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Title: β -decay half-lives and β -delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N = 126

Abstract

Background: There have been measurements on roughly 230 nuclei that are β-delayed neutron emitters. They range from 8He up to 150La . Apart from 210Tl, with a branching ratio of only 0.007%, no other neutron emitter has been measured beyond A = 150 . Therefore, new data are needed, particularly in the region of heavy nuclei around N = 126 , in order to guide theoretical models and help understand the formation of the third r-process peak at A ~ 195. Purpose: To measure both β-decay half-lives and neutron branching ratios of several neutron-rich Au, Hg, Tl, Pb, and Bi isotopes beyond N = 126 . Method: Ions of interest were produced by fragmentation of a 238U beam, selected and identified via the GSI-FRS fragment separator. A stack of segmented silicon detectors (SIMBA) was used to measure ion implants and β decays. An array of 30 3He tubes embedded in a polyethylene matrix (BELEN) was used to detect neutrons with high efficiency and selectivity. A self-triggered digital system is employed to acquire data and to enable time correlations. The latter were analyzed with an analytical model and results for the half-lives and neutron-branching ratios were derived by using the binnedmore » maximum-likelihood method. Results: Twenty new β-decay half-lives are reported for 204-206Au, 208 – 211Hg, 211 – 216Tl , 215 – 218Pb, and 218 – 220Bi, nine of them for the first time. Neutron emission probabilities are reported for 210, 211Hg and 211 – 216Tl . Conclusions: The new β-decay half-lives are in good agreement with previous measurements on nuclei in this region. Lastly, the measured neutron emission probabilities are comparable to or smaller than values predicted by global models such as relativistic Hartree Bogoliubov plus the relativistic quasi-particle random phase approximation (RHB + RQRPA).« less

Authors:
 [1];  [2];  [2];  [3];  [4];  [5];  [5];  [6];  [7];  [8];  [7];  [9];  [10];  [11];  [12];  [13];  [4];  [14];  [8];  [12] more »;  [6];  [13];  [7];  [15];  [4];  [13];  [4];  [4];  [4];  [4];  [4];  [13];  [16];  [12];  [8];  [17];  [4];  [18];  [4];  [5];  [4];  [6];  [4];  [6];  [7];  [2];  [4];  [12];  [19];  [20];  [13];  [4];  [2];  [4];  [21];  [4];  [6];  [4];  [6];  [9];  [20] « less
  1. Univ. Politecnica de Catalunya (Spain); TRIUMF, Vancouver, BC (Canada)
  2. Univ. de Valencia (Spain)
  3. Univ. de Valencia (Spain); Hungarian Academy of Sciences, Budapest (Hungary). Inst. of Nuclear Research
  4. GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany)
  5. Univ. de Santiago de Compostela (Spain)
  6. Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
  7. Univ. Politecnica de Catalunya (Spain)
  8. Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
  9. Univ. of Edinburgh, Scotland (United Kingdom)
  10. TRIUMF, Vancouver, BC (Canada); GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany); Justus-Liebig-Universitat Giessen, Giessen (Germany)
  11. GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany); St. Mary's Univ., Halifax, Nova Scotia (Canada)
  12. GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany); Justus-Liebig-Universitat Giessen, Giessen (Germany)
  13. Technische Univ. Munchen, Garching (Germany). Dept. Physik
  14. Univ. de Lisboa, Lisboa (Portugal). Centro de Física Nuclear
  15. European Organization for Nuclear Research (CERN), Geneva (Switzerland). Physics Dept.; Univ. de Sevilla, Sevilla (Spain)
  16. ExtreMe Mater Inst., Darmstadt (Germany)
  17. Michigan State Univ., East Lansing, MI (United States); Univ. of Notre Dame, IN (United States). Joint Inst. for Nuclear Astrophysics
  18. Istituto Nazionale di Fisica Nucleare (INFN), Legnaro (Italy). Laboratori Nazionale di Legnaro
  19. GSI Helmholtzzentrum fur Schwerionenforschung GmbH, Darmstadt (Germany); Michigan State Univ., East Lansing, MI (United States); Univ. of Notre Dame, IN (United States). Joint Inst. for Nuclear Astrophysics; Univ. of Notre Dame, IN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  20. Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation). Flerov Lab.
  21. Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation). Flerov Lab.; Inst. de Physique Nucleaire d'Orsay, Orsay (France)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; Spanish Ministerio de Economia y Competitividad; Spanish Nuclear Security Council (CSN); Science and Technology Facilities Council (STFC) (United Kingdom); National Research Council of Canada (NSERC); German Helmholtz Association; German Federal Ministry of Education and Research (BMBF)
OSTI Identifier:
1432625
Report Number(s):
LA-UR-17-30597
Journal ID: ISSN 2469-9985; PRVCAN; TRN: US1802942
Grant/Contract Number:  
AC52-06NA25396; FPA2011-28770-C03-03; FPA2008-04972-C03-03; AIC-D-2011-0705; FPA2011-24553; FPA2008-6419; FPA2010-17142; FPA2014-52823-C2-1-P; FPA2014-52823-C2-2-P; CPAN CSD-2007-00042; VH-NG 627; ST/F012012/1; SAPIN-2014-00028; RGPAS 462257-2014
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Atomic and Nuclear Physics; Beta-Delayed Neutron Emission

