Early Signal of Emerging Nuclear Collectivity in Neutron-Rich Sb 129

T. J. Gray; J. M. Allmond; A. E. Stuchbery; C. H. Yu; C. Baktash; A. Gargano; A. Galindo-Uribarri; D. C. Radford; J. C. Batchelder; J. R. Beene; C. R. Bingham; L. Coraggio; A. Covello; M. Danchev; C. J. Gross; P. A. Hausladen; N. Itaco; W. Krolas; J. F. Liang; E. Padilla-Rodal; J. Pavan; D. W. Stracener; R. L. Varner

doi:10.1103/PhysRevLett.124.032502

Early Signal of Emerging Nuclear Collectivity in Neutron-Rich Sb 129

T. J. Gray, J. M. Allmond, A. E. Stuchbery, C. H. Yu, C. Baktash, A. Gargano, A. Galindo-Uribarri, D. C. Radford, J. C. Batchelder, J. R. Beene, C. R. Bingham, L. Coraggio, A. Covello, M. Danchev, C. J. Gross, P. A. Hausladen, N. Itaco, W. Krolas, J. F. Liang, E. Padilla-RodalJ. Pavan, D. W. Stracener, R. L. Varner

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Abstract

Radioactive Sb129, which can be treated as a proton plus semimagic Sn128 core within the particle-core coupling scheme, was studied by Coulomb excitation. Reduced electric quadrupole transition probabilities, B(E2), for the 2+ - πg7/2 multiplet members and candidate πd5/2 state were measured. The results indicate that the total electric quadrupole strength of Sb129 is a factor of 1.39(11) larger than the Sn128 core, which is in stark contrast to the expectations of the empirically successful particle-core coupling scheme. Shell-model calculations performed with two different sets of nucleon-nucleon interactions suggest that this enhanced collectivity is due to constructive quadrupole coherence in the wave functions stemming from the proton-neutron residual interactions, where adding one nucleon to a core near a double-shell closure can have a pronounced effect. The enhanced electric quadrupole strength is an early signal of the emerging nuclear collectivity that becomes dominant away from the shell closure.

Original language	English
Article number	032502
Journal	Physical Review Letters
Volume	124
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevLett.124.032502
State	Published - Jan 24 2020

Funding

The authors gratefully acknowledge the HRIBF operations staff for providing the beams used in this study and T. Papenbrock, A. Volya, and J. L. Wood for fruitful discussions. This material is based upon work supported by the U.S. Department of Energy (DOE), Office of Science, Office of Nuclear Physics, under Contract No. DE-AC05-00OR22725, and this research used resources of the Holifield Radioactive Ion Beam Facility of Oak Ridge National Laboratory, which was a DOE Office of Science User Facility. This research was also sponsored by the Australian Research Council under Grants No. DP0773273 and No. DP170101673, and by the U.S. DOE under Contract No. DE-FG02-96ER40963 (U. T. K.). T. J. G. acknowledges the support of the Australian Government Research Training Program. E. P.-R. acknowledges the financial support of Tecnológica-Universidad Nacional Autónoma de México, Grant No. PAPIIT-IN110418.

Funders	Funder number
Tecnológica-Universidad Nacional Autónoma de México	PAPIIT-IN110418
U.S. Department of Energy	DE-FG02-96ER40963
U.S. Department of Energy
Office of Science
Nuclear Physics	DE-AC05-00OR22725
Nuclear Physics
Oak Ridge National Laboratory
Australian Research Council	DP170101673, DP0773273
Australian Research Council

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Gray, T. J., Allmond, J. M., Stuchbery, A. E., Yu, C. H., Baktash, C., Gargano, A., Galindo-Uribarri, A., Radford, D. C., Batchelder, J. C., Beene, J. R., Bingham, C. R., Coraggio, L., Covello, A., Danchev, M., Gross, C. J., Hausladen, P. A., Itaco, N., Krolas, W., Liang, J. F., ... Varner, R. L. (2020). Early Signal of Emerging Nuclear Collectivity in Neutron-Rich Sb 129. Physical Review Letters, 124(3), Article 032502. https://doi.org/10.1103/PhysRevLett.124.032502

