Average resonance capture studies of 198Au: A test of symmetry schemes for odd-odd nuclei

Warner, D.D.; Casten, R. F.; Frank, A.

doi:10.1016/0370-2693(86)90297-2

Cited by 32 publications

(13 citation statements)

References 16 publications

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“…Thus, for nuclei near stability the U n ͑6͞12͒ ≠ U p ͑6͞4͒ scheme can occur only in the Au, Ir region for the negative-parity states formed by the n͑3p 1͞2 , 3p 3͞2 , 2f 5͞2 ͒ 3 p2d 3͞2 configurations. It is encouraging that, indeed, the supersymmetry was observed to be approximately valid in 198 Au [6,11] and 194 Ir [8], the two best studied odd-odd nuclei in this mass region. However, it was realized from the beginning that the ultimate candidate for the test would be the oddodd nucleus 196 Au [6] since the quartet 194,195 Pt,195,196 Au contains the nuclei 194 Pt-195 Pt which are considered to be the best example of the U(6͞12) supersymmetry [12].…”

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confidence: 75%

Evidence for the Existence of Supersymmetry in Atomic Nuclei

et al. 1999

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We found strong evidence for the existence of supersymmetry by studying the odd-odd nucleus 196 Au using the 197 Au͑ d, t͒, 197 Au͑p, d͒, and 198 Hg͑ d, a͒ transfer reactions. High resolution 196 Pt͑ p, d͒ and 196 Pt͑ d, t͒ transfer experiments performed in parallel yielded an improved level scheme of 195 Pt. Using extended supersymmetry, a single fit of the six parameter eigenvalue expression yielded a complete description of all observed low-lying excited states in the four nuclei forming the supermultiplet. The detailed comparison of the transfer amplitudes the odd-odd member of the supermultiplet 196 Au using a semimicroscopic transfer operator provides, then, evidence that this description is correct.

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confidence: 75%

Evidence for the Existence of Supersymmetry in Atomic Nuclei

et al. 1999

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“…(6/4) scheme can only occur in the Au, Ir region for the negative-parity states formed by the u(3pl/2 , 3p3/2, 2fs/2) • 7r2d3/2 configurations. It is encouraging that, indeed, the supersymmetry was observed to be approximately valid in 19SAu [9,14] and 194Ir [11], the two best studied odd-odd nuclei in this mass region. However, it was realised from the beginning that the ultimate candidate for the test would be the odd-odd nucleus 196Au [9] since the quartet 194,19spt,195'196Au contains the nuclei 194pt-195pt which are considered to be the best example of the U(6/12) supersymmetry [15].…”

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confidence: 67%

Supersymmetry in the spectra of complex atomic nuclei

et al. 2002

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Evidence is observed for the existence of supersymmetry from the study of the odd-odd nucleus 196Au using the 19VAu (d, t), 197Au(p, d) and 19SHg(d, a) transfer reactions [1] and combining this with recent information from 77 correlatrion studies [2]. High resolution 196pt(p, d)195Pt and 196pt(d, t)195pt transfer experiments performed in parallel yielded at the same time an improved level scheme of 195pt [3]. Using extended supersymmetry, a single fit of the six parameter eigenvalue expression yielded a complete description of all observed low-lying excited states in the four different nuclei forming the supermultiplet. The detailed comparison of the transfer amplitudes for the states up to 500 keV in the odd-odd member of the supermultiplet 196Au using a semi-microscopic transfer operator provides evidence that this description is correct.Symmetry is an important concept in physics. In finite many-body systems it appears as time reversal, parity and rotational invariance but also in the form of dynamical symmetries. Among all mesoscopic systems the atomic nucleus forms one of the best testing grounds for the use of symmetry concepts because a wealth of experimental spectroscopic information can be obtained. In the field of dynamical symmetries a remarkably versatile model was elaborated in the mid seventies by Arima and Iachello [4]. This Interacting Boson Model considers 2N valence nucleons which are coupled to N nucleon pairs, as s (l = 0) and d (l = 2) bosons. The eveneven nucleus is then described in a space spanned by the irreducible representation (irrep) IN] of UB(6). The model turned out to be very successful for medium-heavy and heavy nuclei.For the description of odd-A nuclei, a fermion needs to be coupled to the N boson system. This can be done by a semi-microscopical approach which relies on seniority in the nuclear shell model [5]. An alternative to this interacting bosonfermion approach is the construction of hamiltonians exhibiting dynamical BoseFermi symmetries that are analytically solvable. In both approaches, the bosonfermion space is spanned by the irrep [g] x [1] of UB(6) | UF(M) where M is the dimension of the single particle space. A further step towards unification was made in the early eighties when Iachello and coworkers embedded the Bose-Fermi symmetry into a graded Lie algebra U(6/M) [6,7]. The supersymmetric irrep [H},

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“…New experimental facilities and detection techniques [7,8,9] offer a unique opportunity for analyzing the supersymmetry classification in greater detail [12]. In reference [13] we pointed out a symmetry route for the theoretical analysis of such reactions, via the use of tensor operators of the algebras and superalgebras.…”

Section: New Experimentsmentioning

confidence: 99%

“…This was achieved by means of one-nucleon transfer reaction experiments leading to the odd-odd nucleus 196 Au, which, together with the other members of the susy quartet ( 194 Pt, 195 Au and 195 Pt) is considered to be the best example of n-susy in nature [6,7,8,9]. We should point out, however, that while these experiments provided the first complete energy classification for 196 Au (which was found to be consistent with the theoretical predictions [6,7,8,9]), the reactions involved ( 197 Au( d, t), 197 Au(p, d) and 198 Hg( d, α)) did not actually test directly the supersymmetric wave functions, as we shall discuss below. Furthermore, whereas these new measurements are very exciting, the dynamical susy framework is so restrictive that there was little hope that other quartets could be found and used to verify the theory [6,7,8,9].…”

Section: Introductionmentioning

confidence: 99%