Details

Autor(en) / Beteiligte

• HARADA, Hideo
• NAKAMURA, Shoji
• OHTA, Masayuki
• FUJII, Toshiyuki
• YAMANA, Hajimu

Titel

Emission probabilities of gamma rays from the decay of 233Pa and 238Np, and the thermal neutron capture cross section of 237Np

Ist Teil von

• Journal of nuclear science and technology, 2006-11, Vol.43 (11), p.1289-1297

Ort / Verlag

Tokyo: Atomic Energy Society of Japan

Erscheinungsjahr

2006

Quelle

Taylor & Francis

Beschreibungen/Notizen

• In order to determine the thermal neutron capture cross section of 237Np, the relevant γ emission probabilities of the 312-keV γ-ray from the decay of 233Pa and the 984-keV γ-ray from the decay of 238Np are deduced from the ratio of the emission rate to the activity. The emission rate and activity are measured with a Ge detector and a Si detector, respectively. The measured emission probability for 312-keV γ-ray is 41.6±0.9% and that for 984-keV γ-ray is 25.2±0.5%. The emission probabilities are used to correct the thermal neutron capture cross section of 237Np reported previously, and gives 168±6 b. The neutron capture cross section is also determined as 169±6 b by α-ray spectroscopic method. The measured emission probabilities and capture cross section are compared with others from references. By averaging these values deduced by different methods, the value of 169±4 b is recommended as the thermal neutron capture cross section of 237Np for 2,200 m/s neutrons.