Author
Benedicte Million
Other affiliations: Istituto Nazionale di Fisica Nucleare
Bio: Benedicte Million is an academic researcher from University of Milan. The author has contributed to research in topics: Dipole & Excited state. The author has an hindex of 16, co-authored 76 publications receiving 932 citations. Previous affiliations of Benedicte Million include Istituto Nazionale di Fisica Nucleare.
Topics: Dipole, Excited state, Angular momentum, Scintillator, Neutron
Papers published on a yearly basis
Papers
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Daresbury Laboratory1, University of Milan2, Polish Academy of Sciences3, Keele University4, Technische Universität Darmstadt5, University of Liverpool6, Lund University7, Jagiellonian University8, Chinese Academy of Sciences9, Sofia University10, Katholieke Universiteit Leuven11, Uppsala University12
01 Feb 2005-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The Rare Isotopes Investigation at GSI project combines the former EUROBALL Ge-Cluster detectors, the MINIBALL Ge detectors, BaF2--HECTOR detectors, and the fragment separator at the GSI for high-resolution in-beam gamma-ray spectroscopy measurements with radioactive beams.
Abstract: The Rare ISotopes INvestigation at GSI project combines the former EUROBALL Ge-Cluster detectors, the MINIBALL Ge detectors, BaF2--HECTOR detectors, and the fragment separator at GSI for high-resolution in-beam gamma-ray spectroscopy measurements with radioactive beams. These secondary beams produced at relativistic energies are used for Coulomb excitation or secondary fragmentation experiments in order to explore the nuclear structure of the projectiles or projectile like nuclei by measuring de-excitation photons. The newly designed detector array is described and the performance characteristics are given. Moreover, particularities of the experimental technique are discussed.
116 citations
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TL;DR: In this article, a large acceptance spectrometer based on the EUROBALL composite CLOVER detectors was installed at the LNL ALPI linac to study the nuclear structure towards moderately neutron-rich nuclei by means of quasi-elastic and deep inelastic reactions.
Abstract: Following the commissioning of the PRISMA large-acceptance spectrometer, installed at the Laboratori Nazionali di Legnaro (LNL), an international nuclear-structure collaboration has started to develop a large $\gamma$
-ray setup to be installed in the target position of the spectrometer. The array is based on the EUROBALL composite CLOVER detectors. In this contribution the CLOVER detector array is described and its expected performance figures discussed. This new setup, by using the high-intensity heavy-ion beams provided by the LNL ALPI linac, will push the study of nuclear structure towards moderately neutron-rich nuclei by means of quasi-elastic and deep inelastic reactions.
81 citations
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TL;DR: In this article, the first excited 2 + states in 54,56,58Cr were populated by Coulomb excitation at relativistic energies and γ rays were measured using the RISING setup at GSI.
58 citations
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TL;DR: In this paper, the angular distributions of photons associated with the damping of excited-state giant dipole resonances (GDR) in hot and rotating 161,162 Yb nuclei have been measured in exclusive experiments using the HECTOR array.
58 citations
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TL;DR: Angular distributions of the γ rays give for the first time evidence that the enhancement is dominated by dipole transitions.
Abstract: Here, the γ-ray strength function of 56Fe has been measured from proton-γ coincidences for excitation energies up to ≈11 MeV. The low-energy enhancement in the γ-ray strength function, which was first discovered in the (3He,αγ)56Fe reaction, is confirmed with the (p,p'γ)56Fe experiment reported here. Angular distributions of the γ rays give for the first time evidence that the enhancement is dominated by dipole transitions.
54 citations
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28,685 citations
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TL;DR: In this paper, the structural evolution along the isotonic and isotopic chains around the “traditional” magic numbers 8, 20, 28, 50, 82 and 126 is discussed using complementary experimental information, such as the binding energies of the orbits bounding the shell gaps.
466 citations
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TL;DR: In this article, the concept of spontaneous symmetry breaking is applied to the rotating mean field of nuclei, which is based on the tilted-axis cranking model, taking into account that the rotational axis can take any orientation with respect to the deformed density distribution.
Abstract: The concept of spontaneous symmetry breaking is applied to the rotating mean field of nuclei. The description is based on the tilted-axis cranking model, which takes into account that the rotational axis can take any orientation with respect to the deformed density distribution. The appearance of rotational bands in nuclei is analyzed, focusing on weakly deformed nuclei at high angular momentum. The quantization of the angular momentum of the valence nucleons leads to new phenomena. Magnetic rotation represents the quantized rotation of the anisotropic current distribution in a near spherical nucleus. The restricted amount of angular momentum of the valence particles causes band termination. The discrete symmetries of the mean-field Hamiltonian provide a classification scheme of rotational bands. New symmetries result from the combination of the spatial symmetries of the density distribution with the vector of the angular momentum. The author discusses in detail which symmetries appear for a reflection-symmetric density distribution and how they show up in the properties of the rotational bands. In particular, the consequences of rotation about a nonprincipal axis and of breaking the chiral symmetry are analyzed. Also discussed are which symmetries and band structures appear for non-reflection-symmetric mean fields. The consequences of breaking the symmetry with respect to gauge and isospin rotations are sketched. Some analogies outside nuclear physics are mentioned. The application of symmetry-restoring methods to states with large angular momentum is reviewed.
396 citations
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TL;DR: In this paper, the relevance of the open quantum system formalism for the description of weakly bound nuclei far from the valley of stability, small droplets of neutral atoms, gas of trapped atoms, open microwave cavities and quantum dots is discussed.
292 citations
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TL;DR: A spectroscopic study of the neutron-rich nucleus 54Ca using proton knockout reactions involving fast radioactive projectiles highlights the doubly magic nature of 54Ca and provides direct experimental evidence for the onset of a sizable subshell closure at neutron number 34 in isotopes far from stability.
Abstract: Atomic nuclei are finite quantum systems composed of two distinct types of fermion--protons and neutrons. In a manner similar to that of electrons orbiting in an atom, protons and neutrons in a nucleus form shell structures. In the case of stable, naturally occurring nuclei, large energy gaps exist between shells that fill completely when the proton or neutron number is equal to 2, 8, 20, 28, 50, 82 or 126 (ref. 1). Away from stability, however, these so-called 'magic numbers' are known to evolve in systems with a large imbalance of protons and neutrons. Although some of the standard shell closures can disappear, new ones are known to appear. Studies aiming to identify and understand such behaviour are of major importance in the field of experimental and theoretical nuclear physics. Here we report a spectroscopic study of the neutron-rich nucleus (54)Ca (a bound system composed of 20 protons and 34 neutrons) using proton knockout reactions involving fast radioactive projectiles. The results highlight the doubly magic nature of (54)Ca and provide direct experimental evidence for the onset of a sizable subshell closure at neutron number 34 in isotopes far from stability.
292 citations