Development of an 14O ion beam at the 88" cyclotron

At the 88" cyclotron at the Lawrence Berkeley National Laboratory we are developing an intense (3·10⁷ pps), low energy ¹⁴O ion beam to measure the shape of the beta-decay spectrum. The ¹⁴O half-life of 71 seconds requires on-line production of the isotope. ¹⁴O is produced in the form of CO in a high temperature carbon target using a 20 MeV ³He⁺ beam from the LBNL 88" cyclotron via the reaction ¹²C(³He,n)¹⁴O. In order to minimize the background radiation for the planned experiment, the ¹⁴O atoms must be separated from the other radioactive isotopes produced in the carbon target and implanted into a thin carbon foil. For this purpose, we have developed an experimental set-up including the target, a transfer line, an ion source, and a low energy ion beam transport line