Determination of 147Sm and 148Sm resonance parameters

Георгиев, Г.; Zamyatnin, Yu. S.; Pikelner, L.B.; Muradian, G.V.; Grigoriev, Yuri V.; Madjarski, T.; Janeva, N.

doi:10.1016/0375-9474(93)90050-8

Cited by 18 publications

(18 citation statements)

References 5 publications

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“…However, as demonstrated in Ref. [8] the remaining ≈ 10% difference in average multiplicity for the two spins still is measurable and independent of resonance energy and was used to determine spins of 91 147 Sm+n resonances below 900 eV.…”

Section: Introductionmentioning

confidence: 94%

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Spin measurements forSm147+nresonances: Further evidence for nonstatistical effects

et al. 2007

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We have determined the spins J of resonances in the 147 Sm(n, γ) reaction by measuring multiplicities of γ-ray cascades following neutron capture. Using this technique, we were able to determine J values for all but 14 of the 140 known resonances below E n = 1 keV, including 41 firm J assignments for resonances whose spins previously were either unknown or tentative. These new spin assignments, together with previously determined resonance parameters, allowed us to eV from an analysis of 147 Sm(n,α) data, we divided the data into two regions; 0 < E n < 350 eV and 350 < E n < 700 eV. Using neutron widths from a previous measurement (corrected for new unresolved doublets identified in this work) and published techniques for correcting for missed resonances and for testing whether data are consistent with a Porter-Thomas distribution, we found that the Γ 0 n distribution for resonances below 350 eV is consistent with the expected PorterThomas distribution. On the other hand, we found that Γ 0 n data in the 350 < E n < 700 eV region are inconsistent with a Porter-Thomas distribution, but in good agreement with a χ 2 distribution having ν ≥ 2 We discuss possible explanations for these observed non-statistical effects and their possible relation to similar effects previously observed in other nuclides. * Electronic address: koehlerpe@ornl.gov 2

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Section: Introductionmentioning

confidence: 94%

“…The spin assignments from Ref. [8] were used in Ref. [2] in an R-matrix analysis of the 147 Sm(n, α) data of Ref.…”

Section: Introductionmentioning

confidence: 99%

Spin measurements forSm147+nresonances: Further evidence for nonstatistical effects

et al. 2007

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“…[21] and for 149 Sm Γ γ = 45 meV from Ref. [22] is used. A detailed description of the normalization of the γ-strength functions is given in Ref.…”

Section: B Gamma-strength Functionmentioning

confidence: 99%

Level densities andγ-strength functions in148,149Sm

et al. 2002

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“…The average multiplicity is expected to be different for J − than for J + . This conjecture was established [1,2,3] by Monte Carlo simulations of the gamma-cascades following neutron capture. The J-spin effect on multiplicity, although not large for Mo, (∆M J / < M >∼ 7%), results in the separation of M J values of s-wave resonances into two different groups, corresponding to the two possible spin values J + = 3 and J − = 2.…”

Section: Methodsmentioning

confidence: 94%

“…Each crystal has a length of 15 cm, with an inner radius of 17 cm for the ball. The area of each crystal facing the target is ≃ 23 cm 2 ; the volume of each crystal is 734 cm 3 . Neutrons scattered into the detector can be captured on the barium isotopes and produce an undesirable background.…”

Section: Methodsmentioning

confidence: 99%

Neutron capture reactions on Mo and Gd isotopes using the DANCE array

Mitchell¹

2008

Proceedings of Workshop on Photon Strength Functions and Related Topics — PoS(PSF07)

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The γ rays following the 94,95 Mo(n, γ)Mo reactions have been studied by the time-of-flight method with the DANCE (Detector for Advanced Neutron Capture Experiments) array of 160 BaF 2 scintillation detectors at the Los Alamos Neutron Science Center. The targets were enriched samples. The γ-ray multiplicities and energy spectra for different multiplicities were measured in s-and p-wave resonances up to E n = 10 keV for 94 Mo and up to E n = 2 keV for 95 Mo. Preliminary analysis assigned definite spins and parities in 96 Mo for about 60% of the resonances, while tentative spins and parities were assigned for the rest of observed resonances. In 95 Mo the parities were determined for the observed resonances, confirming previously known assignments. Workshop on Photon Strength Functions and Related Topics

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Determination of 147Sm and 148Sm resonance parameters

Cited by 18 publications

References 5 publications

Spin measurements forSm147+nresonances: Further evidence for nonstatistical effects

Spin measurements forSm147+nresonances: Further evidence for nonstatistical effects

Level densities andγ-strength functions in148,149Sm

Neutron capture reactions on Mo and Gd isotopes using the DANCE array

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