A magnetic electron separator for beta spectroscopy with a Ge(HP)-detector

Measurements of?-endpoint-energies using a magnetic electron separator

“…We have shown that precise /3-endpoint measurements of exotic nuclei are possible at ISOLDE using the Ge(HP)-detector of [10] and the magnetic electron separator of [2]. We are able to work with high/%source strengths, thus reaching in a short beam-time excellent statistics and almost zero background above the fl-endpoint.…”

“…Our experiment (see * This work is part of the doctoral thesis of M. Przewloka also Fig. 1) was placed in the UR-8 experimental hall using the mass separated ISOLDE II ion beam and consisted of a newly constructed achromatic magnetic electron separator [2], a new tape transport system and a Ge(HP) electron detector [3][4][5][6][7].…”

Q ? -Measurements of indium, tin and antimony isotopes with massesA=128 and 130

“…The separator was equipped with a high-temperature ion source [-7] providing sources of indium from thermal neutron induced fission of 235U with a contamination from neighbouring masses of about 10 -4. Listmode formatted/?7-coincidence matrices were recorded on a PDP-11 based data-acquisition system sampling signals from a high precision Ge(HP)-AE-(Gas)/% telescope [8] correlated in time to events from a 40% Ge(HP) 7-detector. Both detectors were mounted under an angle of 180 degrees at distances of approximately 3.0 cm and 5.0 cm relative to a fixed mylar tape on which the mass separated indium ions were collected.…”

“…The energy loss of the electrons in the A E-Gas detector system is known to be 21(1.5)keV [8]. This error together with the influence of the detector response (5 keV) [9], the nonlinearity (1 keV) and quantizing uncertainty (2 keV) of the 12 bit-ADC and the calibration error (1.0 keV) result in a systematic error of 10.5 keV.…”