Photon scattering experiments on the quasistable, odd-odd mass nucleus Lu-176

S. Walter, F. Stedile, J.J. Carroll, C. Fransen, G. Friessner, N. Hollmann, H. von Garrel, J. Jolie, O. Karg, F. Kaeppeler, U. Kneissl, C. Kohstall, P. von Neumann-Cosel, A. Linnemann, D. Muecher, N. Pietralla, H.H. Pitz, G. Rusev, M. Scheck, C. Scholl & 3 others R. Schwengner, V. Werner, K. Wisshak

Research output: Contribution to journalArticle

Abstract

The quasistable odd-odd-mass nucleus 176Lu is of special interest in nuclear structure physics and, above all, in nuclear astrophysics. Systematic photon scattering experiments have been performed at the bremsstrahlung facility of the 4.3-MV Stuttgart Dynamitron accelerator with bremsstrahlung end-point energies of 2.3 and 3.1 MeV to determine the low-energy dipole strength distribution in the s-only isotope 176Lu. The main goal was to pin down possible intermediate states (IS) for the photoactivation of the short-lived 123-keV isomer, which is the key process determining the effective lifetime of
176Lu in a stellar photon bath and hence for the use of this isotope as a stellar chronometer. Using an enriched sample, 29 transitions ascribed to
176Lu were detected below 2.9-MeV excitation energy. The corresponding excitation strengths were determined. For the previously proposed lowest IS at 839 keV, an upper limit for the excitation strength corresponding to a lifetime of
τ⩾1.5 ps can be given. Astrophysical consequences, also in view of new Stuttgart photoactivation experiments, are discussed. The fragmentation of the dipole strength is compared to those in neighboring even-even and odd-even nuclei.
Original languageEnglish
Article number034301
JournalPhysical Review C
Volume75
Issue number3
DOIs
Publication statusPublished - Mar 2007
Externally publishedYes

Cite this

Walter, S., Stedile, F., Carroll, J. J., Fransen, C., Friessner, G., Hollmann, N., ... Wisshak, K. (2007). Photon scattering experiments on the quasistable, odd-odd mass nucleus Lu-176. Physical Review C, 75(3), [034301]. https://doi.org/10.1103/PhysRevC.75.034301
Walter, S. ; Stedile, F. ; Carroll, J.J. ; Fransen, C. ; Friessner, G. ; Hollmann, N. ; von Garrel, H. ; Jolie, J. ; Karg, O. ; Kaeppeler, F. ; Kneissl, U. ; Kohstall, C. ; von Neumann-Cosel, P. ; Linnemann, A. ; Muecher, D. ; Pietralla, N. ; Pitz, H.H. ; Rusev, G. ; Scheck, M. ; Scholl, C. ; Schwengner, R. ; Werner, V. ; Wisshak, K. / Photon scattering experiments on the quasistable, odd-odd mass nucleus Lu-176. In: Physical Review C. 2007 ; Vol. 75, No. 3.
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abstract = "The quasistable odd-odd-mass nucleus 176Lu is of special interest in nuclear structure physics and, above all, in nuclear astrophysics. Systematic photon scattering experiments have been performed at the bremsstrahlung facility of the 4.3-MV Stuttgart Dynamitron accelerator with bremsstrahlung end-point energies of 2.3 and 3.1 MeV to determine the low-energy dipole strength distribution in the s-only isotope 176Lu. The main goal was to pin down possible intermediate states (IS) for the photoactivation of the short-lived 123-keV isomer, which is the key process determining the effective lifetime of 176Lu in a stellar photon bath and hence for the use of this isotope as a stellar chronometer. Using an enriched sample, 29 transitions ascribed to 176Lu were detected below 2.9-MeV excitation energy. The corresponding excitation strengths were determined. For the previously proposed lowest IS at 839 keV, an upper limit for the excitation strength corresponding to a lifetime of τ⩾1.5 ps can be given. Astrophysical consequences, also in view of new Stuttgart photoactivation experiments, are discussed. The fragmentation of the dipole strength is compared to those in neighboring even-even and odd-even nuclei.",
author = "S. Walter and F. Stedile and J.J. Carroll and C. Fransen and G. Friessner and N. Hollmann and {von Garrel}, H. and J. Jolie and O. Karg and F. Kaeppeler and U. Kneissl and C. Kohstall and {von Neumann-Cosel}, P. and A. Linnemann and D. Muecher and N. Pietralla and H.H. Pitz and G. Rusev and M. Scheck and C. Scholl and R. Schwengner and V. Werner and K. Wisshak",
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Walter, S, Stedile, F, Carroll, JJ, Fransen, C, Friessner, G, Hollmann, N, von Garrel, H, Jolie, J, Karg, O, Kaeppeler, F, Kneissl, U, Kohstall, C, von Neumann-Cosel, P, Linnemann, A, Muecher, D, Pietralla, N, Pitz, HH, Rusev, G, Scheck, M, Scholl, C, Schwengner, R, Werner, V & Wisshak, K 2007, 'Photon scattering experiments on the quasistable, odd-odd mass nucleus Lu-176' Physical Review C, vol. 75, no. 3, 034301. https://doi.org/10.1103/PhysRevC.75.034301

