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Title: Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf 254

Abstract

Two isomers decaying by electromagnetic transitions with half-lives of 4.7(1.1) and 247 ( 73 ) μ s have been discovered in the heavy 254 Rf nucleus. The observation of the shorter-lived isomer was made possible by a novel application of a digital data acquisition system. The isomers were interpreted as the K π = 8 - , ν 2 ( 7 / 2 + [ 624 ] , 9 / 2 - [ 734 ] ) two-quasineutron and the K π = 1 6 + , 8 - ν 2 ( 7 / 2 + [ 624 ] , 9 / 2 - [ 734 ] ) Ⓧ 8 - π 2 ( 7 / 2 -[ 514 ] , 9 / 2 + [ 624 ] ) four-quasiparticle configurations, respectively. Surprisingly, the lifetime of the two-quasiparticle isomer is more than 4 orders of magnitude shorter than what has been observed for analogous isomers in the lighter N = 150 isotones. The four-quasiparticle isomer is longer lived than the 254 Rf ground state that decays exclusively by spontaneous fission with a half-life of 23.2 ( 1.1 ) μ s . The absence of sizable fission branches from either of themore » isomers implies unprecedented fission hindrance relative to the ground state.« less

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1391944
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 13; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

David, H. M., Chen, J., Seweryniak, D., Kondev, F. G., Gates, J. M., Gregorich, K. E., Ahmad, I., Albers, M., Alcorta, M., Back, B. B., Baartman, B., Bertone, P. F., Bernstein, L. A., Campbell, C. M., Carpenter, M. P., Chiara, C. J., Clark, R. M., Cromaz, M., Doherty, D. T., Dracoulis, G. D., Esker, N. E., Fallon, P., Gothe, O. R., Greene, J. P., Greenlees, P. T., Hartley, D. J., Hauschild, K., Hoffman, C. R., Hota, S. S., Janssens, R. V. F., Khoo, T. L., Konki, J., Kwarsick, J. T., Lauritsen, T., Macchiavelli, A. O., Mudder, P. R., Nair, C., Qiu, Y., Rissanen, J., Rogers, A. M., Ruotsalainen, P., Savard, G., Stolze, S., Wiens, A., and Zhu, S. Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf254. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.115.132502.
David, H. M., Chen, J., Seweryniak, D., Kondev, F. G., Gates, J. M., Gregorich, K. E., Ahmad, I., Albers, M., Alcorta, M., Back, B. B., Baartman, B., Bertone, P. F., Bernstein, L. A., Campbell, C. M., Carpenter, M. P., Chiara, C. J., Clark, R. M., Cromaz, M., Doherty, D. T., Dracoulis, G. D., Esker, N. E., Fallon, P., Gothe, O. R., Greene, J. P., Greenlees, P. T., Hartley, D. J., Hauschild, K., Hoffman, C. R., Hota, S. S., Janssens, R. V. F., Khoo, T. L., Konki, J., Kwarsick, J. T., Lauritsen, T., Macchiavelli, A. O., Mudder, P. R., Nair, C., Qiu, Y., Rissanen, J., Rogers, A. M., Ruotsalainen, P., Savard, G., Stolze, S., Wiens, A., & Zhu, S. Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf254. United States. doi:10.1103/PhysRevLett.115.132502.
David, H. M., Chen, J., Seweryniak, D., Kondev, F. G., Gates, J. M., Gregorich, K. E., Ahmad, I., Albers, M., Alcorta, M., Back, B. B., Baartman, B., Bertone, P. F., Bernstein, L. A., Campbell, C. M., Carpenter, M. P., Chiara, C. J., Clark, R. M., Cromaz, M., Doherty, D. T., Dracoulis, G. D., Esker, N. E., Fallon, P., Gothe, O. R., Greene, J. P., Greenlees, P. T., Hartley, D. J., Hauschild, K., Hoffman, C. R., Hota, S. S., Janssens, R. V. F., Khoo, T. L., Konki, J., Kwarsick, J. T., Lauritsen, T., Macchiavelli, A. O., Mudder, P. R., Nair, C., Qiu, Y., Rissanen, J., Rogers, A. M., Ruotsalainen, P., Savard, G., Stolze, S., Wiens, A., and Zhu, S. Tue . "Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf254". United States. doi:10.1103/PhysRevLett.115.132502.
@article{osti_1391944,
title = {Decay and Fission Hindrance of Two- and Four-Quasiparticle K Isomers in Rf254},
author = {David, H. M. and Chen, J. and Seweryniak, D. and Kondev, F. G. and Gates, J. M. and Gregorich, K. E. and Ahmad, I. and Albers, M. and Alcorta, M. and Back, B. B. and Baartman, B. and Bertone, P. F. and Bernstein, L. A. and Campbell, C. M. and Carpenter, M. P. and Chiara, C. J. and Clark, R. M. and Cromaz, M. and Doherty, D. T. and Dracoulis, G. D. and Esker, N. E. and Fallon, P. and Gothe, O. R. and Greene, J. P. and Greenlees, P. T. and Hartley, D. J. and Hauschild, K. and Hoffman, C. R. and Hota, S. S. and Janssens, R. V. F. and Khoo, T. L. and Konki, J. and Kwarsick, J. T. and Lauritsen, T. and Macchiavelli, A. O. and Mudder, P. R. and Nair, C. and Qiu, Y. and Rissanen, J. and Rogers, A. M. and Ruotsalainen, P. and Savard, G. and Stolze, S. and Wiens, A. and Zhu, S.},
abstractNote = {Two isomers decaying by electromagnetic transitions with half-lives of 4.7(1.1) and 247 ( 73 ) μ s have been discovered in the heavy 254 Rf nucleus. The observation of the shorter-lived isomer was made possible by a novel application of a digital data acquisition system. The isomers were interpreted as the K π = 8 - , ν 2 ( 7 / 2 + [ 624 ] , 9 / 2 - [ 734 ] ) two-quasineutron and the K π = 1 6 + , 8 - ν 2 ( 7 / 2 + [ 624 ] , 9 / 2 - [ 734 ] ) Ⓧ 8 - π 2 ( 7 / 2 -[ 514 ] , 9 / 2 + [ 624 ] ) four-quasiparticle configurations, respectively. Surprisingly, the lifetime of the two-quasiparticle isomer is more than 4 orders of magnitude shorter than what has been observed for analogous isomers in the lighter N = 150 isotones. The four-quasiparticle isomer is longer lived than the 254 Rf ground state that decays exclusively by spontaneous fission with a half-life of 23.2 ( 1.1 ) μ s . The absence of sizable fission branches from either of the isomers implies unprecedented fission hindrance relative to the ground state.},
doi = {10.1103/PhysRevLett.115.132502},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 13,
volume = 115,
place = {United States},
year = {2015},
month = {9}
}

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