250BK 254ES A DECAY (275.7 D) 01NDS 200112
250BK H TYP=FUL$AUT=Y. Akovali$CIT=NDS 94,131 (2001)$CUT=1-Aug-2001$
254ES P 0.0 (7+) 275.7 D 5 6615.7 15
250BK N 1.0 1.0 1.0
250BK PN 2
250BK TG BERKELIUM X-RAYS:
250BK2TG
250BK3TG E(X-RAY) I(RELATIVE)
250BK4TG 1972DI02 1972DI02
250BK5TG ---------- -----------
250BK6TG 107.165 6 643 8 XKA2
250BK7TG 112.112 6 1000 XKA1
250BK8TG 125.478 10 126 4 XKB3
250BK9TG 126.582 10 222 10 XKB1
250BK2TG
250BK CG I(XKA)=0.40%, I(XKB)=0.13%, I(XL)=230% (1966MC02). FOR
250BK2CG MEASURED RELATIVE SUB L X-RAY INTENSITIES, SEE 1988PO05, 1990PO14.
250BK CG
250BK TG AG(T):
250BK2TG T1/2(97.49 LEVEL)=38 NS 5 OBTAINED BY 1966MC02 FROM (A)(63G)(T) DATA.
250BK3TG T1/2(60G IN 241AM A DECAY)=63 NS WAS USED AS A STANDARD.
250BK4TG T1/2(86.4 LEVEL)=213 US 8 OBTAINED BY 1966MC02 FROM (A)(XL)(T) DATA.
250BK TG
250BK TG GG(T):
250BK2TG T1/2(35.6 LEVEL)=29 US 1 OBTAINED BY 1966MC02 FROM (XL)(35.5G)(T) DATA,
250BK3TG AND ALSO FROM (XL)(XL)(T) DATA. THE 29-US DELAY WAS FOUND
250BK4TG TO FOLLOW THE 213-US DELAY.
250BK5TG
250BK CG AG: SEE 1966MC02.
250BK CG
250BK CL 1982KOZZ REPORTED THAT 35 ALPHA AND 45 GAMMA TRANSITIONS
250BK2CL WERE IDENTIFIED VIA THEIR ALPHA, GAMMA AND CE SINGLES AND COINCIDENCE
250BK3CL SPECTRA. THE LOW-LYING ROTATIONAL BANDS, WHICH WERE PREVIOUSLY
250BK4CL IDENTIFIED BY 1966MC02, WERE CONFIRMED. TWO NEW K=6 BANDS,
250BK5CL 6+,(p 7/2[633]+n 5/2[622]) AT 355.3 KEV AND
250BK5CL 6+,(p 5/2[642]+n 7/2[613]) AT 406.3 KEV, AND TWO ADDITIONAL STATES
250BK6CL AT 316.1 WITH K=5+, AND AT 551.8 WITH POSSIBLY K=8 WERE
250BK7CL PROPOSED.
250BK CL NO LEVEL AT ABOUT 355.3 KEV WAS IDENTIFIED IN (N,G)
250BK2CL REACTION. HOWEVER, THE 6+,(p 7/2[633]+n 5/2[622]) STATE WAS
250BK3CL ASSIGNED BY 1985HOZM TO A LEVEL AT 552 KEV FROM THEIR (N,G) DATA. AN
250BK4CL ALPHA TRANSITION TO SUCH A STATE WOULD BE EXPECTED. HOWEVER, SINCE
250BK5CL DATA ON FEEDING AND DE-EXCITING THESE TWO LEVELS ARE NOT AVAILABLE,
250BK6CL NO RECOMMENDATION ARE GIVEN HERE.
250BK CL AN ALPHA FROM JPI=7+,K=7,(p 7/2[633],n 7/2[613]) PARENT
250BK2CL TO 5+,(p 7/2[633],n 3/2[622]) STATE AT 316 KEV, ALSO PROPOSED
250BK3CL FROM (N,G) WORK, SHOULD HAVE A LARGE ALPHA-HINDRANCE
250BK4CL FACTOR. ITS INTENSITY IS NOT AVAILABLE AT THIS TIME, THEREFORE ITS
250BK5CL HINDRANCE FACTOR COULD NOT BE CALCULATED TO VERIFY THE ASSIGNMENT.
