Nuclear deformation of holmium isotopes

Alkhazov, G.; Barzakh, A. E.; Chubukov, I. Ya.; Denisov, V. I.; Ivanov, V.; Buyanov, N. B.; Fedoseyev, V. N.; Letokhov, V. S.; Mishin, V. I.; Sekatsky, S. K.

doi:10.1016/0375-9474(89)90557-5

Cited by 51 publications

(21 citation statements)

References 22 publications

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“…The change of shape of nuclei and other properties of nuclear structure with neutron number has attracted much theoretical and experimental attention for many years [8,9,10,11,12]. The conditions needed for the observation of shapes coexisting in such nuclei have been a matter of challenge and theoretically calculated by Patra and Panda [13] in 1993.…”

Section: Introductionmentioning

confidence: 99%

Nuclear structure and decay properties of even–even nuclei in Z = 70−80 drip-line region

Mahapatro

Lahiri

Kumar

et al. 2016

Int. J. Mod. Phys. E

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We study nuclear structure properties for various isotopes of Ytterbium (Yb), Hafnium(Hf), Tungsten(W), Osmium(Os), Platinum(Pt) and Mercury(Hg) in Z = 70 − 80 drip-line region starting from N = 80 to N = 170 within the formalism of relativistic mean field (RMF) theory. The pairing correlation is taken care by using BCS approach. We compared our results with Finite Range Droplet Model(FRDM) and experimental data and found that the calculated results are in good agreement. Neutron shell closure are obtained at N = 82 and 126 in this region. We have also studied probable decay mechanisms of these elements.

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Section: Introductionmentioning

confidence: 99%

Nuclear structure and decay properties of even–even nuclei in Z = 70−80 drip-line region

Mahapatro

Lahiri

Kumar

et al. 2016

Int. J. Mod. Phys. E

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“…Their ~A values are close to those for strong deformed rare-earth nuclides (e.g., for Tm isotopes with the neutron numbers N=93 and 95, ~Ta is equal to 0.74 (11) and 0.83 (13) respectively [11]). Thus, for the europium isotopes with N > 92 the normal OES is restored.…”

Section: Ya=2a (R2)a_ Ia/a (R2)a_ Ia+ Imentioning

confidence: 78%

Odd-even staggering in nuclear charge radii of neutron-rich europium isotopes

Alkhazov

Barzakh

Bol’shakov

et al. 1990

Z. Physik A - Atomic Nuclei

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Nuclear magnetic dipole and electric quadrupole moments and changes in mean square charge radii for the neutron-rich 155-159Eu isotopes have been measured using resonance ionization spectroscopy at the IRIS facility. It has been found that the isotopes with N > 92, unlike the isotopes with 89 < N < 92, have an ordinary character of odd-even staggering in nuclear charge radii. This means that the octupole deformation attributed previously to the europium nuclei around 154Eu does not display itself in the charge radii of heavier europium isotopes.PACS: 21.10.Ft, Ky; 31.30.GsThe odd-even staggering (OES) of nuclear-charge radii is a very remarkable effect. It consists in the fact that the mean square charge radius (r z) of an odd-N nucleus is always (with a few exceptions) smaller than the average value of the radii for its even-N neighbours (the normal OES).The staggering effect is expressed by the parameterwhere A (r2)a_l,A = (r2)A -(rZ)A _ ~ with A being the atomic number of an odd-N nucleus. For the normal OES, 7,~ < 1. The OES is understood qualitatively as an effect of pairing giving rise to an enlarged zero-point vibration amplitude in even-N nuclei [1]. It has been shown also [-2] that three-and four-body correlations may be essential in forming the normal staggering. However, there are a few instances with YA > 1 (the inverted OES). Many of them are considered to be due to a shape instability, when a sudden onset of nuclear quadrupole deformation occurs as, for example, in the cases of the neutron deficient 7] isotopes the inverted OES is likely to be connected with the octupole degree of freedom. The invertion takes place exactly in those nuclei for which reflection-asymmetric shapes were theoretically predicted and suggested also by some nuclear spectroscopic evidence. It was found also [6], that the normal staggering is restored towards the isotopes which are supposed to be reflection-symmetric. A marked inverted OES was observed also in the vicinity of 154Eu in the course of isotope shift (IS) investigations at the IRIS facility [8]. The conception of quadrupole deformation instability can not be used to interpret the found inversion because all the nuclei involved (153,154,155Eu ) have stable and strong quadrupole deformation, as it is well known from the quadrupole moments [8] and rotational bands for these nuclei [9]. Recently, as a result of thorough analysis of a good many spectroscopic information, Sheline [10] has come to the conclusion that there is a sizeable stable octupole deformation in 153,154,155Eu ' the deformation parameter/13 for the odd-neutron a54Eu being greater than for the adjacent even-N nuclei. According to [10] this difference in the values of f13 is responsible for the inverted OES observed in Eu isotopes. In this connection a question of importance arises: whether this unusual behaviour of A (r 2) (the inverted OES) will remain for the more neutron-rich Eu isotopes; or, whether the region of stable octupole deformation comprises these nuclei too.To answer this question we ha...

