Nuclear Data Sheets for A = 246

Browne, E.; Tuli, J.K.

doi:10.1016/j.nds.2011.06.002

Cited by 21 publications

(5 citation statements)

References 165 publications

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“…The measured half-life following EVR implantation was T 1/2 (EVR-α 1 ) = (54 ± 4) s with literature values given as T lit 1/2 = (51.2 ± 0.4) s [7]. The subsequent α 1 -α 2 correlation to 250 Fm daughter nucleus was measured at T 1/2 (α 1 -α 2 ) = (32.5 ± 1.8) m compared with the literature value of T lit 1/2 = 30 m [8]. The improved granularity of the new set-up with using the DSSD compared to the previous decay spectroscopy station at SHIP (which employed a 16-strip SSSD as the implantation detector) allows for longer decay times to be measured with a decreased random background rate.…”

Section: No Productionmentioning

confidence: 53%

Decay Spectroscopy of Heavy Isotopes at SHIP Using the COMPASS Focal Plane Detection Set-up

Mistry¹,

Zhang²,

Heßberger³

et al. 2018

Acta Phys. Pol. B

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The new COMPASS detection system designed and developed at GSI, Darmstadt was employed in the focal plane of the SHIP velocity filter online during a period of commissioning. The isotope 254 No was initially measured for control purposes, following which the nuclei, 227,228,230 U, 229 Np, and 229,230 Pu were synthesized. The obtained data from α-decay spectroscopy is evaluated and compared with previous measurements.

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Section: No Productionmentioning

confidence: 53%

Decay Spectroscopy of Heavy Isotopes at SHIP Using the COMPASS Focal Plane Detection Set-up

Mistry¹,

Zhang²,

Heßberger³

et al. 2018

Acta Phys. Pol. B

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“…Energies of collective excited levels ordered by rotational bands for selected even-even Z =90-98 isotopes. Level energies which are not available in ENSDF evaluated nuclear structure data [22][23][24][25][26][27][28][29][30][31][32][33] were estimated by the SRM and are marked by asterisk*. [34] RIPL [35] Minsk [36] a S0 S0 S0 232 Th 0.71±0.04 0.84±0.07 0.94±0.07 [37] 0.93 1.14 0.80 238 U 1.29±0.13 1.03±0.08 1.03±0.08 [38] 1 a The values for this column are taken from Ref.…”

Section: Discussionmentioning

confidence: 99%

“…The individual nuclear structure is accounted for by the parameters of the corresponding SRM Hamiltonian that properly describes the low-lying collective level scheme (including the multi-band coupling strengths) and, of course, by the individual equilibrium deformation parameters and Fermi energies. The SRM [22] nuclear Hamiltonian parameters have previously been fitted for even-even actinides with Z =90-98 that feature sufficient level data [23][24][25][26][27][28][29][30][31][32][33][34]. Details of the fitting method and a related discussion of the obtained parameters will be published elsewhere.…”

Section: Optical Model Potential With Multiple Band Couplingmentioning

confidence: 99%

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Predicting the optical observables for nucleon scattering on even-even actinides

Martyanov¹,

Soukhovitskiĩ²,

Capote³

et al. 2017

Chinese Phys. C

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Previously derived Lane consistent dispersive coupled-channel optical model for nucleon scattering on 232 Th and 238 U nuclei is extended to describe scattering on even-even actinides with Z =90-98. A soft-rotator-model (SRM) description of the low-lying nuclear structure is used, where SRM Hamiltonian parameters are adjusted to the observed collective levels of the target nucleus. SRM nuclear wave functions (mixed in K quantum number) have been used to calculate coupling matrix elements of the generalized optical model. The "effective" deformations that define inter-band couplings are derived from SRM Hamiltonian parameters. Conservation of nuclear volume is enforced by introducing a dynamic monopolar term to the deformed potential leading to additional couplings between rotational bands. Fitted static deformation parameters are in very good agreement with those derived by Wang and collaborators using the Weizsäcker-Skyrme global mass model (WS4), allowing to use the latter to predict cross section for nuclei without experimental data. A good description of scarce "optical"experimental database is achieved. SRM couplings and volume conservation allow a precise calculation of the compound-nucleus formation cross sections, which is significantly different from the one calculated with rigid-rotor potentials coupling the ground-state rotational band. Derived parameters can be used to describe both neutron and proton induced reactions.

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“…However, the observation of an 893 keV γ ray in coincidence with a cascade of converted transitions reported by David et al [25] might be the signature of the presence of this collective excitation. The 893 keV transition could be a transition connecting the 2 − band head to the first excited state of the ground-state rotational band and therefore correspond to the 799 keV line in 246 Cm [27], the 593 keV line in 248 Cf [22], the 834 keV line in 250 Fm [28], and 883 keV line in 252 No [1]. If the transition is 2 − → 2 + , the excitation energy of the 2 − state would be ∼940 keV, as the 2 + must be ∼45 keV above the ground state.…”

Section: A 2 − State In the N = 150 Isotonesmentioning

confidence: 99%

Influence of octupole vibration on the low-lying structure of Fm251 and other heavy N=151 isotones

et al. 2018

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The structure of low-lying excited states in 251 Fm, populated by the α decay of 255 No, has been investigated by means of combined γ and internal conversion electron spectroscopy. The values for the internal conversion coefficients for the 1/2 + → 5/2 + and 5/2 + → 9/2 − transitions have been measured. The determined M2/E3 mixing ratio and lifetime for the 5/2 + decay to the ground state allowed to determine the corresponding reduced transitions strengths of B(E3) = 18(6) W.u. and B(M2) = 3.0(6) × 10 −3 W.u. These results, as well as the results of previous studies in N = 151 isotopes, are compared to theoretical calculations beyond the mean-field approach, including the first QRPA calculations using the Gogny D1M parametrization for such heavy odd-N nuclei. The comparison points to the importance of accounting for the octupole vibrations for a proper understanding of the low-lying nuclear structure of some of the heaviest elements.

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Nuclear Data Sheets for A = 246

Cited by 21 publications

References 165 publications

Decay Spectroscopy of Heavy Isotopes at SHIP Using the COMPASS Focal Plane Detection Set-up

Decay Spectroscopy of Heavy Isotopes at SHIP Using the COMPASS Focal Plane Detection Set-up

Predicting the optical observables for nucleon scattering on even-even actinides

Influence of octupole vibration on the low-lying structure of Fm251 and other heavy N=151 isotones

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