250BK CL A LEVEL AT 406 KEV WAS OBSERVED IN (N,G) REACTION BY
250BK2CL 1985HOZM AND JPI=6+, K=6 (p 5/2[642],n 7/2[613]) WAS ASSIGNED.
250BK3CL ALPHA TRANSITION TO SUCH A STATE WOULD BE EXPECTED. THEREFORE, THE
250BK4CL LEVEL OBSERVED IN 254ES A DECAY AT 406.3 KEV IS PROBABLY THE 6+ STATE
250BK5CL PROPOSED AT 406 KEV FROM THE (N,G) DATA, AND PRESUMABLY DIFFERENT
250BK6CL THAN THE ONE OBSERVED BY 1966MC02 AND 1972BB24 AT 414 2 KEV.
250BK CL SINCE THESE INTERPRETATIONS ARE PRELIMINARY, THE A DECAY
250BK2CL WORK OF 1982KOZZ HAS NOT BEEN INCLUDED HERE.
250BK CL E,J SEE ADOPTED LEVELS
250BK CL BAND(A) K=2,(p 3/2[521],n 1/2[620]) BAND
250BK CL BAND(B) K=4,(p 7/2[633],n 1/2[620]) BAND
250BK CL BAND(D) K=5,(p 3/2[521],n 7/2[613]) BAND
250BK CL BAND(I) K=7,(p 7/2[633],n 7/2[613]) BAND
250BK CL E(M) THE AUTHORS OF 1966MC02 TENTATIVELY SUGGESTED THAT THE
250BK2CL LEVELS POPULATED AT 413, 471 AND 527 MIGHT BE MEMBERS OF A ROTATIONAL
250BK3CL BAND.
250BK CG E MEASUREMENTS OF 1966MC02, UNLESS NOTED OTHERWISE. EG'S ARE
250BK2CG ACCURATE TO +-2 KEV (1966MC02). OTHER MEASUREMENT: 1988PO05
250BK3CG (SEE ALSO 1991PO17).
250BK CG RI PHOTON INTENSITY PER 100 ALPHA DECAYS, MEASURED BY 1966MC02,
250BK2CG EXCEPT WHERE NOTED. IG'S MEASURED BY 1988PO05 AND 1966MC02 DO NOT AGREE
250BK3CG WELL. INTENSITIES LISTED IN 1988PO05 ARE QUOTED FOR COMPARISON. THE
250BK4CG PHOTON INTENSITIES ARE ACCURATE TO ABOUT 15% (1966MC02).
250BK CG M MULTIPOLARITIES WERE DEDUCED BY 1966MC02 FROM THEIR CE DATA
250BK2CG (QUALITATIVE INTENSITIES WERE LISTED ONLY).
250BK CG TI TRANSITION INTENSITY PER 100 ALPHA DECAYS, OBTAINED BY
250BK2CG 1966MC02 FROM THEIR CE DATA, EXCEPT WHERE NOTED.
250BK CG E(E) TRANSITION NOT OBSERVED; ENERGY IS FROM LEVEL SCHEME
250BK CG E(S) NOT OBSERVED IN 254ES A DECAY; EG IS FROM (N,G)
250BK CA E MEASUREMENTS OF 1972BB24, EXCEPT WHERE NOTED; OTHER
250BK2CA MEASUREMENTS: 1966MC02, 1971BB10, 1972HAWO. ENERGIES MEASURED BY
250BK3CA 1972BB24 ARE DECREASED HERE BY 0.2 KEV, AS RECOMMENDED BY 1991RY01,
250BK4CA DUE TO CHANGES IN CALIBRATION ENERGY. THE UNCERTAINTIES ON ENERGIES
250BK5CA WERE NOT WORSE THAN 1 - 2 KEV (1972BB24). THE ORIGINAL ENERGIES OF
250BK6CA 1966MC02 ARE DECREASED BY 8 KEV BECAUSE OF THE CALIBRATION ENERGY USED.
