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Journal Articles

Fission-barrier heights of neutron-deficient mercury nuclei

Veselsk$'y$, M.*; Andreyev, A. N.*; Antalic, S.*; Huyse, M.*; M$"o$ller, P.*; Nishio, Katsuhisa; Sierk, A. J.*; Van Duppen, P.*; Venhart, M.*

Physical Review C, 86(2), p.024308_1 - 024308_8, 2012/08

 Times Cited Count:14 Percentile:63.47(Physics, Nuclear)

Journal Articles

Contrasting fission potential-energy structure of actinides and mercury isotopes

Ichikawa, Takatoshi*; Iwamoto, Akira; M$"o$ller, P.*; Sierk, A. J.*

Physical Review C, 86(2), p.024610_1 - 024610_8, 2012/08

 Times Cited Count:58 Percentile:93.9(Physics, Nuclear)

Fission-fragment mass distributions are asymmetric in fission of typical actinide nuclei for nucelon number $$A$$ in the range $$228 le A le 258$$ and proton number $$Z$$ in the range $$90 le 100$$. For somewhat lighter systems it has been observed that fission mass distributions are usually symmetric. However, a recent experiment showed that fission of $$^{198}$$Hg following electron capture on $$^{180}$$HI is asymmetric. An earlier experiment has shown fission of $$^{198}$$Hg and nearby nuclei is symmetric, but with hints of asymmetric yield distributions up to about 10 MeV above the saddle-point energy. We calculate potential-energy surfaces for a typical actinide nucleus and for 12 even isotopes in the range $$^{178}$$Hg-$$^{200}$$Hg, demonstrating the radical differences between actinide and mervury potential surfaces. We discuss these differences and how the changing potential-energy structure along the mercury isotope chain affects the observed (a)symmetry of the fission fragments. We show that the mechanism of asymmetric fission is very different in proton-rich mercury isotopes compared to the actinide region.

Journal Articles

New type of asymmetric fission in proton-rich nuclei

Andreyev, A. N.*; Elseviers, J.*; Huyse, M.*; Van Duppen, P.*; Antalic, S.*; Barzakh, A.*; Bree, N.*; Cocolios, T. E.*; Comas, V. F.*; Diriken, J.*; et al.

Physical Review Letters, 105(25), p.252502_1 - 252502_5, 2010/12

 Times Cited Count:166 Percentile:97.14(Physics, Multidisciplinary)

Journal Articles

Barrier for cold-fusion production of superheavy elements

Ichikawa, Takatoshi; Iwamoto, Akira; M$"o$ller, P.*; Sierk, A. J.*

Physical Review C, 71(4), p.044608_1 - 044608_11, 2005/04

 Times Cited Count:41 Percentile:90.1(Physics, Nuclear)

We estimate the effective fusion barrier in the entrance channel in cold-fusion reactions in a model where the projectile deformation and quadrupole zero-point vibrational energy are taken into account. The effective fusion-barrier height is defined as the barrier energy at the target and projectile separation distance where the system becomes unstable with respect to projectile deformation. We also calculate five-dimensional potential-energy surfaces for the single compound system. For heavy systems the fusion barrier at touching becomes lower than the fission barrier just beyond the ground state of the compound system. Except for reactions in which the projectile is doubly magic or near doubly magic, the calculated quantities are consistent with the observed optimal energies for evaporation-residue formation.

Journal Articles

Cluster expression in fission and fusion in high-dimensional macroscopic-microscopic calculations

Iwamoto, Akira; Ichikawa, Takatoshi; M$"o$ller, P.*; Sierk, A. J.*

Nuclear Physics A, 738, p.499 - 502, 2004/06

 Times Cited Count:4 Percentile:31.8(Physics, Nuclear)

no abstracts in English

Journal Articles

Five-dimensional fission-barrier calculations from $$^{70}$$Se to $$^{252}$$Cf

M$"o$ller, P.*; Sierk, A. J.*; Iwamoto, Akira

Physical Review Letters, 92(7), p.072501_1 - 072501_4, 2004/02

 Times Cited Count:150 Percentile:95.77(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Nuclear fission modes and fragment mass asymmetries in a five-dimensional deformation space

M$"o$ller, P.*; Madland, D. G.*; Sierk, A. J.*; Iwamoto, Akira

Nature, 409(6822), p.785 - 789, 2001/02

 Times Cited Count:272 Percentile:99.31(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Fission mass division and topology of potential energy surface

Iwamoto, Akira; M$"o$ller, P.*; Madland, D. G.*; Sierk, A. J.*

AIP Conference Proceedings 597, p.243 - 248, 2001/00

We present calculations of fission potential energy surface based on Strutinsky's prescription for realistic shape parameterization of the fissioning nuclei. It involves 5 shape parameters from which we obtain 5-dimensional potential energy surface of more than 2.5 million points. The analysis of the saddle point was performed without any approximation and we obtained the following understanding of the fission process. (1) Most of the actinide nuclei have the lowest two saddle points, one is mass-symmetric and the other is mass-asymmetric. (2) The relative height of these two saddles depends on the fissioning nucleus and experimentally observed mass division mode was well understood from the properties of the lowest saddle point. (3) Bimodal feature of Fm isotopes was well understood from the analysis of the saddle points. (4) Degree of the mass asymmetry of the most probable mass division was well understood from the potential energy surface.

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