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“…As can be seen from Table 2, only the SkM', G~, T3 and T9 forces provide e-values in a reasonable agreement with the experiment. At the same time the T3 and T9 forces should be rejected in view of their failure to describe isotopic shifts [11 ]. The standard DM describes isobaric data rather good, in contrast to DM with the more recent parametrisation [19] (see Table 2).…”

Section: Theoretical Description Of the Isotonic And Isobaric Dependementioning

confidence: 96%

“…The data on Eu and Tb are missing in his "1990-best-values" Table, so the data from [7] and [8] were taken. There are a number of@ z > measurements for stable Sm isotopes.…”

Section: Isotonic and Isobaric Dependencies Of Nuclear Charge Radiimentioning

confidence: 99%

“…Comparison with the Hartree-Fock calculations [2,3] shows that the gross behaviour of charge radii in long isotopic chains is rather informative. In particular, this behaviour is very sensitive to the choice of effective nucleon-nucleon forces [2,3]. Our intention in this paper is to demonstrate that the general character of isotonic and isobaric dependencies of nuclear charge radii are also crucial for theory.…”

Section: Introductionmentioning

confidence: 98%

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Isotonic and isobaric dependencies of nuclear charge radii for rare-earth nuclei

Barzakh

Denisov

1993

Z. Physik A - Hadrons and Nuclei

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Abstract. Isotonic and isobaric dependencies of nuclear charge radii in the region between Z = 54 and Z = 70 are obtained from the analysis of isotope shift data fi (r 2) and muonic and electron scattering data on (r2). They are compared with the predictions of the droplet model and the Hartree-Fock calculations. The isobaric dependencies of (r 2) have proven to be especially sensitive to the choice of an effective nucleon-nucleon interaction.PACS: 21.10.Ft, Ky; 31.10.Gs radii. For evaluating such dependencies one needs, besides the isotopic changes of (r 2) deduced from optical isotopic shifts, also the absolute value of(r 2) for at least one isotope in each isotopic chain. The latter can be taken from muonic spectroscopy or from electron scattering measurements on stable nuclei. In Table 1 the values with the smallest uncertainties being exploited when the data on (r 2) were available for several stable isotopes of an element involved (for example, 138Ba, 144Nd,

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Nuclear deformation of holmium isotopes

Cited by 51 publications

References 22 publications

Nuclear structure and decay properties of even–even nuclei in Z = 70−80 drip-line region

Nuclear structure and decay properties of even–even nuclei in Z = 70−80 drip-line region

Odd-even staggering in nuclear charge radii of neutron-rich europium isotopes

Isotonic and isobaric dependencies of nuclear charge radii for rare-earth nuclei

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