250BK CA IA ALPHA INTENSITY PER 100 A DECAYS, MEASURED BY 1972BB24 AND
250BK2CA 1966MC02. THE ALPHA'S GIVEN BY 1972BB24 WITH UPPER LIMITS ON
250BK3CA INTENSITIES, ARE ASSUMED THAT THEY WERE NOT OBSERVED BY THEM, IF THESE
250BK4CA ALPHA WERE NOT SEEN BY 1966MC02.
250BK CA HF CALCULATED BY USING R0(250BK)=1.502 3.
250BK G 264 2 0.05 1
250BK G 278 2 0.03 1
250BK CG THE 278G MIGHT DEEXCITE THE LEVEL AT 527 TO THE 247.9-KEV
250BK2CG LEVEL. THIS PLACEMENT WOULD BE CONSISTENT WITH THE SUGGESTION THAT
250BK3CG THE 413-, 471- AND 527-KEV LEVELS MAY BE THE 6+, 7+, AND 8+ MEMBERS
250BK4CG OF K=6 BAND, RESPECTIVELY.
250BK G 285 AP 0.01
250BK CG RI(290G)=0.3% 1 IS LISTED IN 1988PO05.
250BK CG TRANSITION IS QUESTIONABLE.
250BK G 342 2 0.009 2
250BK CG RI(340G)=0.04% 2 IS LISTED IN 1988PO05.
250BK G 348 2 0.007 1
250BK G 377 2 0.015 2
250BK CG RI(375G)=0.05% 3 IS LISTED IN 1988PO05.
250BK G 385 2 0.05 1
250BK CG RI(390G)=0.4% 1 IS LISTED IN 1988PO05.
250BK A 6512 AP 0.005 LE 1.3E+5 GE ?
250BK CA IA AP 0.0046 WAS MEASURED BY 1972BB24 AND IA LE 0.005 BY
250BK2CA 1966MC02. IF THERE IS ANY ALPHA TRANSITION TO THE 250BK GS WITH MAIN
250BK3CA CONFIGURATION OF K=2,(p 3/2[521],n 1/2[620]) FROM THE 254ES GS WITH
250BK4CA MAIN CONFIGURATION OF K=7,(p 7/2[633],n 7/2[613]), THE TRANSITION
250BK5CA SHOULD TAKE PLACE VIA SOME CONFIGURATION ADMIXTURES IN THEIR
250BK6CA RESPECTIVE GROUND STATES.
250BK A 6478 0.05 LE ?
250BK CA THIS ALPHA WAS NOT OBSERVED BY 1966MC02; IA LE 0.05 WAS
250BK2CA LISTED BY 1972BB24. AS IN THE CASE OF AN ALPHA DECAY TO THE GS, THE
250BK3CA PROBABILITY OF AN ALPHA TRANSITION FROM
250BK4CA { 7+,7(p 7/2[633],n 7/2[613]) } PARENT STATE TO
250BK5CA JPI=3-, K=2 (p 3/2[521],n 1/2[620]) STATE WHICH WOULD INVOLVE
250BK6CA CHANGES IN BOTH PROTON AND NEUTRON STATES, SHOULD BE SMALL.
250BK7CA SOME CONFIGURATION ADMIXTURES IN PARENT OR/AND DAUGHTER LEVEL(S)
250BK8CA WOULD EXPLAIN THE TRANSITION, IF ASSIGNMENT OF THIS 6478A TO 275.7-D
250BK9CA 254ES DECAY IS CORRECT.
250BK L 0.0 2- 3.212 H 5 A
250BK L 34.47 (3-) A
250BK G 34.4 (M1,E2) 30 AP
250BK L 35.59 (4+) 29 US 1 B
250BK A 6476 AP 0.23 4 2190 40
250BK CA LISTED INTENSITIES ARE: 0.27 (1966MC02), GE 0.18 (1972BB24).
