ELOG DESPEC

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

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Entry time:	Mon Feb 9 22:45:50 2026
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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. Added 8.2.26 by TD Attachment 23 - implant timestamp, decay timestamp, decay timestamp - implant timestamp for selected events (attachment 21) with time differences < 255 x 4.194304ms Attachment 24 - implant timestamp, decay timestamp, implant timestamp - decay timestamp for selected events (attachment 21) with time differences < 255 x 4.194304ms Attachment 25 - analysis program Attachment 27 - spectra titles Attachment 28 - analysis program variables For data files R9_85 - R9_199 inclusive Total ADC data items 30117120061 Total ADC events 6551938947 Questions from Giorgio Bruni Campanella Spezza 1) What were the exact number of implants, decays, correlated implants and decays and correlation efficiency? Implants ( m_p_hec(1) > 0 .and. m_n_hec(1) > 0 ) 1046107 Decays ( m_p_lec(1) = 1 .and. m_n_lec(1) = 1 ) .and. ( ediff.LT.30 .and. ediff.GT.-30 ) 83342477 Selected implants s2112 ( 75 < x < 150 .and. 30 < y < 120 ) .and. ( ediff.LT.300 .and. ediff.GT.-300 ) .and . ( 100 < hec_e < 4096 ) 215705 = 32.0/pixel = 0.000732/pixel/s Selected decays s2040 ( 75 < x < 150 .and. 30 < y < 120 ) .and. ( ediff.LT.30 .and. ediff.GT.-30 ) .and. ( decay-implant < 1s ) .and. ( 27 < lec_e < 180 ) 1056 = 0.156/pixel = 0.00000358/pixel/s Selected decays s2041 ( 75 < x < 150 .and. 30 < y < 120 ) .and. ( ediff.LT.30 .and. ediff.GT.-30 ) .and. ( decay-implant < 100s ) .and. ( 27 < lec_e < 180 ) 38483 = 5.70/pixel = 0.000131/pixel/s 2) What is the number of correlated decays for the backward time correlations? Correlated forward decays s2226 (channels 0-255, 4.19ms/channel) = 1422 Correlated backward decays s2224 (channels 0-255, 4.19ms/channel) = 778 3) How exactly do you define beta detection efficiency for the decay of a specific isotope? I ask this due to the lack of a PID in the analysis, and hence, without any FRS-AIDA implant correlation, how can you determine the number of implanted ions of a specific isotope? Yes - to calculate beta efficiency for 82Nb (say) I need an estimate of what fraction of selected implant events are actually 82Nb 4) Do you have any vetoes for the position of implants in AIDA, or do you accept all implants throughout the DSSSD? See definitions above - there are gates for x and y strips and implant energy Encoding: HTML ELCode plain Suppress Email notification

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