Erratum to “Production of neutron-rich isotopes by cold fragmentation in the reaction 197Au+Be at 950 A MeV”[Nucl. Phys. A 660 (1999) 87–100]

Benlliure, J.; Schmidt, K.‐H.; Cortina‐Gil, D.; Enqvist, T.; Farget, F.; Heinz, A.; Junghans, A. R.; Pereira, J.; Taïeb, J.

doi:10.1016/s0375-9474(00)00201-3

Cited by 34 publications

(60 citation statements)

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“…We propose here a simplified scheme, in the same spirit as the cold fragmentation model [22], to capture the essence of the two regimes depicted in Figs. 2 and 3.…”

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confidence: 99%

Evaporation-cost dependence in heavy-ion fragmentation

Audirac¹,

Obertelli²,

Doornenbal³

et al. 2013

Phys. Rev. C

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Inclusive multineutron and multiproton removal cross sections from 112 Sn and 104 Sn at relativistic energies have been measured. The data show two distinct regimes of the reaction process that depend on the nucleon evaporation cost of the final nucleus. This behavior is universal by regarding the mass or asymmetry of the initial system or target composition. A state-of-the-art cascade and deexcitation model reproduces the observed trend but systematically fails in reproducing cross sections for the removal of the more bound nucleon species. The fragmentation of a many-body bound system from the fast collision with an extra particle is a generic problem in areas as different as atomic physics through electron-induced ionization [1], nuclear physics through the nuclear fragmentation in spallation targets [2], or astrophysics through the ejection of rocks from gravitational rings after asteroid collisions [3]. This complex process depends a priori on the two-body interaction cross section, the geometry of the system, and the binding of its individual constituents. This multiparticle removal probability is challenging to predict to a high precision since it also depends on processes, such as the re-interaction of scattered components and the release of dissipation energy by statistical emission of particles, e.g., the ionization of atoms by energetic electrons is impacted by the Auger effect. Models for nuclear fragmentation have been numerous [4]. At kinetic energies larger than 100 MeV/nucleon, it is possible to accurately reproduce experimental fragmentation cross sections by modeling the reaction in two steps: intranuclear cascade (INC) followed by statistical deexcitation of the remnant nucleus [2]. Fragmentation results from the interplay of both processes [5]. In the case of one-nucleon removal, the proton-neutron asymmetry has recently demonstrated important limits of our treatment of direct reactions [6,7], and the role of evaporation in weakly bound nuclei has been questioned for deeply bound nucleon removal [8]. In this Rapid Communication, we present new fragmentation data from stable and unstable Sn isotopes at incident energies of ∼165 MeV/nucleon. We characterize these data by the difference in emission cost between the removed species and the other one, C = C removed − C other , where C n = S n is the neutron-evaporation cost, C p = S p + V c is the proton-evaporation cost, S n(p) is the neutron (proton) separation energy, and V c is the Coulomb barrier. We show that the ejection of identical nucleons presents two universal regimes that depend on the sign of C.Fast 104 Sn and 112 Sn beams at 155 and 173 MeV/nucleon, respectively, have been produced at the RIBF facility, operated conjointly by the RIKEN Nishina Center and the CNS of the University of Tokyo, by fragmentation of a 124 Xe primary beam of 0.5 e μA onto a 0.555 g/cm 2 9 Be production target. The secondary cocktail beams were composed of 104 Sn ( 112 Sn) at 25% (77%) purity. The achieved intensity of 104 Sn was 350 pps. Secondary targets w...

