Startup of the Fragment Mass Analyzer at ATLAS

Davids, C. N.; Back, B. B.; Bindra, K.; Henderson, D.J.; Kutschera, W.; Lauritsen, T.; Nagame, Y.; Sugathan, P.; Ramayya, A. V.; Walters, W. B.

doi:10.1016/0168-583x(92)95951-m

Cited by 249 publications

(66 citation statements)

References 4 publications

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“…In the present work, 101 detectors were used. After the target, recoiling reaction products were dispersed according to their mass-to-charge-state ratio (A/q) by the Argonne Fragment Mass Analyzer (FMA) [25,26], before being detected by a parallel-grid avalanche counter (PGAC) at the focal plane, and subsequently implanted into a double-sided silicon strip detector (DSSD). The FMA was set up such that evaporation residues with mass numbers 108 < ∼ A < ∼ 116 and charge states 25 ≤ q ≤ 27 were transported to the focal plane.…”

Section: Methodsmentioning

confidence: 99%

γ-ray spectroscopy of the odd-oddN=Z+2deformed proton emitter112Cs

et al. 2012

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Section: Methodsmentioning

confidence: 99%

γ-ray spectroscopy of the odd-oddN=Z+2deformed proton emitter112Cs

et al. 2012

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“…The Microball consists of 95 CsI(Tl) scintillators, and is sufficiently compact to fit inside the Gammasphere target chamber, surrounding the target. On exiting the Gammasphere target chamber, the recoiling reaction products were dispersed according to their mass-to-charge state (M/q) ratio by the Argonne Fragment Mass Analyzer (FMA) [13], and were detected in a parallel-plate gridded-anode avalanche counter (PGAC) at the focal plane. During the experiment, three different trigger conditions were used: γγγ (Gammasphere only); γγ-neutron (Neutron Shell); or γγ-recoil (FMA focal-plane PGAC).…”

Section: Methodsmentioning

confidence: 99%

“…In the present work, an experiment has been carried out using Gammasphere [8], together with the Washington University Microball [9,10] and Neutron Shell [11,12] and the Argonne Fragment Mass Analyzer [13], in order to study excited states in the very neutron-deficient cerium isotopes. The observation of excited states in 122 Ce in this experiment has been reported elsewhere [14].…”

mentioning

confidence: 99%

γ-ray spectroscopy of neutron-deficient123Ce

et al. 2012

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“…30 Mg was populated with the 14 C( 18 O,2p) reaction which provides access to states of higher energy and spin than had been studied previously. The cross section for the reaction channel of interest being rather small, the measurement required the resolving power of the Gammasphere array [3] in combination with the mass and isotope selection provided by the Argonne fragment mass analyzer [11]. The 30 Mg level scheme can be found in figure 4 of [10]: of the 11 transitions identified, only two had been reported previously.…”

Section: Structure Of 30 Mg and Cross-shell Excitations Near The Islamentioning

confidence: 99%

Tracking changes in shell structure in neutron-rich nuclei as a function of spin

Janssens

2013

Phys. Scr.

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PAPERTracking changes in shell structure in neutron-rich nuclei as a function of spin Abstract Taking advantage of the resolving power of modern gamma-ray spectrometers in combination with different types of nuclear reactions, it has been possible to investigate to fairly high-spin neutron-rich nuclei in a number of regions of the nuclear chart. The primary motivations for such studies are to characterize changes in shell structure as a function of the neutron-to-proton ratio and to document the impact of a large neutron excess on global properties, such as the nuclear shape. Recent data on nuclei close to the 'island of inversion' near 32 Mg are discussed first. They highlight challenges in describing the observations with modern effective interactions. Subsequently, the nature of excitations in neutron-rich fpg-shell nuclei between Ca and Ni is reviewed. A neutron sub-shell closure at N = 32 has been attributed to the monopole tensor force. Furthermore, the presence of collective excitations at moderate spin in neutron-rich Cr and Fe isotopes illustrates the role of the g 9/2 orbital in driving the nuclear shape. The observations suggest that mixing between 'deformed' and 'shell-model' states needs to be considered. Finally, recent results in the direct vicinity of 68 Ni indicate that the impact of the N = 40 neutron shell closure is rather modest.

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Startup of the Fragment Mass Analyzer at ATLAS

Cited by 249 publications

References 4 publications

γ-ray spectroscopy of the odd-oddN=Z+2deformed proton emitter112Cs

γ-ray spectroscopy of the odd-oddN=Z+2deformed proton emitter112Cs

γ-ray spectroscopy of neutron-deficient123Ce

Tracking changes in shell structure in neutron-rich nuclei as a function of spin

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