Experimental indication of the onset of nuclear deformation in neutron-rich Sr isotopes at mass 98

Wöllnik, H.; Wohn, F. K.; Wünsch, K. D.; Jung, G.

doi:10.1016/0375-9474(77)90325-6

Cited by 50 publications

(19 citation statements)

References 11 publications

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“…This calculated value is in complete agreement with the value deduced from our measurement of Qs [7]. Other confirmations have also been obtained, either theoretically from the Nilsson model with reproduces I, ~, and Q for/3 = 0.36 [33], or experimentally from the E2+ measurements performed on the e-e isotones 98Sr [34] and l~176 [35] (N = 60, 62).…”

Section: M M2 = V2/vlsupporting

confidence: 88%

Laser spectroscopy and mass measurements on alkali isotopes

Thibault¹

1985

Hyperfine Interact

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Isotope shifts, spins, hyperfine structures and masses have been measured for the series of the alkali isotopes including the nuclei far from stability. The method of laser spectroscopy and its combinations with rf excitation are described. Some results are discussed, namely the first observation of the red doublet D~-D2 of francium, and the study of shell effects and changes of shape with mass and 6 (r 2 ) measurements for Rb and Na isotopes. IntroductionThe aim of the experiments which are described here was to study the groundstate properties of the nucleus as a function of the neutron number. Up to now, these experiments were conducted on the series of alkali isotopes since they are particularly suitable for laser spectroscopy as well as for mass measurements. As shown in fig. 1, we have studied the shell effects (N = 20, 28, 50, 82, 126), the odd-even staggerings, the shape isomerisms and the occurrence of deformations. We have tried to measure as many properties as possible concerning the same nuclei in order to obtain cross information.On one hand, we measured the spin I, the magnetic moment ~, the spectroscopic electric quadrupole moment Qs, and the variation of the mean square charge radius 6 (r 2 ) by on-line laser spectroscopy eventually combined with a radio frequency excitation, and on the other, we measured the masses M by on-line mass spectrometry.The nuclei far from stability have been produced using three different kinds of nuclear reactions: the spallation, the fission and the fragmentation by high-energy protons (see fig. 1). These experiments were performed either at ISOLDE, which is a mass separator on line with the S.C. (600 MeV protons) at CERN, or directly on line with the P.S.

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Section: M M2 = V2/vlsupporting

confidence: 88%

Laser spectroscopy and mass measurements on alkali isotopes

Thibault¹

1985

Hyperfine Interact

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“…i The energies of the levels up to 1595.3 keV can be well reproduced with the formula for a rotating nucleus The experimentally determined inertia parameters show a small staggering (Fig. 2) Hence, the present studies yield in 99y a band with rotational features (Only the levels at 125.1 and 283.8 keV in 99y have been observed in the study of the B-decay of 99Sr [11]). This band is the most extended one for a nucleus with odd mass in the new region of deformations around A=IO0.…”

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confidence: 67%

Evidence for a rotational band in99Y

et al. 1982

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The nucleus ~Y6~ lies at a transition between spherical and deformed nuclear shapes. Several of its neighbours are known to show rotational properties: The even-even nuclei 98Sr60 and 100Zr~0 seem to be deformed in their ground state [1][2][3] with the coexistence of spherical shapes at small excitation energies [4,5]. In the odd-odd isotope 98y a rotation-like band exists based on an excited state [6 I. Now a search for rotational bands in 99y has been performed. Such bands in an odd proton nucleus would enable the identification of the particular Nilsson orbitals underlying the deformed structure.

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“…The computer program allowed for several exponential components as well as a linear background. In all cases the best 2 Zreduced resulted from fits of one component and a constant background. This may be surprising, because daughter and grand-daughter activity from beta and neutron decays as well as cross contamination could obscure the decay profile.…”

Section: Discussionmentioning

confidence: 95%

“…Significant improvements in selectivity and delay-time characteristics have been achieved for alkaline isotopes by using surface ionization sources. By applying these techniques, very neutron-rich isotopes of rubidium are being studied at CERN [1], Grenoble [2], Washington [3], and Mainz [4]. The present paper comprises a report on half-lives, delayed-neutron emission probabilities P,, and fission yields of the heaviest rubidium isotopes, obtained with this technique at the TRIGA reactor at Mainz.…”

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confidence: 99%

Half-lives, neutron emission probabilities and fission yields of neutron-rich rubidium isotopes in the mass regionA=96 toA=100

et al. 1979

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Neutron-rich rubidium isotopes were produced by thermal-neutron induced fission of 235U and were isolated by surface ionization and mass separation. The new isotope (51 _+ 17)ms a~176 was identified. The half-lives of the rubidium isotopes with mass number A =96 to A = 100 were measured using neutron multiscaling or gamma multispectrum analysis. Measurements of the delayed-neutron emission probability P, of 99Rb and of the fission yields of 97Rb, 98Rb, and 99Rb were performed.

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Experimental indication of the onset of nuclear deformation in neutron-rich Sr isotopes at mass 98

Cited by 50 publications

References 11 publications

Laser spectroscopy and mass measurements on alkali isotopes

Laser spectroscopy and mass measurements on alkali isotopes

Evidence for a rotational band in99Y

Half-lives, neutron emission probabilities and fission yields of neutron-rich rubidium isotopes in the mass regionA=96 toA=100

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