250BK G 1.12 E S
250BK CG TI AP 30 FROM INTENSITY BALANCE AT THE 34.47-KEV LEVEL, IF
250BK2CG THERE ARE NO OTHER GAMMA TRANSITIONS FEEDING THE 35.59-KEV LEVEL.
250BK G 35.5 (M2) 1.287E4 70 AP
250BKS G LC=9320 $ MC=2790 $
250BK L 78.33 (5+) B
250BK A 6435 AP 0.03 AP 10600 AP
250BK CA THIS ALPHA WAS NOT OBSERVED BY 1966MC02.
250BK G 42.6 (M1,E2) 100
250BK L 80.26 (4-) A
250BK G 45.79 (M1+E2) S S
250BK G 80.26 (E2) S S
250BK L 86 2 (7+) 213 US 8 I
250BK DL E THE EA(TO THIS LEVEL)-EA(TO THE 97.49-KEV LEVEL) YIELD
250BK2DL E(LEVEL)=84.1 22; EG=385 2 FROM 472-KEV LEVEL GIVES E(LEVEL)=87 3.
250BK A 6428.6 15 93.1 1 3.2 1
250BK G 8 E S
250BK2 G FL=78.33
250BK L 97.49 (5-) 38 NS 5 D
250BK A 6415.4 15 1.8 1 144 10
250BK G 63 2 2.0 2 (E1) 0.508
250BK2 G FL=35.59
250BK CG RI IG=1.6% 4 WAS MEASURED BY 1988PO05.
250BKS G LC=0.363 $ MC=0.0908 $ NC+=0.0323 $
250BK CG M FROM NONOBSERVATION OF CONVERSION ELECTRONS, 1966MC02
250BK2CG DEDUCED THAT THIS GAMMA IS AN E1 TRANSITION.
250BK CG THIS GAMMA'S PLACEMENT BETWEEN THE 97.49- AND 35.59-KEV
250BK2CG LEVELS IS NOT CONSISTENT WITH CONFIGURATION ASSIGNED FOR THESE
250BK3CG LEVELS: THE TRANSITION FROM THE (p 3/2[521],n 7/2[613]) STATE
250BK4CG TO THE { (p 7/2[633],n 1/2[620]) } STATE WOULD REQUIRE BOTH PROTON
250BK5CG AND NEUTRON STATES TO CHANGE. SOME CONFIGURATION MIXING
250BK6CG IN EITHER OR BOTH OF THESE LEVELS CAN EXPLAIN THIS TRANSITION.
250BK L 130.49 (6+) B
250BK A 6383 2 0.1 LT 1800 GT
250BK CA LISTED INTENSITIES ARE 0.13 (1966MC02), <0.1 (1972BB24).
250BK G 52.16 S S
250BK G 94.91 S S
250BK L 137.32 (5-) A
250BK A 6378 AP 0.01 LT 17000 GT ?
250BK CA THIS ALPHA WAS NOT SEEN BY 1966MC02. IA<0.01 WAS LISTED BY
250BK2CA 1972BB24.
250BK G 57.06 S S
250BK G 102.84 S S
250BK L 156 2 (8+) I
250BK DL E EG=70.4 1 TO THE 86-KEV LEVEL GIVES E(LEVEL)=156 2;
250BK2DL FROM Q=6615.7 15 AND EA=6358.4 15, E(LEVEL)=155.6 22.
250BK A 6358.4 15 2.6 3 53 10
250BK CA LISTED INTENSITIES ARE 2.9 (1966MC02), 2.4 (1972BB24).
250BK G 70.4 2 (M1+E2) 2.5
250BK CG TI DEDUCED FROM INTENSITY BALANCE AT THE 155.5-KEV LEVEL, BY
250BK2CG ASSUMING THAT ANY OTHER GAMMA FEEDING THE LEVEL CAN BE NEGLECTED.
250BK3CG TI AP 3 WAS MEASURED BY 1966MC02.
250BK L 167.09 (6-) D
250BK A 6347 2 0.75 5 160 12
250BK G 69.7 1 (M1+E2) 69 24 1 AP
250BK CG TI=0.9 FROM INTENSITY BALANCE AT THE 167.09-KEV LEVEL.
