Attosecond time delays in heavy-ion induced fission measured by crystal blocking

J. U. Andersen; J. Chevallier; J. S. Forster; S. A. Karamian; C. R. Vane; J. R. Beene; A. Galindo-Uribarri; J. Gomez Del Campo; C. J. Gross; H. F. Krause; E. Padilla-Rodal; D. Radford; D. Shapira; C. Broude; F. Malaguti; A. Uguzzoni

doi:10.1103/PhysRevC.78.064609

Attosecond time delays in heavy-ion induced fission measured by crystal blocking

J. U. Andersen, J. Chevallier, J. S. Forster, S. A. Karamian, C. R. Vane, J. R. Beene, A. Galindo-Uribarri, J. Gomez Del Campo, C. J. Gross, H. F. Krause, E. Padilla-Rodal, D. Radford, D. Shapira, C. Broude, F. Malaguti, A. Uguzzoni

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

The time delays in fission induced by bombardment of W with 180 MeV S32, 240-255 MeV Ti48, 330-375 MeV Ni58, and 390 MeV Ge74 have been measured by observation of crystal blocking. Nearly all results are consistent with exponential decay with lifetimes of order 10-18 s which depend weakly on the atomic number of the composite nucleus. This is inconsistent with the Bohr-Wheeler model of fission from a compound nucleus in statistical equilibrium at each stage in a neutron evaporation cascade and supports a picture of strongly damped quasifission. A simple diffusion model with one-body dissipation reproduces roughly the observed time scale and the exponential decay. It suggests that the outer fission barrier could play a significant role in the observed, very slow decays.

Original language	English
Article number	064609
Journal	Physical Review C - Nuclear Physics
Volume	78
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.78.064609
State	Published - Dec 1 2008

Access to Document

10.1103/PhysRevC.78.064609

Cite this

Andersen, J. U., Chevallier, J., Forster, J. S., Karamian, S. A., Vane, C. R., Beene, J. R., Galindo-Uribarri, A., Del Campo, J. G., Gross, C. J., Krause, H. F., Padilla-Rodal, E., Radford, D., Shapira, D., Broude, C., Malaguti, F., & Uguzzoni, A. (2008). Attosecond time delays in heavy-ion induced fission measured by crystal blocking. Physical Review C - Nuclear Physics, 78(6), Article 064609. https://doi.org/10.1103/PhysRevC.78.064609

@article{2a903453ef8e4ba2bb6c089f1deebd08,

title = "Attosecond time delays in heavy-ion induced fission measured by crystal blocking",

abstract = "The time delays in fission induced by bombardment of W with 180 MeV S32, 240-255 MeV Ti48, 330-375 MeV Ni58, and 390 MeV Ge74 have been measured by observation of crystal blocking. Nearly all results are consistent with exponential decay with lifetimes of order 10-18 s which depend weakly on the atomic number of the composite nucleus. This is inconsistent with the Bohr-Wheeler model of fission from a compound nucleus in statistical equilibrium at each stage in a neutron evaporation cascade and supports a picture of strongly damped quasifission. A simple diffusion model with one-body dissipation reproduces roughly the observed time scale and the exponential decay. It suggests that the outer fission barrier could play a significant role in the observed, very slow decays.",

author = "Andersen, {J. U.} and J. Chevallier and Forster, {J. S.} and Karamian, {S. A.} and Vane, {C. R.} and Beene, {J. R.} and A. Galindo-Uribarri and {Del Campo}, {J. Gomez} and Gross, {C. J.} and Krause, {H. F.} and E. Padilla-Rodal and D. Radford and D. Shapira and C. Broude and F. Malaguti and A. Uguzzoni",

year = "2008",

month = dec,

day = "1",

doi = "10.1103/PhysRevC.78.064609",

language = "English",

volume = "78",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

number = "6",

}

Andersen, JU, Chevallier, J, Forster, JS, Karamian, SA, Vane, CR, Beene, JR, Galindo-Uribarri, A, Del Campo, JG, Gross, CJ, Krause, HF, Padilla-Rodal, E, Radford, D, Shapira, D, Broude, C, Malaguti, F & Uguzzoni, A 2008, 'Attosecond time delays in heavy-ion induced fission measured by crystal blocking', Physical Review C - Nuclear Physics, vol. 78, no. 6, 064609. https://doi.org/10.1103/PhysRevC.78.064609

TY - JOUR

T1 - Attosecond time delays in heavy-ion induced fission measured by crystal blocking

AU - Andersen, J. U.

AU - Chevallier, J.

AU - Forster, J. S.

AU - Karamian, S. A.

AU - Vane, C. R.

AU - Beene, J. R.

AU - Galindo-Uribarri, A.

AU - Del Campo, J. Gomez

AU - Gross, C. J.

AU - Krause, H. F.

AU - Padilla-Rodal, E.

AU - Radford, D.

AU - Shapira, D.

AU - Broude, C.

AU - Malaguti, F.

AU - Uguzzoni, A.

PY - 2008/12/1

Y1 - 2008/12/1

N2 - The time delays in fission induced by bombardment of W with 180 MeV S32, 240-255 MeV Ti48, 330-375 MeV Ni58, and 390 MeV Ge74 have been measured by observation of crystal blocking. Nearly all results are consistent with exponential decay with lifetimes of order 10-18 s which depend weakly on the atomic number of the composite nucleus. This is inconsistent with the Bohr-Wheeler model of fission from a compound nucleus in statistical equilibrium at each stage in a neutron evaporation cascade and supports a picture of strongly damped quasifission. A simple diffusion model with one-body dissipation reproduces roughly the observed time scale and the exponential decay. It suggests that the outer fission barrier could play a significant role in the observed, very slow decays.

AB - The time delays in fission induced by bombardment of W with 180 MeV S32, 240-255 MeV Ti48, 330-375 MeV Ni58, and 390 MeV Ge74 have been measured by observation of crystal blocking. Nearly all results are consistent with exponential decay with lifetimes of order 10-18 s which depend weakly on the atomic number of the composite nucleus. This is inconsistent with the Bohr-Wheeler model of fission from a compound nucleus in statistical equilibrium at each stage in a neutron evaporation cascade and supports a picture of strongly damped quasifission. A simple diffusion model with one-body dissipation reproduces roughly the observed time scale and the exponential decay. It suggests that the outer fission barrier could play a significant role in the observed, very slow decays.

UR - http://www.scopus.com/inward/record.url?scp=58049091496&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.78.064609

DO - 10.1103/PhysRevC.78.064609

M3 - Article

AN - SCOPUS:58049091496

SN - 0556-2813

VL - 78

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 6

M1 - 064609

ER -

Attosecond time delays in heavy-ion induced fission measured by crystal blocking

Abstract

Access to Document

Other files and links

Fingerprint

Cite this