Excitation functions and isomeric cross section ratios of the Cu63(n,α)60Com,g, Cu65(n,α)62Com,g, and Ni60(n,p)60Com,g processes from 6 to 15 MeV

F. Cserpák, S. Sudár, J. Csikai, S. M. Qaim

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Abstract

Excitation functions were measured for the Cu63(n,α)60Com, Cu65(n,α)62Com, and Cu65(n,α)62Cog reactions over the neutron energy range of 6.3 to 14.8 MeV. Use was made of the activation technique in combination with high resolution γ-ray spectroscopy. The nuetrons were produced via the H2(d,n)3He reaction using a deuterium gas target at a variable energy compact cyclotron (En=6.3-11.9 MeV) and via the H3(d,n)4He reaction using a solid Ti-T target at a neutron generator (En=13.7-14.8 MeV). From the available experimental data isomeric cross section ratios were determined for the isomeric pair Com,60g in Cu63(n,α) and Ni60(n,p) reactions, and for the pair Com,62g in the Cu65(n,α) reaction. Statistical model calculations taking into account precompound effects were performed for the formation of both the isomeric and ground states of the products. The calculational results on the total (n,p) and (n,α) cross sections agree well with the experimental data; in the case of isomeric states, however, some deviations occur. The experimental isomeric cross section ratios are reproduced only approximately by the calculation; at 15 MeV the spin distribution of the level density has a significant effect on the calculation. For low-lying levels the isomeric cross section ratio depends strongly on the spins of the levels involved and not on their excitation energies. At a given neutron energy the population of the higher spin isomer appears to be higher in the (n,α) process than in the (n,p) reaction.

Original languageEnglish
Pages (from-to)1525-1533
Number of pages9
JournalPhysical Review C - Nuclear Physics
Volume49
Issue number3
DOIs
Publication statusPublished - 1994

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cross sections
excitation
neutrons
energy
cyclotrons
deuterium
rays
generators
isomers
activation
deviation
ground state
high resolution
products
gases
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

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Excitation functions and isomeric cross section ratios of the Cu63(n,α)60Com,g, Cu65(n,α)62Com,g, and Ni60(n,p)60Com,g processes from 6 to 15 MeV. / Cserpák, F.; Sudár, S.; Csikai, J.; Qaim, S. M.

In: Physical Review C - Nuclear Physics, Vol. 49, No. 3, 1994, p. 1525-1533.

Research output: Contribution to journalArticle

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abstract = "Excitation functions were measured for the Cu63(n,α)60Com, Cu65(n,α)62Com, and Cu65(n,α)62Cog reactions over the neutron energy range of 6.3 to 14.8 MeV. Use was made of the activation technique in combination with high resolution γ-ray spectroscopy. The nuetrons were produced via the H2(d,n)3He reaction using a deuterium gas target at a variable energy compact cyclotron (En=6.3-11.9 MeV) and via the H3(d,n)4He reaction using a solid Ti-T target at a neutron generator (En=13.7-14.8 MeV). From the available experimental data isomeric cross section ratios were determined for the isomeric pair Com,60g in Cu63(n,α) and Ni60(n,p) reactions, and for the pair Com,62g in the Cu65(n,α) reaction. Statistical model calculations taking into account precompound effects were performed for the formation of both the isomeric and ground states of the products. The calculational results on the total (n,p) and (n,α) cross sections agree well with the experimental data; in the case of isomeric states, however, some deviations occur. The experimental isomeric cross section ratios are reproduced only approximately by the calculation; at 15 MeV the spin distribution of the level density has a significant effect on the calculation. For low-lying levels the isomeric cross section ratio depends strongly on the spins of the levels involved and not on their excitation energies. At a given neutron energy the population of the higher spin isomer appears to be higher in the (n,α) process than in the (n,p) reaction.",
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T1 - Excitation functions and isomeric cross section ratios of the Cu63(n,α)60Com,g, Cu65(n,α)62Com,g, and Ni60(n,p)60Com,g processes from 6 to 15 MeV

AU - Cserpák, F.

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AU - Qaim, S. M.

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N2 - Excitation functions were measured for the Cu63(n,α)60Com, Cu65(n,α)62Com, and Cu65(n,α)62Cog reactions over the neutron energy range of 6.3 to 14.8 MeV. Use was made of the activation technique in combination with high resolution γ-ray spectroscopy. The nuetrons were produced via the H2(d,n)3He reaction using a deuterium gas target at a variable energy compact cyclotron (En=6.3-11.9 MeV) and via the H3(d,n)4He reaction using a solid Ti-T target at a neutron generator (En=13.7-14.8 MeV). From the available experimental data isomeric cross section ratios were determined for the isomeric pair Com,60g in Cu63(n,α) and Ni60(n,p) reactions, and for the pair Com,62g in the Cu65(n,α) reaction. Statistical model calculations taking into account precompound effects were performed for the formation of both the isomeric and ground states of the products. The calculational results on the total (n,p) and (n,α) cross sections agree well with the experimental data; in the case of isomeric states, however, some deviations occur. The experimental isomeric cross section ratios are reproduced only approximately by the calculation; at 15 MeV the spin distribution of the level density has a significant effect on the calculation. For low-lying levels the isomeric cross section ratio depends strongly on the spins of the levels involved and not on their excitation energies. At a given neutron energy the population of the higher spin isomer appears to be higher in the (n,α) process than in the (n,p) reaction.

AB - Excitation functions were measured for the Cu63(n,α)60Com, Cu65(n,α)62Com, and Cu65(n,α)62Cog reactions over the neutron energy range of 6.3 to 14.8 MeV. Use was made of the activation technique in combination with high resolution γ-ray spectroscopy. The nuetrons were produced via the H2(d,n)3He reaction using a deuterium gas target at a variable energy compact cyclotron (En=6.3-11.9 MeV) and via the H3(d,n)4He reaction using a solid Ti-T target at a neutron generator (En=13.7-14.8 MeV). From the available experimental data isomeric cross section ratios were determined for the isomeric pair Com,60g in Cu63(n,α) and Ni60(n,p) reactions, and for the pair Com,62g in the Cu65(n,α) reaction. Statistical model calculations taking into account precompound effects were performed for the formation of both the isomeric and ground states of the products. The calculational results on the total (n,p) and (n,α) cross sections agree well with the experimental data; in the case of isomeric states, however, some deviations occur. The experimental isomeric cross section ratios are reproduced only approximately by the calculation; at 15 MeV the spin distribution of the level density has a significant effect on the calculation. For low-lying levels the isomeric cross section ratio depends strongly on the spins of the levels involved and not on their excitation energies. At a given neutron energy the population of the higher spin isomer appears to be higher in the (n,α) process than in the (n,p) reaction.

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