Configuration-dependent transition rates in 157Ho

J. Gascon; C. H. Yu; G. B. Hagemann; M. C. Carpenter; J. M. Espino; Y. Iwata; T. Komatsubara; J. Nyberg; S. Ogaza; G. Sletten; P. O. Tjøm; D. C. Radford; J. Simpson; A. Alderson; M. A. Bentley; P. Fallon; P. D. Forsyth; J. W. Roberts; J. F. Sharpey-Schafer

doi:10.1016/0375-9474(90)90102-R

Configuration-dependent transition rates in ¹⁵⁷Ho

J. Gascon, C. H. Yu, G. B. Hagemann, M. C. Carpenter, J. M. Espino, Y. Iwata, T. Komatsubara, J. Nyberg, S. Ogaza, G. Sletten, P. O. Tjøm, D. C. Radford, J. Simpson, A. Alderson, M. A. Bentley, P. Fallon, P. D. Forsyth, J. W. Roberts, J. F. Sharpey-Schafer

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

76 Scopus citations

Abstract

The lifetimes of the high-spin states of ¹⁵⁷Ho have been measured using the Doppler shift attenuation method (DSAM). The comparison of the observed shifts following the ¹²⁴Sn(³⁷Cl, 4n) reaction at a beam energy of 150 MeV, and the ¹⁴²Ce(¹⁹F, 4n) reaction at 85.5 MeV shows that the yrast states above spin 71 2^- are much less collective than the states below. Transition quadrupole moments were obtained for states from spin 45 2^- to 55 2^- h {combining short stroke overlay} in the yrast band, and from 37 2^- to 53 2^- h {combining short stroke overlay} in the third lowest negative-parity band. The difference in collectivity agrees with the assignment of these bands to a [523] 7 2^-(h_{11 2}) and a [541] 1 2^-(h_{9 2}) quasiproton excitation, respectively. However, it cannot explain the difference in the i_{13 2} neutron crossing frequencies of the two bands. The measured Q_t values for the [523] 7 2^- configuration are compared to those of other N = 90 isotones.

Original language	English
Pages (from-to)	344-372
Number of pages	29
Journal	Nuclear Physics A
Volume	513
Issue number	2
DOIs	https://doi.org/10.1016/0375-9474(90)90102-R
State	Published - Jul 2 1990
Externally published	Yes

Funding

Stimulating discussions with J.D. Garrett, I. Hamamoto and R. Wyss are acknowledged. This work was supported by the Danish Natural Science Foundation, the UK Science and Engineering Research Council, the European Economic Community Stimulation Programme (The ESSA30 Collaboration, contract number ST2J-0205), the NORDBALL Collaboration, The Nordic Council for Accelerator Based Research, The North Atlantic Treaty Organization (J.G.), the State Education Commission of China (C.-H. Y.), Commemoration Association for the Japan World Exposition, the Spanish Comision Interministerial de Ciencia y Tecnologia (CICYT), project number PB86-0318 (J.M.E.) and the Swedish Research Council (J.N.).

Funders	Funder number
Commemoration Association for the Japan World Exposition
European Economic Community Stimulation Programme	ST2J-0205
State Education Commission of China
North Atlantic Treaty Organization
Statens Naturvidenskabelige Forskningsrad
Vetenskapsrådet
Science and Engineering Research Council
Comisión Interministerial de Ciencia y Tecnología	PB86-0318

Keywords

Nuclear reaction

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/0375-9474(90)90102-R

Cite this

Gascon, J., Yu, C. H., Hagemann, G. B., Carpenter, M. C., Espino, J. M., Iwata, Y., Komatsubara, T., Nyberg, J., Ogaza, S., Sletten, G., Tjøm, P. O., Radford, D. C., Simpson, J., Alderson, A., Bentley, M. A., Fallon, P., Forsyth, P. D., Roberts, J. W., & Sharpey-Schafer, J. F. (1990). Configuration-dependent transition rates in ¹⁵⁷Ho. Nuclear Physics A, 513(2), 344-372. https://doi.org/10.1016/0375-9474(90)90102-R

