Yield of ¹⁴O for the Reactions ¹⁴N(p, n) ¹⁴O, ¹²C(³He, n) ¹⁴O and ¹²C(α, 2n)¹⁴O

Abstract

The excitation function and thick target yield curve were measured for the 14 N(p, n) 14 0 reaction up to about 15 MeV proton energy. Thick target yield curves were measured for the reactions 14 N(p,a¡)"C, 12 C( 3 He,n) 14 0, 12 C( 3 He,a)' 1 C, 12 C(a. 2n) 14 0 and 12 C ( α, α η) 11 C up to about 15 Me V proton energy and 40 MeV 3 He and α-particle energies. The 14 O and 11 C yields were compared. The resultant low 14 0 yields are shown to be explicable by the even-odd effect (pairing energy) for the product nuclides.

Production of [15O]water at low-energy proton cyclotrons

“…This can be expressed as a saturation yield per µA by correcting for the finite irradiation time and dividing by the beam current. These results are shown in These saturation yields can be compared to the known radioisotope production yields for 15 O (Takács et al, 2003) and 14 O (Nozaki and Iwamoto, 1981). As shown in Table 1, we observe about 30% of the theoretical activity.…”

“…A simple system has been developed that can separate and deliver radiologically produced water from a nitrogen/hydrogen mix while recycling the target gas, allowing Nozaki and Iwamoto (1981), 14 N(p,n) 14 O, 0.14 GBq/µA (± 15%)…”

Comparison Of Expected Yields For Light Radioactive Beams At SPIRAL-1 And 2

“…Unfortunately, yields deduced from experimental cross-sections 17 and those directly measured for a thick-target 18 differ by a factor 7. At SPIRAL-1 the reaction used to produce this isotope is 16 O projectile fragmentation on a C target.…”

“…The in-target yields (particles per second) expected at SPIRAL-2 for 14,15 O, 18 F, 18,19 Ne, 21,22 Na, 22,23 Mg, 26 Si, 29 (triangles). When using cross-sections the following equation (eq.1) is used…”

“…For instance, 15 C, 16,17,18 N rates have been calculated using MCNP code at GANIL. The target is Al 2 O 3 (=  natural /3).…”