A total of 10 cross section data sets were found in the literature. Five works used highly enriched 68Zn targets for cross section measurements. There are five "production cross section" measurements for natZn(p,xn)67Ga process which results can also be used for evaluation between 17 and 30 MeV. In this energy range the contribution of the 67Zn(p,n)67Ga reaction can be neglected due to the low isotopic abundance of 67Zn in a natural zinc matrix and the magnitude of the cross section of the 67Zn(p,n)67Ga reaction. The influence of the 70Zn(p,4n)67Ga process to the production cross sections is also negligible because of the very low isotopic abundance of 70Zn in natural zinc (0.62%). From these 10 data sets 3 were excluded while the 7 others were selected for further evaluation. The list of related references given below is accompanied with additional information. We mention availability of data in the computerized database EXFOR (if available, unique EXFOR reference number is given). Further, we indicate a reason why a data set was excluded (reference denoted by an asterisk *).
 

Barandon J.N., Debrun J.L., Kohn A., and Spear R.H.:
Etude du dosage de Ti, V, Cr, Fe, Ni, Cu et Zn par activation avec des protons d'energie limitee a 20 MeV.
Nuclear Instruments Methods 127(1975) 269
Exfor: O0086

Bonardi M.and Birattati C.:
Optimization of irradiation parameters for Ga-67 production from Zn(p,xn) nuclear reactions.
J. Radioanalytical Chemistry 76 (1983) 311
Exfor: none

Hermanne A. (1994)
Data taken from:
Szelecsényi F., Boothe T. E., Takács S., Tárkányi F., and Tavano E.:
valuated Cross Section and Thick Target Yield Data Bases of Zn+p Processes for Practical Applications.
Applied Radiation Isotopes 49 (1998) 1005
Exfor: A0494

Hermanne A., Szelecsényi F., Sonck M., Takács S., Tárkányi F. and Van den Winkel P.:
New cross section data on ⁶⁸Zn(p,2n)⁶⁷Ga and ^natZn(p,xn)⁶⁷Ga nuclear reactions for the development of a reference data base.
J. Radioanalytical Nuclear Chemistry 240 (1999) 623
Exfor: none

Kopecky P.:
Cross sections and production yields of  ⁶⁶Ga and  ⁶⁷Ga for proton reactions on natural zinc.
Appl. Radiat. Isot. 41 (1990) 606 Exfor: none
Data excluded: cross section values are too low.

Levkovski V. N.:
Cross-sections of Medium Mass Nuclide Activation (A=40-100) by Medium Energy Protons and Alpha Particles (E=10-50).
Inter- Vesi, 1991, Moscow, USSR
Exfor: A0510

* Little F.E. and Lagunas-Solar M.C.:
Cyclotron production of  ⁶⁷Ga. Cross sections and thick-target yields for the ⁶⁷Zn(p,n) and ⁶⁸Zn(p,2n) reactions.
International J. Applied Radiation Isotopes 34 (1983) 631
Exfor: A0321
Data excluded: energy shift towards higher energy.

* McGee T., Rao C.L., Saha G.B. and Yaffe L.:
Nuclear interactions of  ⁴⁵Sc and ⁶⁸Zn with protons of medium energy.
Nuclear Physics A150 (1970) 11
EXFOR : B0053
Data excluded: cross section values too low (even after normalisation by the compiler).

Nortier F.M., Mills S. and Steyn G.F.:
Excitation functions and yields of relevance to the production of ⁶⁷Ga by proton bombardment of ^natZn and ^natGe up to 100 MeV.
Applied radiation Isotopes 42 (1991) 353
Exfor: A0498

Tárkányi F., Szelecsényi F., Kovács Z. and Sudár S.:
Excitation functions of proton induced nuclear reactions on enriched ⁶⁶Zn, ⁶⁷Zn and ⁶⁸Zn . Production of ⁶⁷Ga and ⁶⁶Ga.
Radiochimica Acta 50 (1990) 19
Exfor: D4004
 

The data from papers where experimental numerical values were available (10 papers), are collected in Fig. 5.1.2a. From these 2 works were excluded while the remaining 8 works were selected for further evaluation.

Cross sections were calculated by two different versions of the nuclear reaction model code ALICE (denoted as HMS and IPPE), by the nuclear reaction model code PREMOD-HFMOD (denoted as HF), by the nuclear reaction model code SPEC and by Padé fitting with 9 parameters). These results are compared to selected experimental data in Fig. 5.1.2b. It is seen that model calculations generally over predict the cross sections below the energy point of maximal cross section while above that point they under estimate the cross sections. The best approximation was judged to be the Padé fit. Recommended cross sections are compared with selected experimental data, including their error bars, in Fig. 5.1.2c. Yields calculated from the recommended cross sections are presented in Fig. 5.1.2d. The corresponding numerical values for recommended cross sections and yields are tabulated in Tab. 5.1.2a and Tab. 5.1.2b, respectively.