Details

Autor(en) / Beteiligte

• Hirose, K
• Nishio, K
• Tanaka, S
• Léguillon, R
• Makii, H
• Nishinaka, I
• Orlandi, R
• Tsukada, K
• Smallcombe, J
• Vermeulen, M J
• Chiba, S
• Aritomo, Y
• Ohtsuki, T
• Nakano, K
• Araki, S
• Watanabe, Y
• Tatsuzawa, R
• Takaki, N
• Tamura, N
• Goto, S
• Tsekhanovich, I
• Andreyev, A N

Titel

Role of Multichance Fission in the Description of Fission-Fragment Mass Distributions at High Energies

Ist Teil von

• Physical review letters, 2017-11, Vol.119 (22), p.222501-222501, Article 222501

Ort / Verlag

United States

Erscheinungsjahr

2017

Quelle

PROLA

Beschreibungen/Notizen

• Fission-fragment mass distributions were measured for ^{237-240}U, ^{239-242}Np, and ^{241-244}Pu populated in the excitation-energy range from 10 to 60 MeV by multinucleon transfer channels in the reaction ^{18}O+^{238}U at the Japan Atomic Energy Agency tandem facility. Among them, the data for ^{240}U and ^{240,241,242}Np were observed for the first time. It was found that the mass distributions for all the studied nuclides maintain a double-humped shape up to the highest measured energy in contrast to expectations of predominantly symmetric fission due to the washing out of nuclear shell effects. From a comparison with the dynamical calculation based on the fluctuation-dissipation model, this behavior of the mass distributions was unambiguously attributed to the effect of multichance fission.