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Title: Masses and Beta-Decay Studies of Neutron-Rich Nuclei using the X-Array and Gammasphere

Abstract

Properties of neutron-rich nuclei in the A˜160 region are important for achieving a better understanding of the nuclear structure in this region where little is known owing to diffculties in the production of these nuclei at the present nuclear physics facilities. These properties are essential ingredients in the interpretation of the rareearth peak at A˜160 in the r process abundance distribution, since theoretical models are sensitive to nuclear structure input. Predicated on these ideas, we have initiated a new experimental program at Argonne National Laboratory. During the first experiment, beams from the Californium Rare Isotope Breeder Upgrade radioactive beam facility were used in conjunction with the SATURN decay station and the X-array. We focused initially on several odd-odd nuclei, where β decays of both the ground state and an excited isomer were investigated. Because of the spin difference, a variety of structures in the daughter nuclei were selectively populated and characterized based on their decay properties. Mass measurements using the Canadian Penning Trap aimed at establishing the excitation energy of the β-decaying isomers were also carried out. Evidence was found for a change in the single-particle structure, which in turn results in the formation of a sizable N=98 sub-shell gapmore » at large deformation. Results from the first experimental campaign using the newly-commissioned β-decay station at Gammasphere are also presented.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Nuclear Physics; National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA) - Office of Defense Nuclear Nonproliferation - Nonproliferation and Verification R&D (NA-22)
OSTI Identifier:
1595781
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Conference
Resource Relation:
Conference: 4th International Conference on Nuclear Structure and Dynamics, 05/13/19 - 05/17/19, Venice, IT
Country of Publication:
United States
Language:
English

Citation Formats

Kondev, F. G., Hartley, D. J., Orford, R., Clark, J. A., Savard, G., Auranen, K., Ayangeakaa, A. D., Bottoni, S., Carpenter, M. P., Copp, P., Hoffman, C. R., Lauritsen, T., Seweryniak, D., Stolze, S., Wu, J., Kay, B. P., Orford, R., Li, J., Sethi, J., and Zhu, S. Masses and Beta-Decay Studies of Neutron-Rich Nuclei using the X-Array and Gammasphere. United States: N. p., 2019. Web. doi:10.1051/epjconf/201922301028.
Kondev, F. G., Hartley, D. J., Orford, R., Clark, J. A., Savard, G., Auranen, K., Ayangeakaa, A. D., Bottoni, S., Carpenter, M. P., Copp, P., Hoffman, C. R., Lauritsen, T., Seweryniak, D., Stolze, S., Wu, J., Kay, B. P., Orford, R., Li, J., Sethi, J., & Zhu, S. Masses and Beta-Decay Studies of Neutron-Rich Nuclei using the X-Array and Gammasphere. United States. doi:10.1051/epjconf/201922301028.
Kondev, F. G., Hartley, D. J., Orford, R., Clark, J. A., Savard, G., Auranen, K., Ayangeakaa, A. D., Bottoni, S., Carpenter, M. P., Copp, P., Hoffman, C. R., Lauritsen, T., Seweryniak, D., Stolze, S., Wu, J., Kay, B. P., Orford, R., Li, J., Sethi, J., and Zhu, S. Wed . "Masses and Beta-Decay Studies of Neutron-Rich Nuclei using the X-Array and Gammasphere". United States. doi:10.1051/epjconf/201922301028. https://www.osti.gov/servlets/purl/1595781.
@article{osti_1595781,
title = {Masses and Beta-Decay Studies of Neutron-Rich Nuclei using the X-Array and Gammasphere},
author = {Kondev, F. G. and Hartley, D. J. and Orford, R. and Clark, J. A. and Savard, G. and Auranen, K. and Ayangeakaa, A. D. and Bottoni, S. and Carpenter, M. P. and Copp, P. and Hoffman, C. R. and Lauritsen, T. and Seweryniak, D. and Stolze, S. and Wu, J. and Kay, B. P. and Orford, R. and Li, J. and Sethi, J. and Zhu, S.},
abstractNote = {Properties of neutron-rich nuclei in the A˜160 region are important for achieving a better understanding of the nuclear structure in this region where little is known owing to diffculties in the production of these nuclei at the present nuclear physics facilities. These properties are essential ingredients in the interpretation of the rareearth peak at A˜160 in the r process abundance distribution, since theoretical models are sensitive to nuclear structure input. Predicated on these ideas, we have initiated a new experimental program at Argonne National Laboratory. During the first experiment, beams from the Californium Rare Isotope Breeder Upgrade radioactive beam facility were used in conjunction with the SATURN decay station and the X-array. We focused initially on several odd-odd nuclei, where β decays of both the ground state and an excited isomer were investigated. Because of the spin difference, a variety of structures in the daughter nuclei were selectively populated and characterized based on their decay properties. Mass measurements using the Canadian Penning Trap aimed at establishing the excitation energy of the β-decaying isomers were also carried out. Evidence was found for a change in the single-particle structure, which in turn results in the formation of a sizable N=98 sub-shell gap at large deformation. Results from the first experimental campaign using the newly-commissioned β-decay station at Gammasphere are also presented.},
doi = {10.1051/epjconf/201922301028},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {12}
}

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Works referenced in this record:

Reverse engineering nuclear properties from rare earth abundances in the r process
journal, February 2017

  • Mumpower, M. R.; McLaughlin, G. C.; Surman, R.
  • Journal of Physics G: Nuclear and Particle Physics, Vol. 44, Issue 3
  • DOI: 10.1088/1361-6471/44/3/034003

Masses and β -Decay Spectroscopy of Neutron-Rich Odd-Odd Eu 160 , 162 Nuclei: Evidence for a Subshell Gap with Large Deformation at N = 98
journal, May 2018


Measurement of β−-decay intensity distributions of several fission-product isotopes using a total absorption γ-ray spectrometer
journal, May 1997

  • Greenwood, R. C.; Helmer, R. G.; Putnam, M. H.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 390, Issue 1-2
  • DOI: 10.1016/S0168-9002(97)00356-2

Radioactive beams from gas catchers: The CARIBU facility
journal, October 2008

  • Savard, G.; Baker, S.; Davids, C.
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 266, Issue 19-20
  • DOI: 10.1016/j.nimb.2008.05.091

First operation and mass separation with the CARIBU MR-TOF
journal, June 2016

  • Hirsh, Tsviki Y.; Paul, Nancy; Burkey, Mary
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 376
  • DOI: 10.1016/j.nimb.2015.12.037

First Results from the CARIBU Facility: Mass Measurements on the r -Process Path
journal, August 2013


Phase-Imaging Ion-Cyclotron-Resonance Measurements for Short-Lived Nuclides
journal, February 2013


Nuclear Data Sheets for
journal, July 2005


Nuclear Data Sheets for A = 162
journal, September 2007


The X-Array and SATURN: A new decay-spectroscopy station for CARIBU
journal, November 2014

  • Mitchell, A. J.; Bertone, P. F.; DiGiovine, B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 763
  • DOI: 10.1016/j.nima.2014.06.024

Entry Distribution, Fission Barrier, and Formation Mechanism of N 102 254 o
journal, April 2000


Nuclear Data Sheets for A = 146
journal, September 2016