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It is well known since long that the population of the low-lying states reached by radiative neutron capture depends significantly on the spin of the initial state. From the analysis of low-energy gamma-spectra following capture in s- and p-wave neutron resonances of (107)Ag, (109)Ag and (238)U we have found that the population of the low-lying levels depends also on the parity of the initial state. For the 2 silver isotopes there is a general tendency to populate more those levels of parity opposite to that of the initial state. To increase the effect we have computed the intensity ratios between 2 transitions de-exciting states of different parity and we have found that the ratio values split into 2 groups corresponding to s- and p-wave levels. The relative magnitude of the separation is comparable to the one related to the spin dependence. This effect can be exploited for determining the parity of neutron resonances, particularly in those cases where other methods give ambiguous results.

Additional information

Authors: CORVI F, JRC Geel (BE);ZANINI L, JRC Geel (BE);POSTMA H, Delft University of Technology (NL);GUNSING F, CEA, CEN Saclay, Gif-sur-Yvette (FR)
Bibliographic Reference: Paper presented: International Conference on Nuclear Data for Science and Technology, Trieste (IT), May 19-24, 1997
Availability: Available from (1) as paper EN 40323 ORA
Record Number: 199711072 / Last updated on: 1997-09-16
Original language: en
Available languages: en
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