Measurement of the angular distribution of γ-rays after neutron capture by 139La for a T-violation search
Parity violating effects enhanced by up to 106 times compared to proton-proton scattering have been observed in several neutron capture induced compound nuclei. This enhancement is explained as an interference between an s-wave and a p-wave amplitude (s-p mixing). Theory predicts that this mechanism...
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Published in | EPJ Web of Conferences Vol. 219; p. 09001 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , |
Format | Conference Proceeding Journal Article |
Language | English |
Published |
Les Ulis
EDP Sciences
01.01.2019
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Subjects | |
Online Access | Get full text |
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Summary: | Parity violating effects enhanced by up to 106 times compared to proton-proton scattering have been observed in several neutron capture induced compound nuclei. This enhancement is explained as an interference between an s-wave and a p-wave amplitude (s-p mixing). Theory predicts that this mechanism can also enhance T-violating effects. For estimation of this enhancement in a promising candidate nucleus, we measured the angular distribution of γ-rays in the (n,γ) reaction induced in a 139La target. Experiments were performed at J-PARC, using a germanium detector array at an intense neutron beam. Analysis of the observed angular dependence around the 0.74 eV p-wave resonance allowed us to determine the ratio of the partial p-wave neutron width to the total neutron width in the entrance channel of the compound nucleus. We also report our development of a 3He spin filter needed as an epithermal-neutron polarizer for the T-violation search. |
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ISSN: | 2101-6275 2100-014X |
DOI: | 10.1051/epjconf/201921909001 |