Pairing-energy coefficients of neutron-rich fragments in spallation reactions

Fei Niu; Chun-Wang Ma

doi:10.1088/1674-1137/42/3/034102

Chinese Physics C> 2018, Vol. 42> Issue(3) : 034102 DOI: 10.1088/1674-1137/42/3/034102

Pairing-energy coefficients of neutron-rich fragments in spallation reactions

Fei Niu ^1,2 ,
Chun-Wang Ma ^1,,

1.
Institute of Particle and Nuclear Physics, Henan Normal University, Xinxiang 453007, China
2.
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
3.
Institute of Particle and Nuclear Physics, Henan Normal University, Xinxiang 453007, China

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Abstract：
The ratio of pairing-energy coefficient to temperature (a_p/T) of neutron-rich fragments produced in spallation reactions has been investigated by adopting an isobaric yield ratio method deduced in the framework of a modified Fisher model. A series of spallation reactions, 0.5A and 1A GeV ²⁰⁸Pb + p, 1A GeV ²³⁸U + p, 0.5A GeV ¹³⁶Xe + d, 0.2A, 0.5A and 1A GeV ¹³⁶Xe + p, and ⁵⁶Fe + p with incident energy ranging from 0.3A to 1.5A GeV, has been analysed. An obvious odd-even staggering is shown in the fragments with small neutron excess (I≡ N-Z), and in the relatively small-A fragments which have large I. The values of a_p/T for the fragments, with I from 0 to 36, have been found to be in a range from -4 to 4, and most values of a_p/T fall in the range from -1 to 1. It is suggested that a small pairing-energy coefficient should be considered in predicting the cross sections of fragments in spallation reactions. It is also concluded that the method proposed in this article is not good for fragments with A/A_s > 85% (where A_s is the mass number of the spallation system).
- pairing energy ,
- neutron-rich isotope ,
- spallation reaction ,
- asymmetric nuclear matter

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Fei Niu and Chun-Wang Ma. Pairing-energy coefficients of neutron-rich fragments in spallation reactions[J]. Chinese Physics C, 2018, 42(3): 034102. doi: 10.1088/1674-1137/42/3/034102

Fei Niu and Chun-Wang Ma. Pairing-energy coefficients of neutron-rich fragments in spallation reactions[J]. Chinese Physics C, 2018, 42(3): 034102. doi: 10.1088/1674-1137/42/3/034102 shu

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Received: 2017-10-24
Revised: 2017-12-25

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Supported by National Natural Science Foundation of China (U1732135), Natural Science Foundation of Henan Province (162300410179) and Henan Normal University for the Excellent Youth (154100510007)

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Pairing-energy coefficients of neutron-rich fragments in spallation reactions

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Pairing-energy coefficients of neutron-rich fragments in spallation reactions

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