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Title: Two-Proton Correlations in the Decay of 45Fe

Abstract

The decay of extremely neutron deficient 45Fe has been studied in detail by means of a novel type of a gaseous detector employing digital imaging to record tracks of charged particles. The two-proton radioactivity channel was clearly identified. For the first time, the angular and energy correlations between two protons emitted from the nuclear ground state were determined, indicating the genuine three-body character of this decay. The half-life of 45Fe was found to be 2.6 +/- 0.2 ms and the observed 2p decay branching ratio is 70 +/- 4%.

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [1];  [1];  [3];  [1];  [4];  [3];  [1];  [1];  [1];  [3];  [3];  [5];  [4]
  1. University of Warsaw
  2. Joint Institute for Nuclear Research, Dubna, Russia
  3. University of Tennessee, Knoxville (UTK)
  4. Michigan State University, East Lansing
  5. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Other RIB Facility
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931078
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 99; Journal Issue: 19
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BRANCHING RATIO; CHARGED PARTICLES; DECAY; GROUND STATES; HALF-LIFE; NEUTRONS; PROTONS; RADIOACTIVITY; IRON 45

Citation Formats

Miernik, K., Dominik, W., Janas, Z., Pfutzner, M., Grigorenko, L., Bingham, C. R., Czyrkowski, H., Wiok, M., Darby, Iain, Djbrowski, R., Ginter, T. N., Grzywacz, R., Karny, M., Korgul, A., Kusmierz, W., Liddick, Sean, Rajabali, Mustafa, Rykaczewski, Krzysztof Piotr, and Stolz, A. Two-Proton Correlations in the Decay of 45Fe. United States: N. p., 2007. Web. doi:10.1103/PhysRevLett.99.192501.
Miernik, K., Dominik, W., Janas, Z., Pfutzner, M., Grigorenko, L., Bingham, C. R., Czyrkowski, H., Wiok, M., Darby, Iain, Djbrowski, R., Ginter, T. N., Grzywacz, R., Karny, M., Korgul, A., Kusmierz, W., Liddick, Sean, Rajabali, Mustafa, Rykaczewski, Krzysztof Piotr, & Stolz, A. Two-Proton Correlations in the Decay of 45Fe. United States. doi:10.1103/PhysRevLett.99.192501.
Miernik, K., Dominik, W., Janas, Z., Pfutzner, M., Grigorenko, L., Bingham, C. R., Czyrkowski, H., Wiok, M., Darby, Iain, Djbrowski, R., Ginter, T. N., Grzywacz, R., Karny, M., Korgul, A., Kusmierz, W., Liddick, Sean, Rajabali, Mustafa, Rykaczewski, Krzysztof Piotr, and Stolz, A. Mon . "Two-Proton Correlations in the Decay of 45Fe". United States. doi:10.1103/PhysRevLett.99.192501.
@article{osti_931078,
title = {Two-Proton Correlations in the Decay of 45Fe},
author = {Miernik, K. and Dominik, W. and Janas, Z. and Pfutzner, M. and Grigorenko, L. and Bingham, C. R. and Czyrkowski, H. and Wiok, M. and Darby, Iain and Djbrowski, R. and Ginter, T. N. and Grzywacz, R. and Karny, M. and Korgul, A. and Kusmierz, W. and Liddick, Sean and Rajabali, Mustafa and Rykaczewski, Krzysztof Piotr and Stolz, A.},
abstractNote = {The decay of extremely neutron deficient 45Fe has been studied in detail by means of a novel type of a gaseous detector employing digital imaging to record tracks of charged particles. The two-proton radioactivity channel was clearly identified. For the first time, the angular and energy correlations between two protons emitted from the nuclear ground state were determined, indicating the genuine three-body character of this decay. The half-life of 45Fe was found to be 2.6 +/- 0.2 ms and the observed 2p decay branching ratio is 70 +/- 4%.},
doi = {10.1103/PhysRevLett.99.192501},
journal = {Physical Review Letters},
number = 19,
volume = 99,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • The decay of extremely neutron-deficient {sup 45}Fe has been studied in detail by means of a novel type of a gaseous detector employing digital imaging to record tracks of charged particles. The two-proton radioactivity channel was clearly identified. For the first time, the angular and energy correlations between two protons emitted from the nuclear ground state were determined, indicating the genuine three-body character of this decay. The half-life of {sup 45}Fe was found to be 2.6{+-}0.2 ms and the observed 2p decay branching ratio is 70{+-}4%.
  • Proton emission from a long-lived source is predicted to leach a difference between the longitudinal and transverse correlation function. We present the first clear observation of this signature of finite sold lifetime in two-proton correlation functions which allows independent determination of the spatial and temporal extent of the phase-space distribution. Extracted lifetimes are consistent with predictions from dynamical model for the Ar+Sc data and with statistical models for to Xe+Al data. The importance of clear source frame identification is stressing.
  • Proton-proton correlations were observed for the two-proton decays of the ground states of {sup 19}Mg and {sup 16}Ne. The trajectories of the respective decay products, {sup 17}Ne+p+p and {sup 14}O+p+p, were measured by using a tracking technique with microstrip detectors. These data were used to reconstruct the angular correlations of fragments projected on planes transverse to the precursor momenta. The measured three-particle correlations reflect a genuine three-body decay mechanism and allowed us to obtain spectroscopic information on the precursors with valence protons in the sd shell.
  • 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-protonmore » 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.« less