beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes

N. Alkhomashi; P. H. Regan; Zs. Podolyak; S. Pietri; A. B. Garnsworthy; S. J. Steer; J. Benlliure; E. Caserejos; R. F. Casten; J. Gerl; H. J. Wollersheim; J. Grebosz; G. Farrelly; M. Gorska; I. Kojouharov; H. Schaffner; A. Algora; G. Benzoni; A. Blazhev; P. Boutachkov; A. M. Bruce; A. M. Denis Bacelar; I. J. Cullen; L. Caceres; P. Doornenbal; M. E. Estevez; Y. Fujita; W. Gelletly; Robert Hoischen; R. Kumar; N. Kurz; S. Lalkovski; Z. Liu; C. Mihai; F. Molina; A. I. Morales; D. Muecher; W. Prokopowicz; B. Rubio; Y. Shi; A. Tamii; S. Tashenov; J. J. Valiente-Dobon; P. M. Walker; P. J. Woods; F. R. Xu

doi:10.1103/PhysRevC.80.064308

beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes

N. Alkhomashi, P. H. Regan, Zs. Podolyak, S. Pietri, A. B. Garnsworthy, S. J. Steer, J. Benlliure, E. Caserejos, R. F. Casten, J. Gerl, H. J. Wollersheim, J. Grebosz, G. Farrelly, M. Gorska, I. Kojouharov, H. Schaffner, A. Algora, G. Benzoni, A. Blazhev, P. BoutachkovA. M. Bruce, A. M. Denis Bacelar, I. J. Cullen, L. Caceres, P. Doornenbal, M. E. Estevez, Y. Fujita, W. Gelletly, Robert Hoischen, R. Kumar, N. Kurz, S. Lalkovski, Z. Liu, C. Mihai, F. Molina, A. I. Morales, D. Muecher, W. Prokopowicz, B. Rubio, Y. Shi, A. Tamii, S. Tashenov, J. J. Valiente-Dobon, P. M. Walker, P. J. Woods, F. R. Xu

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Abstract

The low-lying structure of W-188,W-190,W-192 has been studied following beta decays of the neutron-rich mother nuclei Ta-188,Ta-190,Ta-192 produced following the projectile fragmentation of a 1-GeV-per-nucleon Pb-208 primary beam on a natural beryllium target at the GSI Fragment Separator. The beta-decay half-lives of Ta-188, Ta-190, and Ta-192 have been measured, with gamma-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ion beta-gamma correlations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in W-188, W-190, and W-192, which highlight a change in nuclear shape at W-190 compared with that of lighter W isotopes. This evolution of ground-state structure along the W isotopic chain is discussed as evidence for a possible proton subshell effect for the A similar to 190 region and is consistent with maximization of the gamma-softness of the nuclear potential around N similar to 116.

Original language	English
Journal	Physical Review C (Nuclear Physics)
Volume	80
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.80.064308
Publication status	Published - 2009

Subject classification (UKÄ)

Subatomic Physics

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10.1103/PhysRevC.80.064308

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Alkhomashi, N., Regan, P. H., Podolyak, Z., Pietri, S., Garnsworthy, A. B., Steer, S. J., Benlliure, J., Caserejos, E., Casten, R. F., Gerl, J., Wollersheim, H. J., Grebosz, J., Farrelly, G., Gorska, M., Kojouharov, I., Schaffner, H., Algora, A., Benzoni, G., Blazhev, A., ... Xu, F. R. (2009). beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes. Physical Review C (Nuclear Physics), 80(6). https://doi.org/10.1103/PhysRevC.80.064308

@article{54947fbbe95a4a51a9fd7c24ca89a390,

title = "beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes",

abstract = "The low-lying structure of W-188,W-190,W-192 has been studied following beta decays of the neutron-rich mother nuclei Ta-188,Ta-190,Ta-192 produced following the projectile fragmentation of a 1-GeV-per-nucleon Pb-208 primary beam on a natural beryllium target at the GSI Fragment Separator. The beta-decay half-lives of Ta-188, Ta-190, and Ta-192 have been measured, with gamma-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ion beta-gamma correlations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in W-188, W-190, and W-192, which highlight a change in nuclear shape at W-190 compared with that of lighter W isotopes. This evolution of ground-state structure along the W isotopic chain is discussed as evidence for a possible proton subshell effect for the A similar to 190 region and is consistent with maximization of the gamma-softness of the nuclear potential around N similar to 116.",

author = "N. Alkhomashi and Regan, {P. H.} and Zs. Podolyak and S. Pietri and Garnsworthy, {A. B.} and Steer, {S. J.} and J. Benlliure and E. Caserejos and Casten, {R. F.} and J. Gerl and Wollersheim, {H. J.} and J. Grebosz and G. Farrelly and M. Gorska and I. Kojouharov and H. Schaffner and A. Algora and G. Benzoni and A. Blazhev and P. Boutachkov and Bruce, {A. M.} and Bacelar, {A. M. Denis} and Cullen, {I. J.} and L. Caceres and P. Doornenbal and Estevez, {M. E.} and Y. Fujita and W. Gelletly and Robert Hoischen and R. Kumar and N. Kurz and S. Lalkovski and Z. Liu and C. Mihai and F. Molina and Morales, {A. I.} and D. Muecher and W. Prokopowicz and B. Rubio and Y. Shi and A. Tamii and S. Tashenov and Valiente-Dobon, {J. J.} and Walker, {P. M.} and Woods, {P. J.} and Xu, {F. R.}",

