Discovery of W-157 and Os-161

L. Bianco; R. D. Page; I. G. Darby; D. T. Joss; J. Simpson; J. J. Al-Khalili; A. J. Cannon; B. Cederwall; S. Eeckhaudt; S. Erturk; B. Gall; M. B. Gomez Hornillos; T. Grahn; P. T. Greenlees; B. Hadinia; K. Heyde; U. Jakobsson; P. M. Jones; R. Julin; S. Juutinen; S. Ketelhut; M. Labiche; M. Leino; A. -P. Leppanen; M. Nyman; D. O'Donnell; E. S. Paul; M. Petri; P. Peura; A. Puurunen; P. Rahkila; P. Ruotsalainen; M. Sandzelius; P. J. Sapple; J. Saren; C. Scholey; N. A. Smirnova; A. N. Steer; P. D. Stevenson; E. B. Suckling; J. Thomson; J. Uusitalo; M. Venhart

doi:10.1016/j.physletb.2010.04.056

Discovery of W-157 and Os-161

L. Bianco, R. D. Page, I. G. Darby, D. T. Joss, J. Simpson, J. J. Al-Khalili, A. J. Cannon, B. Cederwall, S. Eeckhaudt, S. Erturk, B. Gall, M. B. Gomez Hornillos, T. Grahn, P. T. Greenlees, B. Hadinia, K. Heyde, U. Jakobsson, P. M. Jones, R. Julin, S. JuutinenS. Ketelhut, M. Labiche, M. Leino, A. -P. Leppanen, M. Nyman, D. O'Donnell, E. S. Paul, M. Petri, P. Peura, A. Puurunen, P. Rahkila, P. Ruotsalainen, M. Sandzelius, P. J. Sapple, J. Saren, C. Scholey, N. A. Smirnova, A. N. Steer, P. D. Stevenson, E. B. Suckling, J. Thomson, J. Uusitalo, M. Venhart

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19 Citations (Scopus)

Abstract

Abstract
The nuclides 157W and 161Os have been discovered in reactions of 58Ni ion beams with a 106Cd target. The 161Os α -decay energy and half-life were 6890±12 keV6890±12 keV and 640±60 μs640±60 μs. The daughter 157W nuclei β -decayed with a half-life of 275±40 ms275±40 ms, populating both low-lying α-decaying states in 157Ta, which is consistent with a 7/2−7/2− ground state in 157W. Fine structure observed in the α decay of 161Os places the lowest excited state in 157W with Iπ=9/2−Iπ=9/2− at 318±30 keV318±30 keV. The branching ratio of View the MathML source5.5−2.2+3.1% indicates that 161Os also has a 7/2−7/2− ground state. Shell-model calculations analysing the effects of monopole shifts and a tensor force on the relative energies of 2f7/22f7/2 and 1h9/21h9/2 neutron states in N=83N=83 isotones are presented.

Original language	English
Pages (from-to)	15-18
Number of pages	4
Journal	Physics Letters B
Volume	690
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2010.04.056
Publication status	Published - 2010
Externally published	Yes

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Bianco, L., Page, R. D., Darby, I. G., Joss, D. T., Simpson, J., Al-Khalili, J. J., Cannon, A. J., Cederwall, B., Eeckhaudt, S., Erturk, S., Gall, B., Hornillos, M. B. G., Grahn, T., Greenlees, P. T., Hadinia, B., Heyde, K., Jakobsson, U., Jones, P. M., Julin, R., ... Venhart, M. (2010). Discovery of W-157 and Os-161. Physics Letters B, 690(1), 15-18. https://doi.org/10.1016/j.physletb.2010.04.056

@article{a6b92e6e4a4447d48e0d638229c05727,

title = "Discovery of W-157 and Os-161",

abstract = "AbstractThe nuclides 157W and 161Os have been discovered in reactions of 58Ni ion beams with a 106Cd target. The 161Os α -decay energy and half-life were 6890±12 keV6890±12 keV and 640±60 μs640±60 μs. The daughter 157W nuclei β -decayed with a half-life of 275±40 ms275±40 ms, populating both low-lying α-decaying states in 157Ta, which is consistent with a 7/2−7/2− ground state in 157W. Fine structure observed in the α decay of 161Os places the lowest excited state in 157W with Iπ=9/2−Iπ=9/2− at 318±30 keV318±30 keV. The branching ratio of View the MathML source5.5−2.2+3.1% indicates that 161Os also has a 7/2−7/2− ground state. Shell-model calculations analysing the effects of monopole shifts and a tensor force on the relative energies of 2f7/22f7/2 and 1h9/21h9/2 neutron states in N=83N=83 isotones are presented.",

author = "L. Bianco and Page, {R. D.} and Darby, {I. G.} and Joss, {D. T.} and J. Simpson and Al-Khalili, {J. J.} and Cannon, {A. J.} and B. Cederwall and S. Eeckhaudt and S. Erturk and B. Gall and Hornillos, {M. B. Gomez} and T. Grahn and Greenlees, {P. T.} and B. Hadinia and K. Heyde and U. Jakobsson and Jones, {P. M.} and R. Julin and S. Juutinen and S. Ketelhut and M. Labiche and M. Leino and Leppanen, {A. -P.} and M. Nyman and D. O'Donnell and Paul, {E. S.} and M. Petri and P. Peura and A. Puurunen and P. Rahkila and P. Ruotsalainen and M. Sandzelius and Sapple, {P. J.} and J. Saren and C. Scholey and Smirnova, {N. A.} and Steer, {A. N.} and Stevenson, {P. D.} and Suckling, {E. B.} and J. Thomson and J. Uusitalo and M. Venhart",

