Cross Sections for n+89Y for En&lt; 20 MeV

Garrett, P. E.; Ormand, W E; Younes, W.; Becker, J. A.; Bernstein, L. A.; Nelson, R. O.; Devlin, M.; Fotiades, N

doi:10.2172/15004538

Cited by 4 publications

(3 citation statements)

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“…Figure 25 shows our new evaluated results for the 89 Y(n, 2n) reactions to the ground state and m1, m2 isomers. The GEANIE detector was used to obtain a partial cross section for the production of these states, through measurement of individual gamma-ray transitions that feed these states [61]. Unmeasured contributions (e.g.…”

Section: A Yttrium Cross Sectionmentioning

confidence: 99%

Evaluated Iridium, Yttrium, and Thulium Cross Sections and Integral Validation Against Critical Assembly and Bethe Sphere Measurements

Chadwick

Frankle

Trellue

et al. 2007

Nuclear Data Sheets

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Section: A Yttrium Cross Sectionmentioning

confidence: 99%

Evaluated Iridium, Yttrium, and Thulium Cross Sections and Integral Validation Against Critical Assembly and Bethe Sphere Measurements

Chadwick

Frankle

Trellue

et al. 2007

Nuclear Data Sheets

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“…In 1996 an initiative was taken to extend such studies to other nuclei and the data reported here are part of this program of measurements which use the Germanium Array for Neutron-Induced Excitations (GEANIE) [9]. Results from other similar studies (both with GEANIE and before GEANIE) include data taken on samples of 207,208 Pb [8], 27 Al [10], 196 Pt [11][12][13], 48 Ti [14,15], 92 Mo [16,17], 89 Y [18], 90 Zr [18,19], 150 Sm [20], 239 Pu [21], 238 U [22], and 235 U [23]. For this effort Ge and BGO detectors of the former HERA spectrometer at LBNL [24] were transferred to LANL for a joint LANL/LLNL project.…”

Section: Introductionmentioning

confidence: 99%

Feeding of the11/2−isomers in stable Ir and Au isotopes

et al. 2009

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Excited states in 191 Ir, 193 Ir, and 197 Au were studied and absolute partial γ -ray cross sections were measured using the (n,n γ ) reaction. A Compton-suppressed germanium-detector array (GEANIE) for γ -ray spectroscopy was used for the measurement and the broad-spectrum pulsed neutron source of the Los Alamos Neutron Science Center's WNR facility provided energetic neutrons. The energy of the incident neutrons was determined using the time-of-flight technique. Absolute partial γ -ray cross sections were measured up to incident neutron energy of 20 MeV for several transitions feeding directly the 11/2 − isomers and ground states in 191 Ir, 193 Ir, and 197 Au. The feeding of the 11/2 − isomers, which originate from the odd proton occupying the h 11/2 orbital, was found for the three targets to be very similar and increasing relative to the feeding of the corresponding ground state with increasing neutron energy up to E n ∼ 10 MeV. Above this neutron energy the opening of the (n,2n) reaction channel strongly affects the population of the isomers and leads to a decrease of their relative population compared to the population of the ground states. The experimental results are compared with theoretical predictions from the GNASH reaction model calculation implementing a version of the spin distribution for the pre-equilibrium reaction piece with either a compound nucleus spin distribution (CN-GNASH) or a Feshbach-Kerman-Koonin (FKK-GNASH) quantum mechanical spin distribution. The effects of the spin cutoff parameter values on the population of states are examined. Evidence is presented that FKK-GNASH provides a description of the experimental data that mitigates the need for adjustment of the level density parameter to fit the data.

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“…This paper presents the results of a recent experiment to investigate the discrepancy by measuring the 150 Sm(n,2n) 149 Sm reaction cross section via a different technique [4][5][6][7][8][9][10][11]. First, partial γ-ray cross sections, 150 Sm(n,2nγi) 149 Sm, were measured using the GErmanium Array for Neutron-Induced Excitations (GEANIE) [12,13], located at the Weapons Neutron Research (WNR) facility [14] at the Los Alamos Neutron Science CEnter (LANSCE).…”

Section: Introductionmentioning

confidence: 99%

Measurement of 150-Sm(n,2ngammai) 149-Sm cross sections between threshold and 20 MeV

Cooper¹,

Becker²,

Dashdorj³

et al. 2004

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Absolute partial γ-ray cross sections for the production of discrete γ-rays from the reaction 150 Sm(n,2nγi) 149 Sm were measured using the GEANIE γ-ray spectrometer coupled with the intense white neutron source at WNR/LANSCE. The measurements were made for incident neutron energies between threshold (8.04 MeV) and 20 MeV. The partial cross sections for 21 γ-rays were extracted from the data. Of these, 17 were compared to calculations performed using the enhanced Hauser-Feshbach code STAPRE. The partial γ−ray cross sections of the observed parallel decay paths to the ground state were summed, forming a lower bound for the (n,2n) reaction channel. A combination of theory and experiment was then used to deduce the (n,2n) reaction channel cross section.

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Cross Sections for n+89Y for En< 20 MeV

Cited by 4 publications

References 0 publications

Evaluated Iridium, Yttrium, and Thulium Cross Sections and Integral Validation Against Critical Assembly and Bethe Sphere Measurements

Evaluated Iridium, Yttrium, and Thulium Cross Sections and Integral Validation Against Critical Assembly and Bethe Sphere Measurements

Feeding of the11/2−isomers in stable Ir and Au isotopes

Measurement of 150-Sm(n,2ngammai) 149-Sm cross sections between threshold and 20 MeV

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