@article{668b6738cbaa42738408309fd1229c8b,

title = "Early Signal of Emerging Nuclear Collectivity in Neutron-Rich Sb 129",

abstract = "Radioactive Sb129, which can be treated as a proton plus semimagic Sn128 core within the particle-core coupling scheme, was studied by Coulomb excitation. Reduced electric quadrupole transition probabilities, B(E2), for the 2+ - πg7/2 multiplet members and candidate πd5/2 state were measured. The results indicate that the total electric quadrupole strength of Sb129 is a factor of 1.39(11) larger than the Sn128 core, which is in stark contrast to the expectations of the empirically successful particle-core coupling scheme. Shell-model calculations performed with two different sets of nucleon-nucleon interactions suggest that this enhanced collectivity is due to constructive quadrupole coherence in the wave functions stemming from the proton-neutron residual interactions, where adding one nucleon to a core near a double-shell closure can have a pronounced effect. The enhanced electric quadrupole strength is an early signal of the emerging nuclear collectivity that becomes dominant away from the shell closure.",

author = "Gray, {T. J.} and Allmond, {J. M.} and Stuchbery, {A. E.} and Yu, {C. H.} and C. Baktash and A. Gargano and A. Galindo-Uribarri and Radford, {D. C.} and Batchelder, {J. C.} and Beene, {J. R.} and Bingham, {C. R.} and L. Coraggio and A. Covello and M. Danchev and Gross, {C. J.} and Hausladen, {P. A.} and N. Itaco and W. Krolas and Liang, {J. F.} and E. Padilla-Rodal and J. Pavan and Stracener, {D. W.} and Varner, {R. L.}",

note = "Publisher Copyright: {\textcopyright} 2020 American Physical Society.",

year = "2020",

month = jan,

day = "24",

doi = "10.1103/PhysRevLett.124.032502",

language = "English",

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Gray, TJ, Allmond, JM, Stuchbery, AE, Yu, CH, Baktash, C, Gargano, A, Galindo-Uribarri, A , Radford, DC, Batchelder, JC, Beene, JR, Bingham, CR, Coraggio, L, Covello, A, Danchev, M, Gross, CJ, Hausladen, PA, Itaco, N, Krolas, W, Liang, JF, Padilla-Rodal, E, Pavan, J, Stracener, DW & Varner, RL 2020, 'Early Signal of Emerging Nuclear Collectivity in Neutron-Rich Sb 129', Physical Review Letters, vol. 124, no. 3, 032502. https://doi.org/10.1103/PhysRevLett.124.032502

TY - JOUR

T1 - Early Signal of Emerging Nuclear Collectivity in Neutron-Rich Sb 129

AU - Gray, T. J.

AU - Allmond, J. M.

AU - Stuchbery, A. E.

AU - Yu, C. H.

AU - Baktash, C.

AU - Gargano, A.

AU - Galindo-Uribarri, A.

AU - Radford, D. C.

AU - Batchelder, J. C.

AU - Beene, J. R.

AU - Bingham, C. R.

AU - Coraggio, L.

AU - Covello, A.

AU - Danchev, M.

AU - Gross, C. J.

AU - Hausladen, P. A.

AU - Itaco, N.

AU - Krolas, W.

AU - Liang, J. F.

AU - Padilla-Rodal, E.

AU - Pavan, J.

AU - Stracener, D. W.

AU - Varner, R. L.

PY - 2020/1/24

Y1 - 2020/1/24

N2 - Radioactive Sb129, which can be treated as a proton plus semimagic Sn128 core within the particle-core coupling scheme, was studied by Coulomb excitation. Reduced electric quadrupole transition probabilities, B(E2), for the 2+ - πg7/2 multiplet members and candidate πd5/2 state were measured. The results indicate that the total electric quadrupole strength of Sb129 is a factor of 1.39(11) larger than the Sn128 core, which is in stark contrast to the expectations of the empirically successful particle-core coupling scheme. Shell-model calculations performed with two different sets of nucleon-nucleon interactions suggest that this enhanced collectivity is due to constructive quadrupole coherence in the wave functions stemming from the proton-neutron residual interactions, where adding one nucleon to a core near a double-shell closure can have a pronounced effect. The enhanced electric quadrupole strength is an early signal of the emerging nuclear collectivity that becomes dominant away from the shell closure.

AB - Radioactive Sb129, which can be treated as a proton plus semimagic Sn128 core within the particle-core coupling scheme, was studied by Coulomb excitation. Reduced electric quadrupole transition probabilities, B(E2), for the 2+ - πg7/2 multiplet members and candidate πd5/2 state were measured. The results indicate that the total electric quadrupole strength of Sb129 is a factor of 1.39(11) larger than the Sn128 core, which is in stark contrast to the expectations of the empirically successful particle-core coupling scheme. Shell-model calculations performed with two different sets of nucleon-nucleon interactions suggest that this enhanced collectivity is due to constructive quadrupole coherence in the wave functions stemming from the proton-neutron residual interactions, where adding one nucleon to a core near a double-shell closure can have a pronounced effect. The enhanced electric quadrupole strength is an early signal of the emerging nuclear collectivity that becomes dominant away from the shell closure.

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DO - 10.1103/PhysRevLett.124.032502

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VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

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ER -

Early Signal of Emerging Nuclear Collectivity in Neutron-Rich Sb 129

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