Cross section measurements for gallium in the neutron energy range of 13.5 to 14.8MeV

Abstract

Cross sections for (n,2n), (n,p) and (n,n´α) reactions have been measured on gallium isotopes at the neutron energies of 13.5–14.8 MeV using the activation technique. The monoenergetic neutron beam was produced via the 3H(d,n) 4He reaction. The neutron fluences were determined using the monitor reaction 27Al(n,α) 24Na. The activities induced in the reaction products were measured using high-resolution gamma-ray spectrometry. Data are reported for the following reactions: 69Ga(n,2n) 68Ga, 71Ga(n,2n) 70Ga, 69Ga(n,p)69mZn, 71Ga(n,p)71mZn and 71Ga(n,n´α) 67Cu. Nuclear model calculations using the code HFTT, which employs the Hauser–Feshbach (statistical model) and exciton model (precompound effects) formalisms, were undertaken to describe the formation of the reaction products. Results are discussed and compared with some corresponding values found in the literature, with some established systematics and with the evaluated data given in ENDF/B-VII.0, CENDL-3.1 and JENDL-4.0.

Evaluation of neutron nuclear data for gallium

“…The (n, 2n) reaction cross sections are shown in Figures 8-10. As for 69 Ga, the present evaluation goes through the recent measurements [49][50][51][52], but is much smaller than the data of Bormann et al [53] especially above 15 MeV. Although they provide important activation data in a wide energy range, the measured data are sometimes considerably larger than other experimental data or evaluated data, as seen in Refs.…”

Evaluation of the 1077 keV γ-ray emission probability from 68 Ga decay

“…Therefore, we consider our present value for 1077 keV γ-ray emission probability to be superior to other results, such as the NDS values [5]. references En/MeV original cross section/mb adjusted cross section/mb Molla [15] 14.8 803±153(Pγ(γ1077 keV)=3.5%) 1033±197(Pγ(γ1077 keV)=2.72%) Zhang [16] 14.9 929±37(Pγ(γ1077 keV)=3%) 1025±41(Pγ (γ1077 keV)=2.72%) Luo [17] 14.8 933±90(Pγ(γ1077 keV)=3.2%) 1047±101(Pγ(γ1077 keV)=2.72%) Bormann [1] 14.8 1057±86(I β+ =88%) 1043±85(I β+ =89.2%) JIANG Li-Yang [4] 14.9 1030±31(I β+ =89.4%) 1032±32(I β+ =89.2%)…”