Basic Concepts in Nuclear Physics: Theory, Experiments and Applications by unknow

Author:unknow
Language: eng
Format: epub
ISBN: 9783030222048
Publisher: Springer International Publishing

3.4.2 Transfer

The transfer of one nucleon from a nucleus (stripping) or to a nucleus (pickup) is a powerful tool to determine the nature of the populated states. More quantitatively, the final states after pickup and stripping from the same nucleus and the corresponding population cross sections give access, in principle, to single-particle energies, i.e. energies of orbitals with no correlation effect. Effective single-particle energies are the backbone of many nuclear models and their comparison to experimentally-deduced energies is important. Two-nucleon transfer has been extensively used to study two-nucleon correlations inside the nucleus. Transfer cross sections are often analyzed through the DWBA and coupled-channel formalisms.

A large part of our understanding of nuclear structure is based on transfer reactions. Transfer is a key tool and a work horse for the main low-energy facilities worldwide such as GANIL, ISOLDE in Europe, TRIUMF and ANL in North America. A large part of the physics programs at future facilities is based on transfer reactions: HIE-ISOLDE at CERN, SPIRAL2 (France), SPES (Italy), Re3-12 at FRIB (USA) or the OEDO project at the RIBF, RIKEN (Japan). Transfer reaction experiments with radioactive beams are mostly based on the detection of recoil light charged particles. Several recent or ongoing developments of detectors aim at improving the energy or angular resolution as well as the detection efficiency, compared to the previous generation of detectors. To mention few of them: the ACTAR Time Projection Chamber [20] is a follow up of the MAYA detector [21] first developed at GANIL and the GRIT Si-based telescope array [22] compact enough to fit inside a photon-detection array such as PARIS [23] or AGATA [24] partly issued from the MUST2-array developments [25] (see Fig. 3.15). These instrumentations were primarily developed for transfer and inelastic scattering experiments. These new devices are complemented by the development of the very thin pure hydrogen target CHyMENE [18]. Recently, the project of a storage ring at ISOLDE has been accepted [26]. In the US, a complementary approach based on the use of magnetic field is beginning to be explored. The leading projects focusing on transfer and inelastic scattering studies are AT-TPC [27], a TPC located inside a solenoid, and HELIOS [28], a novel setup using Si detectors inside a solenoid that allows an as so far unreached energy resolution when very thin targets are used.

Fig. 3.15Picture of four MUST2 telescopes arranged in a compact forward angle geometry for an experiment at GANIL.

Courtesy F. Flavigny

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