Identification of excited states and shell model description of the $N=Z+1$ nucleus $^{91}\mathrm{Rh}$

Identification of excited states and shell model description of the $N = Z + 1$ nucleus ${}^{91}{Rh}$

N. Mărginean, C. Rusu, D. Bucurescu, C. Rossi Alvarez, C. A. Ur, D. Bazzacco, S. Lunardi, P. Pavan, G. de Angelis, M. Axiotis, E. Farnea, A. Gadea, M. Ionescu-Bujor, A. Iordăchescu, W. Krolas, Th. Kröll, S. M. Lenzi, T. Martinez, R. Menegazzo, D. R. Napoli, B. Quintana, P. Spolaore, Y. H. Zhang, and J. Wrzesinski

Phys. Rev. C 72, 014302 – Published 7 July 2005; Erratum Phys. Rev. C 72, 039903 (2005)

Abstract

High-spin excited states have been identified in the $N = Z + 1$ nucleus ${}^{91}{Rh}$ with the reaction ${}^{54}{Fe}$ ( ${}^{40}{Ca}, p 2 n γ$ ) at 130 MeV, using the GASP array, the ISIS silicon array, and the n-ring detector system. Two structures have been observed, the positive-parity yrast sequence above the ( $9 / 2^{+}$ ) ground state and a sequence assigned to negative parity that is built on a possible ( $1 / 2^{-}$ ) isomeric state. The observed structures are compared with various shell-model calculations in the ( $p_{1 / 2}, g_{9 / 2}$ ) space.

Received 19 October 2004

DOI:https://doi.org/10.1103/PhysRevC.72.014302

Erratum

Erratum: Identification of excited states and shell model description of the $N = Z + 1$ nucleus ${}^{91}{Rh}$ [Phys. Rev. C 72, 014302 (2005)]

N. Maˇrginean, C. Rusu, D. Bucurescu, C. Rossi Alvarez, C. A. Ur, D. Bazzacco, S. Lunardi, P. Pavan, G. de Angelis, M. Axiotis, E. Farnea, A. Gadea, M. Ionescu-Bujor, A. Iordaˇchescu, W. Krolas, Th. Kröll, S. M. Lenzi, T. Martinez, R. Menegazzo, D. R. Napoli, B. Quintana, P. Spolaore, Y. H. Zhang, and J. Wrzesinski

Phys. Rev. C 72, 039903 (2005)

Authors & Affiliations

N. Mărginean^1,2, C. Rusu^1,2, D. Bucurescu², C. Rossi Alvarez³, C. A. Ur^2,3, D. Bazzacco³, S. Lunardi³, P. Pavan³, G. de Angelis¹, M. Axiotis¹, E. Farnea³, A. Gadea¹, M. Ionescu-Bujor², A. Iordăchescu², W. Krolas⁴, Th. Kröll⁵, S. M. Lenzi³, T. Martinez¹, R. Menegazzo³, D. R. Napoli¹, B. Quintana⁶, P. Spolaore¹, Y. H. Zhang¹, and J. Wrzesinski⁴

¹Instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Italy
²H. Hulubei National Institute for Physics and Nuclear Engineering, Bucharest, Romania
³Dipartimento di Fisica dell'Università and Instituto Nazionale di Fisica Nucleare, Sezione di Padova, Italy
⁴H. Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences, Krakow, Poland
⁵Physik-Department E12, Technische Universität München, Garching, Germany
⁶Grupo de Física Nuclear, Universidad de Salamanca, Spain

