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Identification of Excited States in the Tz=+1/2 Nucleus 75Rb: The Quest for Experimental Signatures of Collective Neutron-proton Correlations

Gross, C. J.; Rudolph, Dirk LU ; Satula, W.; Alexander, J.; Baktash, C.; ColemanSmith, P. J.; Cullen, D. M.; Cunningham, R. A.; Garrett, J. D. and Gelletly, W., et al. (1997) In Physical Review C (Nuclear Physics) 56(2). p.591-595
Abstract
Excited states in the T-z-1/2 nucleus Rb-75 were observed for the first time using the Ca-40(Ca-40,alpha p) reaction at 128 MeV. Identification was achieved using events detected by the Daresbury recoil separator in coincidence with gamma rays detected in the 45 element EUROGAM I Ge-detector array. Threefold events were used to build a decay scheme which consists of two rotational bands observed to I-pi=(45+/2) and I-pi=(33-/2). The positive parity band in Rb-75 behaves similarly to a negative-parity band in Kr-74 and contains a region of alignment at (h) over bar omega approximate to 0.75 MeV. These data, and those of Sr-77, be interpreted by treating protons and neutrons separately in a cranked shell model approach despite a recent... (More)
Excited states in the T-z-1/2 nucleus Rb-75 were observed for the first time using the Ca-40(Ca-40,alpha p) reaction at 128 MeV. Identification was achieved using events detected by the Daresbury recoil separator in coincidence with gamma rays detected in the 45 element EUROGAM I Ge-detector array. Threefold events were used to build a decay scheme which consists of two rotational bands observed to I-pi=(45+/2) and I-pi=(33-/2). The positive parity band in Rb-75 behaves similarly to a negative-parity band in Kr-74 and contains a region of alignment at (h) over bar omega approximate to 0.75 MeV. These data, and those of Sr-77, be interpreted by treating protons and neutrons separately in a cranked shell model approach despite a recent suggestion for the presence of T=1 neutron-proton pairing correlations in the neighboring self-conjugate, odd-odd Rb-74 ground state band. Our study suggests that some experimental observables such as the energy levels and moments of inertia, may not be able to differentiate between different T=1 pairing phases in these T-z=1/2 nuclei. (Less)
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Physical Review C (Nuclear Physics)
volume
56
issue
2
pages
591 - 595
publisher
American Physical Society
external identifiers
  • scopus:0000331376
ISSN
0556-2813
DOI
10.1103/PhysRevC.56.R591
language
English
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no
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e37df77d-e6b4-4645-a91a-4a6acb57ad0e (old id 3963743)
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http://link.aps.org/doi/10.1103/PhysRevC.56.R591
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2013-08-13 18:49:36
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@article{e37df77d-e6b4-4645-a91a-4a6acb57ad0e,
  abstract     = {Excited states in the T-z-1/2 nucleus Rb-75 were observed for the first time using the Ca-40(Ca-40,alpha p) reaction at 128 MeV. Identification was achieved using events detected by the Daresbury recoil separator in coincidence with gamma rays detected in the 45 element EUROGAM I Ge-detector array. Threefold events were used to build a decay scheme which consists of two rotational bands observed to I-pi=(45+/2) and I-pi=(33-/2). The positive parity band in Rb-75 behaves similarly to a negative-parity band in Kr-74 and contains a region of alignment at (h) over bar omega approximate to 0.75 MeV. These data, and those of Sr-77, be interpreted by treating protons and neutrons separately in a cranked shell model approach despite a recent suggestion for the presence of T=1 neutron-proton pairing correlations in the neighboring self-conjugate, odd-odd Rb-74 ground state band. Our study suggests that some experimental observables such as the energy levels and moments of inertia, may not be able to differentiate between different T=1 pairing phases in these T-z=1/2 nuclei.},
  author       = {Gross, C. J. and Rudolph, Dirk and Satula, W. and Alexander, J. and Baktash, C. and ColemanSmith, P. J. and Cullen, D. M. and Cunningham, R. A. and Garrett, J. D. and Gelletly, W. and Harder, A. and Kabadiyski, M. K. and Lazarus, I. and Lieb, K. P. and Roth, H. A. and Sarantites, D. G. and Sheikh, J. A. and Simpson, J. and Skeppstedt, O. and Varley, B. J. and Warner, D. D.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {2},
  pages        = {591--595},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Identification of Excited States in the Tz=+1/2 Nucleus 75Rb: The Quest for Experimental Signatures of Collective Neutron-proton Correlations},
  url          = {http://dx.doi.org/10.1103/PhysRevC.56.R591},
  volume       = {56},
  year         = {1997},
}