New half-lives of r-process Zn and Ga isotopes measured with electromagnetic separation

M. Madurga; R. Surman; I. N. Borzov; R. Grzywacz; K. P. Rykaczewski; C. J. Gross; D. Miller; D. W. Stracener; J. C. Batchelder; N. T. Brewer; L. Cartegni; J. H. Hamilton; J. K. Hwang; S. H. Liu; S. V. Ilyushkin; C. Jost; M. Karny; A. Korgul; W. Królas; A. Kuniak; C. Mazzocchi; A. J. Mendez; K. Miernik; S. W. Padgett; S. V. Paulauskas; A. V. Ramayya; J. A. Winger; M. Wolińska-Cichocka; E. F. Zganjar

doi:10.1103/PhysRevLett.109.112501

New half-lives of r-process Zn and Ga isotopes measured with electromagnetic separation

M. Madurga, R. Surman, I. N. Borzov, R. Grzywacz, K. P. Rykaczewski, C. J. Gross, D. Miller, D. W. Stracener, J. C. Batchelder, N. T. Brewer, L. Cartegni, J. H. Hamilton, J. K. Hwang, S. H. Liu, S. V. Ilyushkin, C. Jost, M. Karny, A. Korgul, W. Królas, A. KuniakC. Mazzocchi, A. J. Mendez, K. Miernik, S. W. Padgett, S. V. Paulauskas, A. V. Ramayya, J. A. Winger, M. Wolińska-Cichocka, E. F. Zganjar

Medical Isotopes and Development

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Abstract

The β decays of neutron-rich nuclei near the doubly magic Ni78 were studied at the Holifield Radioactive Ion Beam Facility using an electromagnetic isobar separator. The half-lives of Zn82 (228±10ms), Zn83 (117±20ms), and Ga85 (93±7ms) were determined for the first time. These half-lives were found to be very different from the predictions of the global model used in astrophysical simulations. A new calculation was developed using the density functional model, which properly reproduced the new experimental values. The robustness of the new model in the Ni78 region allowed us to extrapolate data for more neutron-rich isotopes. The revised analysis of the rapid neutron capture process in low entropy environments with our new set of measured and calculated half-lives shows a significant redistribution of predicted isobaric abundances strengthening the yield of A>140 nuclei.

Original language	English
Article number	112501
Journal	Physical Review Letters
Volume	109
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.109.112501
State	Published - Sep 13 2012

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Madurga, M., Surman, R., Borzov, I. N., Grzywacz, R., Rykaczewski, K. P., Gross, C. J., Miller, D., Stracener, D. W., Batchelder, J. C., Brewer, N. T., Cartegni, L., Hamilton, J. H., Hwang, J. K., Liu, S. H., Ilyushkin, S. V., Jost, C., Karny, M., Korgul, A., Królas, W., ... Zganjar, E. F. (2012). New half-lives of r-process Zn and Ga isotopes measured with electromagnetic separation. Physical Review Letters, 109(11), Article 112501. https://doi.org/10.1103/PhysRevLett.109.112501

@article{76b030451fe74e4a8e973e5ff24c3fea,

title = "New half-lives of r-process Zn and Ga isotopes measured with electromagnetic separation",

abstract = "The β decays of neutron-rich nuclei near the doubly magic Ni78 were studied at the Holifield Radioactive Ion Beam Facility using an electromagnetic isobar separator. The half-lives of Zn82 (228±10ms), Zn83 (117±20ms), and Ga85 (93±7ms) were determined for the first time. These half-lives were found to be very different from the predictions of the global model used in astrophysical simulations. A new calculation was developed using the density functional model, which properly reproduced the new experimental values. The robustness of the new model in the Ni78 region allowed us to extrapolate data for more neutron-rich isotopes. The revised analysis of the rapid neutron capture process in low entropy environments with our new set of measured and calculated half-lives shows a significant redistribution of predicted isobaric abundances strengthening the yield of A>140 nuclei.",

author = "M. Madurga and R. Surman and Borzov, {I. N.} and R. Grzywacz and Rykaczewski, {K. P.} and Gross, {C. J.} and D. Miller and Stracener, {D. W.} and Batchelder, {J. C.} and Brewer, {N. T.} and L. Cartegni and Hamilton, {J. H.} and Hwang, {J. K.} and Liu, {S. H.} and Ilyushkin, {S. V.} and C. Jost and M. Karny and A. Korgul and W. Kr{\'o}las and A. Kuniak and C. Mazzocchi and Mendez, {A. J.} and K. Miernik and Padgett, {S. W.} and Paulauskas, {S. V.} and Ramayya, {A. V.} and Winger, {J. A.} and M. Woli{\'n}ska-Cichocka and Zganjar, {E. F.}",

