Nuclear Data Sheets for A = 240

Singh, Balraj; Browne, E.

doi:10.1016/j.nds.2008.09.002

Cited by 40 publications

(43 citation statements)

References 185 publications

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“…The contaminant peak appearing at an energy of around 6.11 MeV was attributed to 242 Cm (E α = 6.110(3) MeV [18]) originating from the α-decay chain starting from 254 No that was produced in a preceding experiment, and was present in the detector prior to this experiment. The other peaks in the measured spectra were assigned to 244 Cf (E α = 7.21(2) MeV, T 1/2 = 19.4(6) min reported in [19] and E α = 7.207(2) MeV, T 1/2 = 20.4(16) min in [20]), 243 Cf (E α = 7.05(2) MeV, T 1/2 = 10.3(5) min reported in [19] and E α = 7.06(1), 7.17(1) MeV, T 1/2 = 12.5(10) min in [20]) and 240 Cm (E α = 6.290(5) MeV, T 1/2 = 27(1) d [21]) based on their α-particle energies and the observed half-lives (see Section III A). The aforementioned α-particle energies and half-lives are from the literature.…”

Section: Resultsmentioning

confidence: 92%

In-beam spectroscopic study of Cf244

Konki¹,

Sulignano²,

Greenlees³

et al. 2018

Phys. Rev. C

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The ground-state rotational band of the neutron-deficient californium (Z = 98) isotope 244 Cf was identified for the first time and measured up to a tentative spin and parity of I π = 20 + . The observation of the rotational band indicates that the nucleus is deformed. The kinematic and dynamic moments of inertia were deduced from the measured γ-ray transition energies. The behaviour of the dynamic moment of inertia revealed an up-bend due to a possible alignment of coupled nucleons in high-j orbitals starting at a rotational frequency of abouthω = 0.20 MeV. The results were compared to the systematic behaviour of the even-even N = 146 isotones as well as to available theoretical calculations that have been performed for nuclei in the region.

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Section: Resultsmentioning

confidence: 92%

In-beam spectroscopic study of Cf244

Konki¹,

Sulignano²,

Greenlees³

et al. 2018

Phys. Rev. C

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“…(4) and (5). However, NDS2008 [13] [12]. Combining their data with 240 Np m decay results from the same laboratory [10], they "classified 240 Pu levels as members of various rotational bands."…”

Section: Summary Of Experimental Resultsmentioning

confidence: 99%

“…Combining their data with 240 Np m decay results from the same laboratory [10], they "classified 240 Pu levels as members of various rotational bands." The assignments from these two BNL studies [10,12] have been essentially adopted in the latest Nuclear Data Sheets [13].…”

Section: Summary Of Experimental Resultsmentioning

confidence: 99%

“…Although there is no conflict regarding the suggested 2qp configuration for this isomer, the same has been deduced primarily on consideration of only one β branch and hence listed as "probable" in the latest Nuclear Data Sheets (NDS2008) [13]. In the present study, we take an inclusive approach by simultaneously evaluating 2qp level energies using a well tested formulation for odd-odd deformed nuclei, and seeking a fit to multiple β branches from both the decay chains with a view to arrive at a credible characterization of both the isomers and other proposed levels of 240 Np.…”

Section: Introductionmentioning

confidence: 97%

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Level structures inNp240

2014

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Whereas the 7.2 min 240 Np, first identified over 60 years ago, has been assigned conflicting configuration by various investigators, the 62 min 240 Np is assigned a "probable" configuration, deduced in each case by primarily focusing on just a single β-connected pair of levels in either 240 Np (β − ) 240 Pu or 240 U (β − ) 240 Np decay. We evaluate the level energies of physically admissible 2qp configurations in 240 93 Np 147 employing a three-step procedure, with experimental inputs at each step, and using a well tested two-particle rotor model with inclusion of residual n-p interaction and other contributions. This exercise clearly establishes that the 62 min 240 Np and the 7.2 min 240 Np isomers constitute a Gallagher-Moszkowski (GM) doublet corresponding to the two-quasiparticle (2qp) configuration 5 + {p5/2 + [642] ± n5/2 + [622]}0 + with J π K = 1 + 0 for the higher-lying 7.2 min isomer. This assignment is conclusively confirmed in a level-by-level analysis of data on 23 β transitions in these decays.Structures of a few other 240 Np levels populated in 240 U β decay are also discussed.

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“…Indeed, the relatively short 30.08 year half-life (Browne and Tuli, 2007) has already reduced the total 137 Cs fallout to around 30% of the originally deposited inventory. In contrast, only 0.2% of the plutonium atoms have decayed, owing to the much longer half-lives of 239 Pu (24,110 years) (Browne, 2003) and 240 Pu (6561 years) (Singh and Browne, 2008).…”

Section: Introductionmentioning

confidence: 99%