A magnetic transport electron spectrometer for in-beam measurements

Fazzini, T.; Giannatiempo, A.; Perego, A.

doi:10.1016/0167-5087(83)90560-4

Cited by 15 publications

(6 citation statements)

References 8 publications

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“…[22]), which can deflect electrons up to an energy of 3 MeV onto a 5 cm 2 × 6 mm Si(Li) detector cooled to the liquid nitrogen temperature. An upgrading of the system [23] proved to be necessary to match the beam characteristics of the ISOLDE separator.…”

Section: B K -Conversion Electron and γ -Ray Spectroscopymentioning

confidence: 99%

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
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The properties of the excited states of 76 Kr, populated in the decay of 76 Rb produced at ISOLDE isotopic separator, have been investigated by using K-conversion electron, γ -ray, and γ -γ coincidence measurements. The lifetimes of several levels have been measured by means of the advanced time-delayed βγ γ (t) method. The identification of 19 new levels and 55 transitions and the information deduced on spin and/or parity of the observed states from K-conversion coefficients, log ft values and decay properties have led to an improved knowledge of the level scheme. In particular, six 1 − states have been definitely identified and J π = 2 − has been assigned to the 2227 keV level, on which a band proposed to have negative-parity and even-spin had been previously observed. The strengths of the E0 and E2 transitions deexciting the 0

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Section: B K -Conversion Electron and γ -Ray Spectroscopymentioning

confidence: 99%

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
Self Cite
18
2
10
0
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“…The conversion electrons were analyzed by means of a compact magnetic transport system [6] coupled to a 5 cm x6 mm Si(Li) detector cooled down to the liquid nitrogen temperature. Under typical experimental conditions the energy resolution (full width at half maxi-mum) at 1 MeV was about 2 keV.…”

mentioning

confidence: 99%

“…Under typical experimental conditions the energy resolution (full width at half maxi-mum) at 1 MeV was about 2 keV. Due to the large number of y rays in the decay of Rb, which generate considerable background in the silicon detector, it has been necessary to increase, with respect to the standard setup [6], the distance of the detector from the collection point so as to enable the insertion of additional shielding external to the spectrometer vacuum chamber. This greatly improved the signal to background ratio in the electron-energy spectra.…”

mentioning

confidence: 99%

Decay properties of the02+state and spin-parity assignments inKr
Giannatiempo
¹
,
Nannini
²
,
Perego
³

et al. 1995
Phys. Rev. C
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The lifetime 7. of the 02 state in Kr has been measured by means of the Doppler shift attenuation method in gases. From the value of~and the measured value of the K-internal conversion branching Is(Oz~0,+)/Itt(Oz~2, +) the value of the electric monopole strength p (EO) of the 02 -+0, + transition has been deduced. Restriction or assignments for the spin parity of several levels in Kr, populated in the decay of Rb, have been deduced by measuring K-internal conversion coefficients of the relevant transitions. PACS number(s): 23.20.Nx, 21.10.Hw, 23.20.Lv, 27.50.+e As a part of a systematic investigation of the EO and E2 decay modes of 0+ excited states in even krypton isotopes, we recently reported some spectroscopic data on Kr concerning, in particular, the decay properties of the 02 state [I] In even krypton isotopes this state was interpreted by some authors [2] as belonging to the standard space of the interacting boson model in its IBM-1 version [3],while other authors [4], applying the IBM-2 model [3], interpreted it as an "intruder state, " i.e. , as lying outside the IBM model space. In Refs. [2,4] the comparison between experimental and calculated data relevant to 02 states was necessarily limited to excitation energies, due to the lack of experimental data on transition strengths from these states. In Ref. [1]we compared the available spectroscopic data on low-lying levels of Kr with the values predicted by the IBA-2 model, when a set of parameters different from that adopted in Ref.[4] is used. We found that it is still possible to give a consistent description both of excitation energies of the 02 state in these nuclei and decay properties of the 02 state in Kr, without introducing configurations lying outside the IBA-2 model space.In this paper we report on measurements in Kr concerning (i) the decay properties of the 1017 keV, Oz state, which could provide further support to the proposed description of the 02 states in Kr and (ii) the determination of several internal conversion coefficients, which enable us to assign the parity of several levels as well as to restrict the possible range of their spin values. This information is necessary for an analysis of the low-lying positive-parity levels of the even krypton isotopes (that we plan to perform in the near future) aimed at the identification of states having predominant mixed symmetry character under exchange of proton and neutron bosons [3]. The low-lying levels in Kr were populated in the P /EC decay of Rb [5] collected at the ISOLDE mass separator (CERN). The conversion electrons were analyzed by means of a compact magnetic transport system [6] coupled to a 5 cm x6 mm Si(Li) detector cooled down to the liquid nitrogen temperature. Under typical experimental conditions the energy resolution (full width at half maxi-mum) at 1 MeV was about 2 keV. Due to the large number of y rays in the decay of Rb, which generate considerable background in the silicon detector, it has been necessary to

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“…Conversion electrons were analyzed by means of a magnetic transport system [10], which deflects electrons onto a 5 cmZ x 6 mm Si(Li) detector. The overall peak efficiency is ~-1% in the range from 150 keV to 1500 keV and the momentum acceptance Ap/p is ~ 18%.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

Search for the lowest 2+ mixed-symmetry state in102Ru

Fazzini

Giannatiempo

Nannini

et al. 1993

Z. Physik A - Hadrons and Nuclei

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A magnetic transport electron spectrometer for in-beam measurements

Cited by 15 publications

References 8 publications

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
Self Cite
18
2
10
0
View full text Add to dashboard Cite

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
Self Cite
18
2
10
0
View full text Add to dashboard Cite

Decay properties of the02+state and spin-parity assignments inKr
Giannatiempo
¹
,
Nannini
²
,
Perego
³

et al. 1995
Phys. Rev. C
Self Cite
17
1
10
0
View full text Add to dashboard Cite

Search for the lowest 2+ mixed-symmetry state in102Ru

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A magnetic transport electron spectrometer for in-beam measurements

Cited by 15 publications

References 8 publications

Spectroscopy and lifetime measurements of states inKr76populated inRb76Giannatiempo1, Perego2, Sona3 et al. 2005Phys. Rev. CSelf Cite182100View full textAdd to dashboardCite

Spectroscopy and lifetime measurements of states inKr76populated inRb76Giannatiempo1, Perego2, Sona3 et al. 2005Phys. Rev. CSelf Cite182100View full textAdd to dashboardCite

Decay properties of the02+state and spin-parity assignments inKrGiannatiempo1, Nannini2, Perego3 et al. 1995Phys. Rev. CSelf Cite171100View full textAdd to dashboardCite

Search for the lowest 2+ mixed-symmetry state in102Ru

Contact Info

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Resources

About

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
Self Cite
18
2
10
0
View full text Add to dashboard Cite

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
Self Cite
18
2
10
0
View full text Add to dashboard Cite

Decay properties of the02+state and spin-parity assignments inKr
Giannatiempo
¹
,
Nannini
²
,
Perego
³

et al. 1995
Phys. Rev. C
Self Cite
17
1
10
0
View full text Add to dashboard Cite