year = "2012",

month = sep,

day = "13",

doi = "10.1103/PhysRevLett.109.112501",

language = "English",

volume = "109",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "11",

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Madurga, M, Surman, R, Borzov, IN, Grzywacz, R, Rykaczewski, KP, Gross, CJ, Miller, D, Stracener, DW, Batchelder, JC, Brewer, NT, Cartegni, L, Hamilton, JH, Hwang, JK, Liu, SH, Ilyushkin, SV, Jost, C, Karny, M, Korgul, A, Królas, W, Kuniak, A, Mazzocchi, C, Mendez, AJ, Miernik, K, Padgett, SW, Paulauskas, SV, Ramayya, AV, Winger, JA, Wolińska-Cichocka, M & Zganjar, EF 2012, 'New half-lives of r-process Zn and Ga isotopes measured with electromagnetic separation', Physical Review Letters, vol. 109, no. 11, 112501. https://doi.org/10.1103/PhysRevLett.109.112501

TY - JOUR

T1 - New half-lives of r-process Zn and Ga isotopes measured with electromagnetic separation

AU - Madurga, M.

AU - Surman, R.

AU - Borzov, I. N.

AU - Grzywacz, R.

AU - Rykaczewski, K. P.

AU - Gross, C. J.

AU - Miller, D.

AU - Stracener, D. W.

AU - Batchelder, J. C.

AU - Brewer, N. T.

AU - Cartegni, L.

AU - Hamilton, J. H.

AU - Hwang, J. K.

AU - Liu, S. H.

AU - Ilyushkin, S. V.

AU - Jost, C.

AU - Karny, M.

AU - Korgul, A.

AU - Królas, W.

AU - Kuniak, A.

AU - Mazzocchi, C.

AU - Mendez, A. J.

AU - Miernik, K.

AU - Padgett, S. W.

AU - Paulauskas, S. V.

AU - Ramayya, A. V.

AU - Winger, J. A.

AU - Wolińska-Cichocka, M.

AU - Zganjar, E. F.

PY - 2012/9/13

Y1 - 2012/9/13

N2 - The β decays of neutron-rich nuclei near the doubly magic Ni78 were studied at the Holifield Radioactive Ion Beam Facility using an electromagnetic isobar separator. The half-lives of Zn82 (228±10ms), Zn83 (117±20ms), and Ga85 (93±7ms) were determined for the first time. These half-lives were found to be very different from the predictions of the global model used in astrophysical simulations. A new calculation was developed using the density functional model, which properly reproduced the new experimental values. The robustness of the new model in the Ni78 region allowed us to extrapolate data for more neutron-rich isotopes. The revised analysis of the rapid neutron capture process in low entropy environments with our new set of measured and calculated half-lives shows a significant redistribution of predicted isobaric abundances strengthening the yield of A>140 nuclei.

AB - The β decays of neutron-rich nuclei near the doubly magic Ni78 were studied at the Holifield Radioactive Ion Beam Facility using an electromagnetic isobar separator. The half-lives of Zn82 (228±10ms), Zn83 (117±20ms), and Ga85 (93±7ms) were determined for the first time. These half-lives were found to be very different from the predictions of the global model used in astrophysical simulations. A new calculation was developed using the density functional model, which properly reproduced the new experimental values. The robustness of the new model in the Ni78 region allowed us to extrapolate data for more neutron-rich isotopes. The revised analysis of the rapid neutron capture process in low entropy environments with our new set of measured and calculated half-lives shows a significant redistribution of predicted isobaric abundances strengthening the yield of A>140 nuclei.

UR - http://www.scopus.com/inward/record.url?scp=84866333921&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.109.112501

DO - 10.1103/PhysRevLett.109.112501

M3 - Article

AN - SCOPUS:84866333921

SN - 0031-9007

VL - 109

JO - Physical Review Letters

JF - Physical Review Letters

IS - 11

M1 - 112501

ER -

New half-lives of r-process Zn and Ga isotopes measured with electromagnetic separation

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