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Title: Doubly Magic Nucleus {sub 108}{sup 270}Hs{sub 162}

Abstract

Theoretical calculations predict {sup 270}Hs (Z=108, N=162) to be a doubly magic deformed nucleus, decaying mainly by {alpha}-particle emission. In this work, based on a rapid chemical isolation of Hs isotopes produced in the {sup 26}Mg+{sup 248}Cm reaction, we observed 15 genetically linked nuclear decay chains. Four chains were attributed to the new nuclide {sup 270}Hs, which decays by {alpha}-particle emission with Q{sub {alpha}}=9.02{+-}0.03 MeV to {sup 266}Sg which undergoes spontaneous fission with a half-life of 444{sub -148}{sup +444} ms. A production cross section of about 3 pb was measured for {sup 270}Hs. Thus, {sup 270}Hs is the first nucleus for which experimental nuclear decay properties have become available for comparison with theoretical predictions of the N=162 shell stability.

Authors:
; ; ; ; ; ;  [1]; ; ; ; ;  [2]; ; ; ;  [3];  [4];  [5];  [6]; more »;  [7] « less
  1. Technische Universitaet Muenchen, D-85748 Garching (Germany)
  2. Gesellschaft fuer Schwerionenforschung mbH, D-64291 Darmstadt (Germany)
  3. Joint Institute for Nuclear Research, 141980 Dubna (Russian Federation)
  4. Paul Scherrer Institut, CH-5232 Villigen (Switzerland)
  5. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  6. (United States)
  7. Universitaet Mainz, D-55128 Mainz (Germany) (and others)
Publication Date:
OSTI Identifier:
20861474
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Journal Issue: 24; Other Information: DOI: 10.1103/PhysRevLett.97.242501; (c) 2006 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; ALPHA PARTICLES; COLLIDING BEAMS; CROSS SECTIONS; CURIUM 248 TARGET; DEFORMED NUCLEI; EMISSION; HALF-LIFE; HASSIUM 270; MAGIC NUCLEI; MAGNESIUM 26 REACTIONS; MAGNESIUM 26 TARGET; MEV RANGE 01-10; SEABORGIUM 266; SPONTANEOUS FISSION

Citation Formats

Dvorak, J., Kruecken, R., Nebel, F., Novackova, Z., Tuerler, A., Wierczinski, B., Yakushev, A., Bruechle, W., Jaeger, E., Schaedel, M., Schausten, B., Schimpf, E., Chelnokov, M., Gorshkov, V., Kuznetsov, A., Yeremin, A., Dressler, R., Duellmann, Ch. E., University of California, Berkeley, California 94720-1460, Eberhardt, K., and Thoerle, P. Doubly Magic Nucleus {sub 108}{sup 270}Hs{sub 162}. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.97.242501.
Dvorak, J., Kruecken, R., Nebel, F., Novackova, Z., Tuerler, A., Wierczinski, B., Yakushev, A., Bruechle, W., Jaeger, E., Schaedel, M., Schausten, B., Schimpf, E., Chelnokov, M., Gorshkov, V., Kuznetsov, A., Yeremin, A., Dressler, R., Duellmann, Ch. E., University of California, Berkeley, California 94720-1460, Eberhardt, K., & Thoerle, P. Doubly Magic Nucleus {sub 108}{sup 270}Hs{sub 162}. United States. doi:10.1103/PHYSREVLETT.97.242501.
Dvorak, J., Kruecken, R., Nebel, F., Novackova, Z., Tuerler, A., Wierczinski, B., Yakushev, A., Bruechle, W., Jaeger, E., Schaedel, M., Schausten, B., Schimpf, E., Chelnokov, M., Gorshkov, V., Kuznetsov, A., Yeremin, A., Dressler, R., Duellmann, Ch. E., University of California, Berkeley, California 94720-1460, Eberhardt, K., and Thoerle, P. Fri . "Doubly Magic Nucleus {sub 108}{sup 270}Hs{sub 162}". United States. doi:10.1103/PHYSREVLETT.97.242501.
@article{osti_20861474,
title = {Doubly Magic Nucleus {sub 108}{sup 270}Hs{sub 162}},
author = {Dvorak, J. and Kruecken, R. and Nebel, F. and Novackova, Z. and Tuerler, A. and Wierczinski, B. and Yakushev, A. and Bruechle, W. and Jaeger, E. and Schaedel, M. and Schausten, B. and Schimpf, E. and Chelnokov, M. and Gorshkov, V. and Kuznetsov, A. and Yeremin, A. and Dressler, R. and Duellmann, Ch. E. and University of California, Berkeley, California 94720-1460 and Eberhardt, K. and Thoerle, P.},
abstractNote = {Theoretical calculations predict {sup 270}Hs (Z=108, N=162) to be a doubly magic deformed nucleus, decaying mainly by {alpha}-particle emission. In this work, based on a rapid chemical isolation of Hs isotopes produced in the {sup 26}Mg+{sup 248}Cm reaction, we observed 15 genetically linked nuclear decay chains. Four chains were attributed to the new nuclide {sup 270}Hs, which decays by {alpha}-particle emission with Q{sub {alpha}}=9.02{+-}0.03 MeV to {sup 266}Sg which undergoes spontaneous fission with a half-life of 444{sub -148}{sup +444} ms. A production cross section of about 3 pb was measured for {sup 270}Hs. Thus, {sup 270}Hs is the first nucleus for which experimental nuclear decay properties have become available for comparison with theoretical predictions of the N=162 shell stability.},
doi = {10.1103/PHYSREVLETT.97.242501},
journal = {Physical Review Letters},
number = 24,
volume = 97,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}