A shell-model investigation of the binding energies of some exotic isotopes of sodium and magnesium

Watt, Alexander; Singhal, R.P.; Storm, M H; Whitehead, R.R.

doi:10.1088/0305-4616/7/7/004

Cited by 75 publications

(34 citation statements)

References 10 publications

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“…The sdpf ′ interaction cannot describe the B(E2) values across the sd-pf region unless one invokes two sets of effective charges (e p =1.5, e n =0.3 in the A<40 region, and e p =1.2, e n =0.1 in the A>40 region). Furthermore, binding energies were not well reproduced in the sdpf ′ interaction, although the excitation spectrum for a light nucleus (e.g., 22 Mg) was of the same quality as that of the sdpf interaction. The occupation of the full pf -shell in the neutron-rich nuclei is similar in both the sdpf and sdpf ′ interactions by construction, although more particles occupy levels other than f 7/2 in the sdpf ′ case.…”

Section: B the Effective Shell-model Interactionmentioning

confidence: 95%

Shape coexistence and the effective nucleon-nucleon interaction

et al. 1999

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Section: B the Effective Shell-model Interactionmentioning

confidence: 95%

Shape coexistence and the effective nucleon-nucleon interaction

et al. 1999

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“…to study shell effects and pairing energies, -to test the nucleon-nucleon effective interactions used in Hartree-Fock calculations, -to test the shell model which could be developed up to Z = 20 [22].…”

Section: Why?mentioning

confidence: 99%

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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“…This deformation, which was later confirmed also for the Mg isotopes [2] and other nuclei with Z ≈ 11 and N ≈ 20, was not expected within a simple sd-shell model picture. To reproduce the ground state deformation at N = 20 it is required to involve particle-hole excitations across the N = 20 shell gap by involving pf -shell neutron configurations [3]. The region where these intruder states become the ground state is known as the "island of inversion" [4].…”

Section: Introductionmentioning

confidence: 99%

The deformed 0⁺state in³⁴Si

Paschalis¹,

Fallon²,

Macchiavelli³

et al. 2011

J. Phys.: Conf. Ser.

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Abstract. The energy of the lowest deformed 2-particle 2-hole (2p2h) 0 + state in even-even N = 20 nuclei is a key observable directly related to the size of the neutron N = 20 shell closure. 34 Si, with 14 protons and 20 neutrons, lies at the boundary of the "island of inversion", where the deformed 2p2h 0 + state is the ground state in even-A nuclei. In 34 Si, the 2p2h 0 + state is expected to be particularly low lying -in some theories it is even predicted to lie below the first 2 + state. While there have been a number of attempts, using various techniques, no experiment to date has been able to firmly locate the 34 Si 2p2h 0 + state although a number of candidates have been suggested. Here we present, for the first time, data obtained from a fusion-evaporation reaction 18 O( 18 O, 2p) to produce 34 Si. Gammasphere and Microball were used to detect γ-γ coincidences and charged particles (two protons), respectively. The increased sensitivity of this experiment using γ-γ coincidences and a high charged-particle detection efficiency helped to exclude previously reported candidates and provided a stringent limit on the anticipated γ decay from the first 2 + state to the 2p2h 0 + state.

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A shell-model investigation of the binding energies of some exotic isotopes of sodium and magnesium

Cited by 75 publications

References 10 publications

Shape coexistence and the effective nucleon-nucleon interaction

Shape coexistence and the effective nucleon-nucleon interaction

Laser spectroscopy and mass measurements on alkali isotopes

The deformed 0⁺state in³⁴Si

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A shell-model investigation of the binding energies of some exotic isotopes of sodium and magnesium

Cited by 75 publications

References 10 publications

Shape coexistence and the effective nucleon-nucleon interaction

Shape coexistence and the effective nucleon-nucleon interaction

Laser spectroscopy and mass measurements on alkali isotopes

The deformed 0+state in34Si

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The deformed 0⁺state in³⁴Si