Three-body model for the two-neutron emission of Be16

Lovell, A. E.; Nunes, F. M.; Thompson, I. J.

doi:10.1103/PhysRevC.95.034605

Title: Three-body model for the two-neutron emission of ${}^{16}{Be}$

Journal Article · Fri Mar 10 00:00:00 EST 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.034605· OSTI ID:1357087

Lovell, A. E. ^[1]; Nunes, F. M. ^[1]; Thompson, I. J. ^[2]

Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. and Dept. of Physics and Astronomy
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

While diproton emission was first theorized in 1960 and first measured in 2002, it was first observed only in 2012. The measurement of ¹⁴Be in coincidence with two neutrons suggests that 16Be does decay through the simultaneous emission of two strongly correlated neutrons. In this study, we construct a full three-body model of ¹⁶Be (as ¹⁴Be + n + n) in order to investigate its configuration in the continuum and, in particular, the structure of its ground state. Here, in order to describe the three-body system, effective n – ¹⁴Be potentials were constructed, constrained by the experimental information on ¹⁵Be. The hyperspherical R-matrix method was used to solve the three-body scattering problem, and the resonance energy of ¹⁶Be was extracted from a phase-shift analysis. As a result, in order to reproduce the experimental resonance energy of ¹⁶Be within this three-body model, a three-body interaction was needed. For extracting the width of the ground state of ¹⁶Be, we use the full width at half maximum of the derivative of the three-body eigenphase shifts and the width of the three-body elastic scattering cross section. In conclusion, our results confirm a dineutron structure for ¹⁶Be, dependent on the internal structure of the subsystem ¹⁵Be.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); National Science Foundation (NSF)

Grant/Contract Number:: NA0002132; AC52-07NA27344; FG52-08NA28552; NA0002135

OSTI ID:: 1357087

Alternate ID(s):: OSTI ID: 1346586; OSTI ID: 1347668

Report Number(s):: LLNL-JRNL-708124; PRVCAN

Journal Information:: Physical Review C, Vol. 95, Issue 3; ISSN 2469-9985

Publisher:: APSCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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