Same SubgrauP, Ir haS the quantum numberS (sr, rs), P the quantum numbers (-'"-',), and for Ao one has (0,0). It then follows that the (Rom') system in this reaction is uniquely in an "I"=1 state, hence, that the reaction amplitude is purely antisymmetric under E'~~m'. But this means that the differential cross section must be symmetric under interchange of the K' and &' momentuxn vectors. (3) Similarly, consider the reaction y+p-+ PI *+Z++sr+. In the octet model of SU(3) one can define a subgroup" " '4 N. Cabibbo and R. Gatto, Nuovo Cirnento 21, 872 (1961). similar to the one discussed under (2). With respect to this subgroup, K+ and~+ belong to a common doublet L("I", "I,")= (-', ,-',) fOr Z+; (s,-',) fOr Ir+]; p haS the quantum numbers (-, ',-' ,), the 1385-MeV resonance F'I *, supposedly belonging to the representation ten, " has the quantum numbers (ss, rs), and the photon transforms like a scalar (0,0). Therefore, the (%+sr+) system in this reaction is in a pure "I"= 1 state, hence, the reaction amplitude is symmetric under K+~&+.

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The problem of producing extremely high magnetic fields is briefly reviewed in the light of modern technique. The design, performance, and application of a pulsed-field system capable of more than 750 000 gauss at room temperature is described. The coil comprises a suitably supported, machined, beryllium-copper, helix having an inside diameter of 316 in. and a length of about ½ in.; it is connected directly to a 2000 μf, 3 kv bank of surge capacitors by means of a triggered-spark gap. The discharge is oscillatory with a half-period of 120 μsec. Detailed design data and performance characteristics are presented for a large range of similarly constructed coils which afford increased volume and field uniformity at a sacrifice in field intensity. A coil providing transverse access to the field and one suitable for operation in liquid helium are also described. Characteristics of less durable coils constructed of a single strip of conductor are discussed. Brief comments on applications to a broad range of solid-state experiments and some inherent limitations are presented. Finally, the production of modulated pulsed fields, unidirectional fields, and the feasibility of extending the pulse duration are discussed.