β-delayed-neutron studies of Sb 135,136 and i 140 performed with trapped ions
B. S. Wang, Lawrence Livermore National Laboratory
S. A. Caldwell, The University of Chicago
N. D. Scielzo, Lawrence Livermore National Laboratory
A. Czeszumska, Lawrence Livermore National Laboratory
J. A. Clark, Argonne National Laboratory
G. Savard, The University of Chicago
A. Aprahamian, University of Notre Dame
M. T. Burkey, Lawrence Livermore National Laboratory
C. J. Chiara, Argonne National Laboratory
J. Harker, Argonne National Laboratory
A. F. Levand, Argonne National Laboratory
S. T. Marley, University of Notre Dame
G. E. Morgan, Argonne National Laboratory
J. M. Munson, University of California, Berkeley
E. B. Norman, University of California, Berkeley
A. Nystrom, Argonne National Laboratory
R. Orford, Argonne National Laboratory
S. W. Padgett, Lawrence Livermore National Laboratory
A. Pérez Galván, Argonne National Laboratory
K. S. Sharma, University of Manitoba
K. Siegl, University of Notre Dame
S. Y. Strauss, University of Notre Dame
Beta-delayed-neutron (βn) spectroscopy was performed using the Beta-decay Paul Trap and an array of radiation detectors. The βn branching ratios and energy spectra for Sb135,136 and I140 were obtained by measuring the time of flight of recoil ions emerging from the trapped ion cloud. These nuclei are located at the edge of an isotopic region identified as having βn branching ratios that impact the r-process abundance pattern around the A≈130 peak. For Sb135,136 and I140, βn branching ratios of 14.6(13)%, 17.6(29)%, and 7.6(28)% were determined, respectively. The βn energy spectra obtained for Sb135 and I140 are compared with results from direct neutron measurements, and the βn energy spectrum for Sb136 has been measured for the first time.
Wang, B., Caldwell, S., Scielzo, N., Czeszumska, A., Clark, J., Savard, G., Aprahamian, A., Burkey, M., Chiara, C., Harker, J., Levand, A., Marley, S., Morgan, G., Munson, J., Norman, E., Nystrom, A., Orford, R., Padgett, S., Pérez Galván, A., Sharma, K., Siegl, K., & Strauss, S. (2020). β-delayed-neutron studies of Sb 135,136 and i 140 performed with trapped ions. Physical Review C, 101 (2) https://doi.org/10.1103/PhysRevC.101.025806