Ackermann, D.

Hessberger, F.

Hoffmann, J.

Kurz, N.

Maurer, J.

Mistry, A. K.

Piot, J.

Vostinar, M.

Wieczorek, P.

GSI Repository

MoDSS – a compact Mobile Decay Spectroscopy Set-up for the investigation ofheavy and superheavy nuclei after separationD. Ackermann∗1, F.P. Heßberger1,2, J. Hoffmann1, N. Kurz1, J. Maurer1, A.K. Mistry2, J. Piot3, M.Vostinar3, and P. Wieczorek11GSI, Darmstadt, Germany; 2HIM, Mainz, Germany; 3GANIL, Caen, FranceThe investigation of the nuclear structure of heavy andsuperheavy nuclei [1] relies on the performance of ad-vanced comprehensive charged particle and photon detec-tor set-ups, mounted close to the target position for in-beamdetection or designed for decay spectroscopy after an ionoptical separator, like e.g. the focal plane detector set-upTASISpec [2].We report on a new compact Mobile Decay Spec-Figure 1: Schematic view of the detector configurationconsisting of the aluminum housing of the Si-array sur-rounded by large volume Ge-detectors (two of five possibleare shown here) and the chamber accommodating the twotypes of complementary electronics.Figure 2: First α spectrum obtained at a test run at the ve-locity filter of the LISE spectrometer at GANIL using ana-log signal processing.troscopy Set-up (MoDSS) for the detection of heavy ionreaction products and its decay radiation and its first testat the LISE setup of GANIL [3], employing the reac-tion 40Ar+174Yb→214Ra∗. It consists of a combinationa 60×60 double sided silicon strip detector (DSSD) withan active area of 60×60 mm2 of 300 µm thickness, sur-rounded in its backward hemisphere by four single sidedsilicon strip detectors (SSSD) of the same dimensions sub-divided into 32 strips, forming a cube with one open faceupstream for accepting the incoming particles. The array ishoused in a compact chamber with thin aluminum windows∗ d.ackermann@gsi.de(1.5 mm) facing the backside of all five detector chips to al-low for the detection of γ-rays emitted by the reaction prod-ucts implanted in the DSSD. In Fig. 1 a schematic view ofthe set-up is shown together with the chamber, housing thetwo types of front end electronics employed for comple-mentary signal processing.0 200 400 600 800 10008500900095001000010500110001150012000FEB:  2 CH:  6Entries    1.034468e+07Mean    523.2RMS     284.6Underflow       0Overflow        0Integral  1.034e+07Skewness  -0.02695Trace  18:23:40  2014-11-18  Analysis/Histograms/Raw/Traces/FEB:  2 CH:  6Rn205,206Figure 3: Example trace for an α decay pulse collected dur-ing the test run at the LISE velocity filter using the FEBEX[4] based digital MBS electronics.For the front-end electronics there are two complemen-tary options. An analogue data processing chain consists ofa charge sensitive preamplifier (PA) developed by the elec-tronics laboratory of the Nuclear Physics Department ofthe University of Cologne followed by Mesytec SMT16+shaper and fed into an analogue data acquisition system(DAQ) on the basis of the GSI multi branch system (MBS).In Fig. 2 an α spectrum is shown, which had been obtainedat the velocity filter of the LISE spectrometer at GANIL,Caen, France. At the end of this test run the second DAQconfiguration was tested, using a set-up based on the flashADC module FEBEX3A [4] developed in-house. An ex-ample trace taken with this configuration is shown in Fig.3. As additional option the charge sensitive PA’s can besubstituted by the APFEL ASIC [5] in combination withthe FEBEX DAQ, which provides a fast shaped pulse of250 ns width and a two output signals for each input withamplification factors of 1 and 16/32 switchable.References[1] R.-D. Herzberg, P. Greenlees, Prog. Part. Nucl. Phys. 61, 674(2008)[2] L. Andersson et al., Nucl. Instr. and Meth. A 662, 164 (2010)[3] R. Anne and A.C. Mueller, Nucl. Instr. and Meth. B 70, 276(1992)[4] J. Hoffmann et al., GSI Scientific Report 2011, 253 (2012)[5] P. Wieczorek et al., GSI Scientific Report 2011,251 (2012)GSI SCIENTIFIC REPORT 2014 MU-NUSTAR-SHE-P-05DOI:10.15120/GR-2015-1-MU-NUSTAR-SHE-P-05 169

MoDSS - a compact Mobile Decay Spectroscopy Set-up for the investigation of heavy and superheavy nuclei after separation

Hessberger, F.P.

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MoDSS – a Compact Mobile Decay Spectroscopy Set-up for the Investigation ofHeavy and Superheavy Nuclei after Separation

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http://repository.gsi.de/record/183921/files/MU-NUSTAR-SHE-P-05.pdf

MoDSS - a compact Mobile Decay Spectroscopy Set-up for the investigation of heavy and superheavy nuclei after separation

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