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Title: Measurement of cross sections for {alpha}-induced reactions on {sup 197}Au and thick-target yields for the ({alpha},{gamma}) process on {sup 64}Zn and {sup 63}Cu

Abstract

We have measured the cross sections for the {sup 197}Au({alpha},{gamma}){sup 201}Tl and {sup 197}Au({alpha},2n){sup 199}Tl reactions in the 17.9- to 23.9-MeV energy range, and {sup 197}Au({alpha},n){sup 200}Tl reaction in the 13.4- to 23.9-MeV energy range using an activation technique. Thick-target yields for the {sup 64}Zn({alpha},{gamma}){sup 68}Ge (7- to 14-MeV) and {sup 63}Cu({alpha},{gamma}){sup 67}Ga (7-MeV) reactions were measured. For all measurements, natural elements were bombarded with He{sup +} beams from the 88 In. Cyclotron at the Lawrence Berkeley National Laboratory (LBNL). Irradiated samples were counted using a {gamma}-spectrometry system at LBNL's Low Background Facility. Measured {sup 197}Au({alpha},{gamma}){sup 201}Tl cross sections were compared with the NON-SMOKER theoretical values. The thick-target yields for the {sup 64}Zn({alpha},{gamma}){sup 68}Ge and {sup 63}Cu({alpha},{gamma}){sup 67}Ga reactions are also compared with the theoretical yield, calculated numerically using the energy dependent NON-SMOKER cross section data. In both cases, measured values are found to follow a trend of overlapping the predicted value near the alpha nucleus barrier height and fall below with a slowly widening difference between them in the sub-barrier energy points.

Authors:
;  [1];  [2];  [3];  [4]
  1. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  2. Department of Physics, University of California Berkeley, Berkeley, California 94720 (United States)
  3. Lawrence Livermore National Laboratory, Livermore, California 94551, USA (United States)
  4. (United States)
Publication Date:
OSTI Identifier:
20990979
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.75.015802; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA PARTICLES; COPPER 63; CROSS SECTIONS; GALLIUM 67; GAMMA SPECTROSCOPY; GERMANIUM 68; GOLD 197; HELIUM IONS; MASS NUMBER; MEV RANGE; THALLIUM 199; THALLIUM 200; THALLIUM 201; ZINC 64

