Identification of excited states in theTz=+12nucleus75Rb:The quest for experimental signatures of collective neutron-proton correlations
| Autor: | J. Alexander, C. Baktash, D. G. Sarantites, Carl J Gross, W. Gelletly, D. D. Warner, J. Simpson, H. A. Roth, B. J. Varley, I.H. Lazarus, P. J. Coleman-Smith, Ö. Skeppstedt, K. P. Lieb, Dirk Rudolph, W. Satula, A. Harder, D. M. Cullen, R. A. Cunningham, J. A. Sheikh, M. K. Kabadiyski, J. D. Garrett |
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| Rok vydání: | 1997 |
| Předmět: |
Physics
Nuclear and High Energy Physics Decay scheme Proton 010308 nuclear & particles physics Nuclear Theory Gamma ray 01 natural sciences 7. Clean energy Omega Nuclear physics Pairing Excited state 0103 physical sciences Neutron Atomic physics Nuclear Experiment 010306 general physics Ground state |
| Zdroj: | Physical Review C. 56:R591-R595 |
| ISSN: | 1089-490X 0556-2813 |
| DOI: | 10.1103/physrevc.56.r591 |
| Popis: | 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) |
| Databáze: | OpenAIRE |
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