Commentary on McCaul <i>et al</i>. (2010): Observational studies about average alcohol consumption and health ‐ closing time for a limited evidence base

Naimi, Timothy S.

doi:10.1111/j.1360-0443.2010.03029.x

Cited by 10 publications

(17 citation statements)

References 20 publications

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“…Kr, determined in this Letter, both systematics imply a smooth onset of deformation at N ¼ 60, which is consistent with the conclusions from recent mass measurements [11] and results obtained in isotopic shift hr 2 c i measurements [20]. The latter was discussed theoretically in Ref.…”

Section: H Y S I C a L R E V I E W L E T T E R Ssupporting

confidence: 80%

“…0 þ 1 transitions in 94 Kr and 96 Kr are determined using the computer code GOSIA2 [17]. The spectroscopic results imply a smooth onset of deformation in the neutron-rich krypton isotopes around N ¼ 60, which is in agreement with the results obtained in mass measurements [11]. This interpretation is strongly supported by our new calculations with the IBM-2 Hamiltonian determined based on the microscopic Gogny-D1M EDF.…”

Section: H Y S I C a L R E V I E W L E T T E R Ssupporting

confidence: 79%

“…The sudden drop of the Eð2 þ 1 Þ value when going from 94 Kr to 96 Kr implies a rapid change of the ground-state deformation comparable to those in the strontium and the zirconium chains at N ¼ 60. On the other hand, the recently published results from mass measurements [11] suggest that the two-neutron separation energies proceed smoothly towards N ¼ 60, implying a smooth onset of deformation at this neutron number.…”

Section: H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 86%

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Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes

Albers¹,

Warr²,

Nomura³

et al. 2012

Phys. Rev. Lett.

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The neutron-rich nuclei 94;96 Kr were studied via projectile Coulomb excitation at the REX-ISOLDE facility at CERN. Level energies of the first excited 2 þ states and their absolute E2 transition strengths to the ground state are determined and discussed in the context of the Eð2 þ 1 Þ and BðE2; 2 þ 1 ! 0 þ 1 Þ systematics of the krypton chain. Contrary to previously published results no sudden onset of deformation is observed. This experimental result is supported by a new proton-neutron interacting boson model calculation based on the constrained Hartree-Fock-Bogoliubov approach using the microscopic Gogny-D1M energy density functional. DOI: 10.1103/PhysRevLett.108.062701 PACS numbers: 25.70.De, 27.60.+j, 29.30.Kv, 29.38.Gj Since the availability of high-intensity radioactive ion beams, the extension of the concept of quantum phase transitions to exotic nuclei is of great interest in nuclear physics [1]. Quantum phase transitions occur in atomic nuclei as a function of the number of protons or neutrons and describe changes of the ground-state shapes [2]. The so-called A % 100 mass region of the nuclear chart around 100 Zr is one of the most popular regions for the study of this phenomenon since the zirconium (Z ¼ 40) and strontium (Z ¼ 38) isotopes undergo a shape transition from almost spherical to strongly deformed shapes when going from neutron number N ¼ 58 to N ¼ 60 [3][4][5][6][7]. This

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Section: H Y S I C a L R E V I E W L E T T E R Ssupporting

confidence: 80%

Section: H Y S I C a L R E V I E W L E T T E R Ssupporting

confidence: 79%

Section: H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 86%

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Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes

Albers¹,

Warr²,

Nomura³

et al. 2012

Phys. Rev. Lett.

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“…Recent experimental studies of these isotopes have confirmed the competition of low-lying spherical and deformed configurations in 96,98 Sr [7] and established shape coexistence in 94,96 Zr [8,9]. Conversely, for the neutron-rich Kr isotopes, although evidence for a gradual increase of collectivity has been found up to N = 60 [10][11][12], yielding no sudden change from spherical to strong deformation shapes, a possible prolate-oblate shape coexistence has been proposed for 96 Kr and heavier isotopes [5,12]. Experimental data and theoretical studies for the neutronrich Se isotopes are scarce.…”

mentioning

confidence: 99%

Low-lying structure and shape evolution in neutron-rich Se isotopes

Chen¹,

Doornenbal²,

Obertelli

et al. 2017

Phys. Rev. C

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Neutron-rich 88,90,92,94 Se isotopes were studied via in-beam γ -ray spectroscopy after nucleon removal reactions at intermediate energies at the Radioactive Isotope Beam Factory. Based on γ -γ coincidence analysis, low-lying excitation level schemes are proposed for these nuclei, including the 2 + 1 , 4 + 1 states and 2 + 2 states at remarkably low energies. The low-lying 2 + 2 states, along with other features, indicate triaxiality in these nuclei. The experimental results are in good overall agreement with self-consistent beyond-mean-field calculations based on the Gogny D1S interaction, which suggests both triaxial degree of freedom and shape coexistence playing important roles in the description of intrinsic deformations in neutron-rich Se isotopes.

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“…This onset of stability has been interpreted as a consequence of a dramatic increase of the ground-state deformation. The low-Z border of this phenomenon has been recently established by means of mass measurements in the Kr isotopic chain, where no deviation from the standard trend toward the drip line was observed at N = 60 [3]. The systematics of the excitation energy for the first 2 + states in the Sr and Zr isotopic chains also show a sudden drop at N = 60, and by applying a simple geometrical model one can relate it to a change of deformation from β 2 = 0.1 to β 2 = 0.4.…”

Section: Introductionmentioning

confidence: 99%

Low-energy Coulomb excitation of Sr96,98 beams

Clément¹,

Zielińska²,

Péru³

et al. 2016

Phys. Rev. C

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The structure of neutron-rich 96,98 Sr nuclei was investigated by low-energy safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility, CERN, with the MINIBALL spectrometer. A rich set of transitional and diagonal E2 matrix elements, including those for non-yrast structures, has been extracted from the differential Coulomb-excitation cross sections. The results support the scenario of a shape transition at N = 60, giving rise to the coexistence of a highly deformed prolate and a spherical configuration in 98 Sr, and are compared to predictions from several theoretical calculations. The experimental data suggest a significant contribution of the triaxal degree of freedom in the ground state of both isotopes. In addition, experimental information on low-lying states in 98 Rb has been obtained.

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Commentary on McCaul et al. (2010): Observational studies about average alcohol consumption and health ‐ closing time for a limited evidence base

Cited by 10 publications

References 20 publications

Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes

Evidence for a Smooth Onset of Deformation in the Neutron-Rich Kr Isotopes

Low-lying structure and shape evolution in neutron-rich Se isotopes

Low-energy Coulomb excitation of Sr96,98 beams

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