<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>Isomers in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>No</mml:mi><mml:mprescripts /><mml:none /><mml:mn>254</mml:mn></mml:mmultiscripts></mml:math>: Probing Single-Particle Energies and Pairing Strengths in the Heaviest Nuclei

Tandel, S. K.; Khoo, T. L.; Seweryniak, D.; Mukherjee, G.; Ahmad, I.; Back, B. B.; Blinstrup, R.; Carpenter, M. P.; Chapman, J.; Chowdhury, P.; Davids, C. N.; Hecht, A. A.; Heinz, A.; Ikin, P. J. C.; Janssens, R. V. F.; Kondev, F. G.; Lauritsen, T.; Lister, C. J.; Moore, E. F.; Peterson, D.; Reiter, P.; Tandel, U. S.; Wang, X.; Zhu, S.

doi:10.1103/physrevlett.97.082502

Cited by 111 publications

(67 citation statements)

References 28 publications

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“…The decay of 254 No was recently revisited by Herzberg et al [13] and by Tandel et al [14], where a second isomer was found. In the nucleus 252 No, a new K isomer with a half-life of 110 ± 10 ms at an excitation energy of 1254 keV was discovered at SHIP (GSI, Darmstadt) [15] and confirmed at FMA (Argonne National Laboratory) [16], both experiments using decay spectroscopy techniques.…”

Section: Introductionmentioning

confidence: 97%

Investigation of high-Kstates in252No

Sulignano¹,

Theisen²,

Delaroche³

et al. 2012

Phys. Rev. C

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Section: Introductionmentioning

confidence: 97%

Investigation of high-Kstates in252No

Sulignano¹,

Theisen²,

Delaroche³

et al. 2012

Phys. Rev. C

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“…For example, β 2 ≈ 0.27 has been derived for 254 No from the measured ground-state band [6]. The observation of K isomers with highly hindered decays in 254 No [7][8][9] points to an axially symmetric shape for the nucleus. The deformation can bring the single-particle levels from the next shell across the predicted closure down to the Fermi surface.…”

mentioning

confidence: 98%

Understanding the different rotational behaviors of252No and254No

2012

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Total Routhian surface calculations have been performed to investigate rapidly rotating transfermium nuclei, the heaviest nuclei accessible by detailed spectroscopy experiments. The observed fast alignment in 252 No and slow alignment in 254 No are well reproduced by the calculations incorporating high-order deformations. The different rotational behaviors of 252 No and 254 No can be understood for the first time in terms of β 6 deformation that decreases the energies of the νj 15/2 intruder orbitals below the N = 152 gap. Our investigations reveal the importance of high-order deformation in describing not only the multiquasiparticle states but also the rotational spectra, both providing probes of the single-particle structure concerning the expected doubly magic superheavy nuclei.DOI: 10.1103/PhysRevC.86.011301 PACS number(s): 21.10. Re, 21.60.Cs, 23.20.Lv, 27.90.+b Together with the exploration of nuclei far away from the stability line using radioactive nuclear beams, the synthesis of superheavy nuclei towards the predicted "island of stability" by fusion reactions is the focus of current research on atomic nuclei [1,2]. The occurrence of superheavy nuclei is due to the quantum shell effect (see, e.g., Ref. [3]) that overcomes the strong Coulomb repulsion between the large number of protons. The shell effect peaks at the expected doubly magic nucleus next after 208 Pb, the center of the stability island. Unfortunately, various theories give rise to different magic numbers, and available experiments have not been able to confirm or exclude any of them. Nevertheless, one can obtain single-particle information that is intimately related to the shell structure of superheavy nuclei from transfermium nuclei where γ -ray spectroscopy has been accessible for experiments [4,5].Transfermium nuclei have been found to be deformed. For example, β 2 ≈ 0.27 has been derived for 254 No from the measured ground-state band [6]. The observation of K isomers with highly hindered decays in 254 No [7][8][9] points to an axially symmetric shape for the nucleus. The deformation can bring the single-particle levels from the next shell across the predicted closure down to the Fermi surface. They play an active role in both nuclear noncollective and collective motions that in turn can serve as probes of the single-particle structure. For example, the observed K π = 3 + state formed by broken-pair excitation in 254 No is of special interest [7]. This is because the π 1/2 − [521] orbital occupied by one unpaired nucleon stems from the spherical orbital 2f 5/2 whose position relative to the spin-orbit partner 2f 7/2 determines whether Z = 114 is a magic number for the "island of stability." On the other hand, high-j intruder orbitals sensitively respond to the Coriolis force during collective rotation. The observation of upbending or backbending phenomena is usually associated with the alignment of high-j intruder orbitals. The spectroscopy experiments on transfermium nuclei provide a * hlliu@mail.xjtu.edu.cn testing ground for...

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“…a coupling of the two 8 − configurations built on two protons and two neutrons, respectively, which are expected to lie close in energy. However, in [10], a proposal of 14…”

Section: Systematics Of Isomers Above Z = 82mentioning

confidence: 99%

“…While isomers in this region have been known for many years, e.g., in 250 Fm and 254 No [8], a breakthrough came when detailed spectroscopy of 254 No revealed the presence of two isomers, whose decay path included a twoquasiproton (1/2 − [521] × 7/2 − [514]) 3+ configuration. This showed that the 3f 5/2 orbital which in spherical nuclei would lie above the postulated magic gap at Z = 114 lies close to the Fermi surface in well-deformed nuclei in the nobelium region and is available for study [9,10]. Since then a wealth of experimental information has been gathered on isomers in this region in nuclei reaching up to 270 Ds [11,12].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy of actinide and transactinide nuclei

Herzberg¹,

Cox

2011

Radiochimica Acta

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Actinides / Transactinides / Gamma-ray spectroscopy / Conversion electron spectroscopy / In-beam spectroscopy / Recoil-decay-tagging / Decay spectroscopy / Rotational structure / Nilsson single-particle levels / Isomers / g-factors Summary. The role of isomers for nuclei with Z ≥ 100 is discussed. Recent advances in experimental instrumentation leading to combined in-beam gamma ray and conversion electron spectroscopy are discussed. The rotational spectra of nuclei with Z ≥ 94 and their moments of inertia are discussed. Examples for in-beam spectroscopy leading to the discovery and identification of isomers are given in 248,250 Fm. Here some attention is given to the assignment of nuclear configurations from g-factors measured via the branching ratios of coupled bands built on the isomers. A full list of the longest lived isomers in nuclei with Z ≥ 82 is given.

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KIsomers inNo254: Probing Single-Particle Energies and Pairing Strengths in the Heaviest Nuclei

Cited by 111 publications

References 28 publications

Investigation of high-Kstates in252No

Investigation of high-Kstates in252No

Understanding the different rotational behaviors of252No and254No

Spectroscopy of actinide and transactinide nuclei

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