Photon scattering experiments on the quasistable, odd-odd mass nucleus Lu-176. / Walter, S.; Stedile, F.; Carroll, J.J.; Fransen, C.; Friessner, G.; Hollmann, N.; von Garrel, H.; Jolie, J.; Karg, O.; Kaeppeler, F.; Kneissl, U.; Kohstall, C.; von Neumann-Cosel, P.; Linnemann, A.; Muecher, D.; Pietralla, N.; Pitz, H.H.; Rusev, G.; Scheck, M.; Scholl, C.; Schwengner, R.; Werner, V.; Wisshak, K.

In: Physical Review C, Vol. 75, No. 3, 034301, 03.2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Photon scattering experiments on the quasistable, odd-odd mass nucleus Lu-176

AU - Walter, S.

AU - Stedile, F.

AU - Carroll, J.J.

AU - Fransen, C.

AU - Friessner, G.

AU - Hollmann, N.

AU - von Garrel, H.

AU - Jolie, J.

AU - Karg, O.

AU - Kaeppeler, F.

AU - Kneissl, U.

AU - Kohstall, C.

AU - von Neumann-Cosel, P.

AU - Linnemann, A.

AU - Muecher, D.

AU - Pietralla, N.

AU - Pitz, H.H.

AU - Rusev, G.

AU - Scheck, M.

AU - Scholl, C.

AU - Schwengner, R.

AU - Werner, V.

AU - Wisshak, K.

PY - 2007/3

Y1 - 2007/3

N2 - The quasistable odd-odd-mass nucleus 176Lu is of special interest in nuclear structure physics and, above all, in nuclear astrophysics. Systematic photon scattering experiments have been performed at the bremsstrahlung facility of the 4.3-MV Stuttgart Dynamitron accelerator with bremsstrahlung end-point energies of 2.3 and 3.1 MeV to determine the low-energy dipole strength distribution in the s-only isotope 176Lu. The main goal was to pin down possible intermediate states (IS) for the photoactivation of the short-lived 123-keV isomer, which is the key process determining the effective lifetime of 176Lu in a stellar photon bath and hence for the use of this isotope as a stellar chronometer. Using an enriched sample, 29 transitions ascribed to 176Lu were detected below 2.9-MeV excitation energy. The corresponding excitation strengths were determined. For the previously proposed lowest IS at 839 keV, an upper limit for the excitation strength corresponding to a lifetime of τ⩾1.5 ps can be given. Astrophysical consequences, also in view of new Stuttgart photoactivation experiments, are discussed. The fragmentation of the dipole strength is compared to those in neighboring even-even and odd-even nuclei.

AB - The quasistable odd-odd-mass nucleus 176Lu is of special interest in nuclear structure physics and, above all, in nuclear astrophysics. Systematic photon scattering experiments have been performed at the bremsstrahlung facility of the 4.3-MV Stuttgart Dynamitron accelerator with bremsstrahlung end-point energies of 2.3 and 3.1 MeV to determine the low-energy dipole strength distribution in the s-only isotope 176Lu. The main goal was to pin down possible intermediate states (IS) for the photoactivation of the short-lived 123-keV isomer, which is the key process determining the effective lifetime of 176Lu in a stellar photon bath and hence for the use of this isotope as a stellar chronometer. Using an enriched sample, 29 transitions ascribed to 176Lu were detected below 2.9-MeV excitation energy. The corresponding excitation strengths were determined. For the previously proposed lowest IS at 839 keV, an upper limit for the excitation strength corresponding to a lifetime of τ⩾1.5 ps can be given. Astrophysical consequences, also in view of new Stuttgart photoactivation experiments, are discussed. The fragmentation of the dipole strength is compared to those in neighboring even-even and odd-even nuclei.

U2 - 10.1103/PhysRevC.75.034301

DO - 10.1103/PhysRevC.75.034301

M3 - Article

VL - 75

JO - Physical Review C

JF - Physical Review C

SN - 2469-9985

IS - 3

M1 - 034301

ER -

Walter S, Stedile F, Carroll JJ, Fransen C, Friessner G, Hollmann N et al. Photon scattering experiments on the quasistable, odd-odd mass nucleus Lu-176. Physical Review C. 2007 Mar;75(3). 034301. https://doi.org/10.1103/PhysRevC.75.034301