Abstract
The HELIcal Orbit Spectrometer (HELIOS) was developed at Argonne National Laboratory, USA around a decade ago. The device has been a success in studies of the neutron single-particle properties thanks to its simple and elegant design whereby the recoiling charged particles are confined by a uniform magnetic field and travel in helical orbits, resulting in a large acceptance and superb energy resolution in nuclear transfer reactions.
In this seminar, I will talk about the design and operating principles of the HELIOS spectrometer as well as discoveries made with the device in the past decade. A short list of nuclei which have been being studied are 14B, 16C, 18N, 20O, 29Mg, 88Sr, 90Zr, 92Mo, 137Xe, and 207Hg. Determination of the single-particle energies and the corresponding orbital occupancies in such nuclei provide us a gateway to study the evolution of the shell structure in exotic nuclei.
Anyone interested is welcome to attend.