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Title: Mass Measurements Demonstrate a Strong N = 28 Shell Gap in Argon

Abstract

We present results from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State University. We report the first mass measurements of 48Ar and 49Ar and find atomic mass excesses of -22.28(31) MeV and -17.8(1.1) MeV, respectively. These masses provide strong evidence for the closed shell nature of neutron number N = 28 in argon, which is therefore the lowest even-Z element exhibiting the N = 28 closed shell. The resulting trend in binding-energy differences, which probes the strength of the N = 28 shell, compares favorably with shell-model calculations in the sd-pf shell using SDPF-U and SDPF-MU Hamiltonians.

Authors:
 [1];  [2];  [3];  [1];  [4];  [5];  [6];  [6];  [3];  [7];  [6];  [5];  [3];  [8];  [5];  [3];  [9];  [3];  [1];  [4] more »;  [5];  [10];  [11];  [1];  [12];  [4];  [6];  [4];  [5];  [4];  [1] « less
  1. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. and Dept. of Physics and Astronomy and Joint Inst. for Nuclear Astrophysics
  2. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. and Joint Inst. for Nuclear Astrophysics; Max Planck Inst. for Nuclear Physics, Heidelberg (Germany)
  3. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. and Joint Inst. for Nuclear Astrophysics
  4. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  5. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. and Dept. of Physics and Astronomy
  6. Western Michigan Univ., Kalamazoo MI (United States). Dept. of Physics
  7. Univ. of Edinburgh, Scotland (United Kingdom). School of Physics and Astronomy
  8. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy
  9. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. and Dept. of Chemistry
  10. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  11. Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics; Univ. of Notre Dame, IN (United States). Dept. of Physics
  12. Univ. of Notre Dame, IN (United States). Dept. of Physics
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1336577
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Meisel, Z., George, S., Ahn, S., Browne, J., Bazin, D., Brown, B. A., Carpino, J. F., Chung, H., Cyburt, R. H., Estradé, A., Famiano, M., Gade, A., Langer, C., Matoš, M., Mittig, W., Montes, F., Morrissey, D. J., Pereira, J., Schatz, H., Schatz, J., Scott, M., Shapira, D., Smith, K., Stevens, J., Tan, W., Tarasov, O., Towers, S., Wimmer, K., Winkelbauer, J. R., Yurkon, J., and Zegers, R. G. T. Mass Measurements Demonstrate a Strong N = 28 Shell Gap in Argon. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.114.022501.
Meisel, Z., George, S., Ahn, S., Browne, J., Bazin, D., Brown, B. A., Carpino, J. F., Chung, H., Cyburt, R. H., Estradé, A., Famiano, M., Gade, A., Langer, C., Matoš, M., Mittig, W., Montes, F., Morrissey, D. J., Pereira, J., Schatz, H., Schatz, J., Scott, M., Shapira, D., Smith, K., Stevens, J., Tan, W., Tarasov, O., Towers, S., Wimmer, K., Winkelbauer, J. R., Yurkon, J., & Zegers, R. G. T. Mass Measurements Demonstrate a Strong N = 28 Shell Gap in Argon. United States. doi:10.1103/PhysRevLett.114.022501.
Meisel, Z., George, S., Ahn, S., Browne, J., Bazin, D., Brown, B. A., Carpino, J. F., Chung, H., Cyburt, R. H., Estradé, A., Famiano, M., Gade, A., Langer, C., Matoš, M., Mittig, W., Montes, F., Morrissey, D. J., Pereira, J., Schatz, H., Schatz, J., Scott, M., Shapira, D., Smith, K., Stevens, J., Tan, W., Tarasov, O., Towers, S., Wimmer, K., Winkelbauer, J. R., Yurkon, J., and Zegers, R. G. T. Thu . "Mass Measurements Demonstrate a Strong N = 28 Shell Gap in Argon". United States. doi:10.1103/PhysRevLett.114.022501. https://www.osti.gov/servlets/purl/1336577.
@article{osti_1336577,
title = {Mass Measurements Demonstrate a Strong N = 28 Shell Gap in Argon},
author = {Meisel, Z. and George, S. and Ahn, S. and Browne, J. and Bazin, D. and Brown, B. A. and Carpino, J. F. and Chung, H. and Cyburt, R. H. and Estradé, A. and Famiano, M. and Gade, A. and Langer, C. and Matoš, M. and Mittig, W. and Montes, F. and Morrissey, D. J. and Pereira, J. and Schatz, H. and Schatz, J. and Scott, M. and Shapira, D. and Smith, K. and Stevens, J. and Tan, W. and Tarasov, O. and Towers, S. and Wimmer, K. and Winkelbauer, J. R. and Yurkon, J. and Zegers, R. G. T.},
abstractNote = {We present results from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State University. We report the first mass measurements of 48Ar and 49Ar and find atomic mass excesses of -22.28(31) MeV and -17.8(1.1) MeV, respectively. These masses provide strong evidence for the closed shell nature of neutron number N = 28 in argon, which is therefore the lowest even-Z element exhibiting the N = 28 closed shell. The resulting trend in binding-energy differences, which probes the strength of the N = 28 shell, compares favorably with shell-model calculations in the sd-pf shell using SDPF-U and SDPF-MU Hamiltonians.},
doi = {10.1103/PhysRevLett.114.022501},
journal = {Physical Review Letters},
number = 2,
volume = 114,
place = {United States},
year = {2015},
month = {1}
}

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