MINIBALL A Ge detector array for radioactive ion beam facilities

Eberth, J.; Pascovici, G.; Thomas, H. G.; Warr, N.; Weißhaar, D.; Habs, D.; Reiter, P.; Thirolf, P. G.; Schwalm, D.; Gund, C.; Scheit, H.; Lauer, M.; Duppen, P. Van; Franchoo, S.; Huyse, M.; Lieder, R.M.; Gast, W.; Gerl, J.; Lieb, Klaus

doi:10.1016/s0146-6410(01)00145-4

Cited by 152 publications

(50 citation statements)

References 3 publications

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“…The setup consisted of the MINIBALL germanium detector array [40,41] in combination with the T-REX silicon detector setup [42]. The T-REX was used to detect the light charged particles from the reaction.…”

Section: The Experimental Proceduresmentioning

confidence: 99%

Experimental study of bound states in12Be through low-energy11Be(d,p)
Johansen¹,
Bildstein²,
Borge³
et al. 2013
Phys. Rev. C
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The bound states of 12 Be have been studied through a 11 Be(d,p) 12 Be transfer reaction experiment in inverse kinematics. A 2.8 MeV/u beam of 11 Be was produced using the REX-ISOLDE facility at CERN. The outgoing protons were detected with the T-REX silicon detector array. The MINIBALL germanium array was used to detect gamma rays from the excited states in 12 Be. The gamma-ray detection enabled a clear identification of the four known bound states in 12 Be, and each of the states has been studied individually. Differential cross sections over a large angular range have been extracted. Spectroscopic factors for each of the states have been determined from distorted wave Born approximation (DWBA) calculations and have been compared to previous experimental and theoretical results.

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Section: The Experimental Proceduresmentioning

confidence: 99%

Experimental study of bound states in12Be through low-energy11Be(d,p)
Johansen¹,
Bildstein²,
Borge³
et al. 2013
Phys. Rev. C
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28
3
18
0
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“…De-excitation γ rays following Coulomb excitation of projectile and target nuclei were detected by the MINIBALL γ -ray spectrometer, consisting of eight triple cluster detectors in close geometry, each containing three sixfold segmented HPGe crystals [38,40]. To calibrate the MINIBALL clusters and to determine their individual, energy-dependent efficiency down to 50 keV, 60 Co, 133 Ba, and 152 Eu sources were mounted onto the target frame at target position.…”

Section: Experimental Setup and Data Analysismentioning

confidence: 99%

Coulomb excitation of29,30Na: Mapping the borders of the island of inversion

Seidlitz¹,

Reiter²,

Altenkirch³

et al. 2014

Phys. Rev. C

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Nuclear shell evolution in neutron-rich Na nuclei around N = 20 was studied by determining reduced transition probabilities, i.e., B(E2) and B(M1) values, in order to map the border of the island of inversion. To this end Coulomb-excitation experiments, employing radioactive 29,30 Na beams with a final beam energy of 2.85 MeV/nucleon, were performed at REX-ISOLDE, CERN. De-excitation γ rays were detected by the MINIBALL γ -ray spectrometer in coincidence with scattered particles in a segmented Si detector. Transition probabilities to excited states were deduced. The measured B(E2) values agree well with shell-model predictions, supporting the idea that in the Na isotopic chain the ground-state wave function contains significant intruder admixture already at N = 18, with N = 19 having an almost pure two-particle-two-hole deformed ground-state configuration.

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“…The aim of the present work was to extend the known level scheme and remove the spin ambiguity for the side band. Therefore we performed a complete γ spectroscopy experiment using the new Miniball spectrometer [11], which has been designed as an extremely efficient array for the detection of low multiplicity γ events.The population of non-yrast states in 48 Cr was carried out following the 46 Ti( 3 He,n) reaction at the FN tandem accelerator of the University of Cologne. The Miniball spectrometer was used to measure γγ coincidence events.…”

mentioning

confidence: 99%

“…A detailed description of the detectors and the spectrometer frame can be found in Ref. [11].The target consisted of a self-supporting foil of 0.94 mg/cm 2 46 Ti , which was bombarded at 7, 8, 10, and 12 MeV beam energy for a total of about 56 hours measuring time. The sorting of the recorded γγ coincidences resulted in four matrices of 4k×4k resolution, containing 1.9, 2.8, 4.5, and 2.9 × 10 8 γγ coincidence events, respectively.…”

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confidence: 99%

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Investigation of low spin states inCr48with the MINIBALLγ-ray spectrometer