year = "2009",

doi = "10.1103/PhysRevC.80.064308",

language = "English",

volume = "80",

journal = "Physical Review C (Nuclear Physics)",

issn = "0556-2813",

publisher = "American Physical Society",

number = "6",

}

Alkhomashi, N, Regan, PH, Podolyak, Z, Pietri, S, Garnsworthy, AB, Steer, SJ, Benlliure, J, Caserejos, E, Casten, RF, Gerl, J, Wollersheim, HJ, Grebosz, J, Farrelly, G, Gorska, M, Kojouharov, I, Schaffner, H, Algora, A, Benzoni, G, Blazhev, A, Boutachkov, P, Bruce, AM, Bacelar, AMD, Cullen, IJ, Caceres, L, Doornenbal, P, Estevez, ME, Fujita, Y, Gelletly, W, Hoischen, R, Kumar, R, Kurz, N, Lalkovski, S, Liu, Z, Mihai, C, Molina, F, Morales, AI, Muecher, D, Prokopowicz, W, Rubio, B, Shi, Y, Tamii, A, Tashenov, S, Valiente-Dobon, JJ, Walker, PM, Woods, PJ & Xu, FR 2009, 'beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes', Physical Review C (Nuclear Physics), vol. 80, no. 6. https://doi.org/10.1103/PhysRevC.80.064308

TY - JOUR

T1 - beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes

AU - Alkhomashi, N.

AU - Regan, P. H.

AU - Podolyak, Zs.

AU - Pietri, S.

AU - Garnsworthy, A. B.

AU - Steer, S. J.

AU - Benlliure, J.

AU - Caserejos, E.

AU - Casten, R. F.

AU - Gerl, J.

AU - Wollersheim, H. J.

AU - Grebosz, J.

AU - Farrelly, G.

AU - Gorska, M.

AU - Kojouharov, I.

AU - Schaffner, H.

AU - Algora, A.

AU - Benzoni, G.

AU - Blazhev, A.

AU - Boutachkov, P.

AU - Bruce, A. M.

AU - Bacelar, A. M. Denis

AU - Cullen, I. J.

AU - Caceres, L.

AU - Doornenbal, P.

AU - Estevez, M. E.

AU - Fujita, Y.

AU - Gelletly, W.

AU - Hoischen, Robert

AU - Kumar, R.

AU - Kurz, N.

AU - Lalkovski, S.

AU - Liu, Z.

AU - Mihai, C.

AU - Molina, F.

AU - Morales, A. I.

AU - Muecher, D.

AU - Prokopowicz, W.

AU - Rubio, B.

AU - Shi, Y.

AU - Tamii, A.

AU - Tashenov, S.

AU - Valiente-Dobon, J. J.

AU - Walker, P. M.

AU - Woods, P. J.

AU - Xu, F. R.

PY - 2009

Y1 - 2009

N2 - The low-lying structure of W-188,W-190,W-192 has been studied following beta decays of the neutron-rich mother nuclei Ta-188,Ta-190,Ta-192 produced following the projectile fragmentation of a 1-GeV-per-nucleon Pb-208 primary beam on a natural beryllium target at the GSI Fragment Separator. The beta-decay half-lives of Ta-188, Ta-190, and Ta-192 have been measured, with gamma-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ion beta-gamma correlations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in W-188, W-190, and W-192, which highlight a change in nuclear shape at W-190 compared with that of lighter W isotopes. This evolution of ground-state structure along the W isotopic chain is discussed as evidence for a possible proton subshell effect for the A similar to 190 region and is consistent with maximization of the gamma-softness of the nuclear potential around N similar to 116.

AB - The low-lying structure of W-188,W-190,W-192 has been studied following beta decays of the neutron-rich mother nuclei Ta-188,Ta-190,Ta-192 produced following the projectile fragmentation of a 1-GeV-per-nucleon Pb-208 primary beam on a natural beryllium target at the GSI Fragment Separator. The beta-decay half-lives of Ta-188, Ta-190, and Ta-192 have been measured, with gamma-ray decays of low-lying states in their respective W daughter nuclei, using heavy-ion beta-gamma correlations and a position-sensitive silicon detector setup. The data provide information on the low-lying excited states in W-188, W-190, and W-192, which highlight a change in nuclear shape at W-190 compared with that of lighter W isotopes. This evolution of ground-state structure along the W isotopic chain is discussed as evidence for a possible proton subshell effect for the A similar to 190 region and is consistent with maximization of the gamma-softness of the nuclear potential around N similar to 116.

U2 - 10.1103/PhysRevC.80.064308

DO - 10.1103/PhysRevC.80.064308

M3 - Article

SN - 0556-2813

VL - 80

JO - Physical Review C (Nuclear Physics)

JF - Physical Review C (Nuclear Physics)

IS - 6

ER -

beta(-)-delayed spectroscopy of neutron-rich tantalum nuclei: Shape evolution in neutron-rich tungsten isotopes

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