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Title: Particle- $$\gamma$$ γ coincidence spectroscopy of the N = 90 nucleus 154Gd by ( $$p,t\gamma$$ p , t γ )

Abstract

A segmented Si-telescope and HPGe array, STARS-LIBERACE, was used to study the 156Gd(p,t )154Gd direct reaction by particle- coincidence spectroscopy. New cross sections with a 25- MeV proton beam are reported and compared to previous (p,t) and (t,p) studies. Furthermore, additional evidence for coexisting K = 0+1 , 2+1 and 0+2 , 2+2 configurations at N = 90 is presented. Direct and indirect population patterns of the low-lying states are also explored. Review of the new and existing evidence fa- vors an interpretation based on a configuration-dependent pairing interaction. The weakening of monopole pairing strength and an increase in quadrupole pairing strength could bring 2p-2h 0+ states below 2 . This may account for a large number of the low-lying 0+ states observed in two-nucleon transfer reactions. A hypothesis for the the origin of the 0+2 and 0+3 states is provided.

Authors:
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [2];  [7];  [6];  [2];  [8];  [9];  [4];  [4];  [8];  [10];  [4];  [8];  [4] more »;  [4];  [6];  [11];  [12] « less
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Richmond, Richmond, VA (United States)
  2. Univ. of Richmond, Richmond, VA (United States)
  3. Univ. of Richmond, Richmond, VA (United States); Univ. of Surrey, Guildford (United Kingdom)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. Georgia Inst. of Technology, Atlanta, GA (United States)
  8. Rhodes College, Memphis, TN (United States)
  9. Univ. of California, Berkeley, CA (United States)
  10. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Wisconsin, La Crosse, WI (United States)
  11. Univ. of California, Berkeley, CA (United States); TRIUMF, Vancouver, BC (Canada)
  12. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); iThemba LABS, Somerset West (South Africa)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1348327
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
European Physical Journal. A
Additional Journal Information:
Journal Volume: 53; Journal Issue: 3; Journal ID: ISSN 1434-6001
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Allmond, J. M., Beausang, C. W., Ross, T. J., Humby, P., Basunia, M. S., Bernstein, L. A., Bleuel, D. L., Brooks, W., Brown, N., Burke, J. T., Darakchieva, B. K., Dudziak, K. R., Evans, K. E., Fallon, P., Jeppesen, H. B., LeBlanc, J. D., Lesher, S. R., McMahan, M. A., Meyer, D. A., Phair, L., Rasmussen, J. O., Scielzo, N. D., Stroberg, S. R., and Wiedeking, M. Particle- $\gamma$ γ coincidence spectroscopy of the N = 90 nucleus 154Gd by ( $p,t\gamma$ p , t γ ). United States: N. p., 2017. Web. doi:10.1140/epja/i2017-12253-2.
Allmond, J. M., Beausang, C. W., Ross, T. J., Humby, P., Basunia, M. S., Bernstein, L. A., Bleuel, D. L., Brooks, W., Brown, N., Burke, J. T., Darakchieva, B. K., Dudziak, K. R., Evans, K. E., Fallon, P., Jeppesen, H. B., LeBlanc, J. D., Lesher, S. R., McMahan, M. A., Meyer, D. A., Phair, L., Rasmussen, J. O., Scielzo, N. D., Stroberg, S. R., & Wiedeking, M. Particle- $\gamma$ γ coincidence spectroscopy of the N = 90 nucleus 154Gd by ( $p,t\gamma$ p , t γ ). United States. doi:10.1140/epja/i2017-12253-2.
Allmond, J. M., Beausang, C. W., Ross, T. J., Humby, P., Basunia, M. S., Bernstein, L. A., Bleuel, D. L., Brooks, W., Brown, N., Burke, J. T., Darakchieva, B. K., Dudziak, K. R., Evans, K. E., Fallon, P., Jeppesen, H. B., LeBlanc, J. D., Lesher, S. R., McMahan, M. A., Meyer, D. A., Phair, L., Rasmussen, J. O., Scielzo, N. D., Stroberg, S. R., and Wiedeking, M. Wed . "Particle- $\gamma$ γ coincidence spectroscopy of the N = 90 nucleus 154Gd by ( $p,t\gamma$ p , t γ )". United States. doi:10.1140/epja/i2017-12253-2. https://www.osti.gov/servlets/purl/1348327.
@article{osti_1348327,
title = {Particle- $\gamma$ γ coincidence spectroscopy of the N = 90 nucleus 154Gd by ( $p,t\gamma$ p , t γ )},
author = {Allmond, J. M. and Beausang, C. W. and Ross, T. J. and Humby, P. and Basunia, M. S. and Bernstein, L. A. and Bleuel, D. L. and Brooks, W. and Brown, N. and Burke, J. T. and Darakchieva, B. K. and Dudziak, K. R. and Evans, K. E. and Fallon, P. and Jeppesen, H. B. and LeBlanc, J. D. and Lesher, S. R. and McMahan, M. A. and Meyer, D. A. and Phair, L. and Rasmussen, J. O. and Scielzo, N. D. and Stroberg, S. R. and Wiedeking, M.},
abstractNote = {A segmented Si-telescope and HPGe array, STARS-LIBERACE, was used to study the 156Gd(p,t )154Gd direct reaction by particle- coincidence spectroscopy. New cross sections with a 25- MeV proton beam are reported and compared to previous (p,t) and (t,p) studies. Furthermore, additional evidence for coexisting K = 0+1 , 2+1 and 0+2 , 2+2 configurations at N = 90 is presented. Direct and indirect population patterns of the low-lying states are also explored. Review of the new and existing evidence fa- vors an interpretation based on a configuration-dependent pairing interaction. The weakening of monopole pairing strength and an increase in quadrupole pairing strength could bring 2p-2h 0+ states below 2 . This may account for a large number of the low-lying 0+ states observed in two-nucleon transfer reactions. A hypothesis for the the origin of the 0+2 and 0+3 states is provided.},
doi = {10.1140/epja/i2017-12253-2},
journal = {European Physical Journal. A},
number = 3,
volume = 53,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

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