Citation Formats

Caballero-Folch, R., Domingo-Pardo, C., Agramunt, J., Algora, A., Ameil, F., Ayyad, Y., Benlliure, J., Bowry, M., Calvino, F., Cano-Ott, D., Cortes, G., Davinson, T., Dillmann, I., Estrade, A., Evdokimov, A., Faestermann, T., Farinon, F., Galaviz, D., Garcia, A. R., Geissel, H., Gelletly, W., Gernhauser, R., Gomez-Hornillos, M. B., Guerrero, C., Heil, M., Hinke, C., Knobel, R., Kojouharov, I., Kurcewicz, J., Kurz, N., Litvinov, Yu. A., Maier, L., Marganiec, J., Marta, M., Martinez, T., Montes, F., Mukha, I., Napoli, D. R., Nociforo, C., Paradela, C., Pietri, S., Podolyak, Zs., Prochazka, A., Rice, S., Riego, A., Rubio, B., Schaffner, H., Scheidenberger, Ch., Smith, K., Sokol, E., Steiger, K., Sun, B., Tain, J. L., Takechi, M., Testov, D., Weick, H., Wilson, E., Winfield, J. S., Wood, R., Woods, P. J., and Yeremin, A. β -decay half-lives and β -delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N=126. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.95.064322.
Caballero-Folch, R., Domingo-Pardo, C., Agramunt, J., Algora, A., Ameil, F., Ayyad, Y., Benlliure, J., Bowry, M., Calvino, F., Cano-Ott, D., Cortes, G., Davinson, T., Dillmann, I., Estrade, A., Evdokimov, A., Faestermann, T., Farinon, F., Galaviz, D., Garcia, A. R., Geissel, H., Gelletly, W., Gernhauser, R., Gomez-Hornillos, M. B., Guerrero, C., Heil, M., Hinke, C., Knobel, R., Kojouharov, I., Kurcewicz, J., Kurz, N., Litvinov, Yu. A., Maier, L., Marganiec, J., Marta, M., Martinez, T., Montes, F., Mukha, I., Napoli, D. R., Nociforo, C., Paradela, C., Pietri, S., Podolyak, Zs., Prochazka, A., Rice, S., Riego, A., Rubio, B., Schaffner, H., Scheidenberger, Ch., Smith, K., Sokol, E., Steiger, K., Sun, B., Tain, J. L., Takechi, M., Testov, D., Weick, H., Wilson, E., Winfield, J. S., Wood, R., Woods, P. J., & Yeremin, A. β -decay half-lives and β -delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N=126. United States. doi:10.1103/PhysRevC.95.064322.
Caballero-Folch, R., Domingo-Pardo, C., Agramunt, J., Algora, A., Ameil, F., Ayyad, Y., Benlliure, J., Bowry, M., Calvino, F., Cano-Ott, D., Cortes, G., Davinson, T., Dillmann, I., Estrade, A., Evdokimov, A., Faestermann, T., Farinon, F., Galaviz, D., Garcia, A. R., Geissel, H., Gelletly, W., Gernhauser, R., Gomez-Hornillos, M. B., Guerrero, C., Heil, M., Hinke, C., Knobel, R., Kojouharov, I., Kurcewicz, J., Kurz, N., Litvinov, Yu. A., Maier, L., Marganiec, J., Marta, M., Martinez, T., Montes, F., Mukha, I., Napoli, D. R., Nociforo, C., Paradela, C., Pietri, S., Podolyak, Zs., Prochazka, A., Rice, S., Riego, A., Rubio, B., Schaffner, H., Scheidenberger, Ch., Smith, K., Sokol, E., Steiger, K., Sun, B., Tain, J. L., Takechi, M., Testov, D., Weick, H., Wilson, E., Winfield, J. S., Wood, R., Woods, P. J., and Yeremin, A. Fri . "β -decay half-lives and β -delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N=126". United States. doi:10.1103/PhysRevC.95.064322. https://www.osti.gov/servlets/purl/1432625.
@article{osti_1432625,
title = {β -decay half-lives and β -delayed neutron emission probabilities for several isotopes of Au, Hg, Tl, Pb, and Bi, beyond N=126},
