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Détraz, C.; Guillemaud, D.; Huber, G.; Klapisch, R.; Langevin, M.; Naulin, F.; Thibault, C.; Carraz, L.C.; Touchard, F.

doi:10.1103/physrevc.19.164

Cited by 284 publications

(227 citation statements)

References 15 publications

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“…Far away from the valley of β stability, experimental evi- * tbraunroth@ikp.uni-koeln.de dence for a variety of interesting phenomena has already been found. Prominent examples are the collapse of shell closures [1,2], the emergence of new pronounced shell gaps [3,4], shape coexistence [5] and widespread regions characterized by quickly and continuously evolving nuclear properties, e.g. the evolution of quadrupole collectivity in neutron-rich isotopes around N = 40.…”

Section: Introductionmentioning

confidence: 99%

Reduced transition strengths of low-lying yrast states in chromium isotopes in the vicinity ofN=40

et al. 2015

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Background: In neutron-rich nuclei around N = 40 rapid changes in nuclear structure can be observed. While 68 Ni exhibits signatures of a doubly magic nucleus, experimental data along the isotopic chains in even more exotic Fe and Cr isotopes -such as excitation energies and transition strengths -suggest a sudden rise in collectivity toward N = 40.Purpose: Reduced quadrupole transition strengths for low-lying transitions in neutron-rich 58,60,62 Cr are investigated. This gives quantitative new insights into the evolution of quadrupole collectivity in the neutron-rich region close to N = 40. Method:The recoil distance Doppler-shift (RDDS) technique was applied to measure lifetimes of low-lying states in 58,60,62 Cr. The experiment was carried out at the NSCL with the SeGA array in plunger configuration coupled to the S800 magnetic spectrograph. The states of interest were populated by means of one-proton knockout reactions.Results: Data reveal a rapid increase in quadrupole collectivity for 58,60,62 Cr toward N = 40 and point to stronger quadrupole deformations compared to neighbouring Fe isotopes. The experimental B(E2) values are reproduced well with state-of-the-art shell model calculations using the LNPS effective interaction. A consideration of intrinsic quadrupole moments and B42 ratios suggest an evolution toward a rotational nature of the collective structures in 60,62 Cr. Compared to 58 Cr, experimental B42 and B62 values for 60 Cr are in better agreement with the E(5) limit. Conclusion:Our results indicate that collective excitations in neutron-rich Cr isotopes saturate at N = 38 which is in agreement with theoretical predictions. More detailed experimental data of excited structures and interband transitions are needed for a comprehensive understanding of quadrupole collectivity close to N = 40. This calls for additional measurements in neutron-rich Cr and neighbouring Ti, Fe nuclei.

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Section: Introductionmentioning

confidence: 99%

Reduced transition strengths of low-lying yrast states in chromium isotopes in the vicinity ofN=40

et al. 2015

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“…Measurements of γ decays and determination of the neutron separation energy were achieved in a thermal neutron capture on 26 Mg experiment [20]. Studies of the β decay of 27 Na were achieved from the fragmentation of iridium and uranium targets by protons to measure γ decays, β-γ-γ coincidences, and absolute intensities [21,22].…”

Section: Introductionmentioning

confidence: 99%

High-spin states in Al29 and Mg27

Dungan¹,

Tabor²,

Lubna³

et al. 2016

Phys. Rev. C

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The structure of 29 Al and 27 Mg was investigated using the reactions 18 O( 14 C,p2n) and 18 O( 14 C,α n) at 40 MeV. The charged particles were detected and identified with a ∆E-E telescope in coincidence with γ radiation detected in the Florida State University (FSU) Compton suppressed γ detector array. The level and decay schemes of both nuclei have been expanded at higher spins and excitation energies. The positive-parity states up to 3.5 to 4.5 MeV agree well with shell model calculations using the USDA interaction. The negative-parity states in 27 Mg are reproduced relatively well by one-particle-hole calculations with the WBP-a interaction. Three 27 Mg states unbound by 0.4 to 1.4 MeV to neutron decay were observed to decay radiatively. One of these states had been previously observed to γ decay in a (d,pγ) experiment along with a surprising 16 other neutron unbound states. The competition between neutron and gamma decay in these states is discussed in terms of angular momentum barriers and spectroscopic factors.

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“…Static deformations near the neutron drip line have been observed for Sodium and Magnesium isotopes [16] and are inferred for some Sulfur elements from their β decay properties [17]. Studies of these nuclei have been limited to shell model calculations including two major shells [18,19] and to pure HF or relativistic Hartree calculations [7].…”

Section: Introductionmentioning

confidence: 99%

3D solution of Hartree-Fock-Bogoliubov equations for drip-line nuclei

Terasaki¹,

Heenen²,

Flocard³

et al. 1996

Nuclear Physics A

117

141

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We investigate the possibility of describing triaxial quadrupole deformations for nuclei close to the two-neutron drip line by the Hartree-Fock Bogoliubov method taking into account resonances in the continuum. We use a Skyrme interaction to describe the HarteeFock hamiltonian and a density-dependent zero-range interaction to evaluate the pairing field. The mean-field equations are solved in a three-dimensional cubic mesh. We study the stability of the two-neutron separation energies and of the description of the nuclear surface as a function of the number of active mean-field orbitals and of the size of the mesh. The even Ni isotopes are used as a test case and the accuracy as a function of quadrupole deformation is studied by performing constrained calculations. A first application to the study of the two-neutron separation energies in Ni isotopes up to the drip line is presented.

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Beta decay ofNa27−32and their descendants

Cited by 284 publications

References 15 publications

Reduced transition strengths of low-lying yrast states in chromium isotopes in the vicinity ofN=40

Reduced transition strengths of low-lying yrast states in chromium isotopes in the vicinity ofN=40

High-spin states in Al29 and Mg27

3D solution of Hartree-Fock-Bogoliubov equations for drip-line nuclei

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