$β$-delayed-neutron studies of 135,136Sb and 140I performed with trapped ions

Wang, B. S.; Caldwell, S. A.; Scielzo, N. D.; Czeszumska, A.; Clark, J. A.; Savard, G.; Aprahamian, A.; Burkey, M. T.; Chiara, C. J.; Harker, J.; Levand, A. F.; Marley, S. T.; Morgan, G. E.; Munson, J. M.; Norman, E. B.; Nystrom, A.; Orford, R.; Padgett, S. W.; Pérez Galván, A.; Sharma, K. S.; Siegl, K.; Strauss, S. Y.

doi:10.1103/PhysRevC.101.025806

Title: $$β$$-delayed-neutron studies of ^135,136Sb and ¹⁴⁰I performed with trapped ions

Journal Article · 23 February 2020 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.101.025806 · OSTI ID:1604280

^[1]; Caldwell, S. A. ^[2]; Scielzo, N. D. ^[3]; Czeszumska, A. ^[1]; Clark, J. A. ^[4]; Savard, G. ^[5]; Aprahamian, A. ^[6]; Burkey, M. T. ^[7]; Chiara, C. J. ^[8]; Harker, J. ^[8]; Levand, A. F. ^[4]; Marley, S. T. ^[9]; Morgan, G. E. ^[10]; Munson, J. M. ^[11]; Norman, E. B. ^[11]; Nystrom, A. ^[12]; Orford, R. ^[13]; Padgett, S. W. ^[3]; Pérez Galván, A. ^[4]; Sharma, K. S. ^[14] more »

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Chicago, IL (United States)
Univ. of Notre Dame, IN (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Maryland, College Park, MD (United States)
Louisiana State Univ., Baton Rouge, LA (United States); Univ. of Notre Dame, IN (United States)
Univ. of Manitoba, Winnipeg (Canada); Argonne National Lab. (ANL), Lemont, IL (United States)
Univ. of California, Berkeley, CA (United States)
Univ. of Notre Dame, IN (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
McGill Univ., Montreal, QC (Canada); Argonne National Lab. (ANL), Lemont, IL (United States)
Univ. of Manitoba, Winnipeg (Canada)

In this work, 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 ^135,136Sb and ¹⁴⁰I 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 ^135,136Sb and ¹⁴⁰I, $βn$ branching ratios of 14.6(13)%, 17.6(29)%, and 7.6(28)% were determined, respectively. The $βn$ energy spectra obtained for ¹³⁵Sb and ¹⁴⁰I are compared with results from direct neutron measurements, and the $βn$ energy spectrum for ¹³⁶Sb has been measured for the first time.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); University of Maryland, College Park, MD (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP); Louisiana State Board of Regents; Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation (NSF); US Department of Homeland Security (DHS)

Grant/Contract Number:: AC52-07NA27344; NA0000979; NA0002135; AC02-06CH11357; FG02-94ER40834

OSTI ID:: 1604280

Report Number(s):: LLNL-JRNL--760965; 949573

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 101; ISSN 2469-9985; ISSN PRVCAN

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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