author = {Caballero-Folch, R. and Domingo-Pardo, C. and Agramunt, J. and Algora, A. and Ameil, F. and Ayyad, Y. and Benlliure, J. and Bowry, M. and Calvino, F. and Cano-Ott, D. and Cortes, G. and Davinson, T. and Dillmann, I. and Estrade, A. and Evdokimov, A. and Faestermann, T. and Farinon, F. and Galaviz, D. and Garcia, A. R. and Geissel, H. and Gelletly, W. and Gernhauser, R. and Gomez-Hornillos, M. B. and Guerrero, C. and Heil, M. and Hinke, C. and Knobel, R. and Kojouharov, I. and Kurcewicz, J. and Kurz, N. and Litvinov, Yu. A. and Maier, L. and Marganiec, J. and Marta, M. and Martinez, T. and Montes, F. and Mukha, I. and Napoli, D. R. and Nociforo, C. and Paradela, C. and Pietri, S. and Podolyak, Zs. and Prochazka, A. and Rice, S. and Riego, A. and Rubio, B. and Schaffner, H. and Scheidenberger, Ch. and Smith, K. and Sokol, E. and Steiger, K. and Sun, B. and Tain, J. L. and Takechi, M. and Testov, D. and Weick, H. and Wilson, E. and Winfield, J. S. and Wood, R. and Woods, P. J. and Yeremin, A.},
abstractNote = {Background: There have been measurements on roughly 230 nuclei that are β-delayed neutron emitters. They range from 8He up to 150La . Apart from 210Tl, with a branching ratio of only 0.007%, no other neutron emitter has been measured beyond A = 150 . Therefore, new data are needed, particularly in the region of heavy nuclei around N = 126 , in order to guide theoretical models and help understand the formation of the third r-process peak at A ~ 195. Purpose: To measure both β-decay half-lives and neutron branching ratios of several neutron-rich Au, Hg, Tl, Pb, and Bi isotopes beyond N = 126 . Method: Ions of interest were produced by fragmentation of a 238U beam, selected and identified via the GSI-FRS fragment separator. A stack of segmented silicon detectors (SIMBA) was used to measure ion implants and β decays. An array of 30 3He tubes embedded in a polyethylene matrix (BELEN) was used to detect neutrons with high efficiency and selectivity. A self-triggered digital system is employed to acquire data and to enable time correlations. The latter were analyzed with an analytical model and results for the half-lives and neutron-branching ratios were derived by using the binned maximum-likelihood method. Results: Twenty new β-decay half-lives are reported for 204-206Au, 208 – 211Hg, 211 – 216Tl , 215 – 218Pb, and 218 – 220Bi, nine of them for the first time. Neutron emission probabilities are reported for 210, 211Hg and 211 – 216Tl . Conclusions: The new β-decay half-lives are in good agreement with previous measurements on nuclei in this region. Lastly, the measured neutron emission probabilities are comparable to or smaller than values predicted by global models such as relativistic Hartree Bogoliubov plus the relativistic quasi-particle random phase approximation (RHB + RQRPA).},
doi = {10.1103/PhysRevC.95.064322},
journal = {Physical Review C},
number = 6,
volume = 95,
place = {United States},
year = {2017},
month = {6}
}

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