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Journal of Radioanalytical and Nuclear Chemistry
Authors:
K. Aleklett
,
R. Brandt
,
M. Bronikowski
,
V. Butsev
,
B. Chasteler
,
G. Dersch
,
G. Feige
,
E. Friedlander
,
E. Ganssauge
,
G. Haase
,
J. Herrmann
,
D. Hoffman
,
B. Judek
,
P. Kosma
,
B. Kulakov
,
E. Langrock
,
D. Lee
,
W. Loveland
,
F. Pille
,
N. Porile
,
W. Schulz
, and
G. Seaborg

Abstract  

In recent years the question of the unusual behavior of projectile fragments formed in the interaction of relativistic heavy ions with copper nuclei was studied using nuclear chemistry techniques. As targets we used various copper disk arrangements. It is not the intention of this conference contribution to give a complete account of the entire procedure and its results. However, we want to present a few more recent experimental findings, some of them even in a preliminary form. We want to stimulate the discussion about the entire problem which might be part of the so-called anomalon phenomenon, as observed in the field of relativistic heavy ion interactions with a few other techniques such as nuclear emulsions or bubble chambers.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
J.-S. Wan
,
E.-J. Langrock
,
W. Westmeier
,
P. Vater
,
R. Brandt
,
J. Adam
,
A. Balabekian
,
V. Bamblevski
,
M. Barabanov
,
V. Bradnova
,
P. Chaloun
,
V. Kalinnikov
,
V. Krasnov
,
M. Krivopustov
,
B. Kulakov
,
V. Perelygin
,
V. Pronskikh
,
A. Solnyshkin
,
A. Sosnin
,
V. Stegailov
,
V. Tsoupko-Sitnikov
,
G. Modolo
,
R. Odoj
,
S. Hashemi-Nezhad
, and
M. Zamani-Vallasiadou

Abstract  

Incineration studies of plutonium were carried out at the Synchrophasotron of the Joint Institute for Nuclear Research (JINR), Dubna, using proton beams with energies of 0.53 GeV and 1.0 GeV. Solid lead targets (8 cm in diameter and 20 cm long) were surrounded with 6 cm thick paraffin as neutron moderator and then irradiated. The transmutation of 239 Pu and the associated production of fission products 91 Sr, 92 Sr, 97 Zr, 99 Mo, 103 Ru, 105 Ru, 129 Sb, 132 Te, 133 I, 135 I and 143 Ce were studied in the present work. The plutonium samples (each 449 mg) were placed on the outer surface of moderator. For 1.0 GeV proton beam, the fission rate of 239 Pu is 0.0032 atoms per proton in one gram plutonium samples, for 0.53 GeV proton, this value is 0.0022. The experimental uncertainty is about 15%. The experiments are compared to two theoretical model calculations with moderate success, using the Dubna Cascade Model (CEM) and the LAHET code. The practical incineration rate of 239 Pu is very high. For example: if one uses 10 mA, 1 GeV proton beams under the same (fictive) experimental conditions, the incineration rate of 239 Pu via fission is 3 mg out of the 449 mg sample per day. For 0.53 GeV protons the corresponding rate is 2 mg per day.

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Journal of Radioanalytical and Nuclear Chemistry
Authors:
M. Krivopustov
,
A. Pavliouk
,
A. Kovalenko
,
I. Mariin
,
A. Elishev
,
J. Adam
,
A. Kovalik
,
Yu. Batusov
,
V. Kalinnikov
,
V. Brudanin
,
P. Chaloun
,
V. Tsoupko-Sitnikov
,
A. Solnyshkin
,
V. Stegailov
,
Sh. Gerbish
,
O. Svoboda
,
Z. Dubnicka
,
M. Kala
,
M. Kloc
,
A. Krasa
,
A. Kugler
,
M. Majerle
,
V. Wagner
,
R. Brandt
,
W. Westmeier
,
H. Robotham
,
K. Siemon
,
M. Bielewicz
,
S. Kilim
,
M. Szuta
,
E. Strugalska-Gola
,
A. Wojeciechowski
,
S. Hashemi-Nezhad
,
M. Manolopoulou
,
M. Fragopolou
,
S. Stoulos
,
M. Zamani-Valasiadou
,
S. Jokic
,
K. Katovsky
,
O. Schastny
,
I. Zhuk
,
A. Potapenko
,
A. Safronova
,
Zh. Lukashevich
,
V. Voronko
,
V. Sotnikov
,
V. Sidorenko
,
W. Ensinger
,
H. Severin
,
S. Batsev
,
L. Kostov
,
Kh. Protokhristov
,
Ch. Stoyanov
,
O. Yordanov
,
P. Zhivkov
,
A. Kumar
,
M. Sharma
,
A. Khilmanovich
,
B. Marcinkevich
,
S. Korneev
,
Ts. Damdinsuren
,
Ts. Togoo
, and
H. Kumawat

Abstract  

An extended U/Pb-assembly was irradiated with an extracted beam of 2.52 GeV deuterons from the Nuclotron accelerator of the Laboratory of High Energies within the JINR in Dubna, Russia. The lay-out of this experiment and first results are reported. The Pb-target (diameter 8.4 cm, length 45.6 cm) is surrounded by a natU-blanket (206.4 kg) and used for transmutation studies of hermetically sealed radioactive samples of 129I, 237Np, 238Pu and 239Pu. Estimates of transmutation rates were obtained as result of measurements of gamma-activities of the samples. Information about the spatial and energy distribution of neutrons in the volume of the lead target and the uranium blanket was obtained with sets of activation threshold detectors (Al, Y and Au) and solid state nuclear track detectors (SSNTD). An electronic 3He neutron detector was tested on-line. A comparison of experimental data with theoretical model calculations using the MCNPX program was performed yielding satisfactory results.

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