Nuclear structure of the closed subshell nucleus 90Zr studied with the (n,n′ γ) reaction

P. E. Garrett; W. Younes; J. A. Backer; L. A. Bernstein; E. M. Baum; D. P. DiPrete; R. A. Gatenby; E. L. Johnson; C. A. McGrath; S. W. Yates; M. Devlin; N. Fotiades; R. O. Nelson; B. A. Brown

Nuclear structure of the closed subshell nucleus ⁹⁰Zr studied with the (n,n′ γ) reaction

P. E. Garrett, W. Younes, J. A. Backer, L. A. Bernstein, E. M. Baum, D. P. DiPrete, R. A. Gatenby, E. L. Johnson, C. A. McGrath, S. W. Yates, M. Devlin, N. Fotiades, R. O. Nelson, B. A. Brown

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25 Scopus citations

Abstract

States in ⁹⁰Zr have been observed with the (n,n′ γ) reaction using both spallation and monoenergetic accelerator-produced neutrons. A scheme comprised of 81 levels and 157 transitions was constructed concentrating on levels below 5.6 MeV in excitation energy. Spins have been determined by considering data from all experimental studies performed for ⁹⁰Zr. Lifetimes have been deduced using the Doppler-shift attenuation method for many of the states, and transition rates have been obtained. A spherical shell-model interpretation in terms of particle-hole excitations assuming a ⁸⁸Sr closed core is given. In some cases, enhancements in B(M1) and B(E2) values are observed that cannot be explained by assuming simple particle-hole excitations. Shell-model calculations using an extended fpg-shell-model space reproduce the spectrum of excited states very well, and the gross features of the B(M1) and B(E2) transition rates. Transition rates for individual levels show discrepancies between calculations and experimental values.

Original language	English
Article number	024312
Pages (from-to)	243121-2431221
Number of pages	2188101
Journal	Physical Review C - Nuclear Physics
Volume	68
Issue number	2
State	Published - Aug 2003

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Garrett, P. E., Younes, W., Backer, J. A., Bernstein, L. A., Baum, E. M., DiPrete, D. P., Gatenby, R. A., Johnson, E. L., McGrath, C. A., Yates, S. W., Devlin, M., Fotiades, N., Nelson, R. O., & Brown, B. A. (2003). Nuclear structure of the closed subshell nucleus ⁹⁰Zr studied with the (n,n′ γ) reaction. Physical Review C - Nuclear Physics, 68(2), 243121-2431221. [024312].

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title = "Nuclear structure of the closed subshell nucleus 90Zr studied with the (n,n′ γ) reaction",

abstract = "States in 90Zr have been observed with the (n,n′ γ) reaction using both spallation and monoenergetic accelerator-produced neutrons. A scheme comprised of 81 levels and 157 transitions was constructed concentrating on levels below 5.6 MeV in excitation energy. Spins have been determined by considering data from all experimental studies performed for 90Zr. Lifetimes have been deduced using the Doppler-shift attenuation method for many of the states, and transition rates have been obtained. A spherical shell-model interpretation in terms of particle-hole excitations assuming a 88Sr closed core is given. In some cases, enhancements in B(M1) and B(E2) values are observed that cannot be explained by assuming simple particle-hole excitations. Shell-model calculations using an extended fpg-shell-model space reproduce the spectrum of excited states very well, and the gross features of the B(M1) and B(E2) transition rates. Transition rates for individual levels show discrepancies between calculations and experimental values.",

author = "Garrett, {P. E.} and W. Younes and Backer, {J. A.} and Bernstein, {L. A.} and Baum, {E. M.} and DiPrete, {D. P.} and Gatenby, {R. A.} and Johnson, {E. L.} and McGrath, {C. A.} and Yates, {S. W.} and M. Devlin and N. Fotiades and Nelson, {R. O.} and Brown, {B. A.}",

year = "2003",

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language = "English",

volume = "68",

pages = "243121--2431221",

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TY - JOUR

T1 - Nuclear structure of the closed subshell nucleus 90Zr studied with the (n,n′ γ) reaction

AU - Garrett, P. E.

AU - Younes, W.

AU - Backer, J. A.

AU - Bernstein, L. A.

AU - Baum, E. M.

AU - DiPrete, D. P.

AU - Gatenby, R. A.

AU - Johnson, E. L.

AU - McGrath, C. A.

AU - Yates, S. W.

AU - Devlin, M.

AU - Fotiades, N.

AU - Nelson, R. O.

AU - Brown, B. A.

PY - 2003/8

Y1 - 2003/8

N2 - States in 90Zr have been observed with the (n,n′ γ) reaction using both spallation and monoenergetic accelerator-produced neutrons. A scheme comprised of 81 levels and 157 transitions was constructed concentrating on levels below 5.6 MeV in excitation energy. Spins have been determined by considering data from all experimental studies performed for 90Zr. Lifetimes have been deduced using the Doppler-shift attenuation method for many of the states, and transition rates have been obtained. A spherical shell-model interpretation in terms of particle-hole excitations assuming a 88Sr closed core is given. In some cases, enhancements in B(M1) and B(E2) values are observed that cannot be explained by assuming simple particle-hole excitations. Shell-model calculations using an extended fpg-shell-model space reproduce the spectrum of excited states very well, and the gross features of the B(M1) and B(E2) transition rates. Transition rates for individual levels show discrepancies between calculations and experimental values.

AB - States in 90Zr have been observed with the (n,n′ γ) reaction using both spallation and monoenergetic accelerator-produced neutrons. A scheme comprised of 81 levels and 157 transitions was constructed concentrating on levels below 5.6 MeV in excitation energy. Spins have been determined by considering data from all experimental studies performed for 90Zr. Lifetimes have been deduced using the Doppler-shift attenuation method for many of the states, and transition rates have been obtained. A spherical shell-model interpretation in terms of particle-hole excitations assuming a 88Sr closed core is given. In some cases, enhancements in B(M1) and B(E2) values are observed that cannot be explained by assuming simple particle-hole excitations. Shell-model calculations using an extended fpg-shell-model space reproduce the spectrum of excited states very well, and the gross features of the B(M1) and B(E2) transition rates. Transition rates for individual levels show discrepancies between calculations and experimental values.

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ER -

Nuclear structure of the closed subshell nucleus ⁹⁰Zr studied with the (n,n′ γ) reaction

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