Neutron-rich In and Cd isotopes close to the doubly magic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Sn</mml:mi><mml:mprescripts /><mml:none /><mml:mn>132</mml:mn></mml:mmultiscripts></mml:math>

Scherillo, A.; Genevey, J.; Pinston, J.A.; Covello, A.; Faust, H.; Gargano, A.; Orlandi, R.; Simpson, G. S.; Tsekhanovich, I.; Warr, N.

doi:10.1103/physrevc.70.054318

Cited by 78 publications

(57 citation statements)

References 17 publications

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“…[5], besides the 451-1669 keV cascade, two γ -ray sequences with energies of 950-1171 keV and 1732-389 keV, defining intermediate states at excitation energies of 1171 and 389 keV, respectively, as well as a ground state transition have been assigned to depopulate the 1 + state at 2120 keV. Note that the 389 keV γ ray has also been observed in in-flight fission studies [16,17] and assigned as an M2 transition from a 389 keV state with spin 3…”

Section: Methodsmentioning

confidence: 86%

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βdecay of semi-magicCd130: Revision and extension of the level scheme ofIn130

Jungclaus¹,

Grawe²,

Nishimura³

et al. 2016

Phys. Rev. C

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The β decay of the semi-magic nucleus 130 Cd has been studied at the RIBF facility at the RIKEN Nishina Center. The high statistics of the present experiment allowed for a revision of the established level scheme of 130 In and the observation of additional β feeding to high-lying core-excited states in 130 In. The experimental results are compared to shell-model calculations employing a model space consisting of the full major N = 50-82 neutron and Z = 28-50 proton shells and the NA-14 interaction, and good agreement is found.

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Section: Methodsmentioning

confidence: 86%

“…The half-life of the 3 + state was determined as T 1/2 = 3.1(3) μs [17] and T 1/2 = 1-10 μs [16], respectively. All the transitions mentioned above are also observed in the present work.…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

βdecay of semi-magicCd130: Revision and extension of the level scheme ofIn130

Jungclaus¹,

Grawe²,

Nishimura³

et al. 2016

Phys. Rev. C

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“…More than 40 years ago, levels in the twovalence-proton nucleus 134 Te [15,16] were first identified this way. The advent of large-volume Ge detectors and improved beam intensities allowed nuclei with orders-ofmagnitude weaker fission yields to be studied at the ILL [17] and at GSI [18]. The recent commissioning of the SRC cyclotron and BigRIPS spectrometer at RIBF, RIKEN, combined with the installation of the EURICA (Euroball-RIKEN Cluster Array) Ge γ-ray detector array, gives a unique opportunity to push the boundaries of spectroscopic studies to even more neutron-rich systems.…”

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confidence: 99%

Yrast 6+Seniority Isomers of136,138Sn

Simpson¹,

Gey²,

Jungclaus³

et al. 2014

Phys. Rev. Lett.

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Delayed γ-ray cascades, originating from the decay of ð6 þ Þ isomeric states, in the very neutron-rich, semimagic isotopes 136;138 Sn have been observed following the projectile fission of a 238 U beam at RIBF, RIKEN. The wave functions of these isomeric states are proposed to be predominantly a fully aligned pair of f 7=2 neutrons. Shell-model calculations, performed using a realistic effective interaction, reproduce well the energies of the excited states of these nuclei and the measured transition rates, with the exception of the BðE2; 6 þ → 4 þ Þ rate of 136 Sn, which deviates from a simple seniority scheme. Empirically reducing the νf 2 7=2 orbit matrix elements produces a 4 þ 1 state with almost equal seniority 2 and 4 components, correctly reproducing the experimental BðE2; 6 þ → 4 þ Þ rate of 136 Sn. These data provide a key benchmark for shell-model interactions far from stability.

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“…Beyond-mean-field calculations [8] attribute the anomalous behavior of the E(2 + ) in the Cd chain to the presence of quadrupole collectivity close to the N = 82 shell gap as suggested in Refs. [5,9,10]. To shed light on the structural aspects of the nucleus discussed above, a study of high-spin isomers and their decay has been performed.…”

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confidence: 99%

Spherical proton-neutron structure of isomeric states inCd128

et al. 2009

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The γ -ray decay of isomeric states in the even-even nucleus 128 Cd has been observed. The nucleus of interest was produced both by the fragmentation of 136 Xe and the fission of 238 U primary beams. The level scheme was unambiguously constructed based on γ γ coincidence relations in conjunction with detailed lifetime analysis employed for the first time on this nucleus. Large-scale shell-model calculations, without consideration of excitations across the N = 82 shell closure, were performed and provide a consistent description of the experimental level scheme. The structure of the isomeric states and their decays exhibit coexistence of proton, neutron, and strongly mixed configurations due to πν interaction in overlapping orbitals for both proton and neutron holes. for their implication for r-process nucleosynthesis. HartreeFock-Bogoliubov (HFB) calculations with the Skyrme force predict a reduction of the size of the N = 82 neutron shell gap when approaching Z = 40 [1]. This effect has been attributed to a reduction of the spin-orbit coupling strength caused by the strong interaction between bound orbitals and low-j continuum states. This is due to a large diffuseness of the outer neutron distribution and its influence on the central potential in exotic nuclei with large neutron excess. Dillmann et al. [2] pointed out that the experimental Q β value of 130 Cd, only two proton-holes below 132 Sn, was better reproduced by those mass models that included "shell quenching" at N = 82 [3,4]. Moreover, the flattening of the Cd yrast 2 + systematics from 126 Cd to 128 Cd, two-proton holes and four-and two-neutron holes with respect to 132 Sn, respectively, and the indication of a low lying 2 + state in 130 Cd [5] have been interpreted as indirect evidence of the reduction of the N = 82 neutron shell gap

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Neutron-rich In and Cd isotopes close to the doubly magicSn132

Abstract: Microsecond isomers in the In and Cd isotopes, in the mass range A = 123 to 130, were investigated at the ILL reactor, Grenoble, using the LOHENGRIN mass spectrometer, through thermal-

Cited by 78 publications

References 17 publications

βdecay of semi-magicCd130: Revision and extension of the level scheme ofIn130

βdecay of semi-magicCd130: Revision and extension of the level scheme ofIn130

Yrast 6+Seniority Isomers of136,138Sn

Spherical proton-neutron structure of isomeric states inCd128

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