用于暗物質(zhì)探測(cè)實(shí)驗(yàn)的CsI(Tl)晶體探測(cè)器性能的實(shí)驗(yàn)研究_圖文

1、 Ú 7Ú À ¾ È :Ã Ú ¦ " ô ½ â µ ® Ä Ø (ħ å ½ â ' Ñ Ü Ä µ ² Ð ¿ 733 aee of LED i s changed f m m 920 mV to 14Þ mV . m e spectm show É a them are larg

2、e quanti ti es d noi¤e- and j ust a small pazt of siP E ë en tbe vol tù " am 920 mV . 960 mV m d m m mV m peeals ti vel y . Ò 1i s is bec au se l i ghts emi tt ed by LE D sel dom a Ê ve at the sUE aee d photocathode of PMT to f induee el ectron-em tt ing - Fol i om ng &

3、#201; e inerea e d voltage , number d photons hitt i ng to phot oC ath ode of PMT i ncmasm and th e poesi bi li ty d el ectron- emi tti ng f rom the phot ocathode of PMT i ncreases too , " a peak a about 37th channel has been obeen ed , , d ual l y . TTze fact that the poeiti ons d the be seen

4、¶ tho- e spectra from conm pondi ng peak s do not change i n wi de range of vol tage d IZ D shows those peak s am ml ated to emi tÀng d one photoelectm z from PMT . u e second peak cm 11Þ mV on and thi s i s due to the emi tt i ng of two photoel ectmns fmm photocathode of PMT . u e se

5、Þ nd pe lt is about a 75 É channel . At l ast , the l i O Hng d L ED am sÊ ong enou d I to mak e PMT a em t EZ u - photoel ectmn and it cannot di -c ri mi nate the diEem nt peak s m show i n the specU2 of Zul 1260 mV ¢13Þ mV and 14Þ mV . So we a t the epeet n a whi ch v

6、ol tage i s l à £ mV ( m shown i n Fi g m 6 and get the poeiHon d photoel ect ron peak M 37 .O ó l Oc h . 131i s i s the poei Hon d photoel ectmn corÓ spond n g to si ngl e photoelect ron emi tti ng d PMTMJ . AceoE i ng to the li neari ty d energy rm poam of the expert mental sys

7、aem stm m i n Fi g . 5 , we d cm obtai n the equi val ent energy of singl e photoel ect m z emi tt i ng d PM T is 0 . 32 keV . 4 SU R ar v RE E 'IE e ti me d i n ù , ati on d c u n m t si g za l fm m PM T i n t h o- e exp e d nB u h as b een st u d i ed m d en th e ti me d i nt eF at i on i

8、 s o pt i m in d f or d iE em n t en e E e¤ . W e al so ob t ai n th e l i nea d ty of e ne rg y m ¤ g ¤p om e d exp ed men ta l sé te m m easu r i n g qu en c hi ng fact or - 'I E e eq u i v al e n t en ergy dep oei ted i n C sI ( 11 CE sta l d a si n gl e p hot oe l ec t m

9、E of PM T i s ú £u t 0 . 3 2 k eV . × E p ar am et em d en eE y cd i b m y e Z t i o n h av e b een ac h ieved h r e½ ed m en ta l sy a e m of m eaSUE n g q u en c h i n g f ac t or d t R ef eee m Ä l 2 3 Mord e- A . Nuelee ph7¤A 2 m - M 7 1 e477- 488 WANe H T . U h . 0

10、 ¤ Ø c Y a d . Aa º a ùele ph, - 6 . m o . " : 141 e. WANG M Z , YUE Otm , DENG J R a d . ¤Fe- -A ty × ,die- d wm p see ebes ÷ × C, I ( Ê SC bili intilla i ng c m td . ¤ ' "bï ¤ d ¤ Ø Phy- - ReT. . 2 M 1, C O 4 5 6 U

11、 H B . Ú U Ya . CE N c P a d . F s E- tr . Ma b - XM 1. A4, , :493 E h e1. E O Peeont S, c hm bom B . Jem- M a d . A-uopm ale FhyE . 1999 , 11:457 m Do¤- R. I- m A , RØ need G ¤¤ d . F e1. Iwa . Ma b - mx m. M s, 2623 h m c oi l ed n u c l ei . 734 ß Ü ï í

12、; ë ø " í (HE & N P Ú2 6¯ Ã Ú µ ï Ê ½ â µ é Ä CsI (TI § å ½ â ÷ ÔÜÄ µ é Ð ¿ £ À ü 1 õ Ó1 î ð 1 õ Ó´ 2 

13、5; û å 3 1 Ð ú Ƨ º ß Ð ¿ ù ,± ÷ la m 9 2 (Ð' ¸ " í Ð ¿ ù .¨ ± 3 ( ¨ Þ ó § Â ¬ ¬ .¨ ± 11 529 E Ø Ø ª ª Ú ± 

14、1; â ¿ µ ï Ê Ä µ ' ú Ð , ´ å Ë Ü ¿ Ä Quenching Factor Ç » ö Ø ª ¥ â ç ÓÄ¢ ä Î ý . Ã Í Ü X ä ß ´ Ô - apâ ¿

15、ë ä Ð Ó ý ð Ä ´ å Ë Ü ¿ £ enching Factor Ä µ ³ ø Ð Ë Ü ¿ Ì ¤ , Ã ½ Ë â × µ ³ Ä Ü ¿ ì ¦ Ø µ . Pô Ô ¦

16、Ú § å Ð Ä Ü ¿ Á ý ¼ ª 0 .32keV . ¬ ± Ð ¿ Ë » ¬ Ü ¿ Ä X ä ß ý ð Ä PWT ä ö ç ÷ ¶ Å Ä ý Ö ± ä í È ë ý Ö ç Î Ä Ø µ , Ã ½ î Ñ Ä pw r ä ö ç É Õ¯ ÷ þ . Øü ÷ ç ï Ê Ø I(Ê § å ¥ â ç Ó Ü¿