ADOPTED LEVELS, GAMMAS for 44K
Authors: Jun Chen, Balraj Singh and John A. Cameron | Citation: Nucl. Data Sheets 112, 2357 (2011) | Cutoff date: 31-Jul-2011
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=5687.2 keV 6 | S(n)= 7277.4 keV 6 | S(p)= 11061 keV 6 | Q(α)= -1.065×104 keV 4 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 44Ar β- decay (11.87 M) | B | 44Ca(t,3He) |
| C | 48Ca(p,αnγ) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | Final Levels | |
| 0.0 | ABC | 2- | 22.13 m 19 % β- = 100 | ||||
| 182.71 6 | AB | (1,2,3+) | < 0.9 ns | 182.6 1 | 100 | 0.0 | 2- |
| 382.78 7 | ABC | < 0.7 ns | 382.73 9 | 100 | 0.0 | 2- | |
| 520.02 7 | ABC | < 0.7 ns | 137.25 5 520.0 1 | 100.0 7 43.3 7 | 382.78 0.0 | 2- | |
| 811.62 12 | BC | 291.6 1 | 100 | 520.02 | |||
| 968.9 3 | BC | 586.1 3 | 100 | 382.78 | |||
| 1013.51 12 | BC | 202.7 10 ? 630.7 1 | <10 100 | 811.62 382.78 | |||
| 1051.38 8 | AB | 531.2 3 1051.3 1 | 3.2 6 100.0 6 | 520.02 0.0 | 2- | ||
| 1076.83 7 | AB | 693.8 2 894.2 1 1076.6 1 | 25 4 67 6 100 6 | 382.78 182.71 0.0 | (1,2,3+) 2- | ||
| 1240.96 16 | C | 227.40 15 721.2 4 | 100 43 | 1013.51 520.02 | |||
| 1367.87 18 | C | < 0.7 ns | 126.9 1 556.3 3 | 100 18 | 1240.96 811.62 | ||
| 1459.56 6 | A | (0-,1) | 408.1 1 1276.6 1 1460.0 1 | 100 4 38 3 53 4 | 1051.38 182.71 0.0 | (1,2,3+) 2- | |
| 1480 10 | B | ||||||
| 1500 15 | B | ||||||
| 1886.12 7 | A | 1+ | 426.7 1 809.1 1 1703.4 1 1886.1 1 | 4.6 2 3.4 3 100 3 55.7 18 | 1459.56 1076.83 182.71 0.0 | (0-,1) (1,2,3+) 2- | |
| 1990 20 | B | ||||||
| 2060 20 | B | ||||||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | Final Levels | |
| 2325.94 18 | A | 1+ | 866.1 10 2143.5 4 2325.8 2 | 100 6 49 3 51 3 | 1459.56 182.71 0.0 | (0-,1) (1,2,3+) 2- | |
| 2574.28 12 | A | 1+ | 1114.7 1 | 100 | 1459.56 | (0-,1) | |
E(level): From least-squares fit to Eγ’s
T1/2(level): γγ(t) for excited states
E(γ): From β- decay and (α,pnγ). Weighted average taken when available, unless otherwise noted.
I(γ): From β- decay.
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 2- | 22.13 m 19 % β- = 100 | μ=-0.856 4 (1982To02,1982Du06,1989Ra17,2005St24) The rms charge radius (<r2>)1/2=3.456 fm 10 (2004An14 evaluation, same value in 2008 update). |
| 182.71 | (1,2,3+) | < 0.9 ns | Populated weakly in (t,3He). |
| 1480 | E(level): Energy from (α,pnγ), intensity from 44Ar β- decay. Level at 1480 associated with the 1459.5 level, and the level at 1500 lowered by 20 keV by 1990En08. | ||
| 1500 | E(level): Energy from (α,pnγ), intensity from 44Ar β- decay. Level at 1480 associated with the 1459.5 level, and the level at 1500 lowered by 20 keV by 1990En08. | ||
| 1990 | E(level): Poor fit. Level-energy difference=1459.6. Probable multiplet. | ||
| 2060 | E(level): Poor fit. Level-energy difference=1459.6. Probable multiplet. |
Other measurements:
Reaction cross sections and radii for f-p shell nuclei: 1997Li15
Giant resonances: 1988Vo06
Isotope shifts and hyperfine structure: 1982To02, 1982Du06
1999Ai02: 44K beam from 55Mn fragmentation, Si(44K,X) studied.
44Ca(n,p): 1999Ar19, 1988Ma53, 1986Pe06, 1985Gu17, 1977Mo05, 1968Le25
Q-value: Note: Current evaluation has used the following Q record
Q-value: S(2n)=16902.09 43, S(2p)=25450 140 (2011AuZZ)
Q-value: Values in 2003Au03: Q(β-)=5660 40, S(n)=7290 40, S(p)=11090 40, Q(α)=-10680 50, S(2n)=16930 40, S(2p)=25470 150