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First 𝛽-Delayed Two-Neutron Spectroscopy of the 𝑟-Process Nucleus 134In and Observation of the 𝑖13/2 Single-Particle Neutron State in 133Sn

Journal Article · · Physical Review Letters
DOI:https://doi.org/10.1103/l24v-5m31· OSTI ID:3003798
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  1. University of Tennessee
  2. University of Tokyo
  3. University of Warsaw
  4. Lawrence Livermore National Laboratory
  5. CSIC-Universidad de Valencia
  6. University of York
  7. University of Warsaw; National Centre for Nuclear Research
  8. iThemba LABS
  9. Universidad Complutense de Madrid
  10. CSIC
  11. KU Leuven
  12. Horia Hulubei National Institute for Physics and Nuclear Engineering
  13. University of York; University of Edinburgh
  14. Aarhus University
  15. University of Liverpool
  16. Los Alamos National Lab
  17. STFC Daresbury Laboratory
  18. Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH)
  19. CERN
  20. University of the Western Cape
  21. University of Jyväskylä; University of Helsinki
  22. University of Tennessee; Universidad Complutense de Madrid; Warsaw University
  23. University of Surrey
  24. Tennessee Technological University
  25. Institut Laue-Langevin; University of Jyväskylä
  26. Universität zu Köln
+ Show Author Affiliations
This manuscript reports on the direct observation of a 𝛽-delayed two-neutron emission in a study of 134In at the ISOLDE Decay Station using neutron spectroscopy. We also report on the first measurement in 𝛽− decay of the long-sought 13/2+ excited state in 133Sn, attributed to be the neutron single-particle 𝑖13/2 orbital. The observation of sequential neutron emission is used to extract the relative population of the 𝑖13/2 state, which was found to be much smaller than the predictions of the statistical model. The experiment was possible because of the innovative use of a neutron array with neutron discrimination and interaction tracking capabilities. This is the first study of the details of the two-neutron emission for a nucleus, which belongs to the 𝑟-process path. Understanding 𝛽-delayed two-neutron emission probabilities is essential to validate models used in astrophysical 𝑟-process nucleosynthesis calculations. Observing two-neutron emissions in 𝛽− decay paves the way for new experiments to study energy and angular correlations for 𝛽-delayed multineutron emitters.
Research Organization:
The University of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
IDS Collaboration
Grant/Contract Number:
89233218CNA000001; AC05-00OR22725; AC52-07NA27344; FG02-96ER40983; NA0002132; NA0004068
OSTI ID:
3003798
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 135; ISSN 0031-9007; ISSN 1079-7114
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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