Use
Lawrencium has been synthesized only in very minute quantities. It was first synthesized by irradiating a mixture of californium isotopes with boron ions:
The isotope obtained this way has a half-life of about 4.2 seconds and is an alpha emitter.
Lawrencium-256 ( ~35 seconds) is prepared by bombarding americium-243 with oxygen-18:
All lawrencium isotopes of masses 255 to 260 have been synthesized by bombardment of transuranium elements with heavy ions.