250BK2CG RI=0.013 5, IF TI=0.9, CC=69 24.
250BK L 190 2 (7+) B
250BK A 6324 2 0.04 1 2350 60
250BK CA LISTED INTENSITIES ARE 0.05 (1966MC02), 0.035 (1972BB24).
250BK L 241 (9+) I
250BK DL E LEVEL ENERGY IS FROM EG=85.1 1 TO THE 156-KEV LEVEL.
250BK A 6275 AP 0.14 2 380 60
250BK CA LISTED INTENSITIES ARE 0.16 (1966MC02), AP 0.11 (1972BB24).
250BK G 85.1 1 (M1,E2) 0.14 2
250BK CG RI=0.16% 7 IS LISTED IN 1988PO05. HOWEVER, THE INTENSITY
250BK2CG BALANCE AT THE 241-KEV LEVEL, BY USING IA(6275A)=0.14 2 FEEDING THE
250BK3CG LEVEL AND CC(M1;85.1G)=13.3, CC(E2;85.1G)=44.6, SUGGESTS IG<0.01%,
250BK4CG TI=0.14 2; ANY POSSIBLE GAMMA FEEDING THE 241-KEV LEVEL IS ASSUMED
250BK5CG NEGLIGIBLE. VERY WEAK L-SUBSHELL ELECTRONS WERE OBSERVED AND TI<<1 IS
250BK6CG LISTED IN 1966MC02.
250BK L 247.9 2 (7-) D
250BK A 6266 2 0.22 2 224 22
250BK G 80.8 1 (M1,E2) 0.1
250BK CG TI DEDUCED FROM INTENSITY BALANCE AT THE 247.9 LEVEL.
250BK2CG TI<1 WAS LISTED BY 1966MC02.
250BK G 150 2 0.020 3 [E2] 3.47
250BKS G KC= 0.1637 $ LC=2.372 $ MC=0.672 $ NC+=0.263 $
250BK L 258 AP ?
250BK A 6258 ?
250BK CA THIS ALPHA WAS NOT OBSERVED BY 1966MC02. IA<0.02 WAS
250BK2CA LISTED BY 1972BB24.
250BK L 325 2
250BK DL E 323 2 FROM QA AND EA; 327 2 FROM 249G TO 78.33 LEVEL.
250BK A 6194 2 0.04 2 515 AP
250BK G 233 2 0.008 1 ?
250BK CG EXISTENCE OF THIS GAMMA IS QUESTIONABLE.
250BK G 249 2 0.025 4
250BK L 333 2
250BK A 6184 2 0.06 AP 320 AP
250BK CA LISTED INTENSITIES: AP 0.05 (1966MC02), AP 0.08 (1972BB24).
250BK L 341 AP
250BK A 6177 0.02 AP 860 AP
250BK CA THIS ALPHA WAS NOT OBSERVED BY 1966MC02.
250BK L 413 3 M
250BK A 6105 2 0.34 2 22 2
250BK CA LISTED INTENSITIES: 0.33 (1966MC02), 0.36 (1972BB24).
250BK G 316 2 0.15 2
250BK CG RI(316G)=0.08% 4 IS GIVEN IN 1988PO05.
250BK L 471 2 M
250BK A 6048 5 0.16 23
250BK CA THIS ALPHA WAS NOT LISTED BY 1972BB24. EA AND IA ARE
250BK2CA MEASUREMENTS OF 1966MC02. THE ORIGINAL EA IS DECREASED HERE BY 8 KEV
250BK3CA BECAUSE OF A CHANGE IN CALIBRATION ENERGY.
250BK G 304 2 0.07 1
250BK CG RI(304G)=0.08% 4 IS GIVEN IN 1988PO05.
250BK L 527 20 M
250BK A 6000 20 0.03 AP 65 AP
250BK CA THIS ALPHA WAS NOT LISTED BY 1972BB24. EA AND IA WERE
250BK2CA MEASURED BY 1966MC02 IN COINCIDENCE WITH EG>275 KEV.