The neutron time-of-flight facility at the Hamburg isochronous cyclotron

Inclusive neutron spectra from the break-up of3He in peripheral collisions with27Al,63Cu,93Nb,197Au

“…Discrepancies in shape appear mostly at the high energy limit where the proton data [10] suffer from the lack of PE subtractions and the neutron data from the uncertainties in subtracting the neutron background (shadow bar run) at a 100 Bb/MeV level [13]. In particular the calculations at least qualitatively reproduce the opposite energy shift of the BU bumps indicating that, in the DWBA description of the reaction, the wave functions in entrance and exit channel take the Coulomb effect correctly into account.…”

“…The experiment was performed at our neutron timeof-flight facility [13] with metallic target foils of 1.4 to 7.7 mg/cm 2 thickness. Neutron spectra have been measured with 8 cylindrical liquid scintillators NE213 of size 10.2 cm ~25 x 5.1 cm, detection thresholds E~, h 1 MeV and flight paths of(7.5 +__0.5) m for 24 roughly equidistant angles between 3 ~ and 177 ~ The detectors were heavily shielded.…”

Preequilibrium emission in (p, x n) reactions on palladium isotopes

“…Measurements were supplemented by empty-targetframe runs in order to correct for the background. Neutrons and 7-rays were discriminated using the pulseshape technique with a high level of confidence [15]. Figure 1 shows a TOF spectrum typical of the forward detectors with 20 m flight paths.…”

“…The thicknesses of the targets were 4.0 mg/cm z, 5.0 mg/cm 2, 9.85 mg/cm 2, 4.8 mg/cm 2, and 5.0 mg/cm z, respectively. The standard Hamburg TOF setup [15] consists of 8 liquid scintillator detectors with appropriate shielding and a target chamber surrounded by two bending magnets which produce a total deflection of the beam of 34 ~ . There are three optional target positions: the first located in front of the first magnet, the second between the two magnets, and the third behind the second magnet.…”

7 Neutron Detectors

“…It may be movable in relation to the beam direction to enable measurement in different directions [129]. Alternatively, several detectors at fixed positions are used [130,131]. Combined with several target positions it is possible to obtain a satisfactory angular resolution.…”