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Title: Two-proton radioactivity studies with {sup 45}Fe and {sup 48}Ni

Abstract

In an experiment at the SISSI/LISE3 facility of GANIL, we have studied the decay of the two proton-rich nuclei {sup 45}Fe and {sup 48}Ni. We identified 30 implantations of {sup 45}Fe and observed for the second time four implantation events of {sup 48}Ni. In 17 cases, {sup 45}Fe decays by two-proton emission with a decay energy of 1.154(16) MeV and a half-life of T{sub 1/2}=1.6{sub -0.3}{sup +0.5} ms. The observation of {sup 48}Ni and of its decay allows us to deduce a half-life of T{sub 1/2}=2.1{sub -0.7}{sup +2.1} ms. One out of four decay events is completely compatible with two-proton radioactivity and may therefore indicate that {sup 48}Ni has a two-proton radioactivity branch. We discuss all information now available on two-proton radioactivity for {sup 45}Fe and {sup 48}Ni and compare it to theoretical models.

Authors:
; ; ; ; ; ;  [1]; ; ; ;  [2];  [2];  [3];  [4];  [5]; ;  [6];  [7];  [8];  [9] more »;  [10] « less
  1. CENBG, Le Haut Vigneau, B.P.120, F-33175 Gradignan Cedex (France)
  2. Grand Accelerateur National d'Ions Lourds, B.P.5027, F-14076 Caen Cedex (France)
  3. (Belgium)
  4. Faculte de Physique, USTHB, B.P.32, El Alia, 16111 Bab Ezzouar, Alger (Algeria)
  5. Institute of Atomic Physics, P.O. Box MG6, Bucharest-Margurele (Romania)
  6. Departamento de Fisica de Particulas, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela (Spain)
  7. Institut de Physique Nucleaire d'Orsay, 15 rue Georges Clemenceau, F-91406 Orsay Cedex (France)
  8. Instituut voor Kern- en Stralingsfysica, Celetijnenlaan 200D, B-3001 Leuven (Belgium)
  9. Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321 (United States)
  10. Flerov Laboratory of Nuclear Reactions, JINR, RU-141980 Dubna (Russian Federation)
Publication Date:
OSTI Identifier:
20699120
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 72; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevC.72.054315; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COMPARATIVE EVALUATIONS; GANIL CYCLOTRON; HALF-LIFE; IRON 45; MEV RANGE; NEUTRON-DEFICIENT ISOTOPES; NICKEL ISOTOPES; PROTON-EMISSION DECAY; PROTONS

