M. B. Gómez et al. SEN, UPC, Barcelona Total Absorption  - Ray Spectrometer: DTAS 4  Neutron Counter: BELEN Neutron Time of Flight Spectrometer: MONSTER Data Bases wrong! DTAS provides data free of systematic errors BELEN provides P n MONSTER provides the E n and the strength above S n At DESPEC one or more of the following instruments will be used to study β-strength distributions: Introduction Berta Rubio Kolkata 2012

M. B. Gómez et al. SEN, UPC, Barcelona BEta deLayEd Neutron detector (BELEN)  2.5cm  60cm 3He counters BELEN-20: BELEN-30: BELEN-44: BELEN-50: BELEN-44 R hole = 8cm R 1st = 11cm R 2nd = 16cm R 3rd = 20cm Currently at LND:  Monte Carlo simulations of new configurations under way UPC-Barcelona, IFIC-Valencia, U.Giessen/GSI, CIEMAT-Madrid, JINR-Dubna

M. B. Gómez et al. SEN, UPC, Barcelona M. B. Gómez Hornillos, R. Caballero, A. Riego G. Cortés, A. Poch, C. Pretel, F. Calviño SEN, UNIVERSIDAD POLITÉCNICA DE CATALUÑA Barcelona, SPAIN J.L. Taín, A. Algora, C. Domingo-Pardo, J. Agramunt, and Gamma Spectroscopy Group IFIC- Valencia, SPAIN D. Cano, T. Martínez, A. García and Nuclear Innovation Group CIEMAT-Madrid, SPAIN I.Dillmann (LISA-Group) Uni Giessen and GSI, GERMANY A.Yeremin, A.Popeko, E. Sokol JINR, RUSSIA Slides by Cesar Domingo Pardo, Kalkata 2012 BEta deLayEd Neutron detector

M. B. Gómez et al. SEN, UPC, Barcelona Latest Pn measurements program Neutron number N GSI:S410 “Measurement of β-delayed neutrons around the 3 rd r-process peak” C. Domingo-Pardo et al. PERFORMED, September 2011 GSI: S323 “Beta-decay of very neutron-rich Rh, Pd, Ag nuclei including the r- process waiting point 128 Pd”. F. Montes et al. PERFORMED, September 2011 Z=28, N=50; I162 “Delayed neutron measurements for advanced reactor technologies and astrophysics” JL Taín, MB Gómez Hornillos JYFL. Expected 2012 Z=50, N=82 M. B. Gómez et al. SEN, UPC, Barcelona Kalkata 2012

M. B. Gómez et al. SEN, UPC, Barcelona Z A/Z Pb Tl Hg Au Bi Po At Rn A= A= A= A= A= A= A= Measurement of beta delayed neutron emission of astrophysical interest at GSI: PRELIMINARY ANALYSIS Previous most recent studies in this region: halflives for 219 Bi and 211,212,213 Tl Phys.Lett. B 715 (2012) , G.Benzoni et al. Kalkata 2012 NEW

M. B. Gómez et al. SEN, UPC, Barcelona 216 Po Measurement of beta-decay halflives (benchmark test via 216 Po) Implant-  forward Implant-  backward  t 1/2 = 150 ms PID Confirmation Validation of time-correlation between implant and decay events: half-life measurements RIB A B C Time correlations of implants and decays: Time (a.u.)  216 Po Implant events Time distributions of implants and decays: Kalkata 2012

M. B. Gómez et al. SEN, UPC, Barcelona Measurement of beta delayed neutron emission of astrophysical interest at GSI: PRELIMINARY ANALYSIS Counts M. B. Gómez et al. SEN, UPC, Barcelona BELEN-30 Performance test via decay-neutron time correlations for 213 Tl A B C  -decays (SIMBA) Neutrons (BELEN) Kalkata Tl Beta-delayed neutrons clearly observed. Analysis undergoing: peak area proportional to Pn-value

M. B. Gómez et al. SEN, UPC, Barcelona If FAIR were ready and if the LEB would exist we could take data already now with this nice instrument

M. B. Gómez et al. SEN, UPC, Barcelona BEta deLayEd Neutron detector M. B. Gómez et al. SEN, UPC, Barcelona BACKUP SLIDES

M. B. Gómez et al. SEN, UPC, Barcelona „BELEN-30“ (2011) 20 3 He counters (20 atm) He counters (10 atm) Efficiency (1keV-1MeV) ~40% Measurement of beta delayed neutron emission of astrophysical interest at GSI; September Cf neutron source detection efficiency:  MCNPX simulation: (34.5±0.5) %  Triggerless DACQ (IFIC) in MBS : (35±1)%  Analog branch: (25±1)% M. B. Gómez et al. SEN, UPC, Barcelona GSI 2012 SEN, UPC, Barcelona GSI 2012

