Half-Life of the Doubly Magic r-Process Nucleus N78i

P. T. Hosmer, H. Schatz, A. Aprahamian, O. Arndt, R. R. C. Clement, A. Estrade, K.-L. Kratz, S. N. Liddick, P. F. Mantica, W. F. Mueller, F. Montes, A. C. Morton, M. Ouellette, E. Pellegrini, B. Pfeiffer, P. Reeder, P. Santi, M. Steiner, A. Stolz, B. E. Tomlin, W. B. Walters, and A. Wöhr
Phys. Rev. Lett. 94, 112501 – Published 24 March 2005

Abstract

Nuclei with magic numbers serve as important benchmarks in nuclear theory. In addition, neutron-rich nuclei play an important role in the astrophysical rapid neutron-capture process (r process). N78i is the only doubly magic nucleus that is also an important waiting point in the r process, and serves as a major bottleneck in the synthesis of heavier elements. The half-life of N78i has been experimentally deduced for the first time at the Coupled Cyclotron Facility of the National Superconducting Cyclotron Laboratory at Michigan State University, and was found to be 11060+100ms. In the same experiment, a first half-life was deduced for N77i of 12833+27ms, and more precise half-lives were deduced for N75i and N76i of 34424+20ms and 23818+15ms, respectively.

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  • Received 22 November 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.112501

©2005 American Physical Society

Authors & Affiliations

P. T. Hosmer1,2, H. Schatz1,2,3, A. Aprahamian3,4, O. Arndt5, R. R. C. Clement1,*, A. Estrade1,2, K.-L. Kratz5,6, S. N. Liddick1,7, P. F. Mantica1,7, W. F. Mueller1, F. Montes1,2, A. C. Morton1,†, M. Ouellette1,2, E. Pellegrini1,2, B. Pfeiffer5, P. Reeder8, P. Santi1,‡, M. Steiner1, A. Stolz1, B. E. Tomlin1,7, W. B. Walters9, and A. Wöhr4

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA
  • 4Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556-5670, USA
  • 5Institut für Kernchemie, Universität Mainz, Fritz-Strassmann Weg 2, D-55128 Mainz, Germany
  • 6HGF Virtuelles Institut für Kernstruktur und Nukleare Astrophysik, Mainz, Germany
  • 7Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
  • 8Richland, Washington 99352, USA
  • 9Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA

  • *Current affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue Livermore, CA 94550, USA.
  • Current affiliation: TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 1R9 Canada.
  • Current affiliation: Los Alamos National Laboratory, Safeguards Science and Technology Group (N-1), E540, Los Alamos, NM 87544, USA.

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Vol. 94, Iss. 11 — 25 March 2005

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