Low energy levels in 72Ni

M. Sawicka; R. Grzywacz; I. Matea; H. Grawe; M. Pfützner; J. M. Daugas; M. Lewitowicz; D. L. Balabanski; F. Becker; G. Bélier; C. Bingham; C. Borcea; E. Bouchez; A. Buta; M. La Commara; E. Dragulescu; G. De France; G. Georgiev; J. Giovinazzo; M. Górska; F. Hammache; M. Hass; M. Hellström; F. Ibrahim; Z. Janas; H. Mach; P. Mayet; V. Méot; F. Negoita; G. Neyens; F. De Oliveira Santos; R. D. Page; O. Perru; Zs Podolÿk; O. Roig; K. P. Rykaczewski; M. G. Saint-Laurent; J. E. Sauvestre; O. Sorlin; M. Stanoiu; I. Stefan; C. Stodel; Ch Theisen; D. Verney; J. Z̈ylicz

doi:10.1103/PhysRevC.68.044304

Low energy levels in ⁷²Ni

M. Sawicka, R. Grzywacz, I. Matea, H. Grawe, M. Pfützner, J. M. Daugas, M. Lewitowicz, D. L. Balabanski, F. Becker, G. Bélier, C. Bingham, C. Borcea, E. Bouchez, A. Buta, M. La Commara, E. Dragulescu, G. De France, G. Georgiev, J. Giovinazzo, M. GórskaF. Hammache, M. Hass, M. Hellström, F. Ibrahim, Z. Janas, H. Mach, P. Mayet, V. Méot, F. Negoita, G. Neyens, F. De Oliveira Santos, R. D. Page, O. Perru, Zs Podolÿk, O. Roig, K. P. Rykaczewski, M. G. Saint-Laurent, J. E. Sauvestre, O. Sorlin, M. Stanoiu, I. Stefan, C. Stodel, Ch Theisen, D. Verney, J. Z̈ylicz

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Abstract

The yrast J^π=8⁺ states in neutron-rich ^70,72,74,76Ni nuclei are predicted to be isomeric. The present paper describes two GANIL experiments. In the first of them a search was made for the 8⁺ isomeric states in ^72,74Ni nuclei via fragmentation of ⁷⁶Ge using the ion γ-decay correlation technique. Although these states were not observed, limits for their lifetimes were determined. In the second experiment the decay spectroscopy of ^70,72Co nuclei was performed using fragmentation of a ⁸⁶Kr^36- beam and the new LISE2000 spectrometer. The β delayed γ rays from the decay of ^70,72Co to ^70,72Ni were observed using the EXOGAM germanium detectors. The half life of ⁷²Co was measured to be 62(3) ms and the level sequence of the lowest excited states in ⁷²Ni was suggested, with the 2⁺ state at 1096 keV. An attempt to reproduce the level scheme in terms of shell-model calculations was undertaken. The reasons for the disappearance of the 8⁺ isomer in ⁷²Ni are discussed.

Original language	English
Article number	044304
Pages (from-to)	443041-443046
Number of pages	6
Journal	Physical Review C - Nuclear Physics
Volume	68
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.68.044304
State	Published - Oct 2003

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Sawicka, M., Grzywacz, R., Matea, I., Grawe, H., Pfützner, M., Daugas, J. M., Lewitowicz, M., Balabanski, D. L., Becker, F., Bélier, G., Bingham, C., Borcea, C., Bouchez, E., Buta, A., La Commara, M., Dragulescu, E., De France, G., Georgiev, G., Giovinazzo, J., ... Z̈ylicz, J. (2003). Low energy levels in ⁷²Ni. Physical Review C - Nuclear Physics, 68(4), 443041-443046. Article 044304. https://doi.org/10.1103/PhysRevC.68.044304

@article{67761e9d1d814071a46385ef467c91a0,

title = "Low energy levels in 72Ni",

abstract = "The yrast Jπ=8+ states in neutron-rich 70,72,74,76Ni nuclei are predicted to be isomeric. The present paper describes two GANIL experiments. In the first of them a search was made for the 8+ isomeric states in 72,74Ni nuclei via fragmentation of 76Ge using the ion γ-decay correlation technique. Although these states were not observed, limits for their lifetimes were determined. In the second experiment the decay spectroscopy of 70,72Co nuclei was performed using fragmentation of a 86Kr36- beam and the new LISE2000 spectrometer. The β delayed γ rays from the decay of 70,72Co to 70,72Ni were observed using the EXOGAM germanium detectors. The half life of 72Co was measured to be 62(3) ms and the level sequence of the lowest excited states in 72Ni was suggested, with the 2+ state at 1096 keV. An attempt to reproduce the level scheme in terms of shell-model calculations was undertaken. The reasons for the disappearance of the 8+ isomer in 72Ni are discussed.",

author = "M. Sawicka and R. Grzywacz and I. Matea and H. Grawe and M. Pf{\"u}tzner and Daugas, \{J. M.\} and M. Lewitowicz and Balabanski, \{D. L.\} and F. Becker and G. B{\'e}lier and C. Bingham and C. Borcea and E. Bouchez and A. Buta and \{La Commara\}, M. and E. Dragulescu and \{De France\}, G. and G. Georgiev and J. Giovinazzo and M. G{\'o}rska and F. Hammache and M. Hass and M. Hellstr{\"o}m and F. Ibrahim and Z. Janas and H. Mach and P. Mayet and V. M{\'e}ot and F. Negoita and G. Neyens and \{De Oliveira Santos\}, F. and Page, \{R. D.\} and O. Perru and Zs Podol{\"y}k and O. Roig and Rykaczewski, \{K. P.\} and Saint-Laurent, \{M. G.\} and Sauvestre, \{J. E.\} and O. Sorlin and M. Stanoiu and I. Stefan and C. Stodel and Ch Theisen and D. Verney and J. {\"Z}ylicz",