M. B. Gómez et al. SEN, UPC, Barcelona Experiments will be run with triggerless DACQ. Full flexibility to modify correlation time neutron emission-detection => clean data. New triggerless DACQ developped by IFIC Struck VME SIS MHz ADC signal above filter threshold (time mark) => energy filter (amplitude signal) Independent Time-Energy pairs for each channel. Data transfer to PC via the Struck SIS1100/3100 PCI/VME interface. The gasificTL DACQ software performs the system control, online analysis (event correlation), data visualization. IFIC Triggerless DACQ for neutron detector M. B. Gómez et al. SEN, UPC, Barcelona GSI 2012

M. B. Gómez et al. SEN, UPC, Barcelona BELEN-30 at GSI BELEN-30 Polyethylene shielding Isomer tagger MUSIC SIMBA implantation det M. B. Gómez et al. SEN, UPC, Barcelona BE LE N SI MB A Polyethylene shielding 2 experiments performed in September 2011 Collaboration with GSI, MSU/NSCL, TUM, UPC Barcelona, IFIC Valencia, CIEMAT Madrid GSI 2012

M. B. Gómez et al. SEN, UPC, Barcelona SIMBA Constructed and developed at Pictures: K. Steiger 1 x and 1 y-detector, 60x60x0.3 mm 3, 60fold segmented each 2 SSSSD, 60x40x1 mm 3, 7fold segmented in x 3 DSSSD (implantation area), 60x40x0.7 mm 3, 60fold segmented in x-, 40fold in y-direction 2 SSSSD, 60x40x1 mm 3, 7fold segmented in x PhD thesis C. Hinke, TUM (2010) Diploma thesis K. Steiger, TUM (2009) M. B. Gómez et al. SEN, UPC, Barcelona Tracking: (X,Y) Implants Front  - absorber Rear  - absorber DSSD:  -energy and position RIB Measurement of beta delayed neutron emission of astrophysical interest at GSI: PRELIMINARY ANALYSIS GSI 2012

M. B. Gómez et al. SEN, UPC, Barcelona New design for FAIR 3 crowns with 16 counters each at 10 atm 3 crowns with 16 counters each at 4 atm Total 96 counters GSI 2012

M. B. Gómez et al. SEN, UPC, Barcelona Further simulations to be performed, redesign detector with 90 counters Achieve high and flat efficiency. TDR in progress COUNTERS FOR BEta deLayEd Neutron detector atm UPC (refurbishment) atm GSI (LISA Group) 40 4 atm JINR DEVELOPMENT FOR FAIR Initial plans were for 44 3 He counters. Tubes from UPC, GSI & JINR => New design with 90 counters M. B. Gómez et al. SEN, UPC, Barcelona GSI 2012

M. B. Gómez et al. SEN, UPC, Barcelona Measurement of beta delayed neutron emission of astrophysical interest at GSI: PRELIMINARY ANALYSIS M. B. Gómez et al. SEN, UPC, Barcelona 205 Bi Setting 211 Hg Setting Bi Pb Tl Hg Au Z A/q

M. B. Gómez et al. SEN, UPC, Barcelona Measurement of beta delayed neutron emission of astrophysical interest at GSI: PRELIMINARY ANALYSIS M. B. Gómez et al. SEN, UPC, Barcelona 205 Bi Setting PID: 211Hg, 215Tl Comparison vs. 205Bi, g-rays from 205Bi 698 keV keV 796 keV 286 keV

M. B. Gómez et al. SEN, UPC, Barcelona Measurement of beta delayed neutron emission of astrophysical interest at GSI: PRELIMINARY ANALYSIS M. B. Gómez et al. SEN, UPC, Barcelona SIMBA Gain Matching of DSSD_Ys (3x32strips) Pulser with 15 different amplitudes. Each peak position fitted automatically for all Y-strips: 3 DSSD x 32 Y Strips Each strip adjusted in the linear range to a straight-line (a line+exponential turned out to worse the quality of the fit in the linear range) Tracking: (X,Y) Implants Front  - absorber Rear  - absorber DSSD:  -energy and position RIB

M. B. Gómez et al. SEN, UPC, Barcelona N=126: GSI S410 experiment M. B. Gómez et al. SEN, UPC, Barcelona N=126 t 1/2 existsidentified Area of interest P n (%) QRPA S n = 2-3 MeV Centered

M. B. Gómez et al. SEN, UPC, Barcelona Measurement of beta delayed neutron emission of astrophysical interest at GSI: PRELIMINARY ANALYSIS M. B. Gómez et al. SEN, UPC, Barcelona Pulser Noise Neutron signal Counts Energy (ch) Energy deposited in 3 He neutron counters.