Citation Formats

Dossat, C., Bey, A., Blank, B., Canchel, G., Fleury, A., Giovinazzo, J., Matea, I., Santos, F. de Oliveira, Georgiev, G., Grevy, S., Stefan, I., Thomas, J. C., Instituut voor Kern- en Stralingsfysica, Celetijnenlaan 200D, B-3001 Leuven, Adimi, N., Borcea, C., Gil, D. Cortina, Caamano, M., Stanoiu, M., Aksouh, F., Brown, B.A., and Grigorenko, L.V. Two-proton radioactivity studies with {sup 45}Fe and {sup 48}Ni. United States: N. p., 2005. Web. doi:10.1103/PhysRevC.72.054315.
Dossat, C., Bey, A., Blank, B., Canchel, G., Fleury, A., Giovinazzo, J., Matea, I., Santos, F. de Oliveira, Georgiev, G., Grevy, S., Stefan, I., Thomas, J. C., Instituut voor Kern- en Stralingsfysica, Celetijnenlaan 200D, B-3001 Leuven, Adimi, N., Borcea, C., Gil, D. Cortina, Caamano, M., Stanoiu, M., Aksouh, F., Brown, B.A., & Grigorenko, L.V. Two-proton radioactivity studies with {sup 45}Fe and {sup 48}Ni. United States. doi:10.1103/PhysRevC.72.054315.
Dossat, C., Bey, A., Blank, B., Canchel, G., Fleury, A., Giovinazzo, J., Matea, I., Santos, F. de Oliveira, Georgiev, G., Grevy, S., Stefan, I., Thomas, J. C., Instituut voor Kern- en Stralingsfysica, Celetijnenlaan 200D, B-3001 Leuven, Adimi, N., Borcea, C., Gil, D. Cortina, Caamano, M., Stanoiu, M., Aksouh, F., Brown, B.A., and Grigorenko, L.V. Tue . "Two-proton radioactivity studies with {sup 45}Fe and {sup 48}Ni". United States. doi:10.1103/PhysRevC.72.054315.
@article{osti_20699120,
title = {Two-proton radioactivity studies with {sup 45}Fe and {sup 48}Ni},
author = {Dossat, C. and Bey, A. and Blank, B. and Canchel, G. and Fleury, A. and Giovinazzo, J. and Matea, I. and Santos, F. de Oliveira and Georgiev, G. and Grevy, S. and Stefan, I. and Thomas, J. C. and Instituut voor Kern- en Stralingsfysica, Celetijnenlaan 200D, B-3001 Leuven and Adimi, N. and Borcea, C. and Gil, D. Cortina and Caamano, M. and Stanoiu, M. and Aksouh, F. and Brown, B.A. and Grigorenko, L.V.},
abstractNote = {In an experiment at the SISSI/LISE3 facility of GANIL, we have studied the decay of the two proton-rich nuclei {sup 45}Fe and {sup 48}Ni. We identified 30 implantations of {sup 45}Fe and observed for the second time four implantation events of {sup 48}Ni. In 17 cases, {sup 45}Fe decays by two-proton emission with a decay energy of 1.154(16) MeV and a half-life of T{sub 1/2}=1.6{sub -0.3}{sup +0.5} ms. The observation of {sup 48}Ni and of its decay allows us to deduce a half-life of T{sub 1/2}=2.1{sub -0.7}{sup +2.1} ms. One out of four decay events is completely compatible with two-proton radioactivity and may therefore indicate that {sup 48}Ni has a two-proton radioactivity branch. We discuss all information now available on two-proton radioactivity for {sup 45}Fe and {sup 48}Ni and compare it to theoretical models.},
doi = {10.1103/PhysRevC.72.054315},
journal = {Physical Review. C, Nuclear Physics},
number = 5,
volume = 72,
place = {United States},
year = {Tue Nov 01 00:00:00 EST 2005},
month = {Tue Nov 01 00:00:00 EST 2005}
}
  • Cited by 28
  • The decay of the extremely neutron-deficient {sup 48}Ni was studied by means of an imaging time-projection chamber, which allowed the recording of tracks of charged particles. The decays of six atoms were observed. Four of them clearly correspond to two-proton radioactivity, providing the first direct evidence for this decay mode in {sup 48}Ni. Two decays represent {beta}-delayed proton emission. The half-life of {sup 48}Ni is determined to be T{sub 1/2}=2.1{sub -0.4}{sup +1.4} ms.
  • Energy spectra of deuterons from (n, d) reaction on elements belonging to the f7/2 proton shell (Sc/sup 45/, V/sup 51/, Cr/sup 52/, Fe/sup 54/, Fe/sup 56/, Mn/sup 55/, Co/sup 59/, Ni/sup 58/, and Ni/sup 60/) are presented. Deuteron peaks corresponding to the fundamental and some excited levels of the residual nucleus are shown. A comparison is made between relative experimental intensities of ground state transitions, and those predicted on the basis of the shell model hypothesis and the Butler's pick-up mechanism for the (n, d) reaction. (auth)
  • Formation cross sections of product nuclides in the nuclear reactions of enriched isotope targets, /sup 48/Ti, /sup 56/Fe, /sup 57/Fe, /sup 58/Ni, /sup 60/Ni, /sup 63/Cu, and /sup 65/Cu, by 12-GeV protons were measured with the ..gamma..-ray spectroscopy. The measured spallation cross sections were used to obtain the charge-dispersion relation by the least-squares analysis. The present data cover a broader range of the N/Z ratio of the target, (N/Z)/sub T/, from 1.071 to 1.241. The N/Z ratio at the charge-dispersion peak, (N/Z)/sub P/, was found to be consistent with that obtained previously using natural targets in the same mass region.more » The (N/Z)/sub P/ value for /sup 58/Ni was determined to be 1.110 that is appreciably larger than the (N/Z)/sub T/ value of 1.071. This result seems to contradict a simple statistical interpretation of spallation reactions in terms of the nuclear cascade-evaporation process without including nuclear effects of the target nucleus. Cross sections for (p,capture), (p,p..pi../sup +/), and (p,xpyn) reactions were determined unambiguously from the present data. Most of (p,pyn) and (p,2pyn) reactions did not show any noticeable target effect, whereas (p,xpyn) reactions for 3less than or equal toxless than or equal to9 revealed strong target dependence.« less