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“…We propose here a simplified scheme, in the same spirit as the cold fragmentation model [22], to capture the essence of the two regimes depicted in Figs. 2 and 3.…”

mentioning

confidence: 99%

Evaporation-cost dependence in heavy-ion fragmentation

Audirac¹,

Obertelli²,

Doornenbal³

et al. 2013

Phys. Rev. C

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“…The production cross sections of the residues are shown by the color scale. A detailed description of the experimental technique and data analysis procedure can be found in references [13][14][15].…”

Section: Resultsmentioning

confidence: 99%

Investigating the intra-nuclear cascade process using the reaction¹³⁶Xe on deuterium at 500 AMeV

Alcántara-Núñez

Benlliure

Pérez–Loureiro

et al. 2010

EPJ Web of Conferences

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Abstract. More than 600 residual nuclei, formed in the spallation of 136 Xe projectiles impinging on deuterium at 500 AMeV of incident energy, have been unambiguously identified and their production cross sections have been determined with high accuracy. By comparing these data to others previously measured for the reactions 136 Xe + p at 1 AGeV and 136 Xe + p at 500 AMeV we investigated the role that neutrons play in peripheral collisions and to understand the energy dissipation in frontal collisions in spallation reactions.

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“…Based on the results of ABRABLA calculations, we can state that the observed new neutron-rich isotopes of the elements between 60 ≤ Z ≤ 66 are produced mainly by fission, while fragmentation plays the major role in the production of the isotopes of the elements above Z=72. For the most neutron-rich nuclei, predictions of the analytical COFRA [16] code have been used for the range of elements where fragmentation is dominant. The COFRA model is in general also in good agreement with the experimental data, although gradual deviations from the experimental results can be observed for the heaviest (Os-Pt) nuclei.…”

Section: Discovery Of New Neutron-rich Isotopesmentioning

confidence: 99%

Recent Precision Experiments with Exotic Nuclei Produced with Uranium Projectiles and Experimental Prospects at Fair

Geißel

Chen

Dickel

et al. 2014

EPJ Web of Conferences

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Abstract.Precision experiments with relativistic fragments separated in-flight require special experimental methods to overcome the inherent large emittance from the creation in nuclear reactions and atomic interactions in matter. At GSI relativistic exotic nuclei have been produced via uranium projectile fragmentation and fission and investigated with the inflight separator FRS directly, or in combination with either the storage-cooler ring ESR or the FRS Ion Catcher. 1000 A·MeV 238 U ions were used to create 60 new neutron-rich isotopes separated and identified with the FRS to measure their production cross sections. In another experimental campaign the fragments were separated in flight and injected into the storage-cooler ring ESR for accurate mass and lifetime measurements. In these experiments we have obtained accurate new mass values analyzed via a novel method which has reduced the systematic errors for both Schottky Mass Spectrometry (SMS) and for Isochronous Mass Spectrometry (IMS). Pioneering experiments have been carried out with the FRS Ion Catcher consisting of three experimental components, the dispersive magnetic system of the FRS with a monoenergetic and a homogeneous degrader, a cryogenic stopping cell filled with pure helium and a multiple-reflection time-of flight mass separator. The FRS Ion Catcher enables high precision spectroscopy experiments with eV to keV exotic nuclides. Results from these different FRS experiments are presented in this overview together with prospects for the next-generation facility Super-FRS. The novel features of the Super-FRS compared with the present FRS will be discussed in addition.

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Erratum to “Production of neutron-rich isotopes by cold fragmentation in the reaction 197Au+Be at 950 A MeV”[Nucl. Phys. A 660 (1999) 87–100]

Cited by 34 publications

References 0 publications

Evaporation-cost dependence in heavy-ion fragmentation

Evaporation-cost dependence in heavy-ion fragmentation

Investigating the intra-nuclear cascade process using the reaction¹³⁶Xe on deuterium at 500 AMeV

Recent Precision Experiments with Exotic Nuclei Produced with Uranium Projectiles and Experimental Prospects at Fair

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Erratum to “Production of neutron-rich isotopes by cold fragmentation in the reaction 197Au+Be at 950 A MeV”[Nucl. Phys. A 660 (1999) 87–100]

Cited by 34 publications

References 0 publications

Evaporation-cost dependence in heavy-ion fragmentation

Evaporation-cost dependence in heavy-ion fragmentation

Investigating the intra-nuclear cascade process using the reaction136Xe on deuterium at 500 AMeV

Recent Precision Experiments with Exotic Nuclei Produced with Uranium Projectiles and Experimental Prospects at Fair

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Investigating the intra-nuclear cascade process using the reaction¹³⁶Xe on deuterium at 500 AMeV