Study of spontaneous fission with EUROGAM

Urban, W.; Durell, J. L.; Phillips, W. R.; Smith, Andrew; Jones, M.A.; Ahmad, I.; Barnett, A.R.; Bentaleb, M.; Dorning, S.J.; Leddy, M. J.; Lubkiewicz, E.; Morss, Lester R.; Rza̧ca‐Urban, T.; Sareen, R. A.; Schulz, N.; Varley, B. J.

doi:10.1007/s002180050291

Cited by 73 publications

(29 citation statements)

References 31 publications

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“…The experiment has been described previously in a number of articles and we refer the reader to Ref. [7] for more experimental details. The data have been sorted within time window of 400 ns into 3D histograms of high dispersion [8], which allowed further progress as compared to an early analysis done for 138 Te [9] and 140 Xe [10][11][12].…”

Section: Experiments and Data Analysismentioning

confidence: 99%

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First evidence ofγcollectivity close to the doubly magic coreSn132

et al. 2016

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The138 Te and 140 Xe nuclei have been reinvestigated using prompt γ-ray data from spontaneous fission of 248 Cm, collected with the EUROGAM2 Ge array. γ bands have been identified in both nuclei. The γ band observed in 138 Te, a nucleus with only 6 valence nucleons, indicates the presence of collectivity very close to the doubly-magic 132 Sn core. Such band is even more pronounced in 140 Xe, the N=86 isotone of 138 Te. The newly observed bands are interpreted within the shell model, which reproduce well the γ collectivity at N=86.

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Section: Experiments and Data Analysismentioning

confidence: 99%

“…In the present work we have determined angular correlations for some of γγ cascades, using techniques described in Ref. [7]. It is known that an intermediate, stretched quadrupole transition in a cascade does not change angular correlations.…”

Section: Experiments and Data Analysismentioning

confidence: 99%

First evidence ofγcollectivity close to the doubly magic coreSn132

et al. 2016

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“…The measurement of high-fold coincidences of prompt γ rays following fission was performed with the EUROGAM2 array (see Ref. [5] for detailed description of the experiment and data analysis). Since our previous study of 135 Sb [6] we have improved the analysis technique [7], which has allowed for the observation of additional excited states in 135 Sb above spin I π =23/2 + reported in Ref.…”

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Investigation of thei13/2neutron orbital in theSn132region: New excited levels in
Korgul¹,
Bączyk²,
Urban
³

et al. 2015
Phys. Rev. C
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“…The data were sorted into 3D histograms, which were used to produce doubly gated gamma spectra (see refs. [11,12] for more details).…”

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First observation of medium-spin excitations in the 138Cs nucleus

et al. 2007

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Abstract. Medium-spin, yrast excitations in the138 Cs nucleus, populated in the spontaneous fission of 248 Cm, were observed for the first time.138 Cs was studied by means of prompt γ-ray spectroscopy using the EUROGAM2 array. The newly observed yrast cascade, built on the known 6 − isomer at 80 keV, was successfully described by shell model calculations. (see refs. [3,5] for details). Similarly good description was also obtained in our study of an analogous 6 − isomer in the isotone 136 I [6] where the single-particle energy of the proton d 5/2 orbital had to be lowered by 400 keV relative to its position in 133 Sb. This puzzling effect was first observed in 135 Sb and interpreted as due to the formation of neutron skin past the N = 82 a e-mail: Teresa.Rzaca@fuw.edu.pl shell [7,8]. Using the SMPN set we confirmed the need to lower the d 5/2 orbital in 135 Sb but in ref.[6] we argued against the neutron skin hypothesis, noting that its formation should be a slow phenomenon like other changes in this region connected with the growing number of neutrons, whereas the need for a decrease of d 5/2 s.p. energy was rather abrupt. Instead, we suggested that the lowering of the πd 5/2 s.p. energy may be an artificial effect, which surprisingly well accounts for deficiencies of some of the tbme's, possibly proton-neutron interactions. To propose any improvement one would like to know how the effect varies with the proton and the neutron number. In fig. 1 we show the approximate shifts (in keV), which have to be applied to the πd 5/2 s.p. energy in various nuclei in the 132 Sn region in order to reproduce them properly. Figure 1 suggests that the effect grows with the number of valence neutrons and/or the number of πν pairs. It is thus of interest to find its magnitude in the 138 Cs nucleus. On one hand, fig. 1 suggests a non-zero value, on the other hand, the calculations of ref.[3] done

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Study of spontaneous fission with EUROGAM

Cited by 73 publications

References 31 publications

First evidence ofγcollectivity close to the doubly magic coreSn132

First evidence ofγcollectivity close to the doubly magic coreSn132

Investigation of thei13/2neutron orbital in theSn132region: New excited levels in
Korgul¹,
Bączyk²,
Urban
³

et al. 2015
Phys. Rev. C
Self Cite

First observation of medium-spin excitations in the 138Cs nucleus

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Study of spontaneous fission with EUROGAM

Cited by 73 publications

References 31 publications

First evidence ofγcollectivity close to the doubly magic coreSn132

First evidence ofγcollectivity close to the doubly magic coreSn132

Investigation of thei13/2neutron orbital in theSn132region: New excited levels inKorgul1, Bączyk2, Urban3 et al. 2015Phys. Rev. CSelf Cite

First observation of medium-spin excitations in the 138Cs nucleus

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Investigation of thei13/2neutron orbital in theSn132region: New excited levels in
Korgul¹,
Bączyk²,
Urban
³

et al. 2015
Phys. Rev. C
Self Cite