the error does not include the uncertainty in the theory. This value is two standard deviations larger than the predicted value of (7 or 8)gA. The discrepancy may be statistical or the result of inadequacies in the theory describing the process. Alternative explanations can also be found. For example, one can assume that there actually is an excess ΔgP above that expected; assuming this excess to be independent of q2 (q=four-momentumtransfer) our data give ΔgP=(10.4±5.6)gA. Another possible explanation would be to drop the usual assumption that the weak currents have a definite transformation character under G parity, so that a tensor term (with gT≳15gV) appears in the axial vector part of the weak current. Using the theory to extrapolate the γ-ray spectrum to low energies, a value of (3.1±0.6)×10-4 was obtained for the ratio of radiative to ordinary muon capture. It was found that the average excitation energy given to the K40 nucleus is (15±4) MeV. |
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Radiative Muon Capture in Ca40 and the Induced Pseudoscalar Coupling Constant |
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