Mass measurements demonstrate a strong N=28 shell gap in argon

Z. Meisel; S. George; S. Ahn; J. Browne; D. Bazin; B. A. Brown; J. F. Carpino; H. Chung; R. H. Cyburt; A. Estradé; M. Famiano; A. Gade; C. Langer; M. Matoš; W. Mittig; F. Montes; D. J. Morrissey; J. Pereira; H. Schatz; J. Schatz; M. Scott; D. Shapira; K. Smith; J. Stevens; W. Tan; O. Tarasov; S. Towers; K. Wimmer; J. R. Winkelbauer; J. Yurkon; R. G.T. Zegers

doi:10.1103/PhysRevLett.114.022501

Mass measurements demonstrate a strong N=28 shell gap in argon

Z. Meisel, S. George, S. Ahn, J. Browne, D. Bazin, B. A. Brown, J. F. Carpino, H. Chung, R. H. Cyburt, A. Estradé, M. Famiano, A. Gade, C. Langer, M. Matoš, W. Mittig, F. Montes, D. J. Morrissey, J. Pereira, H. Schatz, J. SchatzM. Scott, D. Shapira, K. Smith, J. Stevens, W. Tan, O. Tarasov, S. Towers, K. Wimmer, J. R. Winkelbauer, J. Yurkon, R. G.T. Zegers

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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 Ar48 and Ar49 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.

Original language	English
Article number	022501
Journal	Physical Review Letters
Volume	114
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.114.022501
State	Published - 15 Jan 2015
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (all)

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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., ... Zegers, R. G. T. (2015). Mass measurements demonstrate a strong N=28 shell gap in argon. Physical Review Letters, 114(2), Article 022501. https://doi.org/10.1103/PhysRevLett.114.022501

@article{d20a9369d77c41de9771fa5e10bd6b37,

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 Ar48 and Ar49 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.",

author = "Z. Meisel and S. George and S. Ahn and J. Browne and D. Bazin and Brown, {B. A.} and Carpino, {J. F.} and H. Chung and Cyburt, {R. H.} and A. Estrad{\'e} and M. Famiano and A. Gade and C. Langer and M. Mato{\v s} and W. Mittig and F. Montes and Morrissey, {D. J.} and J. Pereira and H. Schatz and J. Schatz and M. Scott and D. Shapira and K. Smith and J. Stevens and W. Tan and O. Tarasov and S. Towers and K. Wimmer and Winkelbauer, {J. R.} and J. Yurkon and Zegers, {R. G.T.}",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = jan,

day = "15",

doi = "10.1103/PhysRevLett.114.022501",

language = "English",

volume = "114",

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Meisel, Z, George, S, Ahn, S, Browne, J, Bazin, D, Brown, BA, Carpino, JF, Chung, H, Cyburt, RH, Estradé, A, Famiano, M, Gade, A, Langer, C, Matoš, M, Mittig, W, Montes, F, Morrissey, DJ, Pereira, J, Schatz, H, Schatz, J, Scott, M, Shapira, D, Smith, K, Stevens, J, Tan, W, Tarasov, O, Towers, S, Wimmer, K, Winkelbauer, JR, Yurkon, J & Zegers, RGT 2015, 'Mass measurements demonstrate a strong N=28 shell gap in argon', Physical Review Letters, vol. 114, no. 2, 022501. https://doi.org/10.1103/PhysRevLett.114.022501

TY - JOUR

T1 - Mass measurements demonstrate a strong N=28 shell gap in argon

AU - Meisel, Z.

AU - George, S.

AU - Ahn, S.

AU - Browne, J.

AU - Bazin, D.

AU - Brown, B. A.

AU - Carpino, J. F.

AU - Chung, H.

AU - Cyburt, R. H.

AU - Estradé, A.

AU - Famiano, M.

AU - Gade, A.

AU - Langer, C.

AU - Matoš, M.

AU - Mittig, W.

AU - Montes, F.

AU - Morrissey, D. J.

AU - Pereira, J.

AU - Schatz, H.

AU - Schatz, J.

AU - Scott, M.

AU - Shapira, D.

AU - Smith, K.

AU - Stevens, J.

AU - Tan, W.

AU - Tarasov, O.

AU - Towers, S.

AU - Wimmer, K.

AU - Winkelbauer, J. R.

AU - Yurkon, J.

AU - Zegers, R. G.T.

PY - 2015/1/15

Y1 - 2015/1/15

N2 - 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 Ar48 and Ar49 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.

AB - 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 Ar48 and Ar49 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.

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DO - 10.1103/PhysRevLett.114.022501

M3 - Article

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AN - SCOPUS:84921653093

SN - 0031-9007

VL - 114

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 022501

ER -

Mass measurements demonstrate a strong N=28 shell gap in argon

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