Nuclear Data Sheets for A = 240

Chukreev, F.E.; Singh, Balraj

doi:10.1016/j.nds.2004.11.004

Cited by 17 publications

(8 citation statements)

References 155 publications

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“…The 240 Pu vibrational inelastic levels [8] include a mass asymmetry vibration with MeV; J π = 6 − , E * = 1.387 and 1.477 MeV were added to ensure the consistency with the combinatorial level density used above this individual state sequence. For an odd-n mass target nucleus such as 239 Pu , the inelastic spectrum also includes low energy single-particle neutron states [9].…”

Section: Individual Compound Nucleus and Transition Statesmentioning

confidence: 99%

Recent Advances in Modeling Fission Cross Sections over Intermediate Structures

Bouland

Lynn

Talou

2010

EPJ Web of Conferences

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Abstract. More accurate fission cross section calculations in presence of underlying intermediate structure are strongly desired. This paper recalls the common approximations used below the fission threshold and quantifies their impact. In particular, an exact expanded R-matrix Monte Carlo calculation of the intermediate structure, deeply mixed with the fluctuations of the class-I and II decay amplitudes, is shown. This paper also insists on the microscopic structure of the level densities as a function of the nucleus deformation and show preliminary neutron induced fission cross section calculations for 239 Pu and 240 Pu using newly calculated combinatorial level densities. Comparisons with recent evaluated and measured fission cross sections are made.

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Section: Individual Compound Nucleus and Transition Statesmentioning

confidence: 99%

Recent Advances in Modeling Fission Cross Sections over Intermediate Structures

Bouland

Lynn

Talou

2010

EPJ Web of Conferences

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“…We have also calculated the values of R 4/2 .The values obtained using the experimental data (taken from [11] in the presented elaboration) are written in Table 5, column 3. The corresponding values obtained using the experimental data contained in [39,[41][42][43][44] are written in Table 5, column 6. The results taken from the paper [38] are collected in Table 5, column 4.…”

Section: Appendixmentioning

confidence: 99%

Dynamic rotational characteristics of actinides on empirical approach

Kaczmarczyk¹,

Korejwo²

2008

Open Physics

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Abstract:In the paper calculation of the moments of inertia for nuclei from the region 87 ≤ Z ≤ 100 and 130 ≤ N ≤ 156 was made in dependence on the angular momentum of their rotational states. The experimental values of the moments of inertia were calculated for rotational energy of the classic rotor in its quantum form, with the use of a simple formula. The moment of inertia term appearing in the formula was treated as a variable. The calculations were carried out on the basis of experimental data for the energies of the rotational levels for 51 bands built on ground states for even-even nuclei and for nuclei with odd mass number A. In addition, 30 rotational bands built on excited states were also analysed in the investigated region in case of eveneven nuclei. For many bands and nuclei the considered dependence of the moment of inertia on angular momentum has been found in the analytical form by fitting polynomials to the experimental data. It turned out that obtained results for the moments of inertia made it possible to describe the energies of rotational levels with a relative deviation not greater or only slightly greater than 1%. In general, in the case of 12 bands of ground level the maximum relative deviation of obtained level energies is smaller than 1‰. PACS

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“…However, it can yield only limited, and none-too-precise, specific information on the characteristics of individual levels of the daughter nuclei. As such, β-γ spectroscopic data serve as the primary basis for structure studies of nuclei in the actinide region [2][3][4][5][6][7]. One of the well-defined quantities in this context is the set of log ft values determined for the various beta transitions.…”

Section: Introductionmentioning

confidence: 99%

“…In this exercise, we seek an answer to the perplexing question as to why the normally classified 'allowed' transitions are found to be actually 'quite forbidden'. Our data set includes the log ft values for actinides as listed in the latest Nuclear Data Sheets [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Intrinsically forbidden ‘allowed’ beta transitions in actinides

Sastri

Jain

Sood

2006

J. Phys. G: Nucl. Part. Phys.

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Intrinsic structures of nuclear levels, connected by highly hindered ‘allowed’ beta transitions in heavy nuclei, are examined to seek the physical basis of this unusual hindrance. A detailed analysis of the inter-relationships of relevant Nilsson wavefunctions reveals that the model-independent shape-dependent quantum number Ω plays a decisive role in this context. An operative selection rule is suggested specifying that beta transitions involving ΔΩ ⩾ 2 are ‘intrinsically forbidden’, even though they may have been classified as ‘allowed’ by the usual spin-parity selection rules. Over 20 instances of such intrinsically forbidden ‘allowed’ transitions from the mass region A = 228–254 are presented to illustrate the applicability of this rule.

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Nuclear Data Sheets for A = 240

Cited by 17 publications

References 155 publications

Recent Advances in Modeling Fission Cross Sections over Intermediate Structures

Recent Advances in Modeling Fission Cross Sections over Intermediate Structures

Dynamic rotational characteristics of actinides on empirical approach

Intrinsically forbidden ‘allowed’ beta transitions in actinides

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