High-precision B(E2) measurements of semi-magic Ni 58,60,62,64 by Coulomb excitation

J. M. Allmond; B. A. Brown; A. E. Stuchbery; A. Galindo-Uribarri; E. Padilla-Rodal; D. C. Radford; J. C. Batchelder; M. E. Howard; J. F. Liang; B. Manning; R. L. Varner; C. H. Yu

doi:10.1103/PhysRevC.90.034309

High-precision B(E2) measurements of semi-magic Ni 58,60,62,64 by Coulomb excitation

J. M. Allmond^*, B. A. Brown, A. E. Stuchbery, A. Galindo-Uribarri, E. Padilla-Rodal, D. C. Radford, J. C. Batchelder, M. E. Howard, J. F. Liang, B. Manning, R. L. Varner, C. H. Yu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

High-precision reduced electric-quadrupole transition probabilities B(E2;01+→21+) have been measured from single-step Coulomb excitation of semi-magic Ni58,60,62,64 (Z=28) beams at 1.8 MeV per nucleon on a natural carbon target. The energy loss of the nickel beams through the carbon target were directly measured with a zero-degree Bragg detector and the absolute B(E2) values were normalized by Rutherford scattering. The B(E2) values disagree with recent lifetime studies that employed the Doppler-shift attenuation method. The present high-precision B(E2) values reveal an asymmetry about Ni62, midshell between N=28 and 40, with larger values towards Ni56 (Z=N=28). The experimental B(E2) values are compared with shell-model calculations in the full pf model space and the results indicate a soft Ni56 core.

Original language	English
Article number	034309
Journal	Physical Review C - Nuclear Physics
Volume	90
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.90.034309
Publication status	Published - 15 Sept 2014

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Allmond, J. M., Brown, B. A., Stuchbery, A. E., Galindo-Uribarri, A., Padilla-Rodal, E., Radford, D. C., Batchelder, J. C., Howard, M. E., Liang, J. F., Manning, B., Varner, R. L., & Yu, C. H. (2014). High-precision B(E2) measurements of semi-magic Ni 58,60,62,64 by Coulomb excitation. Physical Review C - Nuclear Physics, 90(3), Article 034309. https://doi.org/10.1103/PhysRevC.90.034309

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title = "High-precision B(E2) measurements of semi-magic Ni 58,60,62,64 by Coulomb excitation",

abstract = "High-precision reduced electric-quadrupole transition probabilities B(E2;01+→21+) have been measured from single-step Coulomb excitation of semi-magic Ni58,60,62,64 (Z=28) beams at 1.8 MeV per nucleon on a natural carbon target. The energy loss of the nickel beams through the carbon target were directly measured with a zero-degree Bragg detector and the absolute B(E2) values were normalized by Rutherford scattering. The B(E2) values disagree with recent lifetime studies that employed the Doppler-shift attenuation method. The present high-precision B(E2) values reveal an asymmetry about Ni62, midshell between N=28 and 40, with larger values towards Ni56 (Z=N=28). The experimental B(E2) values are compared with shell-model calculations in the full pf model space and the results indicate a soft Ni56 core.",

author = "Allmond, {J. M.} and Brown, {B. A.} and Stuchbery, {A. E.} and A. Galindo-Uribarri and E. Padilla-Rodal and Radford, {D. C.} and Batchelder, {J. C.} and Howard, {M. E.} and Liang, {J. F.} and B. Manning and Varner, {R. L.} and Yu, {C. H.}",

note = "Publisher Copyright: {\textcopyright} 2014 American Physical Society.",

year = "2014",

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doi = "10.1103/PhysRevC.90.034309",

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AU - Allmond, J. M.

AU - Brown, B. A.

AU - Stuchbery, A. E.

AU - Galindo-Uribarri, A.

AU - Padilla-Rodal, E.

AU - Radford, D. C.

AU - Batchelder, J. C.

AU - Howard, M. E.

AU - Liang, J. F.

AU - Manning, B.

AU - Varner, R. L.

AU - Yu, C. H.

PY - 2014/9/15

Y1 - 2014/9/15

N2 - High-precision reduced electric-quadrupole transition probabilities B(E2;01+→21+) have been measured from single-step Coulomb excitation of semi-magic Ni58,60,62,64 (Z=28) beams at 1.8 MeV per nucleon on a natural carbon target. The energy loss of the nickel beams through the carbon target were directly measured with a zero-degree Bragg detector and the absolute B(E2) values were normalized by Rutherford scattering. The B(E2) values disagree with recent lifetime studies that employed the Doppler-shift attenuation method. The present high-precision B(E2) values reveal an asymmetry about Ni62, midshell between N=28 and 40, with larger values towards Ni56 (Z=N=28). The experimental B(E2) values are compared with shell-model calculations in the full pf model space and the results indicate a soft Ni56 core.

AB - High-precision reduced electric-quadrupole transition probabilities B(E2;01+→21+) have been measured from single-step Coulomb excitation of semi-magic Ni58,60,62,64 (Z=28) beams at 1.8 MeV per nucleon on a natural carbon target. The energy loss of the nickel beams through the carbon target were directly measured with a zero-degree Bragg detector and the absolute B(E2) values were normalized by Rutherford scattering. The B(E2) values disagree with recent lifetime studies that employed the Doppler-shift attenuation method. The present high-precision B(E2) values reveal an asymmetry about Ni62, midshell between N=28 and 40, with larger values towards Ni56 (Z=N=28). The experimental B(E2) values are compared with shell-model calculations in the full pf model space and the results indicate a soft Ni56 core.

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High-precision B(E2) measurements of semi-magic Ni 58,60,62,64 by Coulomb excitation

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