Configurations and hindered decays of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si3117.gif" display="inline" overflow="scroll"><mml:mi>K</mml:mi></mml:math> isomers in deformed nuclei with <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si3118.gif" display="inline" overflow="scroll"><mml:mstyle mathvariant="normal"><mml:mi>A</mml:mi></mml:mstyle><mml:mo>&gt;</mml:mo><mml:mn>100</mml:mn></mml:math>

Kondev, F. G.; Dracoulis, George; Kibédi, T.

doi:10.1016/j.adt.2015.01.001

Cited by 97 publications

(63 citation statements)

References 124 publications

(148 reference statements)

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“…A recent compilation of the decay properties of multiquasiparticle K isomers [2] has provided a description of the systematic behavior of log(F W ) as a function of ∆K. The data for E1 transitions are shown in black in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Less abundant are K-isomers measured in the A ≈ 130, 150 and actinide regions [2,3]. Interestingly, the neutron-rich A ∼ 100 region, where the K quantum number is expected to play a major role as a result of the prevalence of axiallydeformed ground-states, has a scarcity of observed K isomers formed from multi-quasiparticle states, fewer than even the transuranic elements [3,4].…”

Section: Introductionmentioning

confidence: 99%

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K selection in the decay of the (ν52[532]⊗32[411]

Browne¹,

Bruce²,

Sumikama³

et al. 2017

Phys. Rev. C

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

K selection in the decay of the (ν52[532]⊗32[411]

Browne¹,

Bruce²,

Sumikama³

et al. 2017

Phys. Rev. C

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“…Moreover, knowledge on isomers and their de-excitation can illuminate many nuclear phenomena related to nuclear structure, as presented in Refs. [19,28] and references therein, and astrophysics studies. For example, in the astrophysical rapid neutron capture process, fission cycles material back to lower-mass regions [29,30].…”

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confidence: 99%

Isomeric fission yield ratios for odd-mass Cd and In isotopes using the phase-imaging ion-cyclotron-resonance technique

et al. 2019

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Isomeric yield ratios for the odd-A isotopes of 119−127 In from 25-MeV proton-induced fission on natural uranium have been measured at the JYFLTRAP double Penning trap, by employing the Phase-Imaging Ion-Cyclotron-Resonance technique. With the significantly improved mass resolution of this novel method isomeric states separated by 140 keV from the ground state, and with half-lives of the order of 500 ms, could be resolved. This opens the door for obtaining new information on low-lying isomers, of importance for nuclear structure, fission and astrophysics. In the present work the experimental isomeric yield ratios are used for the estimation of the root-mean-square angular momentum (J rms ) of the primary fragments. The results show a dependency on the number of unpaired protons and neutrons, where the odd-Z In isotopes carry larger angular momenta. The deduced values of J rms display a linear relationship when compared with the electric quadrupole moments of the fission products.

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“…Investigations of K-isomers have been reviewed recently in Refs. [14][15][16][17][18].An impressive progress has been achieved in experimental studies of samarium and gadolinium isotopes very recently [4,5,8,9,11,12]. The most exiting discoveries include: 160 Sm became the lightest nucleus with a known four-quasiparticle K-isomer [8], K-isomers were firstly observed in very neutron-rich nuclei 164 Sm and 166 Gd [11] and in odd-A samarium isotopes [4,5].…”

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confidence: 99%

Insight into nuclear midshell structures by studying K isomers in rare-earth neutron-rich nuclei

He¹,

Li²

2018

Phys. Rev. C

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Inspired by the newly discovered isomeric states in the rare-earth neutron-rich nuclei, high-K isomeric states in neutron-rich samarium and gadolinium isotopes are investigated within the framework of the cranked shell model (CSM) with pairing correlation treated by a particle-numberconserving (PNC) method. The experimental multi-particle state energies and moments of inertia are reproduced quite well by the PNC-CSM calculations. A remarkable effect from the high-order deformation ε6 is demonstrated. Based on the occupation probabilities, the configurations are assigned to the observed high-K isomeric states. The lower 5 − isomeric state in 158 Sm is preferred as the two-proton state with configuration π 5 2 + [413]⊗π 5 2 − [532]. More low-lying two-particle states are predicted. The systematics of the electronic quadrupole transition probabilities, B(E2) values along the neodymium, samarium, gadolinium and dysprosium isotopes and N = 96, 98, 100, 102 isotones chains is investigated to reveal the midshell collectivities. * hext@nuaa.edu.cn arXiv:1808.03945v1 [nucl-th] 12 Aug 2018The rare-earth neutron-rich nuclei lie in the midshell region between the closed shells of proton Z = 50, 82 and neutron N = 82, 126. The high spin spectroscopy of these nuclei can provide important insights into the midshell collectivity, changes in nuclear shape and deformed sub-shells in a less-explored single-particle spectrum region. Furthermore, the pygmy rare-earth peak at A ∼ 160 of the r−process abundance is believed to arise from strong midshell nuclear deformation [1,2]. The nuclear structure inputs of the rare-earth nuclei can lead to an improved understanding of the r−process nucleosynthesis [3]. However, due to their neutron excess, detailed structure informations are very difficult to be revealed by the experiment in these rare-earth neutron-rich nuclei.The recent experimental progresses in the neutron-rich A = 150 − 170 region [4][5][6][7][8][9][10][11][12][13] are attributed to a great extent to the existence of the nuclear isomeric state. A nucleus can be "traped" in an aligned spin orientation relative to its symmetric axis to form the K isomeric state (or K-isomer), where K is a quantum number representing the projection of the total nuclear spin along the symmetry axis of the nucleus. K-isomer arises from the multi-particle state, of which the transition to a lower energy state with a different K value is inhibited by the ∆K ≤ λ selection rule where λ is the multipole order of the transition. However, symmetry-breaking processes make these transitions possible to process with the ∆K − λ related hindrance factor [14,15]. The multi-particle state is formed by breaking pairs of nucleon. The excitation energy and configuration of multi-particle state depend strongly on the position of the specific single-particle orbitals near the Fermi surface and correlations, such as pairing. K-isomer appears only in axially symmetric deformed nuclei well away from the closed shell. This implies that K-isomer cannot be a pure intrinsi...

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Configurations and hindered decays of K isomers in deformed nuclei with A>100

Cited by 97 publications

References 124 publications

K selection in the decay of the (ν52[532]⊗32[411]

K selection in the decay of the (ν52[532]⊗32[411]

Isomeric fission yield ratios for odd-mass Cd and In isotopes using the phase-imaging ion-cyclotron-resonance technique

Insight into nuclear midshell structures by studying K isomers in rare-earth neutron-rich nuclei

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