Proton Inelastic Scattering on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>56</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>in Inverse Kinematics

Kraus, G.; Egelhof, P.; Fischer, C. R.; Geißel, H.; Himmler, A.; Nickel, F.; Münzenberg, G.; Schwab, W.; Weiss, André; Friese, J.; Gillitzer, A.; Körner, H. J.; Peter, M.; Henning, W.; Schiffer, J. P.; Kratz, J. V.; Chulkov, L. V.; Golovkov, M. S.; Ogloblin, A. A.; Brown, B. A.

doi:10.1103/physrevlett.73.1773

Cited by 99 publications

(92 citation statements)

References 8 publications

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“…In Ca and Sc isotopes, the calculations give overbinding at the end of the isotope chain, N = 32 and 34, respectively, with large error-bars in the experimental data. Note that, for 52 Ca, the experimental data was taken from Ref. [33], where the value Q β− =7.9(5) MeV is adopted.…”

Section: B Binding Energymentioning

confidence: 99%

New effective interaction forpf-shell nuclei and its implications for the stability of theN=Z=28closed core

et al. 2004

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The effective interaction GXPF1 for shell-model calculations in the full pf shell is tested in detail from various viewpoints such as binding energies, electro-magnetic moments and transitions, and excitation spectra. The semi-magic structure is successfully described for N or Z = 28 nuclei, 53 Mn, 54 Fe, 55 Co and 56,57,58,59 Ni, suggesting the existence of significant core-excitations in low-lying nonyrast states as well as in high-spin yrast states. The results of N = Z odd-odd nuclei, 54 Co and 58 Cu, also confirm the reliability of GXPF1 interaction in the isospin dependent properties. Studies of shape coexistence suggest an advantage of Monte Carlo Shell Model over conventional calculations in cases where full-space calculations still remain too large to be practical.

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Section: B Binding Energymentioning

confidence: 99%

New effective interaction forpf-shell nuclei and its implications for the stability of theN=Z=28closed core

et al. 2004

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“…→ 2 + 1 ) value are often interpreted as indications for magicity. In fact, the B(E2) rate in 68 Ni (280 ± 60 e 2 fm 4 [7]) is significantly smaller than that in the well-established double-magic nucleus 56 Ni (620±120 e 2 fm 4 [9]). As discussed in Ref.…”

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confidence: 99%

How magic is the magic68Ninucleus?

et al. 2003

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We calculate the B(E2) strength in 68 Ni and other nickel isotopes using several theoretical approaches. We find that in 68 Ni the gamma transition to the first 2 + state exhausts only a fraction of the total B(E2) strength, which is mainly collected in excited states around 5 MeV. This effect is sensitive to the energy splitting between the f p shell and the g 9/2 orbital. We argue that the small experimental B(E2) value is not strong evidence for the double-magic character of 68 Ni.The appearance of shell gaps associated with magic nucleon numbers is one of the cornerstones of nuclear structure. The presence of magic gaps allows one, for example, to determine the single-particle energies and the residual interaction among valence nucleons, providing essential input for nuclear models. Magic gaps offer a natural way of performing truncations in microscopic many-body calculations. Magic nuclei also play an essential role in the two major nucleosynthesis networks (s-and r-process) that produce the majority of nuclides heavier than mass number A ∼ 60.The doubly-magic character of 68 Ni (Z=28, N =40) was suggested in the early eighties [1,2] and tested experimentally [4][5][6][7]. The proton number Z=28 in the nickel isotopes is magic. In the neutrons, the sizeable energy gap at N =40 separates the pf spherical shell from the g 9/2 intruder orbit. However, this spherical subshell closure is not sufficiently large to stabilize the spherical shape. [Experimentally [3], 80 Zr (N =Z=40) behaves like a well-deformed rotor.] The current experimental evidence about the double-magicity of 68 Ni is controversial [8]. On the one hand, 68 Ni does not show a pronounced irregularity in the two-neutron separation energies, as is expected for a magic nucleus. On the other hand, the lowered position of the 0 [10], the size of the N =40 gap strongly depends on the effective interaction used, and it dramatically influences the quadrupole collectivity of the N =40 nuclei. While there is much discussion in the literature about the weakening of shell effects in neutronrich nuclei (e.g., the magic gap N =28 seems to be eroded in drip-line systems; see Ref.[10] and references quoted therein), 68 Ni lies very far from the expected neutron drip line (expected to be around 92 Ni [11]) and one should probably not invoke "exotic" explanations when discussing the stucture of this neutron rich nucleus.It is the aim of this Letter to draw attention to the total B(E2; 068 Ni, which can hold the key to the question whether this nucleus is magic or not. We will argue that the transition to the first excited 2 + state constitutes only a small part of the total B(E2) strength and that the total B(E2) strength depends sensitively on the size of the N = 40 shell gap.To understand the structural difference between 68 Ni and 56 Ni (where the transition to the first 2 + state exhausts most of the total low-energy strength), we begin from qualitative arguments based on a simple independent particle model (IPM). Proton configurations in both nuclei are id...

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“…This provides strong motivation to investigate the structure of this nucleus, as stressed in Ref. [15]. The measurement of GMR and GQR in 56 Ni also represents a first step in the study along the Ni isotopic chain.…”

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confidence: 99%