2019 Impact factor 2.176
Hadrons and Nuclei


Eur. Phys. J. A 13, 59-62 (2002)

In-beam gamma-ray spectroscopy with exotic beams at the NSCL

T. Glasmacher1, 2, B.V. Pritychenko1, 2, P.D. Cottle3, R.W. Ibbotson1, K.W. Kemper3 and H. Scheit3

1  National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, 48824, USA
2  Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
3  Department of Physics, Florida State University, Tallahassee, FL 32306, USA

(Received: 1 May 2001)

Abstract
Projectile fragmentation provides radioactive beams at intermediate velocities ( v/c=0.3-0.5) by physical means of fragment separation. With the development of position-sensitive photon detectors it has become possible to measure the energies and directions of photons emitted in-flight from such fast-moving exotic beams. This allows the reconstruction of the photons' energies emitted from an exotic projectile with high accuracy. It can be advantageous to employ photon detection in experiments with exotic beams since photons can traverse matter easily and their attenuation can be calculated. Experiments with standard luminosities can be carried out at intermediate beam energies with thick secondary targets (order of g/cm 2) and very low incident beam rates (order of particle/s or less). Experimental success in this field is strongly correlated with the development of photon detectors such as position-sensitive scintillation detectors or segmented germanium detectors. In-beam gamma-ray spectroscopy of fast exotic beams has been successfully used at all projectile fragmentation facilities in intermediate-energy heavy-ion inelastic scattering experiments, knockout reactions and fragmentation reactions. Here, we focus on experimental results for neutron-rich exotic nuclei in the $\pi(sd)$-shell. Measurements and detector developments carried out at the NSCL at Michigan State University during the last four years are discussed.

PACS
27.30.+t - $20 \leq A \leq 38$ .
25.70.Bc - Elastic and quasielastic scattering.
25.70.De - Coulomb excitation.

© Società Italiana di Fisica, Springer-Verlag 2002