Jessen

Dewald²,

Eberth³

et al. 2003

Phys. Rev. C

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Low spin states in the self-conjugate even-even nucleus 48 Cr were investigated using the Miniball γ-ray spectrometer. At the FN tandem accelerator in Cologne the 46 Ti( 3 He,n) reaction was used for the measurement of γγ coincidences for an excitation function from 7 to 12 MeV beam energy. 17 excited states were observed, nine for the first time by means of γ-ray spectroscopy, and new spin assignments were made. No excited states apart from the ground band were observed below 3.4 MeV. PACS number(s): 21.10. Hw, 25.70.Gh, 27.40.+z Much experimental and theoretical work has recently been devoted to the investigation of self-conjugate nuclei, which exhibit unique and interesting properties. For example, they are the only nuclei in which isospin zero states (T = 0), nearly degenerate isospin doublets, and large isovector M 1 transitions can be found. In particular the N = Z nucleus 48 Cr, placed amidst the doubly magic nuclei 40 Ca and 56 Ni, has been the subject of recent studies [1,2,3,4,5,6,7]. The ground state rotational band of 48 Cr has been successfully described both by the shell model [5] and the collective model [6]. The latter approach shows 48 Cr as a deformed rotor. On the other hand the shell model reproduces the states of the yrast structure impressively well and predicts many additional states above the pairing gap of about 3 MeV. So far these additional states had not been observed experimentally. The question of their existence puts the shell model to a crucial test. A recent 40 Ca+α+α cluster model approach [7] also describes level energies and B(E2) values of the ground band very well and also predicts many so far unobserved states.Early particle-spectroscopic works on the energy levels of 48 Cr following the (p,t) reaction had shown that about nine excited states are to be found at level energies between 3.4 and 6.1 MeV [8,9,10]. Recent measurements used heavy ion induced reactions to examine both yrast and non-yrast structures of 48 Cr [1,2,3]. The non-yrast states were assumed to belong to a K π = (4 − ) band, but the spin and parity assignments had only been tentative [3]. The aim of the present work was to extend the known level scheme and remove the spin ambiguity for the side band. Therefore we performed a complete γ spectroscopy experiment using the new Miniball spectrometer [11], which has been designed as an extremely efficient array for the detection of low multiplicity γ events.The population of non-yrast states in 48 Cr was carried out following the 46 Ti( 3 He,n) reaction at the FN tandem accelerator of the University of Cologne. The Miniball spectrometer was used to measure γγ coincidence events. It was designed to have a high full-energy peak efficiency and effective granularity, needed for the Doppler correction of γ-rays emitted by fast recoiling nuclei. Miniball was equipped with 18 6-fold segmented encapsulated Ge detectors, clustered in six Triple-Cluster cryostats with three detectors each. For this experiment we used only the total energy signal, which is read out from...

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MINIBALL A Ge detector array for radioactive ion beam facilities

Cited by 152 publications

References 3 publications

Experimental study of bound states in12Be through low-energy11Be(d,p)
Johansen¹,
Bildstein²,
Borge³
et al. 2013
Phys. Rev. C
Self Cite
28
3
18
0
View full text Add to dashboard Cite

Experimental study of bound states in12Be through low-energy11Be(d,p)
Johansen¹,
Bildstein²,
Borge³
et al. 2013
Phys. Rev. C
Self Cite
28
3
18
0
View full text Add to dashboard Cite

Coulomb excitation of29,30Na: Mapping the borders of the island of inversion

Investigation of low spin states inCr48with the MINIBALLγ-ray spectrometer

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MINIBALL A Ge detector array for radioactive ion beam facilities

Cited by 152 publications

References 3 publications

Experimental study of bound states in12Be through low-energy11Be(d,p)Johansen1, Bildstein2, Borge3 et al. 2013Phys. Rev. CSelf Cite283180View full textAdd to dashboardCite

Experimental study of bound states in12Be through low-energy11Be(d,p)Johansen1, Bildstein2, Borge3 et al. 2013Phys. Rev. CSelf Cite283180View full textAdd to dashboardCite

Coulomb excitation of29,30Na: Mapping the borders of the island of inversion

Investigation of low spin states inCr48with the MINIBALLγ-ray spectrometer

Contact Info

Product

Resources

About

Experimental study of bound states in12Be through low-energy11Be(d,p)
Johansen¹,
Bildstein²,
Borge³
et al. 2013
Phys. Rev. C
Self Cite
28
3
18
0
View full text Add to dashboard Cite

Experimental study of bound states in12Be through low-energy11Be(d,p)
Johansen¹,
Bildstein²,
Borge³
et al. 2013
Phys. Rev. C
Self Cite
28
3
18
0
View full text Add to dashboard Cite