Interaction of thermal neutrons with152mEu nuclei

Kondurov, I.A.; Berestovoi, A.M.; Egorov, A. I.; Korotkikh, E. M.; Petrov, Yu. V.

doi:10.1007/bf01123119

Cited by 6 publications

(9 citation statements)

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“…However, it has been suggested by Petrov [1] and Miyano and Morinaga [2] that neutrons may be accelerated by inelastic scattering at excited states (isomeric states) of nuclei. This reaction was observed for the first time in 1980 by Kondurov, Korotkikh and Petrov [3]. They produced the 46keV 0-isomer aS2Eu m by neutron capture and measured 46 keV neutrons during the irradiation of X52Eu~ with thermal neutrons.…”

Section: Introductionmentioning

confidence: 87%

Cross sections and ?-rays from multiple neutron capture in151Eu

1985

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Primary capture gamma rays following multiple neutron capture in 151Eu have been measured as a function of the irradiation time. Neutron capture cross sections of the ~52Eu 3-groundstate and of the 15ZEu 0-isomer (T~/2 =9.3h) were determined. These cross sections are relevant for the interpretation of inelastic scattering of neutrons at isomeric states with energy gain (neutron acceleration). The level scheme of 153Eu has been extended. Neutron binding energies of ~ 5ZEu, 153Eu ' 153Gd and z 54Gd are given.

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Section: Introductionmentioning

confidence: 87%

Cross sections and ?-rays from multiple neutron capture in151Eu

1985

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“…In this reaction, the nucleus transfers part of its excitation energy to the scattered neutron. Predicted since 1959 [1], this process was observed 20 years later on two isomeric nuclei, 152 Eu m [2] and 180 Hf m [3]. The effect of this neutron-induced de-excitation is known in nuclear astrophysics to take place in the s-process nucleosynthesis [4][5][6][7].…”

Section: Introductionmentioning

confidence: 98%

Direct evidence for inelastic neutron “acceleration” byLu177m

et al. 2011

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The inelastic neutron acceleration cross section on the long-lived metastable state of 177 Lu has been measured using a direct method. High-energy neutrons have been detected using a specially designed setup placed on a cold neutron beam extracted from the ORPHEE reactor in Saclay. The 146 ± 19 b inelastic neutron acceleration cross section in the ORPHEE cold neutron flux confirms the high cross section for this process on the 177 Lu m isomer. The deviation from the 258 ± 58 b previously published obtained for a Maxwellian neutron flux at a 323 K temperature could be explained by the presence of a low energy resonance. Resonance parameters are deduced and discussed.

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“…Contrary to the first two measurements on 152m Eu [8] and 180m Hf [9] we want to measure the outgoing neutron energies in order to identify the involved transitions in the exit channel.…”

Section: Direct Measurementmentioning

confidence: 99%

“…The thermal neutron inelastic acceleration or super-elastic scattering, where some isomer energy is retrieved by the neutron, could be such a process, since the K number is expected to play no role [7] in the decay of the compound nucleus it goes through. Before this work, this process has been measured only two times for 152m Eu [8] and 180m Hf [9].…”

Section: Introductionmentioning

confidence: 99%

Indirect and direct measurement of thermal neutron acceleration by inelastic scattering on the ¹⁷⁷Lu isomer

Bélier

Roig

Méot

et al. 2007

Nd2007

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Abstract. When neutrons interact with isomers these last can be de-excited. In such a reaction the outgoing neutron has an energy greater than the ingoing one. This process is referred as Inelastic Neutron Acceleration or Superelastic Scattering. Up to now this process was observed for only two nucleus, 152m Eu and 180m Hf by measuring the number of fast neutron produced by isomeric targets irradiated with thermal neutrons. In these works the energies of the accelerated neutrons were not measured. This report presents an indirect measurement of inelastic neutron acceleration on 177m Lu, based on the burn-up and the radiative capture cross sections measurements. Since at thermal energies the inelastic scattering and the radiative capture are the only processes that contribute to the isomer burn-up, the inelastic cross section can be deduced from the difference between the two measured quantities. Applying this method for the 177 Lu isomer with different neutron fluxes we obtained a value of 258 (58) barns, and determined that there is no integral resonance for this process. In addition the radiative capture cross section on 177g Lu was measured with a much better accuracy than the accepted value. Since the acceleration cross section is quite high a direct measurement of this process was undertaken, sending thermal neutrons and measuring the fast neutrons. The main goal now is to measure the outgoing neutron energies in order to identify the neutron transitions in the exit channel. In particular the K conservation question can be addressed by such a measurement.

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Interaction of thermal neutrons with152mEu nuclei

Cited by 6 publications

References 1 publication

Cross sections and ?-rays from multiple neutron capture in151Eu

Cross sections and ?-rays from multiple neutron capture in151Eu

Direct evidence for inelastic neutron “acceleration” byLu177m

Indirect and direct measurement of thermal neutron acceleration by inelastic scattering on the ¹⁷⁷Lu isomer

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Interaction of thermal neutrons with152mEu nuclei

Cited by 6 publications

References 1 publication

Cross sections and ?-rays from multiple neutron capture in151Eu

Cross sections and ?-rays from multiple neutron capture in151Eu

Direct evidence for inelastic neutron “acceleration” byLu177m

Indirect and direct measurement of thermal neutron acceleration by inelastic scattering on the 177Lu isomer

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Product

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Indirect and direct measurement of thermal neutron acceleration by inelastic scattering on the ¹⁷⁷Lu isomer