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title = "Configuration-dependent transition rates in 157Ho",

abstract = "The lifetimes of the high-spin states of 157Ho have been measured using the Doppler shift attenuation method (DSAM). The comparison of the observed shifts following the 124Sn(37Cl, 4n) reaction at a beam energy of 150 MeV, and the 142Ce(19F, 4n) reaction at 85.5 MeV shows that the yrast states above spin 71 2- are much less collective than the states below. Transition quadrupole moments were obtained for states from spin 45 2- to 55 2- h {combining short stroke overlay} in the yrast band, and from 37 2- to 53 2- h {combining short stroke overlay} in the third lowest negative-parity band. The difference in collectivity agrees with the assignment of these bands to a [523] 7 2-(h 11 2) and a [541] 1 2-(h 9 2) quasiproton excitation, respectively. However, it cannot explain the difference in the i 13 2 neutron crossing frequencies of the two bands. The measured Qt values for the [523] 7 2- configuration are compared to those of other N = 90 isotones.",

keywords = "Nuclear reaction",

author = "J. Gascon and Yu, {C. H.} and Hagemann, {G. B.} and Carpenter, {M. C.} and Espino, {J. M.} and Y. Iwata and T. Komatsubara and J. Nyberg and S. Ogaza and G. Sletten and Tj{\o}m, {P. O.} and Radford, {D. C.} and J. Simpson and A. Alderson and Bentley, {M. A.} and P. Fallon and Forsyth, {P. D.} and Roberts, {J. W.} and Sharpey-Schafer, {J. F.}",

year = "1990",

month = jul,

day = "2",

doi = "10.1016/0375-9474(90)90102-R",

language = "English",

volume = "513",

pages = "344--372",

journal = "Nuclear Physics A",

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Gascon, J, Yu, CH, Hagemann, GB, Carpenter, MC, Espino, JM, Iwata, Y, Komatsubara, T, Nyberg, J, Ogaza, S, Sletten, G, Tjøm, PO, Radford, DC, Simpson, J, Alderson, A, Bentley, MA, Fallon, P, Forsyth, PD, Roberts, JW & Sharpey-Schafer, JF 1990, 'Configuration-dependent transition rates in ¹⁵⁷Ho', Nuclear Physics A, vol. 513, no. 2, pp. 344-372. https://doi.org/10.1016/0375-9474(90)90102-R

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T1 - Configuration-dependent transition rates in 157Ho

AU - Gascon, J.

AU - Yu, C. H.

AU - Hagemann, G. B.

AU - Carpenter, M. C.

AU - Espino, J. M.

AU - Iwata, Y.

AU - Komatsubara, T.

AU - Nyberg, J.

AU - Ogaza, S.

AU - Sletten, G.

AU - Tjøm, P. O.

AU - Radford, D. C.

AU - Simpson, J.

AU - Alderson, A.

AU - Bentley, M. A.

AU - Fallon, P.

AU - Forsyth, P. D.

AU - Roberts, J. W.

AU - Sharpey-Schafer, J. F.

PY - 1990/7/2

Y1 - 1990/7/2

N2 - The lifetimes of the high-spin states of 157Ho have been measured using the Doppler shift attenuation method (DSAM). The comparison of the observed shifts following the 124Sn(37Cl, 4n) reaction at a beam energy of 150 MeV, and the 142Ce(19F, 4n) reaction at 85.5 MeV shows that the yrast states above spin 71 2- are much less collective than the states below. Transition quadrupole moments were obtained for states from spin 45 2- to 55 2- h {combining short stroke overlay} in the yrast band, and from 37 2- to 53 2- h {combining short stroke overlay} in the third lowest negative-parity band. The difference in collectivity agrees with the assignment of these bands to a [523] 7 2-(h 11 2) and a [541] 1 2-(h 9 2) quasiproton excitation, respectively. However, it cannot explain the difference in the i 13 2 neutron crossing frequencies of the two bands. The measured Qt values for the [523] 7 2- configuration are compared to those of other N = 90 isotones.

AB - The lifetimes of the high-spin states of 157Ho have been measured using the Doppler shift attenuation method (DSAM). The comparison of the observed shifts following the 124Sn(37Cl, 4n) reaction at a beam energy of 150 MeV, and the 142Ce(19F, 4n) reaction at 85.5 MeV shows that the yrast states above spin 71 2- are much less collective than the states below. Transition quadrupole moments were obtained for states from spin 45 2- to 55 2- h {combining short stroke overlay} in the yrast band, and from 37 2- to 53 2- h {combining short stroke overlay} in the third lowest negative-parity band. The difference in collectivity agrees with the assignment of these bands to a [523] 7 2-(h 11 2) and a [541] 1 2-(h 9 2) quasiproton excitation, respectively. However, it cannot explain the difference in the i 13 2 neutron crossing frequencies of the two bands. The measured Qt values for the [523] 7 2- configuration are compared to those of other N = 90 isotones.

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DO - 10.1016/0375-9474(90)90102-R

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