M. B. Gómez et al. SEN, UPC, Barcelona Measurement of beta delayed neutron emission of astrophysical interest at GSI: PRELIMINARY ANALYSIS M. B. Gómez et al. SEN, UPC, Barcelona SIMBA: Energy deposited in Si strips Strip # Energy deposited (ch) Implantation Noise Beta decay

M. B. Gómez et al. SEN, UPC, Barcelona N=82 N=82: GSI S323 experiment M. B. Gómez et al. SEN, UPC, Barcelona t 1/2 existsidentified P n (%) QRPA S n = 2-3 MeV Centered

M. B. Gómez et al. SEN, UPC, Barcelona AIM of project: Design and explotation of detector for FAIR. The aim is to design and build a neutron detector and its acquisition system for FAIR and other facilities and exploit it scientifically. 44 Counters2527 LND Gas 3 He Effective length (mm)604.8 Effective diameter (mm)24.38 Gas pressure (torr)10 atm Cathode materialStainless steel Triggerless DACQ. Full flexibility to modify correlation time neutron emission-detection => clean data Correlation window 1ms with minimum dead time (~ 2 %) M. B. Gómez et al. SEN, UPC, Barcelona

Scientific Motivation around r-process Explosive nucleosynthesis and the r-process around the third abundance peak Effect of half-lives: The Astr. Jour., 579 (2002), H. Schatz et al. Proc. CGS-13 (2009), G. Martinez-Pinedo “Ignorance”-Curve Focus of present proposals: r-path M. B. Gómez et al. SEN, UPC, Barcelona

Difficult to calculate/predict half-live and Pn-values of the nuclei in this region: FRDM + QRPA K.-L. Kratz, (private communication) DF3 + QRPA + FRDM + QRPA Exp. T. Kurtukian et al. T. Kurtukian-Nieto, et al., Phys. Lett. B (Submitted) K.-L. Kratz, (private communication) (I.Borzov, et al. 2003) (P.Moeller, et al. 2003) Scientific Motivation around r-process

M. B. Gómez et al. SEN, UPC, Barcelona Simulations with MCNPX and GEANT4 Simulations have been performed with MCNPX to decide the optimal placement of the detectors. Once the final configuration was obtained, GEANT4 was used to obtain the spectra of the energy deposited in the crowns and the time distribution of the neutron detection. M. B. Gómez et al. SEN, UPC, Barcelona

Neutron counters from JINR NEUTRON COUNTERS: 4 bars of 3 He, length 50 cm, diameter 3 cm Specifically for PRESPEC/DESPEC 20 counters in counters in counters in 2013 NEUTRON DETECTOR: each counter in a separate hexagonal prism of a moderator, a layer of a neutron reflector, a layer of shielding from borated polyethylene (black) DESIGN OF THE FAIR DETECTOR

M. B. Gómez et al. SEN, UPC, Barcelona Design of the prototype of the Beta Delayed Neutron detector with Monte Carlo simulations MCNPX and GEANT4. Four different versions:  BELEN-20 at 20 atms for JYFL (2 versions). Used in experiments  BELEN-30; 20 atm, 10 atm for GSI. Used in exp.  BELEN-90 for FAIR. Under design. TDR in progress. Two BELEN-20 detectors constructed at UPC workshop. Test of BELEN-20 detector with 252 Cf source at UPC laboratory. Experiment at JYFLTRAP (Finland) to measure β delayed neutron emission of fission fragments (in collaboration between UPC, IFIC and CIEMAT):  Nov 2009: 95 Rb, 88 Br, 94 Rb, 138 I.  Jul 2010 : 95 Rb, 88 Br, 85 As, 86 As, 85 Ge, 91 Br, 137 I. Neutron Background test at S4 in GSI. Background measurement at Canfranc underground laboratory. Experiment at GSI with BELEN-30 & SIMBA September 2011, nuclei of astrophysical interest:  S323: 127 Pd, 126 Pd, 128 Ag  S410: 215 Tl, 211 Hg M. B. Gómez et al. SEN, UPC, Barcelona SUMMARY OF ACTIVITIES WITH NEUTRON COUNTERS

M. B. Gómez et al. SEN, UPC, Barcelona “Decay properties of beta delayed neutron emitters” M.B. Gómez Hornillos et al. § Nov 2009: Isótopos medidos 95Rb, 88Br, 94Rb, 138I. § Jul 2010 : Isótopos medidos 95Rb, 88Br, 85As, 86As, 85Ge, 91Br, 137I.