Direct observation of long-lived isomers in Bi212

L. Chen; P. M. Walker; H. Geissel; Yu A. Litvinov; K. Beckert; P. Beller; F. Bosch; D. Boutin; L. Caceres; J. J. Carroll; D. M. Cullen; I. J. Cullen; B. Franzke; J. Gerl; M. Górska; G. A. Jones; A. Kishada; R. Knöbel; C. Kozhuharov; J. Kurcewicz; S. A. Litvinov; Z. Liu; S. Mandal; F. Montes; G. Münzenberg; F. Nolden; T. Ohtsubo; Z. Patyk; W. R. Plaß; Zs Podolyák; S. Rigby; N. Saito; T. Saito; C. Scheidenberger; E. C. Simpson; M. Shindo; M. Steck; B. Sun; S. J. Williams; H. Weick; M. Winkler; H. J. Wollersheim; T. Yamaguchi

doi:10.1103/PhysRevLett.110.122502

Direct observation of long-lived isomers in Bi212

L. Chen^*, P. M. Walker, H. Geissel, Yu A. Litvinov, K. Beckert, P. Beller, F. Bosch, D. Boutin, L. Caceres, J. J. Carroll, D. M. Cullen, I. J. Cullen, B. Franzke, J. Gerl, M. Górska, G. A. Jones, A. Kishada, R. Knöbel, C. Kozhuharov, J. KurcewiczS. A. Litvinov, Z. Liu, S. Mandal, F. Montes, G. Münzenberg, F. Nolden, T. Ohtsubo, Z. Patyk, W. R. Plaß, Zs Podolyák, S. Rigby, N. Saito, T. Saito, C. Scheidenberger, E. C. Simpson, M. Shindo, M. Steck, B. Sun, S. J. Williams, H. Weick, M. Winkler, H. J. Wollersheim, T. Yamaguchi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Long-lived isomers in Bi212 have been studied following U238 projectile fragmentation at 670 MeV per nucleon. The fragmentation products were injected as highly charged ions into a storage ring, giving access to masses and half-lives. While the excitation energy of the first isomer of Bi212 was confirmed, the second isomer was observed at 1478(30) keV, in contrast to the previously accepted value of >1910 keV. It was also found to have an extended Lorentz-corrected in-ring half-life >30 min, compared to 7.0(3) min for the neutral atom. Both the energy and half-life differences can be understood as being due a substantial, though previously unrecognized, internal decay branch for neutral atoms. Earlier shell-model calculations are now found to give good agreement with the isomer excitation energy. Furthermore, these and new calculations predict the existence of states at slightly higher energy that could facilitate isomer deexcitation studies.

Original language	English
Article number	122502
Journal	Physical Review Letters
Volume	110
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.110.122502
Publication status	Published - 19 Mar 2013
Externally published	Yes

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Chen, L., Walker, P. M., Geissel, H., Litvinov, Y. A., Beckert, K., Beller, P., Bosch, F., Boutin, D., Caceres, L., Carroll, J. J., Cullen, D. M., Cullen, I. J., Franzke, B., Gerl, J., Górska, M., Jones, G. A., Kishada, A., Knöbel, R., Kozhuharov, C., ... Yamaguchi, T. (2013). Direct observation of long-lived isomers in Bi212. Physical Review Letters, 110(12), Article 122502. https://doi.org/10.1103/PhysRevLett.110.122502

@article{93106f18c8864fd0bdc779472d810445,

title = "Direct observation of long-lived isomers in Bi212",

abstract = "Long-lived isomers in Bi212 have been studied following U238 projectile fragmentation at 670 MeV per nucleon. The fragmentation products were injected as highly charged ions into a storage ring, giving access to masses and half-lives. While the excitation energy of the first isomer of Bi212 was confirmed, the second isomer was observed at 1478(30) keV, in contrast to the previously accepted value of >1910 keV. It was also found to have an extended Lorentz-corrected in-ring half-life >30 min, compared to 7.0(3) min for the neutral atom. Both the energy and half-life differences can be understood as being due a substantial, though previously unrecognized, internal decay branch for neutral atoms. Earlier shell-model calculations are now found to give good agreement with the isomer excitation energy. Furthermore, these and new calculations predict the existence of states at slightly higher energy that could facilitate isomer deexcitation studies.",

author = "L. Chen and Walker, {P. M.} and H. Geissel and Litvinov, {Yu A.} and K. Beckert and P. Beller and F. Bosch and D. Boutin and L. Caceres and Carroll, {J. J.} and Cullen, {D. M.} and Cullen, {I. J.} and B. Franzke and J. Gerl and M. G{\'o}rska and Jones, {G. A.} and A. Kishada and R. Kn{\"o}bel and C. Kozhuharov and J. Kurcewicz and Litvinov, {S. A.} and Z. Liu and S. Mandal and F. Montes and G. M{\"u}nzenberg and F. Nolden and T. Ohtsubo and Z. Patyk and Pla{\ss}, {W. R.} and Zs Podoly{\'a}k and S. Rigby and N. Saito and T. Saito and C. Scheidenberger and Simpson, {E. C.} and M. Shindo and M. Steck and B. Sun and Williams, {S. J.} and H. Weick and M. Winkler and Wollersheim, {H. J.} and T. Yamaguchi",

