Details

Autor(en) / Beteiligte

• Yanez, R
• Loveland, W
• Yao, L
• Barrett, J S
• Zhu, S
• Back, B B
• Khoo, T L
• Alcorta, M
• Albers, M

Titel

Measurement of the survival probabilities for hot fusion reactions

Ist Teil von

• Physical review letters, 2014-04, Vol.112 (15), p.152702-152702, Article 152702

Ort / Verlag

United States

Erscheinungsjahr

2014

Quelle

APS

Beschreibungen/Notizen

• We have studied the fission-neutron emission competition in highly excited (274)Hs (Z=108) (where the fission barrier is due to shell effects) formed by a hot fusion reaction. Matching cross bombardments ((26)Mg+(248)Cm and (25)Mg+(248)Cm) were used to identify the properties of first chance fission of (274)Hs. A Harding-Farley analysis of the fission neutrons emitted in the (25)Mg,26+(248)Cm was performed to identify the prescission and postscission components of the neutron multiplicities in each system. (Γn/Γt) for the first chance fission of (274)Hs (E*=63  MeV) is 0.89±0.13; i.e., ∼90% of the highly excited nuclei survive. The high value of that survival probability is due to dissipative effects during deexcitation. A proper description of the survival probabilities of excited superheavy nuclei formed in hot fusion reactions requires consideration of both dynamic and static (shell-related) effects.