MAYA: An active-target detector for binary reactions with exotic beams

Demonchy, C. E.; Caamaño, M.; Wang, H.; Mittig, W.; Roussel‐Chomaz, P.; Savajols, H.; Chartier, M.; Cortina-Gil, D.; Fomichev, A. S.; Frémont, G.; Gangnant, P.; Gillibert, A.; Giot, L.; Golovkov, M. S.; Jurado, B.; Libin, J. F.; Obertelli, A.; Pollaco, E.; Родин, А. М.; Spitaëls, C.; Stepantsov, S. V.; Ter‐Akopian, G. M.; Wolski, R.

doi:10.1016/j.nima.2007.09.022

Cited by 60 publications

(34 citation statements)

References 11 publications

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“…The proposed studies will be realised with the existing workhorses Miniball [19] and T-REX [28] plus new instrumentation for transfer reaction studies such as the active targets MAYA [29] and the future ACTAR, a new general purpose scattering chamber, the two arms CORSET setup from GSI,...etc. The Miniball array will be complemented with an electron spectrometer, SPEDE, to realise Coulomb excitation studies of odd-heavy nuclei.…”

Section: The Hie-isolde Projectmentioning

confidence: 99%

Highlights of the ISOLDE facility and the HIE-ISOLDE Project

Borge

2016

EPJ Web of Conferences

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The ISOLDE Radioactive Beam Facility is the dedicated CERN installation for the production and acceleration of radioactive nuclei far from stability. Exotic nuclei of most chemical elements are available for the study of nuclear structure, nuclear astrophysics, fundamental symmetries and atomic physics, as well as for applications in condensed-matter and life sciences. Since more than a decade it offers the largest variety of post-accelerated radioactive beams in the world today. In order to broaden the scientific opportunities beyond the reach of the present facility, the on-going HIE-ISOLDE (High Intensity and Energy) project will provide major improvements in energy range, beam intensity and beam quality. Post-accelerated beams will be available already this year boosting the beam energy of the current REX LINAC to 4.3 MeV/u reaching 5.5 MeV/u next spring. In this new energy regime the Coulomb excitation cross sections are strongly increased with respect to the previous energy of bearly 3 MeV/u and many transfer reaction channels will open. The second stage of the energy upgrade will allow energies of the beam up to 10 MeV/u for the worst scenario of A/q = 4.5. The funds are already secured and it is expected to be completed in 2017. In this contribution the present status of the ISOLDE facility will be discussed, some highlights will be briefly described to illustrate the advances of the facility. The HIE-ISOLDE project will be described together with a panorama of the physics cases to be addressed in the near future with emphasis in the day-one experiment to be done this year. 201, EPJ Web of Conferences

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Section: The Hie-isolde Projectmentioning

confidence: 99%

Highlights of the ISOLDE facility and the HIE-ISOLDE Project

Borge

2016

EPJ Web of Conferences

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“…The first experiment to measure the GMR in an exotic nucleus was performed at GANIL with a 56 Ni secondary beam at 50 MeV/nucleon and the MAYA active target filled with deuterium gas [19]. The properties of the GMR could be deduced from the excitation energy spectrum and the angular distributions with results comparable to neighboring stable nuclei such as 56 Fe or 58 Ni [20].…”

