Nuclear Structure

A precise value for the magnetic moment of the 69 As 5/2 − ground state has been obtained from nuclear magnetic resonance on oriented nuclei (NMR/ON) using the NICOLE 3 He-4 He dilution refrigerator setup at ISOLDE/CERN. The NMR/ON signal was observed by monitoring the anisotropy of the 69 As β particles. The center frequency ν[B ext = 0.0994(10)T ] = 169.98(9) MHz corresponds to µ[ 69 As] = +1.6229(16)µ N . This result differs considerably from the πf 5/2 single-particle value obtained with g factors for a free proton but is in reasonable agreement with the value obtained with effective g factors and with values from a core polarization calculation and from calculations in the framework of the interacting boson-fermion model. Assuming a single exponential spin-lattice relaxation behavior a relaxation time T 1 = 10(25) s was observed for 69 AsFe at a temperature of about 20 mK in a magnetic field B = 0.1 T.

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“…Using then the relation for a strong coupled system consisting of a single particle and a deformed core [23,24] …”

Section: Resultsmentioning

confidence: 99%

Nuclear magnetic moment ofAs69from on-line β-NMR on oriented nuclei

et al. 2005

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“…Intrinsic moment Q 0 values were recalculated [9] from static electric quadrupole moment Q values measured in the laboratory system. It was supposed that near spherical nucleus shape vibrations amplitude is small in comparison to nucleus equilibrium deformation and, therefore, the following equation can be used…”

Section: Quadrupole Deformation Parameter δ From Nucleus Quadrupole Mmentioning

confidence: 99%

Investigation of quadrupole deformation of nucleus and its surface dynamic vibrations

Boboshin

Ишханов

Komarov

et al. 2007

Nd2007

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Abstract.The new complete database -Chart of nuclear quadrupole deformations -was developed using various sources of related information. Using this Chart the system comparative analysis of quadrupole deformation parameters β 2 obtained by two different methods was carried out for many nuclei. The clear systematical disagreements of β 2 parameters obtained from nuclear quadrupole moments Q ("Q-type" data) and from reduced transition probability B(E2) ↑ for 0 + → 2 + 1 transitions ("B-type" data) were revealed. It was found out that all nuclides investigated are clearly separated into two groups. For all isotopes of "group 1" nuclei good agreement was observed for data of both types. For all isotopes of "group 2" nuclei "B-type" β 2 data values are systematically (in many cases significantly) larger than "Q-type" ones. In cases of only few exceptions disagreement for some isotopes are combined with agreements for others. It was shown that two types data difference could be explained in the frame of assumption about the not negligible role of dynamic vibrations of nucleus surface, by other words, about dependence of quadrupole deformation parameter β 2 values on surface vibrations of nucleus in ground state. From this point of view "Q-type" β 2 values do not take into account nucleus surface vibration, but "B-type" β 2 values do that. Therefore "B-type" data reflect not only static nuclear deformation (deviation of nucleus shape from spherical), but dynamic deformation also.

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“…Excited Since the early days of nuclear structure physics, nuclei of triaxial shape have been a subject of high interest. In the 1950s, two elementary models were derived, which include a breaking of the axial symmetry of the Bohr Hamiltonian [1] by introducing the triaxial deformation parameter γ in addition to the ellipsoidal elongation β. The γ parameter ranges from 0 • (prolate shape) to 60 • (oblate shape), and maximum triaxiality occurs at 30 • .…”

mentioning

confidence: 99%

Triaxiality of neutron-rich Ge84,86,88 from low-energy nuclear spectra

Lettmann¹,

Werner²,

Pietralla³

et al. 2017

Phys. Rev. C

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γ -ray transitions between low-spin states of the neutron-rich 84,86,88 Ge were measured by means of in-flight γ -ray spectroscopy at 270 MeV/u. Excited 6 + 1 , 4 + 1,2 , and 2 + 1,2 states of 84,86 Ge and 4 + 1 and 2 + 1,2 states of 88 Ge were observed. Furthermore, a candidate for a 3 + 1 state of 86 Ge was identified. This state plays a key role in the discussion of ground-state triaxiality of 86 Ge, along with other features of its low-energy level scheme. A new region of triaxially deformed nuclei is proposed in the Ge isotopic chain.

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Nuclear Structure

Cited by 199 publications

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Nuclear magnetic moment ofAs69from on-line β-NMR on oriented nuclei

Nuclear magnetic moment ofAs69from on-line β-NMR on oriented nuclei

Investigation of quadrupole deformation of nucleus and its surface dynamic vibrations

Triaxiality of neutron-rich Ge84,86,88 from low-energy nuclear spectra

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