Citation Formats

Basunia, M. S., Smith, A. R., Shugart, H. A., Norman, E. B., and Department of Nuclear Engineering, University of California Berkeley, Berkeley, California 94720. Measurement of cross sections for {alpha}-induced reactions on {sup 197}Au and thick-target yields for the ({alpha},{gamma}) process on {sup 64}Zn and {sup 63}Cu. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.015802.
Basunia, M. S., Smith, A. R., Shugart, H. A., Norman, E. B., & Department of Nuclear Engineering, University of California Berkeley, Berkeley, California 94720. Measurement of cross sections for {alpha}-induced reactions on {sup 197}Au and thick-target yields for the ({alpha},{gamma}) process on {sup 64}Zn and {sup 63}Cu. United States. doi:10.1103/PHYSREVC.75.015802.
Basunia, M. S., Smith, A. R., Shugart, H. A., Norman, E. B., and Department of Nuclear Engineering, University of California Berkeley, Berkeley, California 94720. Mon . "Measurement of cross sections for {alpha}-induced reactions on {sup 197}Au and thick-target yields for the ({alpha},{gamma}) process on {sup 64}Zn and {sup 63}Cu". United States. doi:10.1103/PHYSREVC.75.015802.
@article{osti_20990979,
title = {Measurement of cross sections for {alpha}-induced reactions on {sup 197}Au and thick-target yields for the ({alpha},{gamma}) process on {sup 64}Zn and {sup 63}Cu},
author = {Basunia, M. S. and Smith, A. R. and Shugart, H. A. and Norman, E. B. and Department of Nuclear Engineering, University of California Berkeley, Berkeley, California 94720},
abstractNote = {We have measured the cross sections for the {sup 197}Au({alpha},{gamma}){sup 201}Tl and {sup 197}Au({alpha},2n){sup 199}Tl reactions in the 17.9- to 23.9-MeV energy range, and {sup 197}Au({alpha},n){sup 200}Tl reaction in the 13.4- to 23.9-MeV energy range using an activation technique. Thick-target yields for the {sup 64}Zn({alpha},{gamma}){sup 68}Ge (7- to 14-MeV) and {sup 63}Cu({alpha},{gamma}){sup 67}Ga (7-MeV) reactions were measured. For all measurements, natural elements were bombarded with He{sup +} beams from the 88 In. Cyclotron at the Lawrence Berkeley National Laboratory (LBNL). Irradiated samples were counted using a {gamma}-spectrometry system at LBNL's Low Background Facility. Measured {sup 197}Au({alpha},{gamma}){sup 201}Tl cross sections were compared with the NON-SMOKER theoretical values. The thick-target yields for the {sup 64}Zn({alpha},{gamma}){sup 68}Ge and {sup 63}Cu({alpha},{gamma}){sup 67}Ga reactions are also compared with the theoretical yield, calculated numerically using the energy dependent NON-SMOKER cross section data. In both cases, measured values are found to follow a trend of overlapping the predicted value near the alpha nucleus barrier height and fall below with a slowly widening difference between them in the sub-barrier energy points.},
doi = {10.1103/PHYSREVC.75.015802},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}
  • We have measured the cross sections for the {sup 197}Au({alpha},{gamma}){sup 201}Tl and {sup 197}Au({alpha},2n){sup 199}Tl reactions in the 17.9- to 23.9-MeV energy range, and {sup 197}Au({alpha},n){sup 200}Tl reaction in the 13.4- to 23.9-MeV energy range using an activation technique. Thick-target yields for the {sup 64}Zn({alpha},{gamma}){sup 68}Ge (7- to 14-MeV) and {sup 63}Cu({alpha},{gamma}){sup 67}Ga (7-MeV) reactions were measured. For all measurements, natural elements were bombarded with He{sup +} beams from the 88'' Cyclotron at the Lawrence Berkeley National Laboratory (LBNL). Irradiated samples were counted using a g-spectrometry system at LBNL's Low Background Facility. Measured {sup 197}Au({alpha},{gamma}){sup 201}Tl cross-sections were compared withmore » the NON-SMOKER theoretical values. The thick-target yields for the {sup 64}Zn({alpha},{gamma}){sup 68}Ge and {sup 63}Cu({alpha},{gamma}){sup 67}Ga reactions are also compared with the theoretical yield, calculated numerically using the energy dependent NON-SMOKER cross section data. In both cases, measured values are found to follow a trend of overlapping the predicted value near the alpha nucleus barrier height and fall below with a slowly widening difference between them in the sub barrier energy points.« less
  • We have measured the cross sections for the197Au(alpha,gamma)201Tl and 197Au(alpha,2n)199Tl reactions in the 17.9-to 23.9-MeV energy range, and 197Au(alpha,n)200Tl reaction in the 13.4-to 23.9-MeV energy range using an activation technique. Thick-targetyields for the 64Zn(alpha,gamma)68Ge (7- to 14-MeV) and63Cu(alpha,gamma)67Ga (7-MeV) reactions were measured. For allmeasurements, natural elements were bombarded with He+ beams from the88-inch Cyclotron at the Lawrence Berkeley National Laboratory (LBNL).Irradiated samples were counted using a gamma-spectrometry system at LBNLs Low Background Facility. Measured 197Au(alpha,gamma)201Tlcross-sections were compared with the NON-SMOKER theoretical values. Thethick-target yields for the 64Zn(alpha,gamma)68Ge and63Cu(alpha,gamma)67Ga reactions are also compared with the theoreticalyield, calculated numerically using the energymore » dependent NON-SMOKER crosssection data. In both cases, measured values are found to follow a trendof overlapping the predicted value near the alpha nucleus barrier heightand fall below with a slowly widening difference between them in the subbarrier energy points.« less
  • Cross sections for the ( gamma ,n) reaction in Cu/sup 63/, Cu/sup 65/, Zn/sup 6 / 4>s, Sb/sup 121/, and Pr/sup 141/ were measured using gamma rays from the Li/sup 7/(p, gamma )Be/sup 8/ and B/sup 11/(p, gamma )C/sup 12/ reactions. NaI(Tl) c rystals were used to monitor the radiation and to measure the residual activity. The Cu/sup 63/( gamma ,n)Cu/sup 62/ cross section for the lithium radiation from the 440 kev resonance is 59 plus or minus 6 mb. The cross sections at 12.2, 14.S, 16.7, and 17.6 Mev are then 11 plus or minus 2, 33 plus ormore » minus 4, 63 plus or minus 8, and 73 plus or minus 8 mb, respectively. These results confirm the bremsstrahlung measurement of the shape of the cross section but the absolute cross section values are 25% lower. Cross sections for the lithium resonance radiation, measured relative to that of Cu/sup 63/, are: Cu/ sup 65/, 70 plus or minus 7 mb; Zn/sup 64/, 40 plus or minus 4 mb; Sb/sup / 1>s/sup 21/, 122 plus or minus 13 mb; Pr/sup 141/, 181 plus or minus 20 mb. Comparison with previous results suggests that discrepancies are due to inaccuracies in absolute beta -counting. (auth)« less