ELOG DESPEC

AIDA GELINA BRIKEN nToF CRIB ISOLDE CIRCE nTOFCapture DESPEC DTAS EDI_PSA 179Ta CARME StellarModelling DCF K40

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Entry time:	Tue Mar 25 20:27:11 2025
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Start 00:43 22.2.25 https://elog.gsi.de/despec/G-24-00302/57 AIDA data file R9_85 Converting hexadecimal timestamp to decimal: 1740181266259754800 Assuming that this timestamp is in nanoseconds (1 billionth of a second): GMT: Friday, February 21, 2025 11:41:06.259 PM Your time zone: Friday, February 21, 2025 11:41:06.259 PM GMT+00:00 End 12:56 22.2.25 https://elog.gsi.de/despec/G-24-00302/85 (start of next degrader setting) AIDA data file R9_199 Converting hexadecimal timestamp to decimal: 1740224934731157800 Assuming that this timestamp is in nanoseconds (1 billionth of a second): GMT: Saturday, February 22, 2025 11:48:54.731 AM Your time zone: Saturday, February 22, 2025 11:48:54.731 AM GMT+00:00 Analysis data files FEB25/R9_85 and FEB25/R9_199 - no timewarps - deadtime aida05 c. 37% and 39% due to high SC41 scaler input to MACB - issue subsequently fixed - deadtime aida04 c. 4%, all other FEE64s <<1% FEE64 configuration FEE64 a b c g h d e f a b c d e f g h DSSSD#1 15 3 12 9 1 5 2 4 n+n Ohmic FEE64s 2, 4 Data analysis assumes - all LEC ADC data channels with valid ADC offset included (507 of 512 channels) LEC calibration ADC offset only - no clustering - no multiplex timestamp correction - no p+n junction side - n+n Ohmic side correlation time gates - FEE64 not DSSSD strip ordering - hardware - slow comparator setting p+n junction FEE64s 100keV, n+n Ohmic FEE64s 150keV - LEC energy difference +/- 168keV - HEC energy difference +/- 1.68GeV - valid LEC events p+n junction side multiplicity = 1 and n+n Ohmic side multiplicity = 1 151keV < LEC energy < 1000keV to select candidate beta events standalone analysis of AIDA data, no downstream veto detector - valid HEC events p+n junction side multiplicity > 0 and n+n Ohmic side multiplicity > 0 (x,y) strips corresponding to maximum energy p+n junction and n+n Ohmic side HEC - HEC veto not available - only 1x AIDA DSSSD installed - per pixel implant-decay correlations - end of event difference in WR timestamp between successive ADC data items > 2500 and overall event length < 33us per FEE64 LEC ADC data items 268ms/channel - attachments 3-5 - all - 150keV < energy < 1500keV - energy > 1500keV absence of high instantaneous rates on spill cf. S181, S100, S505 etc spill structure visible for energies > 1500keV - probably to be expected as majority of such events should be light ions per FEE64 HEC ADC data items 268ms/channel - attachments 6-8 - all - 100MeV < energy < 1000MeV - energy > 1000MeV Implant & decay event rates 262us/channel - attachment 9 LEC m_p versus m_n - attachment 10 LEC e_p versus e_n - 20keV/channel - attachment 11 HEC x strip versus y strip - attachment 12 - HEC-LEC implant decay time difference <1s - HEC-LEC implant decay time difference <100s shows x-y window used to select 82Nb events HEC m_p versus m_n - attachment 13 HEC e_p versus e_n - 20MeV/channel - attachment 14 HEC-LEC implant-decay time difference (4ms/channel) versus - attachment 15 - HEC energy - LEC energy - x & y strip x strips 130 & 136 disabled HEC & LEC p strip - n strip time difference (2us/channel, offset=2000 channels) - attachment 16 HEC E (20MeV/channel) versus implant-decay time difference (4.194ms/channel) - attachment 17 LEC E (20keV/channel) versus implant-decay time difference (4.194ms/channel) - attachment 18 LEC e_p - e_n (5.6keV/channel) versus implant-decay time difference (4.194ms/channel) - attachment 19 HEC x & y strip versus implant-decay time difference (4.194ms/channel) - attachment 20 HEC-LEC implant-decay time difference (8.389ms/channel) for candidate 82Nb events - attachment 21 - blue - forward - cyan - backward Note - no FRS PID - no HEC dE - no HEC veto - no HEC energy gates - assume all events within x-y window stop in AIDA DSSSD - 82Nb events known to overlap in x-y with (longer-lived, more numerous) 83Nb events - no front-back time difference - no clustering - all LEC channels with valid ADC offsets (507 of 512) included except 2x strips 130 & 136 HEC-LEC implant-decay time difference (8.389ms/channel) for candidate 82Nb events - attachment 22 Weighted least squares fit channels 1-12 half life 55(9)ms cf. NNDC 50.0(3)ms. Encoding: HTML ELCode plain Suppress Email notification

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