New magic nuclei and conditions of their formation

Boboshin, I. N.; Варламов, В.В.; Ishkhanov, B. S.; Romanovskii, E.A.

doi:10.3103/s1062873807030057

Cited by 4 publications

(7 citation statements)

References 5 publications

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“…6,8 He [22,23], 11 Be [24], 11 Li [25]; the predictions of proton halos [26] and the cluster-like structures in several Ne [26,27] and Mg isotopes [28]. Structural changes in exotic nuclei can lead to a quenching or even complete disappearance of shell closures, whereas new magic numbers can emerge as shown in many theoretical [21,[29][30][31][32][33], experimental [34][35][36] and empirical [1,2] studies. Usually, rapid nuclear structure changes appear in localized regions of the nuclear chart.…”

Section: Light Nucleimentioning

confidence: 97%

“…The only full isotonic radii curve crossing the proton number Z = 14 is that for N = 16 (see figures 3 and 4(a)). An additional motivation for considering this case is the recent work of Boboshin et al [1,2]. Based on the broad systematic of several nuclear observables-E 1 (2 + ) and quadrupole deformation β 2 (occasionally R 4/2 is included)-over the whole nuclide chart, these authors formulated an empirical j-j coupling rule for new double magic nuclei applicable to various single particle subshells.…”

Section: Correlations Around Z = 14-16mentioning

confidence: 99%

“…shell closures and changes in deformation. Recently, remarkable correlations among different nuclear observables have been recognized predominantly in the intermediate and heavy mass regions that provide a new perspective in the study of structural evolution and can be a guide for future measurements [1][2][3]. The correlations obtained empirically are a challenge for nuclear theory: the predictive power of nuclear models for the nuclear mass regions investigated can be tested by trying to fit these parameter sets by different nuclear models.…”

Section: Introductionmentioning

confidence: 99%

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Correlations of nuclear charge radii with other nuclear observables

Angeli

Marinova

2015

J. Phys. G: Nucl. Part. Phys.

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Empirical correlations between nuclear charge radii and several other experimental ground and excited state observables of even–even nuclei are presented for different regions in the nuclear chart. The correlation among the isotonic development of these observables around the classical magic proton numbers is considered starting from Z = 82 to lower magic Z. Special attention is paid to the structural evolution along the isotonic chains around the ‘traditional’ magic proton numbers 8 and 20. The remarkable correlations recognized there indicate shell structure changes and the appearance of new non-traditional single or double magic-like numbers, as Z = 6, 14, 16. The results add new information to the properties of light nuclei. As the mechanisms responsible for the modification of nuclear shell closures are still under discussion, the experimental information obtained is of crucial importance to better constrain the theoretical models. The effect of nuclear deformation on radii and their global correlation over the full mass number region is also investigated.

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Section: Light Nucleimentioning

confidence: 97%

Section: Correlations Around Z = 14-16mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correlations of nuclear charge radii with other nuclear observables

Angeli

Marinova

2015

J. Phys. G: Nucl. Part. Phys.

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“…It is worth noting that the neutron number N = 56 was revealed and discussed as the "new magic" one from quite different point of view in Ref. [8].…”

mentioning

confidence: 99%

“…Attention is drawn to the fact that among the considered isotopic chains the maximal C values have isotopes of Ca and Zr. Just these two chains contain two isotopes each with the magic neutron numbers -40,48 Ca and 90,96 Zr (about "magic" features of the neutron number N = 56 see [8]). …”

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confidence: 99%

The role of neutron pairs in nuclear collective properties

Goncharova

Tretyakova

Fedorov

2016

EPJ Web of Conferences

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Abstract. The role of surface neutrons in nuclear properties was examined by comparing rigidities of nuclear collective vibrations and charge radii of even-even nuclei. Correlations of peaks in rigidities and minimal values of r 0 = R ch · A −1/3 parameters were revealed.Eighty years of nuclear investigations have revealed a large variety in nuclear characteristics, their consistent theoretical interpretation is up to now only partly successful. For example, the theory of multipole giant resonances (MGR) observed experimentally in the cross sections of different reactions on even-even nuclei cannot explain in full extent a great variety of their forms and widths. E.g., in the region of middle-mass nuclei the giant E1 resonance has a complicated structure. It is a well-known phenomenon and many more or less successful attempts were made to describe the GR structure in magic and semimagic nuclei. However, as one can see from experimental data, sometimes addition of a couple of neutrons drastically changes the envelope of resonance peak.One may assume that one of the sources of diversity in the resonance shape is a variety of rigidities of nuclear surface. This characteristic of nuclei was discussed already at the dawn of nuclear physics when liquid drop model of nuclei was created [1,2].In the collective coordinate representation the Hamiltonian of the nuclear surface vibrations reads [1]where the momenta b λμ conjugate to collective coordinates a λμ which describe the deformation of nuclear surface. The coefficient B λ is the vibrational mass parameter. The rigidity C λ which determines the potential energy of nuclear deformation is connected with the nuclear surface tension. For the quadrupole surface vibrations (λ = 2) the connection of rigidity with the surface tension σ of a nucleus having the charge and radius Ze and R, respectively, has the formIt was already mentioned in [1] that the nuclear rigidity (deformability) may considerably vary from nucleus to a e-mail: n.g.goncharova@gmail.com nucleus and is strongly influenced by its shell structure. Nuclear rigidity as regards to quadrupole vibrations is connected with the energy of the first collective 2 + 1 state and the mean squared deformation of a nucleus βThe values of β were estimated and listed in [3] for all at that time available even-even nuclei. The estimations were based on the measured probabilities of quadrupole transitions to the ground states B(2). Certainly, the results are model dependent and the variations in the root-mean-square deformation estimations is less than 20%.In this work, we present the results of comparison of the calculated rigidities with the charge radii parameters for several isotopic chains of even-even nuclei. The data on the nuclear charge radii are taken from [4]. The dependence of nuclear charge radii on the neutron number is shown in [5].

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Nuclear charge radii as signature for structural changes

Angeli

Marinova

2016

J. Phys.: Conf. Ser.

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New magic nuclei and conditions of their formation

Cited by 4 publications

References 5 publications

Correlations of nuclear charge radii with other nuclear observables

Correlations of nuclear charge radii with other nuclear observables

The role of neutron pairs in nuclear collective properties

Nuclear charge radii as signature for structural changes

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