year = "2010",

doi = "10.1016/j.physletb.2010.04.056",

language = "English",

volume = "690",

pages = "15--18",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "1",

}

Bianco, L, Page, RD, Darby, IG, Joss, DT, Simpson, J, Al-Khalili, JJ, Cannon, AJ, Cederwall, B, Eeckhaudt, S, Erturk, S, Gall, B, Hornillos, MBG, Grahn, T, Greenlees, PT, Hadinia, B, Heyde, K, Jakobsson, U, Jones, PM, Julin, R, Juutinen, S, Ketelhut, S, Labiche, M, Leino, M, Leppanen, A-P, Nyman, M, O'Donnell, D, Paul, ES, Petri, M, Peura, P, Puurunen, A, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Sapple, PJ, Saren, J, Scholey, C, Smirnova, NA, Steer, AN, Stevenson, PD, Suckling, EB, Thomson, J, Uusitalo, J & Venhart, M 2010, 'Discovery of W-157 and Os-161', Physics Letters B, vol. 690, no. 1, pp. 15-18. https://doi.org/10.1016/j.physletb.2010.04.056

TY - JOUR

T1 - Discovery of W-157 and Os-161

AU - Bianco, L.

AU - Page, R. D.

AU - Darby, I. G.

AU - Joss, D. T.

AU - Simpson, J.

AU - Al-Khalili, J. J.

AU - Cannon, A. J.

AU - Cederwall, B.

AU - Eeckhaudt, S.

AU - Erturk, S.

AU - Gall, B.

AU - Hornillos, M. B. Gomez

AU - Grahn, T.

AU - Greenlees, P. T.

AU - Hadinia, B.

AU - Heyde, K.

AU - Jakobsson, U.

AU - Jones, P. M.

AU - Julin, R.

AU - Juutinen, S.

AU - Ketelhut, S.

AU - Labiche, M.

AU - Leino, M.

AU - Leppanen, A. -P.

AU - Nyman, M.

AU - O'Donnell, D.

AU - Paul, E. S.

AU - Petri, M.

AU - Peura, P.

AU - Puurunen, A.

AU - Rahkila, P.

AU - Ruotsalainen, P.

AU - Sandzelius, M.

AU - Sapple, P. J.

AU - Saren, J.

AU - Scholey, C.

AU - Smirnova, N. A.

AU - Steer, A. N.

AU - Stevenson, P. D.

AU - Suckling, E. B.

AU - Thomson, J.

AU - Uusitalo, J.

AU - Venhart, M.

PY - 2010

Y1 - 2010

N2 - AbstractThe nuclides 157W and 161Os have been discovered in reactions of 58Ni ion beams with a 106Cd target. The 161Os α -decay energy and half-life were 6890±12 keV6890±12 keV and 640±60 μs640±60 μs. The daughter 157W nuclei β -decayed with a half-life of 275±40 ms275±40 ms, populating both low-lying α-decaying states in 157Ta, which is consistent with a 7/2−7/2− ground state in 157W. Fine structure observed in the α decay of 161Os places the lowest excited state in 157W with Iπ=9/2−Iπ=9/2− at 318±30 keV318±30 keV. The branching ratio of View the MathML source5.5−2.2+3.1% indicates that 161Os also has a 7/2−7/2− ground state. Shell-model calculations analysing the effects of monopole shifts and a tensor force on the relative energies of 2f7/22f7/2 and 1h9/21h9/2 neutron states in N=83N=83 isotones are presented.

AB - AbstractThe nuclides 157W and 161Os have been discovered in reactions of 58Ni ion beams with a 106Cd target. The 161Os α -decay energy and half-life were 6890±12 keV6890±12 keV and 640±60 μs640±60 μs. The daughter 157W nuclei β -decayed with a half-life of 275±40 ms275±40 ms, populating both low-lying α-decaying states in 157Ta, which is consistent with a 7/2−7/2− ground state in 157W. Fine structure observed in the α decay of 161Os places the lowest excited state in 157W with Iπ=9/2−Iπ=9/2− at 318±30 keV318±30 keV. The branching ratio of View the MathML source5.5−2.2+3.1% indicates that 161Os also has a 7/2−7/2− ground state. Shell-model calculations analysing the effects of monopole shifts and a tensor force on the relative energies of 2f7/22f7/2 and 1h9/21h9/2 neutron states in N=83N=83 isotones are presented.

U2 - 10.1016/j.physletb.2010.04.056

DO - 10.1016/j.physletb.2010.04.056

M3 - Article

SN - 0370-2693

VL - 690

SP - 15

EP - 18

JO - Physics Letters B

JF - Physics Letters B

IS - 1

ER -

Discovery of W-157 and Os-161

Abstract

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