year = "2003",

month = oct,

doi = "10.1103/PhysRevC.68.044304",

language = "English",

volume = "68",

pages = "443041--443046",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

number = "4",

}

Sawicka, M, Grzywacz, R, Matea, I, Grawe, H, Pfützner, M, Daugas, JM, Lewitowicz, M, Balabanski, DL, Becker, F, Bélier, G, Bingham, C, Borcea, C, Bouchez, E, Buta, A, La Commara, M, Dragulescu, E, De France, G, Georgiev, G, Giovinazzo, J, Górska, M, Hammache, F, Hass, M, Hellström, M, Ibrahim, F, Janas, Z, Mach, H, Mayet, P, Méot, V, Negoita, F, Neyens, G, De Oliveira Santos, F, Page, RD, Perru, O, Podolÿk, Z, Roig, O, Rykaczewski, KP, Saint-Laurent, MG, Sauvestre, JE, Sorlin, O, Stanoiu, M, Stefan, I, Stodel, C, Theisen, C, Verney, D & Z̈ylicz, J 2003, 'Low energy levels in ⁷²Ni', Physical Review C - Nuclear Physics, vol. 68, no. 4, 044304, pp. 443041-443046. https://doi.org/10.1103/PhysRevC.68.044304

TY - JOUR

T1 - Low energy levels in 72Ni

AU - Sawicka, M.

AU - Grzywacz, R.

AU - Matea, I.

AU - Grawe, H.

AU - Pfützner, M.

AU - Daugas, J. M.

AU - Lewitowicz, M.

AU - Balabanski, D. L.

AU - Becker, F.

AU - Bélier, G.

AU - Bingham, C.

AU - Borcea, C.

AU - Bouchez, E.

AU - Buta, A.

AU - La Commara, M.

AU - Dragulescu, E.

AU - De France, G.

AU - Georgiev, G.

AU - Giovinazzo, J.

AU - Górska, M.

AU - Hammache, F.

AU - Hass, M.

AU - Hellström, M.

AU - Ibrahim, F.

AU - Janas, Z.

AU - Mach, H.

AU - Mayet, P.

AU - Méot, V.

AU - Negoita, F.

AU - Neyens, G.

AU - De Oliveira Santos, F.

AU - Page, R. D.

AU - Perru, O.

AU - Podolÿk, Zs

AU - Roig, O.

AU - Rykaczewski, K. P.

AU - Saint-Laurent, M. G.

AU - Sauvestre, J. E.

AU - Sorlin, O.

AU - Stanoiu, M.

AU - Stefan, I.

AU - Stodel, C.

AU - Theisen, Ch

AU - Verney, D.

AU - Z̈ylicz, J.

PY - 2003/10

Y1 - 2003/10

N2 - The yrast Jπ=8+ states in neutron-rich 70,72,74,76Ni nuclei are predicted to be isomeric. The present paper describes two GANIL experiments. In the first of them a search was made for the 8+ isomeric states in 72,74Ni nuclei via fragmentation of 76Ge using the ion γ-decay correlation technique. Although these states were not observed, limits for their lifetimes were determined. In the second experiment the decay spectroscopy of 70,72Co nuclei was performed using fragmentation of a 86Kr36- beam and the new LISE2000 spectrometer. The β delayed γ rays from the decay of 70,72Co to 70,72Ni were observed using the EXOGAM germanium detectors. The half life of 72Co was measured to be 62(3) ms and the level sequence of the lowest excited states in 72Ni was suggested, with the 2+ state at 1096 keV. An attempt to reproduce the level scheme in terms of shell-model calculations was undertaken. The reasons for the disappearance of the 8+ isomer in 72Ni are discussed.

AB - The yrast Jπ=8+ states in neutron-rich 70,72,74,76Ni nuclei are predicted to be isomeric. The present paper describes two GANIL experiments. In the first of them a search was made for the 8+ isomeric states in 72,74Ni nuclei via fragmentation of 76Ge using the ion γ-decay correlation technique. Although these states were not observed, limits for their lifetimes were determined. In the second experiment the decay spectroscopy of 70,72Co nuclei was performed using fragmentation of a 86Kr36- beam and the new LISE2000 spectrometer. The β delayed γ rays from the decay of 70,72Co to 70,72Ni were observed using the EXOGAM germanium detectors. The half life of 72Co was measured to be 62(3) ms and the level sequence of the lowest excited states in 72Ni was suggested, with the 2+ state at 1096 keV. An attempt to reproduce the level scheme in terms of shell-model calculations was undertaken. The reasons for the disappearance of the 8+ isomer in 72Ni are discussed.

UR - https://www.scopus.com/pages/publications/0347029757

U2 - 10.1103/PhysRevC.68.044304

DO - 10.1103/PhysRevC.68.044304

M3 - Article

AN - SCOPUS:0347029757

SN - 0556-2813

VL - 68

SP - 443041

EP - 443046

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 4

M1 - 044304

ER -

Low energy levels in ⁷²Ni

Abstract

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