Second minimum lifetime measurements in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Nd</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>133</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Nd</mml:mi></mml:mrow><mm

Mullins, S. M.; Jenkins, Iredell; He, Y. J.; Kirwan, A; Nolan, P. J.; Hughes, James; Wadsworth, R.; Wyss, R.

doi:10.1103/physrevc.45.2683

Cited by 33 publications

(9 citation statements)

References 21 publications

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“…They are consistent with the value of Mullins et al [13] for the higher members of the band, measured in a line shape analysis of a DSAM experiment. The average value of the quadrupole moment measured from the ~+ and 21 + levels in this RDM experiment, of Q0 6.5 + 0.7 eb,…”

Section: Discussionsupporting

confidence: 91%

“…Comparing the in-band reduced transition probabilities obtained from this data with values for other quadrupole transitions in this mass region indicates that the in-band transitions are strong, which is expected from the highly collective nature of the superdeformed band. The reduced transition probability calculated for the higher members of the band, assuming the value of Qo = 6.7 eb from [13], is 370 Wu. Thus, the in-band reduced transition probabilities at the bottom of the band are comparable with the higher levels.…”

Section: Discussionmentioning

confidence: 99%

“…A DSAM experiment has already been performed for the superdeformed band in 133Nd [13] in which it was possible to measure the lifetimes and hence quadrupole moment and deformation, of transitions above the 3~+ level. It was not possible to measure the lifetimes for states below this level, as the transitions below the 684 keV gamma-ray were emitted after the nuclei had stopped in the target backing, and thus were not Doppler shifted.…”

Section: Sd Bandmentioning

confidence: 99%

“…In order to decide which target-to-stopper distances were optimum for the experiment, the lifetimes of the lower states in the band were estimated assuming the same quadrupole moment, Qo = 6.7 eb, as measured for the high spin states in the superdeformed band by Mullins et al [13]. The range of distances was chosen to encompass the sensitive regions for the transitions of interest, from about 100 gm down to the smallest separation possible.…”

Section: Experimental and Analysis Detailsmentioning

confidence: 99%

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Measurement of the mean lifetimes of low spin states in the superdeformed band in133Nd

Forbes

Böhm

Clark

et al. 1995

Z. Physik A - Hadrons and Nuclei

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Abstract. The mean lifetimes of the lower spin states of the superdeformed band in 133Nd have been measured with the coincidence recoil distance method. The reaction used to populate the band was l~ (32S, 2p2n) 133Nd at a beam energy of 152 MeV, and the gamma-rays were detected with the POLYTESSA array. The differential decay curve method was used to analyse the data and transition quadrupole moments, Q0, were extracted from the measured lifetimes. The results obtained from the three lowest transitions in the superdeformed band are: Qo=6.3+0.9eb (21+ _,~+), Qo=6.7+l.leb (z~+ ~z~+) and Q0 > 5.0eb (~+--,~+). These results are consistent with previous results for the high spin members of the band, and are compared to theoretical calculations of total routhian surfaces. The calculation of reduced transition probabilities for the transitions that feed out of the band, allows the effect of hindrance due to K-forbiddenness to be investigated.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Sd Bandmentioning

confidence: 99%

Section: Experimental and Analysis Detailsmentioning

confidence: 99%

See 2 more Smart Citations

Measurement of the mean lifetimes of low spin states in the superdeformed band in133Nd

Forbes

Böhm

Clark

et al. 1995

Z. Physik A - Hadrons and Nuclei

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“…The calculated curve has been obtained with the prescription used in Ref. [5], assuming a constant quadrupole moment which is identical for in-band and sidefeeding transitions.…”

mentioning

confidence: 99%

The protonh11/2intruder orbital: Evidence for collectivity and a strong proton-neutron interaction

Janzen¹,

Andrews²,

Haas³

et al. 1993

Phys. Rev. Lett.

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A rotational band based on the proton hn/ 2 orbital has been observed to high spin (^h) and high rotational frequency (hcu ~ 1.0 MeV) in the nucleus ^f Sb. The measured transition quadrupole moment is QQ = 4.4 ± 0.6 eb, consistent with an axial prolate deformation of $2 -0.32. A large interaction strength (360 ±60 keV) has been measured for the rotational alignment of hn/ 2 neutrons which, together with a considerable delay in the crossing frequency (Ahtu c± 0.09 MeV), is construed as the first direct evidence of a large high-jf proton-neutron interaction.PACS numbers: 21.10. Re, 21.30.+y, 23.20.Lv, 27.60,+j A knowledge of the forces which drive the few-body nuclear system into collective motion, together with an understanding of both collective and noncollective effects within a single unified model, are fundamental goals in the study of nuclear structure. At modest excitation energy and spin in the odd-mass antimony nuclei (Sb, Z = 51), collective band structures are observed to coexist side by side with states corresponding to singleparticle excitations [1,2]. The collective states have been interpreted as proton particle-hole excitations across the major shell gap, made energetically possible by the combination of strong proton-pair correlations and a postulated proton-neutron interaction (e.g., Ref.[3]). The onset of prolate deformation, and thus the appearance of collective rotational bands, has also been linked to the occupation of particular orbitals which are preferentially lowered in energy at large quadrupole deformations (e.g., Ref.[4]), and hence exert a driving force towards increased deformation. Such high-j "intruder" orbitals are characterized by large values of single-particle angular momentum aligned along the axis of rotation, leading to a further reduction in energy due to the Coriolis force at high rotational frequency.Before this study very little experimental information existed concerning states at high spin (7 > 20ft) in nuclei near the Z = 50 closed spherical shell. In addition, no lifetime data (and therefore no measure of the collectivity) existed for the known band structures. In this Letter we address the role of the proton hu/2 orbital as a highspin intruder configuration, and report the first measurement of a transition quadrupole moment for a collective band in the Z = 50 region. Moreover, we show that the observed characteristics of the /in/2 intruder band may now be used to test the standard mean-field approach to nuclear structure calculations.High-spin states in 113 Sb have been populated via the 94 Mo( 23 Na,2p2n) reaction, with a 117-MeV sodium beam provided by the Tandem Accelerator Superconducting Cyclotron (TASCC) Facility at Chalk River Laboratories. Experiments were performed with thin selfsupporting and Au-backed enriched target foils, to provide high energy-resolution data and Doppler-shift information, respectively. Approximately 2 x 10 8 (selfsupporting target) and 3.2 x 10 8 (backed target) 7-7 events were collected with the 8TT spectrometer, which comprises 20...

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The A~130 Highly-Deformed Region: New Results and Global Differential Lifetime Measurements

et al. 2000

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Second minimum lifetime measurements inNd133andNd

Cited by 33 publications

References 21 publications

Measurement of the mean lifetimes of low spin states in the superdeformed band in133Nd

Measurement of the mean lifetimes of low spin states in the superdeformed band in133Nd

The protonh11/2intruder orbital: Evidence for collectivity and a strong proton-neutron interaction

The A~130 Highly-Deformed Region: New Results and Global Differential Lifetime Measurements

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