year = "2013",

month = mar,

day = "19",

doi = "10.1103/PhysRevLett.110.122502",

language = "English",

volume = "110",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "12",

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Chen, L, Walker, PM, Geissel, H, Litvinov, YA, Beckert, K, Beller, P, Bosch, F, Boutin, D, Caceres, L, Carroll, JJ, Cullen, DM, Cullen, IJ, Franzke, B, Gerl, J, Górska, M, Jones, GA, Kishada, A, Knöbel, R, Kozhuharov, C, Kurcewicz, J, Litvinov, SA, Liu, Z, Mandal, S, Montes, F, Münzenberg, G, Nolden, F, Ohtsubo, T, Patyk, Z, Plaß, WR, Podolyák, Z, Rigby, S, Saito, N, Saito, T, Scheidenberger, C, Simpson, EC, Shindo, M, Steck, M, Sun, B, Williams, SJ, Weick, H, Winkler, M, Wollersheim, HJ & Yamaguchi, T 2013, 'Direct observation of long-lived isomers in Bi212', Physical Review Letters, vol. 110, no. 12, 122502. https://doi.org/10.1103/PhysRevLett.110.122502

TY - JOUR

T1 - Direct observation of long-lived isomers in Bi212

AU - Chen, L.

AU - Walker, P. M.

AU - Geissel, H.

AU - Litvinov, Yu A.

AU - Beckert, K.

AU - Beller, P.

AU - Bosch, F.

AU - Boutin, D.

AU - Caceres, L.

AU - Carroll, J. J.

AU - Cullen, D. M.

AU - Cullen, I. J.

AU - Franzke, B.

AU - Gerl, J.

AU - Górska, M.

AU - Jones, G. A.

AU - Kishada, A.

AU - Knöbel, R.

AU - Kozhuharov, C.

AU - Kurcewicz, J.

AU - Litvinov, S. A.

AU - Liu, Z.

AU - Mandal, S.

AU - Montes, F.

AU - Münzenberg, G.

AU - Nolden, F.

AU - Ohtsubo, T.

AU - Patyk, Z.

AU - Plaß, W. R.

AU - Podolyák, Zs

AU - Rigby, S.

AU - Saito, N.

AU - Saito, T.

AU - Scheidenberger, C.

AU - Simpson, E. C.

AU - Shindo, M.

AU - Steck, M.

AU - Sun, B.

AU - Williams, S. J.

AU - Weick, H.

AU - Winkler, M.

AU - Wollersheim, H. J.

AU - Yamaguchi, T.

PY - 2013/3/19

Y1 - 2013/3/19

N2 - Long-lived isomers in Bi212 have been studied following U238 projectile fragmentation at 670 MeV per nucleon. The fragmentation products were injected as highly charged ions into a storage ring, giving access to masses and half-lives. While the excitation energy of the first isomer of Bi212 was confirmed, the second isomer was observed at 1478(30) keV, in contrast to the previously accepted value of >1910 keV. It was also found to have an extended Lorentz-corrected in-ring half-life >30 min, compared to 7.0(3) min for the neutral atom. Both the energy and half-life differences can be understood as being due a substantial, though previously unrecognized, internal decay branch for neutral atoms. Earlier shell-model calculations are now found to give good agreement with the isomer excitation energy. Furthermore, these and new calculations predict the existence of states at slightly higher energy that could facilitate isomer deexcitation studies.

AB - Long-lived isomers in Bi212 have been studied following U238 projectile fragmentation at 670 MeV per nucleon. The fragmentation products were injected as highly charged ions into a storage ring, giving access to masses and half-lives. While the excitation energy of the first isomer of Bi212 was confirmed, the second isomer was observed at 1478(30) keV, in contrast to the previously accepted value of >1910 keV. It was also found to have an extended Lorentz-corrected in-ring half-life >30 min, compared to 7.0(3) min for the neutral atom. Both the energy and half-life differences can be understood as being due a substantial, though previously unrecognized, internal decay branch for neutral atoms. Earlier shell-model calculations are now found to give good agreement with the isomer excitation energy. Furthermore, these and new calculations predict the existence of states at slightly higher energy that could facilitate isomer deexcitation studies.

UR - http://www.scopus.com/inward/record.url?scp=84875269021&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.110.122502

DO - 10.1103/PhysRevLett.110.122502

M3 - Article

SN - 0031-9007

VL - 110

JO - Physical Review Letters

JF - Physical Review Letters

IS - 12

M1 - 122502

ER -

Direct observation of long-lived isomers in Bi212

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