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

Journal Article · · Physical Review C
ORCiD logo [1];  [2];  [3];  [1];  [4];  [5];  [6];  [7];  [8];  [8];  [4];  [9];  [10];  [11];  [11];  [12];  [13];  [3];  [4];  [14] more »;  [6];  [6] « less
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
  2. Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Argonne National Lab. (ANL), Lemont, IL (United States)
  5. Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Chicago, IL (United States)
  6. Univ. of Notre Dame, IN (United States)
  7. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
  8. Argonne National Lab. (ANL), Lemont, IL (United States); Univ. of Maryland, College Park, MD (United States)
  9. Louisiana State Univ., Baton Rouge, LA (United States); Univ. of Notre Dame, IN (United States)
  10. Univ. of Manitoba, Winnipeg (Canada); Argonne National Lab. (ANL), Lemont, IL (United States)
  11. Univ. of California, Berkeley, CA (United States)
  12. Univ. of Notre Dame, IN (United States); Argonne National Lab. (ANL), Lemont, IL (United States)
  13. McGill Univ., Montreal, QC (Canada); Argonne National Lab. (ANL), Lemont, IL (United States)
  14. 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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. 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; PHY-1419765
OSTI ID:
1604280
Alternate ID(s):
OSTI ID: 1601707; OSTI ID: 1761509
Report Number(s):
LLNL-JRNL-760965; PRVCAN; 949573; TRN: US2104204
Journal Information:
Physical Review C, Vol. 101, Issue 2; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

References (55)

Nuclear Data Sheets for A = 135 journal March 2008
Independent Fission Yields and Neutron Emission Probabilities of Short-Lived Halogen Isotopes journal January 1978
r -PROCESS NUCLEOSYNTHESIS IN DYNAMICALLY EJECTED MATTER OF NEUTRON STAR MERGERS journal August 2011
The CARIBU gas catcher journal June 2016
Large β -Delayed Neutron Emission Probabilities in the Ni 78 Region journal April 2009
Half-lives, fission yields and neutron emission probabilities of neutron-rich antimony isotopes journal January 1977
Calculation of delayed-neutron energy spectra in a quasiparticle random-phase approximation–Hauser-Feshbach model journal November 2008
β− Strength function phenomena of exotic nuclei: A critical examination of the significance of nuclear model predictions journal April 1984
The impact of individual nuclear properties on r -process nucleosynthesis journal January 2016
Geant4 developments and applications journal February 2006
Gross properties of delayed neutron emission and β-strength functions journal June 1972
A compact high-resolution isobar separator for the CARIBU project journal October 2008
Delayed-Neutron Branching Ratios of Precursors in the Fission Product Region journal January 1993
Low‐distortion resistive anodes for two‐dimensional position‐sensitive MCP systems journal September 1979
R-process nucleosynthesis in the high-entropy supernova bubble journal November 1992
Synthesis of the Elements in Stars journal October 1957
Half-lives andP n values of delayed-neutron precursors in the mass chains 85?87, 92, 135, 136 and 145 journal March 1978
Delayed neutron precursors—II journal August 1968
Nuclear Reactions in Stars and Nucleogenesis journal June 1957
Recoil effects in allowed beta decay: The elementary particle approach journal October 1974
The Canadian Penning Trap mass spectrometer journal December 2004
An international cooperation to improve delayed neutron data journal July 2002
Delayed neutron emission probabilities of the precursors89,90,91Br and139,140,141I journal December 1980
Advances in studies of nuclei far from stability journal May 1985
The Paul trap: A radiofrequency-quadrupole ion trap for precision studies
  • Scielzo, N. D.; Li, G.; Sternberg, M. G.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 681 https://doi.org/10.1016/j.nima.2012.04.035
journal July 2012
First operation and mass separation with the CARIBU MR-TOF journal June 2016
Recoil-ion charge-state distribution following the β + decay of 21 Na journal August 2003
Delayed-neutron emission from short-lived Br and I isotopes journal August 1974
Nuclear Data Sheets for A = 140 journal July 2007
Charged-Particle and Neutron-Capture Processes in the High-Entropy wind of Core-Collapse Supernovae journal March 2010
The Canadian Penning trap mass spectrometer journal November 1997
Energy spectra of delayed neutrons from separated fission products journal January 1977
Recoil ions from the β decay of Sb 134 confined in a Paul trap journal March 2018
Spectroscopic identification of r-process nucleosynthesis in a double neutron-star merger journal October 2017
Energy spectra of delayed neutrons from separated fission products journal September 1974
Energy spectra of delayed neutrons from separated fission products journal December 1974
β -Delayed Neutron Spectroscopy Using Trapped Radioactive Ions journal February 2013
Radioactive beams from gas catchers: The CARIBU facility journal October 2008
Investigation of beta strength functions by neutron and gamma-ray spectroscopy journal April 1979
The importance of delayed neutrons in nuclear research—A review journal January 1994
Nuclear Data Sheets for A = 136 journal April 2002
Recoil-ion detection efficiency for complex β decays studied using the Beta-decay Paul Trap
  • Munson, J. M.; Siegl, K.; Scielzo, N. D.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 898 https://doi.org/10.1016/j.nima.2018.04.063
journal August 2018
First determination of β -delayed multiple neutron emission beyond A = 100 through direct neutron measurement: The P 2 n value of Sb 136 journal September 2018
Overlapping β decay and resonance neutron spectroscopy of levels in Kr 87 journal August 1983
Geant4—a simulation toolkit
  • Agostinelli, S.; Allison, J.; Amako, K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 506, Issue 3 https://doi.org/10.1016/S0168-9002(03)01368-8
journal July 2003
A Novel Approach to β-delayed Neutron Spectroscopy Using the Beta-decay Paul Trap journal June 2014
Electromagnetic traps for charged and neutral particles journal July 1990
Microchannel plate detectors journal June 1979
Status of delayed-neutron precursor data: half-lives and neutron emission probabilities journal July 2002
Improving systematic predictions of β -delayed neutron emission probabilities journal October 2012
Delayed neutron emission probabilities of gallium, bromine, rubidium, indium, antimony, iodine, and cesium precursors journal September 1980
Charged-Particle and Neutron-Capture Processes in the High-Entropy Wind of Core-Collapse Supernovae text January 2010
R-Process Nucleosynthesis in Dynamically Ejected Matter of Neutron Star Mergers text January 2011
Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger text January 2017
Status of delayed-neutron precursor data: Half-lives and neutron emission probabilities preprint January 2001