Section: Inelastic Scatteringmentioning

confidence: 99%

Reactions with exotic nuclei: recent results and challenges

Roussel‐Chomaz

2011

J. Phys.: Conf. Ser.

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Abstract. The interaction of exotic nuclei with various targets and implying different types of reactions allows to access a rich variety of information. Some examples of the latest results and recent developments related to some of these reactions are reviewed. IntroductionWith the availability of secondary beams of relatively good optical qualities and intensities, and thanks to the construction of sophisticated experimental equipment, it is now possible to perform experiments where the secondary beams interact with a target, and to study the different reactions, which come into play. Reactions with exotic beams are mainly used to study the structure of exotic nuclei. This is specifically the case of the so-called direct reactions, namely elastic and inelastic scattering, transfer and knock-out reactions. This is presently the main focus of experiments related to reactions with exotic nuclei, and the present review will illustrate some of the many subjects that can be addressed in this domain.Direct reactions with exotic beams are usually performed in inverse kinematics, by using light targets with simple structure such as proton, deuterons, or alpha. The structure information on the nucleus of interest are extracted either via the missing mass method from the kinematical characteristics (angle and energy) of the light recoil nucleus, or via the invariant mass method where the fragments from the ejectile are measured in order to reconstruct their relative energy spectrum.We shall review in the following the different types of direct reactions and the latest results obtained especially for the light neutron rich nuclei. Reactions mechanisms with exotic beams and their specificities are also a subject, which will be briefly addressed.

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“…is new approach has been used in the experimental study of the 7 H system [6], performed at GANIL (France), where a secondary beam of 8 He with an energy of 15.4 MeV per nucleon was produced in the Spiral facility by the Isotope Separation On Line (ISOL) technique [8]. e experimental detection setup consisted mainly of the active target MAYA [9] H identification is more complex due to its unstable nature. e scattered 7 H decays very rapidly, before being detected, into triton and four neutrons ( 7 H→ t+4n).…”

Section: Study Of Very Exotic Nuclear Systemsmentioning

confidence: 99%

Probing nuclear forces at the extreme of isospin: the⁷H resonance

Cortina-Gil

Mittig

2010

Europhysics News

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EPN 41/2 23 t has been observed that,in these systems,nuclear forces manifest themselves in different ways.is is interpreted presently as an isospin dependence, and is questioning our understanding of the behaviour of nuclear matter going from proton-rich to neutron-rich matter. e description of nuclear forces in these weakly bound nuclear systems represents an enormous challenge. e interaction between nucleons is responsible for the creation of particular structures. e study of these structures, at the limit of nuclear binding and beyond,where non-perturbative phenomena become important, is a unique source of information."Ab initio" calculations illustrate nicely these non-perturbative phenomena. ese calculations start from interactions describing perfectly a large body of nucleon-nucleon scattering data and then solve, without further approximation, the nuclear n-body problem. However, they fail completely in reproducing macroscopic observables as, for example, nuclear binding energies (see figure 1) [1]. ese large discrepancies are attributed to the importance of 3-body forces: the interaction between two nucleons is modified by the presence of a third nucleon. non-perturbative phenomena in nuclear physicsWe can explain nuclear interaction in terms of virtual pion exchange between two nucleons. is exchange may, for example, result in an excitation of the Δ-resonance [unstable nuclear state defined by a mean energy value (E R ) and a given width (Γ R ), determined by its half-life (dt) due to the relation Γ R .dt = ħ] of one of the nucleons that interacts in this excited state with a 3 rd nucleon present in the nuclei. is last interaction can be seen as a higher order correction of the original interaction of the first two nucleons. e importance of this higher order correction is not due to the strength associated with the interaction but to its intrinsic nature. Properties of very strong Coulomb interaction have been tested in the Mott-scattering of Pb+Pb [2]. e Coulomb potential energy in this system is of the order of 500 MeV, one order of magnitude higher than the binding energy of the systems of figure 1. However, in this particular case higher order corrections, such as vacuum polarization, are only of the order of 10

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MAYA: An active-target detector for binary reactions with exotic beams

Cited by 60 publications

References 11 publications

Highlights of the ISOLDE facility and the HIE-ISOLDE Project

Highlights of the ISOLDE facility and the HIE-ISOLDE Project

Reactions with exotic nuclei: recent results and challenges

Probing nuclear forces at the extreme of isospin: the⁷H resonance

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MAYA: An active-target detector for binary reactions with exotic beams

Cited by 60 publications

References 11 publications

Highlights of the ISOLDE facility and the HIE-ISOLDE Project

Highlights of the ISOLDE facility and the HIE-ISOLDE Project

Reactions with exotic nuclei: recent results and challenges

Probing nuclear forces at the extreme of isospin: the7H resonance

Contact Info

Product

Resources

About

Probing nuclear forces at the extreme of isospin: the⁷H resonance