TY - JOUR
T1 - The double focusing iron-core electron-spectrometer "BILL" for high resolution (n, e-) measurements at the high flux reactor in Grenoble
AU - Mampe, W.
AU - Schreckenbach, K.
AU - Jeuch, P.
AU - Maier, B. P.K.
AU - Braumandl, F.
AU - Larysz, J.
AU - von Egidy, T.
PY - 1978/8/1
Y1 - 1978/8/1
N2 - A new high resolution iron-core electron spectrometer (BILL) has been constructed at the High Flux Reactor in Grenoble. It is currently being used for measurements of conversion electrons after thermal neutron capture. An internal target (maximal size 40 cm2) is irradiated in a thermal neutron flux of 3 × 1014 n cm-2 sec-1. The electrons pass through a vertical beam tube, 14 m long and 10 cm in diameter, defining the solid angle of 3.4 × 10-6 / 4π. The spectrometer itself consists of two independent flat electromagnets. Both magnets act as double focusing spectrometers, where the double focusing is achieved by the combination of homogeneous and 1 r fields. The first, a 58° deflecting magnet, forms a 10:1 scaled down intermediate image of the large, 14 m distant target in the reactor hall. The dispersion of this magnet is 94 cm. The second magnet views this reduced image with a very high dispersion of 540 cm. The radius of the optic circle of both magnets is 50 cm. The energy range of the spectrometer is 15 keV < E < 10 000 keV. Multi-wire proportional counters are used as detectors. The best measured momentum resolution has been 8 × 10-5 at 300 keV with a target of 2 × 100 mm2. Routine measurements have been carried out with targets of 30 × 100 mm2 achieving a resolution of Δp/p = 4 × 10-4. The momentum precision of the instrument is 1 part in 105 and the sensitivity for neutron capture conversion electrons 300 μb at 400 keV.
AB - A new high resolution iron-core electron spectrometer (BILL) has been constructed at the High Flux Reactor in Grenoble. It is currently being used for measurements of conversion electrons after thermal neutron capture. An internal target (maximal size 40 cm2) is irradiated in a thermal neutron flux of 3 × 1014 n cm-2 sec-1. The electrons pass through a vertical beam tube, 14 m long and 10 cm in diameter, defining the solid angle of 3.4 × 10-6 / 4π. The spectrometer itself consists of two independent flat electromagnets. Both magnets act as double focusing spectrometers, where the double focusing is achieved by the combination of homogeneous and 1 r fields. The first, a 58° deflecting magnet, forms a 10:1 scaled down intermediate image of the large, 14 m distant target in the reactor hall. The dispersion of this magnet is 94 cm. The second magnet views this reduced image with a very high dispersion of 540 cm. The radius of the optic circle of both magnets is 50 cm. The energy range of the spectrometer is 15 keV < E < 10 000 keV. Multi-wire proportional counters are used as detectors. The best measured momentum resolution has been 8 × 10-5 at 300 keV with a target of 2 × 100 mm2. Routine measurements have been carried out with targets of 30 × 100 mm2 achieving a resolution of Δp/p = 4 × 10-4. The momentum precision of the instrument is 1 part in 105 and the sensitivity for neutron capture conversion electrons 300 μb at 400 keV.
UR - http://www.scopus.com/inward/record.url?scp=0001618998&partnerID=8YFLogxK
U2 - 10.1016/0029-554X(78)90671-7
DO - 10.1016/0029-554X(78)90671-7
M3 - Article
AN - SCOPUS:0001618998
SN - 0029-554X
VL - 154
SP - 127
EP - 149
JO - Nuclear Instruments and Methods
JF - Nuclear Instruments and Methods
IS - 1
ER -