Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements

andrea Jungclaus; J. Walker; J. Leske; K. H. Speidel; A. E. Stuchbery; M. East; P. Boutachkov; J. Cederkäll; P. Doornenbal; J. L. Egido; A. Ekström; J. Gerl; R. Gernhäuser; N. Goel; M. Górska; I. Kojouharov; P. Maier-Komor; V. Modamio; F. Naqvi; N. Pietralla; S. Pietri; W. Prokopowicz; H. Schaffner; R. Schwengner; H. J. Wollersheim

doi:10.1016/j.physletb.2010.11.012

Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements

andrea Jungclaus^*, J. Walker, J. Leske, K. H. Speidel, A. E. Stuchbery, M. East, P. Boutachkov, J. Cederkäll, P. Doornenbal, J. L. Egido, A. Ekström, J. Gerl, R. Gernhäuser, N. Goel, M. Górska, I. Kojouharov, P. Maier-Komor, V. Modamio, F. Naqvi, N. PietrallaS. Pietri, W. Prokopowicz, H. Schaffner, R. Schwengner, H. J. Wollersheim

^*Corresponding author for this work

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Abstract

Precise measurements of the lifetimes of the first excited 2⁺ states in the stable even-A Sn isotopes ^112-124Sn have been performed using the Doppler shift attenuation technique. For the isotopes ¹¹²Sn, ¹¹⁴Sn and ¹¹⁶Sn the E2 transition strengths deduced from the measured lifetimes are in disagreement with the previously reported values and indicate a shallow minimum at N=66. The observed deviation from a maximum at mid-shell is attributed to the obstructive effect of the s1/2 neutron orbital in generating collectivity when near the Fermi level.

Original language	English
Pages (from-to)	110-114
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	695
Issue number	1-4
DOIs	https://doi.org/10.1016/j.physletb.2010.11.012
Publication status	Published - 10 Jan 2011

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Jungclaus, A., Walker, J., Leske, J., Speidel, K. H., Stuchbery, A. E., East, M., Boutachkov, P., Cederkäll, J., Doornenbal, P., Egido, J. L., Ekström, A., Gerl, J., Gernhäuser, R., Goel, N., Górska, M., Kojouharov, I., Maier-Komor, P., Modamio, V., Naqvi, F., ... Wollersheim, H. J. (2011). Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 695(1-4), 110-114. https://doi.org/10.1016/j.physletb.2010.11.012

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title = "Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements",

abstract = "Precise measurements of the lifetimes of the first excited 2+ states in the stable even-A Sn isotopes 112-124Sn have been performed using the Doppler shift attenuation technique. For the isotopes 112Sn, 114Sn and 116Sn the E2 transition strengths deduced from the measured lifetimes are in disagreement with the previously reported values and indicate a shallow minimum at N=66. The observed deviation from a maximum at mid-shell is attributed to the obstructive effect of the s1/2 neutron orbital in generating collectivity when near the Fermi level.",

keywords = "Doppler shift attenuation technique, Lifetimes, Sn isotopes",

author = "andrea Jungclaus and J. Walker and J. Leske and Speidel, {K. H.} and Stuchbery, {A. E.} and M. East and P. Boutachkov and J. Cederk{\"a}ll and P. Doornenbal and Egido, {J. L.} and A. Ekstr{\"o}m and J. Gerl and R. Gernh{\"a}user and N. Goel and M. G{\'o}rska and I. Kojouharov and P. Maier-Komor and V. Modamio and F. Naqvi and N. Pietralla and S. Pietri and W. Prokopowicz and H. Schaffner and R. Schwengner and Wollersheim, {H. J.}",

year = "2011",

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doi = "10.1016/j.physletb.2010.11.012",

language = "English",

volume = "695",

pages = "110--114",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

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Jungclaus, A, Walker, J, Leske, J, Speidel, KH, Stuchbery, AE, East, M, Boutachkov, P, Cederkäll, J, Doornenbal, P, Egido, JL, Ekström, A, Gerl, J, Gernhäuser, R, Goel, N, Górska, M, Kojouharov, I, Maier-Komor, P, Modamio, V, Naqvi, F, Pietralla, N, Pietri, S, Prokopowicz, W, Schaffner, H, Schwengner, R & Wollersheim, HJ 2011, 'Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 695, no. 1-4, pp. 110-114. https://doi.org/10.1016/j.physletb.2010.11.012

Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements. / Jungclaus, andrea; Walker, J.; Leske, J. et al.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 695, No. 1-4, 10.01.2011, p. 110-114.

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

TY - JOUR

T1 - Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements

AU - Jungclaus, andrea

AU - Walker, J.

AU - Leske, J.

AU - Speidel, K. H.

AU - Stuchbery, A. E.

AU - East, M.

AU - Boutachkov, P.

AU - Cederkäll, J.

AU - Doornenbal, P.

AU - Egido, J. L.

AU - Ekström, A.

AU - Gerl, J.

AU - Gernhäuser, R.

AU - Goel, N.

AU - Górska, M.

AU - Kojouharov, I.

AU - Maier-Komor, P.

AU - Modamio, V.

AU - Naqvi, F.

AU - Pietralla, N.

AU - Pietri, S.

AU - Prokopowicz, W.

AU - Schaffner, H.

AU - Schwengner, R.

AU - Wollersheim, H. J.

PY - 2011/1/10

Y1 - 2011/1/10

N2 - Precise measurements of the lifetimes of the first excited 2+ states in the stable even-A Sn isotopes 112-124Sn have been performed using the Doppler shift attenuation technique. For the isotopes 112Sn, 114Sn and 116Sn the E2 transition strengths deduced from the measured lifetimes are in disagreement with the previously reported values and indicate a shallow minimum at N=66. The observed deviation from a maximum at mid-shell is attributed to the obstructive effect of the s1/2 neutron orbital in generating collectivity when near the Fermi level.

AB - Precise measurements of the lifetimes of the first excited 2+ states in the stable even-A Sn isotopes 112-124Sn have been performed using the Doppler shift attenuation technique. For the isotopes 112Sn, 114Sn and 116Sn the E2 transition strengths deduced from the measured lifetimes are in disagreement with the previously reported values and indicate a shallow minimum at N=66. The observed deviation from a maximum at mid-shell is attributed to the obstructive effect of the s1/2 neutron orbital in generating collectivity when near the Fermi level.

KW - Doppler shift attenuation technique

KW - Lifetimes

KW - Sn isotopes

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U2 - 10.1016/j.physletb.2010.11.012

DO - 10.1016/j.physletb.2010.11.012

M3 - Article

SN - 0370-2693

VL - 695

SP - 110

EP - 114

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-4

ER -

Evidence for reduced collectivity around the neutron mid-shell in the stable even-mass Sn isotopes from new lifetime measurements

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