Precision measurements in nuclear β ‐decay with LPCTrap
The experimental achievements and the current program with the LPCTrap device installed at the LIRAT beam line of the SPIRAL1‐GANIL facility are presented. The device is dedicated to the study of the weak interaction at low energy by means of precise measurements of the β−ν angular correlation parameter. Technical aspects as well as the main results are reviewed. The future program with new available beams is briefly discussed.
Transport and cooling of singly charged noble gas ion beams
The transport and cooling of noble gas singly-charged ion beams by means of a Radio Frequency Quadrupole Cooler Buncher (RFQCB) have been studied at the LIMBE low energy beam line of the GANIL facility. Ions as light as $^{4}He^+$ have been cooled and stored before their extraction in bunches using $H_2$ as buffer gas. Bunches characteristics have been studied as a function of the parameters of the device. Sizeable transmissions of up to 10 $% $ have been obtained. A detailed study of the lifetime of ions inside the buncher has been performed giving an estimate of the charge exchange cross-section. Results of a microscopic Monte-Carlo transport code show reasonable agreement with experimental data.
Die Art der Gamow-Teller-Wechselwirkung beim Zerfall von Li8
ZusammenfassungZiel dieser Arbeit war, aus der Elektron-Antineutrino-Winkelkorrelation beim Zerfall des Li8 eine Entscheidung darüber abzuleiten, ob beim Gamow-Teller-Zerfall tensorielle oder achsiale Kopplung vorliegt. Die experimentellen Ergebnisse zeigen das Überwiegen der achsialen Kopplung.