Nuclear data sheets update for A = 183

Firestone, R. B.

doi:10.1016/0090-3752(92)80015-c

Cited by 48 publications

(11 citation statements)

References 96 publications

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“…Transition intensities have been corrected for absorption in the source, as discussed earlier. The multipolarities in Table V are taken from ENSDF [43] where available, or assumed based on angular-momentum selection rules, and the conversion coefficients were recalculated with BRICC [16]. Figure 3 shows the population-depopulation balance for 183 W using the corresponding σ γ information from Table V calculated with various LD and PSF models.…”

Section: A 182 W(nγ ) 183 Wmentioning

confidence: 99%

“…The 11/2 + (T 1/2 = 5.2 s) isomer at 309.49 keV [43] decays by a highly converted 102.48-keV [43] M2 transition that was not resolved from the 101.93-keV transition deexciting the 308.95-keV level and the 101.80-keV transition deexciting the 302.35-keV level in 187 W, which also contributes to the observed intensity owing to a 0.5(1)% 186 W impurity (Table I) in the measured sample. The total intensity of the triplet is ∼15(2)% of the 209.69-keV TABLE V. Experimental partial γ -ray cross sections, corresponding to both primary and secondary γ -ray transitions, measured in this work from thermal neutron capture on 182 W. Quantities in brackets represent tentative assignments.…”

Section: A 182 W(nγ ) 183 Wmentioning

confidence: 99%

“…The total intensity of the triplet is ∼15(2)% of the 209.69-keV TABLE V. Experimental partial γ -ray cross sections, corresponding to both primary and secondary γ -ray transitions, measured in this work from thermal neutron capture on 182 W. Quantities in brackets represent tentative assignments. Multipolarities, XL, in square brackets were assumed based on J angular-momentum selection rules; other values were taken from ENSDF [43]. γ -ray intensity deexciting the 308.95-keV level, which is significantly larger than 7.4(4)% observed from the same level in 183 Ta β − decay [43].…”

Section: A 182 W(nγ ) 183 Wmentioning

confidence: 99%

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Investigation of the tungsten isotopes via thermal neutron capture

et al. 2014

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Total radiative thermal neutron-capture γ -ray cross sections for the 182,183,184,186 W isotopes were measured using guided neutron beams from the Budapest Research Reactor to induce prompt and delayed γ rays from natural and isotopically-enriched tungsten targets. These cross sections were determined from the sum of measured γ -ray cross sections feeding the ground state from low-lying levels below a cutoff energy, E crit , where the level scheme is completely known, and continuum γ rays from levels above E crit , calculated using the Monte Carlo statistical-decay code DICEBOX. The new cross sections determined in this work for the tungsten nuclides are σ 0 ( 182 W) = 20.5(14) b and σ 11/2 + ( 183 W m ,5.2 s) = 0.177 (18) b; σ 0 ( 183 W) = 9.37(38) b and σ 5 − ( 184 W m ,8.33 μs) = 0.0247(55) b; σ 0 ( 184 W) = 1.43(10) b and σ 11/2 + ( 185 W m ,1.67 min) = 0.0062(16) b;and, σ 0 ( 186 W) = 33.33(62) b and σ 9/2 + ( 187 W m ,1.38 μs) = 0.400(16) b. These results are consistent with earlier measurements in the literature. The 186 W cross section was also independently confirmed from an activation measurement, following the decay of 187 W, yielding values for σ 0 ( 186 W) that are consistent with our prompt γ -ray measurement. The cross-section measurements were found to be insensitive to choice of level density or photon strength model and only weakly dependent on E crit . Total radiative-capture widths calculated with DICEBOX showed much greater model dependence; however, the recommended values could be reproduced with selected model choices. The decay schemes for all tungsten isotopes were improved in these analyses. We were also able to determine new neutron-separation energies from our primary γ -ray measurements for the respective (n,γ ) compounds: 183 W [S n = 6190.88 (6) keV]; 184 W [S n = 7411.11(13) keV]; 185 W [S n = 5753.74(5) keV]; and, 187 W [S n = 5466.62(7) keV].

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Section: A 182 W(nγ ) 183 Wmentioning

confidence: 99%

Section: A 182 W(nγ ) 183 Wmentioning

confidence: 99%

Section: A 182 W(nγ ) 183 Wmentioning

confidence: 99%

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Investigation of the tungsten isotopes via thermal neutron capture

et al. 2014

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“…(For ' Bi, both the ground-statetogroundstate n transition and the E3 Ml-(E2) y rays [10], which originate from 1.8-s ' Tl, have been seen). The adopted Tl [11]excitation energy of -550 keV, used by Coenen et ai. [5] to deduce the ' Bi energy of 60 keV, was initially derived by Schrewe et al [12] on the basis of systematics for vrd3/2 levels in heavier odd-mass Tl isotopes and an estimated energy for the E3 (9/2-3/2) transition.…”

mentioning

confidence: 99%

“…This estimate is based on the assumption that the 60(15)-ms ' Tl isomer deexcites only 3% of the time by n decay, with the remainder of its decay strength proceeding via emission of the F3 y ray. Clearly the adopted [11] and inferred [5] excitation energies for ' Tl and ' Bi™, respectively, are uncertain and therefore need to be determined experimentally.…”

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confidence: 99%

Excitation energy of the πs1/2intruder state inBi<

et al. 1995

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In a series of " Ti bombardments of ' "Sm the decay energy of the '" Bi'" (7rs «2) ct transition that proceeds to the (ms, o) ground state of ' Tl was measured to be 7.30(4) MeV. This result establishes the excitation energy of ' Bi"' as 190(40) keV rather than the adopted 92(10)-keV value. Our data indicate a leveling off in excitation energy at N= 106 for the s»z intruder state in the odd-A Bi isotopes rather than a continued drop at that neutron number as inferred by Coenen et al. in their discussion of intruder state systematics in the Pb region. Consequences of this discrepancy for the adopted excitation energy of the~s i/2 isomer in ' Bi are discussed.PACS number(s): 21.10.Pc, 23.60.+e, 27.70.+q

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74-Tungsten

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Nuclear data sheets update for A = 183

Cited by 48 publications

References 96 publications

Investigation of the tungsten isotopes via thermal neutron capture

Investigation of the tungsten isotopes via thermal neutron capture

Excitation energy of the πs1/2intruder state inBi<

74-Tungsten

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