New short-lived isotope 223Np and the absence of the Z = 92 subshell closure near N = 126

Sun, Mingze; Liu, Z.; Huang, T. H.; Zhang, W.Q.; Wang, J. G.; Liu, X. Y.; Ding, Bing; Gan, Z. G.; Ma, Long; Yang, H. B.; Zhang, Z. Y.; Yu, Lingfei; Jiang, Jian; Wang, K. L.; Wang, Y. S.; Liu, M. L.; Li, Z. H.; Li, J.; Wang, X.; Lu, Haiyan; Lin, C. J.; Sun, L. J.; R., N.; Yuan, Cenxi; Zuo, Wei; Xu, H. S.; Zhou, X. H.; Xiao, Guoqing; Qi, Chong; Zhang, F. S.

doi:10.1016/j.physletb.2017.03.074

Cited by 59 publications

(22 citation statements)

References 34 publications

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“…Two examples can be seen in the figure and demonstrate our sensitivity to microsecond and sub-microsecond activities and the operation of the custom hybrid mode acquisition scheme [34,38]. In the first case, 220 Th with a half-life of 9.7 µs [39] is registered as an implantation in the DSSD, this is followed by an α-α pileup (8.8 MeV and then 9.3 MeV) which then triggers the recording of a trace because, the half-life of this decay is 0.17 ± 0.05 µs [40]. It is also possible that all three pulses (ER-α-α) are recorded in the trace.…”

Section: B the Performance Of The New Fast-detection System And Analmentioning

confidence: 99%

Search for the heaviest atomic nuclei among the products from reactions of mixed-Cf with a Ca48 beam

Brewer¹,

Utyonkov²,

Rykaczewski³

et al. 2018

Phys. Rev. C

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Section: B the Performance Of The New Fast-detection System And Analmentioning

confidence: 99%

Search for the heaviest atomic nuclei among the products from reactions of mixed-Cf with a Ca48 beam

Brewer¹,

Utyonkov²,

Rykaczewski³

et al. 2018

Phys. Rev. C

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“…The Hamiltonian KHPE [23], which is based on Kuo-Herling particle (KHP) interaction [20,21], is constructed in model space including six proton orbits beyond Z = 82 and NO7. Recently, KHPE is used to analyze the spin and parity of newly observed nuclide 223 Np [24] and isomeric state of 218 Pa [25]. The neutron-neutron part of KHPE is used for the neutron-neutron interaction inside NO7 in the present Hamiltonian.…”

Section: Shell-model Hamiltonianmentioning

confidence: 99%

Systematic shell-model study on spectroscopic properties in the south region of $^{208}$Pb

Yuan¹,

Shimizu²,

Podolyák³

et al. 2021

Preprint

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Background: The properties of nuclei located in the south region of 208 Pb are important for understanding the r-process nucleosynthesis. While some isomeric states and their spectroscopic properties have been investigated experimentally in neutron-rich Pb, Tl, and Hg isotopes recently, a large portion of the area still remains unreachable.Purpose: We aim to study the properties of nuclei in the south region of 208 Pb systematically, including the binding and excitation energies and electromagnetic properties, in order to predict unknown properties of these nuclei, such as isomerism, utilizing a theoretical model which describes the experimentally known properties precisely. We also address whether the N = 126 shell closure is robust or not when the proton number decreases from 208 Pb.Methods: We performed large-scale shell-model calculations with a new Hamiltonian suggested in the present work. The model space is taken as the five proton orbits within 50 < Z 82 and the thirteen neutron orbits within 82 < N 184. And one-particle one-hole excitation is allowed across the N = 126 gap. The Hamiltonian is constructed by combining the existing Hamiltonians, KHHE (with minor adjustment of its monopole part) and KHPE, and the monopole based universal interaction.Results: The shell-model results well reproduce the experimentally observed binding energies and spectroscopic properties, such as isomerism, core excitation, and electromagnetic properties. Some possible isomeric states in neutron-rich Pb, Tl, and Hg isotopes are predicted with transition energies and half-lives. The N = 126 shell gap is predicted to be robust from Z = 82 down to 68 with minor reduction. We also examine the effective charges and the quenching of the g factors suitable for this region by systematic comparisons between observed and calculated electromagnetic properties.Conclusions: A new Hamiltonian is constructed for nuclei in the south region of 208 Pb, which provides reasonable descriptions on various nuclear properties through comprehensive and systematic studies. The present Hamiltonian and discussions provide fruitful information for future measurements and theoretical investigations in this region, such as the recommended effective charges and g factors, the predicted binding energies, isomeric states, and core-excited states.

