New isotopes and isomers produced by the fragmentation of 238U at 1000 MeV/nucleon

M. Pfützner; P. Armbruster; T. Baumann; J. Benlliure; M. Bernas; W. N. Catford; D. Cortina-Gil; J. M. Daugas; H. Geissel; M. Górska; H. Grawe; R. Grzywacz; M. Hellström; N. Iwasa; Z. Janas; A. R. Junghans; M. Karny; S. Leenhardt; M. Lewitowicz; A. C. Mueller; F. De Oliviera; P. M. Regan; M. Rejmund; K. Rykaczewski; K. Sümmerer

doi:10.1016/S0370-2693(98)01332-X

New isotopes and isomers produced by the fragmentation of ²³⁸U at 1000 MeV/nucleon

M. Pfützner, P. Armbruster, T. Baumann, J. Benlliure, M. Bernas, W. N. Catford, D. Cortina-Gil, J. M. Daugas, H. Geissel, M. Górska, H. Grawe, R. Grzywacz, M. Hellström, N. Iwasa, Z. Janas, A. R. Junghans, M. Karny, S. Leenhardt, M. Lewitowicz, A. C. MuellerF. De Oliviera, P. M. Regan, M. Rejmund, K. Rykaczewski, K. Sümmerer

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Abstract

Seven previously unobserved neutron-rich isotopes (²⁰⁹Hg, ²¹⁰Hg, ²¹¹Tl, ²¹²Tl, ²¹⁸Bi, ²¹⁹Po and ²²⁰Po) have been identified among the fragmentation products of a 1000 MeV/nucleon ²³⁸U beam incident on a beryllium target. The γ-ray decays of 9 known and 4 new μs-isomers in nuclei around ²⁰⁸Pb were also observed. Production cross sections and probabilities for populating isomeric states in the fragmentation reaction were determined and compared with a simple model based on the statistical abrasion-ablation approach.

Original language	English
Pages (from-to)	32-37
Number of pages	6
Journal	Physics Letters B
Volume	444
Issue number	1-2
DOIs	https://doi.org/10.1016/S0370-2693(98)01332-X
State	Published - Dec 17 1998

Funding

We thank Dr C. Baktash of Oak Ridge National Lab for providing a Clover-type Ge detector. One of us (M.P.) would like to express his gratitude for the hospitality and excellent working conditions during his stay in GSI. This work was partially supported by the Polish Committee of Scientific Research under grant KBN 2 P03B 036 15. M.G. is a scholar of the Foundation for Polish Science.

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Pfützner, M., Armbruster, P., Baumann, T., Benlliure, J., Bernas, M., Catford, W. N., Cortina-Gil, D., Daugas, J. M., Geissel, H., Górska, M., Grawe, H., Grzywacz, R., Hellström, M., Iwasa, N., Janas, Z., Junghans, A. R., Karny, M., Leenhardt, S., Lewitowicz, M., ... Sümmerer, K. (1998). New isotopes and isomers produced by the fragmentation of ²³⁸U at 1000 MeV/nucleon. Physics Letters B, 444(1-2), 32-37. https://doi.org/10.1016/S0370-2693(98)01332-X

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title = "New isotopes and isomers produced by the fragmentation of 238U at 1000 MeV/nucleon",

abstract = "Seven previously unobserved neutron-rich isotopes (209Hg, 210Hg, 211Tl, 212Tl, 218Bi, 219Po and 220Po) have been identified among the fragmentation products of a 1000 MeV/nucleon 238U beam incident on a beryllium target. The γ-ray decays of 9 known and 4 new μs-isomers in nuclei around 208Pb were also observed. Production cross sections and probabilities for populating isomeric states in the fragmentation reaction were determined and compared with a simple model based on the statistical abrasion-ablation approach.",

author = "M. Pf{\"u}tzner and P. Armbruster and T. Baumann and J. Benlliure and M. Bernas and Catford, {W. N.} and D. Cortina-Gil and Daugas, {J. M.} and H. Geissel and M. G{\'o}rska and H. Grawe and R. Grzywacz and M. Hellstr{\"o}m and N. Iwasa and Z. Janas and Junghans, {A. R.} and M. Karny and S. Leenhardt and M. Lewitowicz and Mueller, {A. C.} and {De Oliviera}, F. and Regan, {P. M.} and M. Rejmund and K. Rykaczewski and K. S{\"u}mmerer",

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doi = "10.1016/S0370-2693(98)01332-X",

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Pfützner, M, Armbruster, P, Baumann, T, Benlliure, J, Bernas, M, Catford, WN, Cortina-Gil, D, Daugas, JM, Geissel, H, Górska, M, Grawe, H, Grzywacz, R, Hellström, M, Iwasa, N, Janas, Z, Junghans, AR, Karny, M, Leenhardt, S, Lewitowicz, M, Mueller, AC, De Oliviera, F, Regan, PM, Rejmund, M, Rykaczewski, K & Sümmerer, K 1998, 'New isotopes and isomers produced by the fragmentation of ²³⁸U at 1000 MeV/nucleon', Physics Letters B, vol. 444, no. 1-2, pp. 32-37. https://doi.org/10.1016/S0370-2693(98)01332-X

TY - JOUR

T1 - New isotopes and isomers produced by the fragmentation of 238U at 1000 MeV/nucleon

AU - Pfützner, M.

AU - Armbruster, P.

AU - Baumann, T.

AU - Benlliure, J.

AU - Bernas, M.

AU - Catford, W. N.

AU - Cortina-Gil, D.

AU - Daugas, J. M.

AU - Geissel, H.

AU - Górska, M.

AU - Grawe, H.

AU - Grzywacz, R.

AU - Hellström, M.

AU - Iwasa, N.

AU - Janas, Z.

AU - Junghans, A. R.

AU - Karny, M.

AU - Leenhardt, S.

AU - Lewitowicz, M.

AU - Mueller, A. C.

AU - De Oliviera, F.

AU - Regan, P. M.

AU - Rejmund, M.

AU - Rykaczewski, K.

AU - Sümmerer, K.

PY - 1998/12/17

Y1 - 1998/12/17

N2 - Seven previously unobserved neutron-rich isotopes (209Hg, 210Hg, 211Tl, 212Tl, 218Bi, 219Po and 220Po) have been identified among the fragmentation products of a 1000 MeV/nucleon 238U beam incident on a beryllium target. The γ-ray decays of 9 known and 4 new μs-isomers in nuclei around 208Pb were also observed. Production cross sections and probabilities for populating isomeric states in the fragmentation reaction were determined and compared with a simple model based on the statistical abrasion-ablation approach.

AB - Seven previously unobserved neutron-rich isotopes (209Hg, 210Hg, 211Tl, 212Tl, 218Bi, 219Po and 220Po) have been identified among the fragmentation products of a 1000 MeV/nucleon 238U beam incident on a beryllium target. The γ-ray decays of 9 known and 4 new μs-isomers in nuclei around 208Pb were also observed. Production cross sections and probabilities for populating isomeric states in the fragmentation reaction were determined and compared with a simple model based on the statistical abrasion-ablation approach.

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SN - 0370-2693

VL - 444

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EP - 37

JO - Physics Letters B

JF - Physics Letters B

IS - 1-2

ER -

New isotopes and isomers produced by the fragmentation of ²³⁸U at 1000 MeV/nucleon

Abstract

Funding

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