Abstract
Cross sections for the70,76Ge(n,2n),72,73Ge(n,p) and72,74Ge(n,α) reactions have been measured at the 5.5 MV tandem T11/25 Accelerator Laboratory of NCSR Demokritos, using the activation technique. Neutron beams have been produced in the ~16-20 MeV energy region, by means of the3H(d,n)4He reaction. The maximum flux has been determined to be of the order of 105n/cm2s, while the flux variation of the neutron beam was monitored by using a BF3 detector. The cross section has been deduced with respect to the27Al(n,α)24Na and93Nb(n,2n)92mNb reference reactions. The contaminations from reactions induced on neighboring Ge isotopes and leading to the same residual nucleus, have been taken into account. After the end of the irradiations, the activity induced by the neutron beams at the targets and reference foils, has been measured by HPGe detectors. Statistical model calculations using the EMPIRE code were performed on the data measured in this work as well as on data reported in literature.
Highlights
Studies of excitation functions of neutron induced reactions are of considerable interest, for their importance to fundamental research in nuclear physics, and for practical applications such as dosimetry and reactor technology [1,2,3]
Neutron-induced reactions on Ge isotopes have been investigated in the past by our group [4, 5], in the energy range of ∼8-11 MeV, by using the 2H(d,n)3He reaction
The ground state of 69Zn decays directly to the ground state of 69Ga, while the metastable state decays to the ground state of 69Zn emitting the characteristic 438.6 keV gamma-ray, with intensity 94.85%, which can be used for the determination of the σm cross section. 71Zn is produced both in its 1/2− ground state (T1/2= 2.45 m) and its metastable 9/2+ (T1/2= 3.96 h) state
Summary
Studies of excitation functions of neutron induced reactions are of considerable interest, for their importance to fundamental research in nuclear physics, and for practical applications such as dosimetry and reactor technology [1,2,3]. Concerning Ge, besides its importance as a semi-conducting material, (n,2n) reactions on even-even Ge isotopes present high cross sections of hundreds of millibarns, increasing considerably the number of neutrons in neutron fields. Extensive data exist at energies around 15 MeV, where the discrepancies are even higher, while only few data points exist in the higher energy regions. In view of these remarks, a continuation of this project has started for the measurement of
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