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Vol. 72, Iss. 1 — July 2005

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Figure 1
(Color online) Illustration of the assignment of γ-rays to a pxn (Rh isotope) channel. All spectra are a sum of gates on the transitions of energy 447, 840, 868, and 1033 keV, on (a) a $0 α 0 pn$ $γ − γ$ coincidence matrix, (b), $0 α 1 pn$ matrix, and (c) $0 α 2 pn$ matrix, respectively (where, e.g., $0 α 0 pn$ denotes coincidence with zero α particles, zero protons, and neutrons. The lines marked by dotted lines belong to ${}^{91}{Ru}$ (channel $2 pn$ ) and those marked with their energy are candidates for transitions in ${}^{91}{Rh}$ (see the discussion in text). The ${}^{91}{Rh}$ lines illustrated here belong to the strongest populated cascade in this nucleus, assigned as the positive-parity yrast line (see Fig. 4).Reuse & Permissions
Figure 2
(Color online) Similar to Fig. 1, but for a second cascade, more weakly populated, that has been tentatively assigned as a negative-parity cascade (see Fig. 3). The spectra are gates on the transition of 619 keV: (a) on the $0 α 0 pn$ $γ − γ$ coincidence matrix, (b) on the $0 α 1 pn$ matrix, and (c) on the $0 α 2 pn$ matrix. The lines marked by dotted lines belong to ${}^{91}{Ru}$ (channel $2 pn$ ) and are due to a strong transition of energy 616 keV; those marked with their energy have been assigned to ${}^{91}{Rh}$ .Reuse & Permissions
Figure 3
Neutron multiplicity of some γ-rays assigned as transitions in ${}^{91}{Rh}$ . $I (n)$ denotes the intensity of the γ ray in a spectrum obtained, in this case, from a gate on the $0 α 0 pn$ $γ γ$ coincidence matrix, and I(total) is the intensity from the same gate on the $0 α 0 p$ matrix. The triangles show well-known γ rays of ${}^{91}{Ru}$ (neutron multiplicity 1), and the circles are transitions assigned to ${}^{91}{Rh}$ (neutron multiplicity 2).Reuse & Permissions
Figure 4
Level scheme of ${}^{91}{Rh}$ as deduced from the present experiments. For the tentative spin-parity assignments in the negative-parity level sequence, see the discussion in the text. The dashed levels indicate unknown or uncertain order of the two γ-ray transitions involved.Reuse & Permissions
Figure 5
Coincidence spectra demonstrating the level structures observed in ${}^{91}{Rh}$ (Fig. 4). Spectrum (a), sum of double, coincidences between the positive-parity yrast transitions 447, 665, 840, 868, 947, 1033, and 1083 keV, on a $0 α 1 p$ $γ γ γ$ cube; spectrum (b), same as (a) but for double coincidences between transitions of the level structure assigned as negative parity in Fig. 4: 372 keV with the group of transitions 500, 613, 619, and 836 keV; spectrum (c), gate on the 840-keV transition, on a $0 α 0 pn$ $γ γ$ coincidence matrix. This spectrum shows the 372.2-keV transition and its connection, 1065.0 keV, with the positive-parity levels. The peaks from other strong channels that leak into our spectra because of accidental overlap with our gating conditions are not labeled with their energy.Reuse & Permissions
Figure 6
Comparison between the experimental level scheme of ${}^{91}{Rh}$ and the SM calculations described in the text, based on the F-FIT residual interaction of Johnstone and Skouras [19].Reuse & Permissions

Physical Review C

covering nuclear physics

Identification of excited states and shell model description of the $N = Z + 1$ nucleus ${}^{91}{Rh}$

Phys. Rev. C 72, 014302 – Published 7 July 2005; Erratum Phys. Rev. C 72, 039903 (2005)

Abstract

Erratum

Erratum: Identification of excited states and shell model description of the $N = Z + 1$ nucleus ${}^{91}{Rh}$ [Phys. Rev. C 72, 014302 (2005)]

Phys. Rev. C 72, 039903 (2005)

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Physical Review C

covering nuclear physics

Identification of excited states and shell model description of the N=Z+1 nucleus Rh91

Phys. Rev. C 72, 014302 – Published 7 July 2005; Erratum Phys. Rev. C 72, 039903 (2005)

Abstract

Erratum

Erratum: Identification of excited states and shell model description of the N=Z+1 nucleus Rh91 [Phys. Rev. C 72, 014302 (2005)]

Phys. Rev. C 72, 039903 (2005)

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Identification of excited states and shell model description of the $N = Z + 1$ nucleus ${}^{91}{Rh}$

Erratum: Identification of excited states and shell model description of the $N = Z + 1$ nucleus ${}^{91}{Rh}$ [Phys. Rev. C 72, 014302 (2005)]