Heavy ion radioactivities, cold fission and alpha decay in a unified approach

At RIKEN (The Institute of Physical and Chemical Research) in Japan, we have performed experiments to study the productions and decays of the heaviest elements produced by one neutron emission channels of 208 Pb and 209 Bi based heavy-ion induced fusion reactions. A gas-filled type recoil separator has been used for collecting evaporation residues of the reactions separating them from high intensity beam particles. The reactions studied were 208 Pb (58 Fe , n )265 Hs , 208 Pb (64 Ni , n ) 271 Ds , 209 Bi (64 Ni , n ) 272 Rg , 208 Pb (70 Zn , n ) 277112, and 209 Bi (70 Zn , n ) 278113. In studies of the first four reactions we have provided the independent confirmations of the productions and their decays of the isotopes, 265 Hs , 271 Ds , 272 Rg , and 277112, as well as the decay properties of their decay daughters, previously studied by Hofmann et al., a group of Gesellschaft für Schwerionenforschung (GSI), Germany. In the last reaction, we observed two decay chains originated from the isotope 278113, assigned firstly by generic correlation of the alpha decay chains connected into the previously known decay of 266 Bh and 262 Db via previously unknown alpha decays of 278113, 274 Rg and 270 Mt .

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From symmetric cold fission fragment mass distributions to extremely asymmetric alpha decay

10.1063/1.36964 ◽

1987 ◽

Author(s):

D. N. Poenaru ◽

M. Ivascu ◽

J. A. Maruhn ◽

W. Greiner

Keyword(s):

Fission Fragment ◽

Alpha Decay ◽

Fragment Mass ◽

Mass Distributions ◽

Cold Fission

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Unified approach to alpha decay calculations

Pramana ◽

10.1007/s12043-014-0740-7 ◽

2014 ◽

Vol 82 (5) ◽

pp. 867-878 ◽

Cited By ~ 1

Author(s):

C S SHASTRY ◽

S MAHADEVAN ◽

K ADITYA

Keyword(s):

Alpha Decay ◽

Unified Approach

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PRESCOLD: Calculation of the half-life for alpha decay, cluster radioactivity and cold fission processes

Computer Physics Communications ◽

10.1016/s0010-4655(97)00118-5 ◽

1997 ◽

Vol 107 (1-3) ◽

pp. 246-252 ◽

Cited By ~ 16

Author(s):

M. Gonçalves ◽

S.B. Duarte ◽

F. Garcia ◽

O. Rodriguez

Keyword(s):

Half Life ◽

Alpha Decay ◽

Cluster Radioactivity ◽

Cold Fission

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Axial Observation of X-Ray Spectra from a Beam-Foil Source

International Astronomical Union Colloquium ◽

10.1017/s0252921100108048 ◽

1988 ◽

Vol 102 ◽

pp. 339-342

Author(s):

J.M. Laming ◽

J.D. Silver ◽

R. Barnsley ◽

J. Dunn ◽

K.D. Evans ◽

...

Keyword(s):

Spectral Resolution ◽

Heavy Ion ◽

Ion Beams ◽

Beam Axis ◽

Doppler Broadening ◽

X Ray ◽

Beam Foil

AbstractNew observations of x-ray spectra from foil-excited heavy ion beams are reported. By observing the target in a direction along the beam axis, an improvement in spectral resolution, δλ/λ, by about a factor of two is achieved, due to the reduced Doppler broadening in this geometry.

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Void-Lattice Formation in Natural Fluorite by Electron Irradiation

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100093031 ◽

1976 ◽

Vol 34 ◽

pp. 614-615 ◽

Cited By ~ 1

Author(s):

L.E. Murr

Keyword(s):

Electron Microscope ◽

Electron Irradiation ◽

Heavy Ion ◽

High Energy ◽

Stoichiometric Ratio ◽

Direct Observations ◽

Transmission Electron ◽

Anion Vacancies ◽

Cation And Anion Vacancies ◽

Lattice Formation

The production of void lattices in metals as a result of displacement damage associated with high energy and heavy ion bombardment is now well documented. More recently, Murr has shown that a void lattice can be developed in natural (colored) fluorites observed in the transmission electron microscope. These were the first observations of a void lattice in an irradiated nonmetal, and the first, direct observations of color-center aggregates. Clinard, et al. have also recently observed a void lattice (described as a high density of aligned "pores") in neutron irradiated Al2O3 and Y2O3. In this latter work, itwas pointed out that in order that a cavity be formed,a near-stoichiometric ratio of cation and anion vacancies must aggregate. It was reasoned that two other alternatives to explain the pores were cation metal colloids and highpressure anion gas bubbles.Evans has proposed that void lattices result from the presence of a pre-existing impurity lattice, and predicted that the formation of a void lattice should restrict swelling in irradiated materials because it represents a state of saturation.

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Electron and ion irradiation-induced dissolution of mechanical twins in the intermetalic U3Si: An in situ HVEM study

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100155232 ◽

1989 ◽

Vol 47 ◽

pp. 652-653

Author(s):

Charles W. Allen ◽

Robert C. Birtcher

Keyword(s):

Elevated Temperatures ◽

Ion Irradiation ◽

Ion Beam ◽

National Laboratory ◽

Argonne National Laboratory ◽

Heavy Ion ◽

High Energy ◽

Mechanical Twinning ◽

In Situ Experiments

The uranium silicides, including U3Si, are under study as candidate low enrichment nuclear fuels. Ion beam simulations of the in-reactor behavior of such materials are performed because a similar damage structure can be produced in hours by energetic heavy ions which requires years in actual reactor tests. This contribution treats one aspect of the microstructural behavior of U3Si under high energy electron irradiation and low dose energetic heavy ion irradiation and is based on in situ experiments, performed at the HVEM-Tandem User Facility at Argonne National Laboratory. This Facility interfaces a 2 MV Tandem ion accelerator and a 0.6 MV ion implanter to a 1.2 MeV AEI high voltage electron microscope, which allows a wide variety of in situ ion beam experiments to be performed with simultaneous irradiation and electron microscopy or diffraction.At elevated temperatures, U3Si exhibits the ordered AuCu3 structure. On cooling below 1058 K, the intermetallic transforms, evidently martensitically, to a body-centered tetragonal structure (alternatively, the structure may be described as face-centered tetragonal, which would be fcc except for a 1 pet tetragonal distortion). Mechanical twinning accompanies the transformation; however, diferences between electron diffraction patterns from twinned and non-twinned martensite plates could not be distinguished.

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