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“…This method has notably been used in the α-decay spectroscopy of nuclei around 100 Sn, with the α-particle energies from the 109 Xe → 105 Te → 101 Sn decay chain being measured with high precision [11][12][13] and the 108 Xe → 104 Te → 100 Sn chain being identified recently for the first time [14]. Digital pulse shapes have also been used to measure the α-particle energies from the highest-mass N = 130 isotones 222 U [15] and 223 Np [16]; however, in these cases, there are significant uncertainties on the measured energies. The inability to identify weaker α-decay branches using catcher-foil methods and the complications arising from energy summing inherent in implantation methods mean that no fine structure has, to date, been observed in any of the eight N = 130 nuclei from 216 Rn (Z = 86) to 223 Np (Z = 93).…”

Section: Introductionmentioning

confidence: 99%

α -decay spectroscopy of the N=130 isotones Ra218 and
Parr¹,
Smith²,
Greenlees³
et al. 2019
Phys. Rev. C

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An analysis technique has been developed in order to mitigate energy summing due to sequential short-lived α decays from nuclei implanted into a silicon detector. Using this technique, α-decay spectroscopy of the N = 130 isotones 218 Ra (Z = 88) and 220 Th (Z = 90) has been performed. The energies of the α particles emitted in the 218 Ra → 214 Rn and 220 Th → 216 Ra ground-state-to-ground-state decays have been measured to be 8381(4) keV and 8818(13) keV, respectively. The half-lives of the ground states of 218 Ra and 220 Th have been measured to be 25.99(10) μs and 10.4(4) μs, respectively. The half-lives of the ground states of the α-decay daughters, 214 Rn and 216 Ra, have been measured to be 259(3) ns and 161(11) ns, respectively. Fine structure in the α decay of 218 Ra has been observed for the first time, populating the 695-keV 2 + 1 state in 214 Rn. The fine-structure α decay has an α-particle energy of 7715(40) keV and branching ratio b α = 0.123(11)%.

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New short-lived isotope 223Np and the absence of the Z = 92 subshell closure near N = 126

Cited by 59 publications

References 34 publications

Search for the heaviest atomic nuclei among the products from reactions of mixed-Cf with a Ca48 beam

Search for the heaviest atomic nuclei among the products from reactions of mixed-Cf with a Ca48 beam

Systematic shell-model study on spectroscopic properties in the south region of $^{208}$Pb

α -decay spectroscopy of the N=130 isotones Ra218 and
Parr¹,
Smith²,
Greenlees³
et al. 2019
Phys. Rev. C

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New short-lived isotope 223Np and the absence of the Z = 92 subshell closure near N = 126

Cited by 59 publications

References 34 publications

Search for the heaviest atomic nuclei among the products from reactions of mixed-Cf with a Ca48 beam

Search for the heaviest atomic nuclei among the products from reactions of mixed-Cf with a Ca48 beam

Systematic shell-model study on spectroscopic properties in the south region of $^{208}$Pb

α -decay spectroscopy of the N=130 isotones Ra218 and Parr1, Smith2, Greenlees3 et al. 2019Phys. Rev. C

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New short-lived isotope 223Np and the absence of the Z = 92 subshell closure near N = 126

α -decay spectroscopy of the N=130 isotones Ra218 and
Parr¹,
Smith²,
Greenlees³
et al. 2019
Phys. Rev. C