Photonuclear reactions in 45Sc and natCu induced by 2 GeV bremsstrahlung

Photospallation of Complex Nuclei at Intermediate Energies. I

“…Jonsson and Persson [32] mentioned that the isomeric ratios (high spin state/low spin State) of 120.118.11and "11 "In from ^increase with E^, but the best measured ones ('^'-'^^Te) Hatten out at Eo ^ 250 -300 MeV. Also the increase of the isomeric ratios of ^^^In from ^^®Sn(7,p) reaction and of ^^Sc from ^' V(v,2p5n) with the increase of Eo were reported by Bülow et al [41,11], On the other hand, Eriksson and Jonsson [38] studied the isomeric ratios of ''^Sc from '^^Sc, "Mn, ""'Fe, ^'Co and ^^As at £"0^1000 MeV and concluded that the ratios are almost independent of ^o-The results for at Eo = 2 GeV were reported by Bachschi et al [42], and an agreement with the data of Eriksson and Jonsson at lower Eo was found. Our previous results on »"'.se.ssY and 8®Sr from «'Y at £0 = 100 and 200 MeV exhibited £o-independence [40], while those for '^^La and ^^'Ba from '"La increased from 100 to 200 MeV [18].…”

“…As quoted above, Eriksson and Jonsson [38] and Bachschi et al [42] concluded that the YJYg ratios of '^'^Sc increase with increase of complexity {AA = A,-Ap, where A, is the target mass and Ap is the product mass) of the reactions due to build-up of angular momenta during the cascade and evaporation. The present work cannot prove this conclusion.…”

“…Also it is rather difficult to correct the precursor decays in this energy region because of low yields and large associated errors. All the previous studies indicated that the yield of the isomer with spin closer to that of the target is favored and the isomer ratios are independent of the distance from the targets, but Eriksson and Jonsson [38] and Bachschi et al [42] concluded that the ratios of '"^"Sc to increase with increasing complexity of the reaction.…”

A Complementary Study of Photospallation Systematics

“…Products close to the target (A 2 A t -3) were excluded in the analysis. For Eo 2 1 GeV the lightest products were also omitted, since it has been found that these do not follow the spallation pattern [6]. To get a consistent treatment of all data the yields measured in ref.…”

Systematics of Photon- and Electron-Induced Spallation Reactions

“…From the analysis of photospallation data, the authors [1] obtained simple expresResults of the comparative study between the systematics of the present work and that by JONSSON and LINDGREN [1] are presented in Table 3. For such a comparison, we have used formula (1) with the expressions (3,7,8,10), and Κ = 0.466. In the case of bremsstrahlung-induced spallation yields, the χ* -values have been calculated from parameter-values reported in Ref.…”