ADOPTED LEVELS, GAMMAS for 44Ar
Authors: Jun Chen and Balraj Singh | Citation: Nucl. Data Sheets 190, 1 (2023) | Cutoff date: 20-Jun-2023
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=3108.2 keV 16 | S(n)= 8735 keV 6 | S(p)= 15800 keV 60 | Q(α)= -12260 keV 4 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 44Cl β- decay (0.54 S) | B | 45Cl β-n decay |
| C | 48Ca(3He,7Be) | D | 48Ca(48Ca,44ArG) |
| E | 208Pb(48Ca,xγ) | F | C(46K,pnγ) |
| G | Coulomb Excitation | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | ABCDEFG | 0+ | 11.87 m 5 % β- = 100 | |||||
| 750 30 ? | C | (0+) | ||||||
| 1158.14 11 | AB DEFG | 2+ | 3.80 ps +49-33 | 1158.11 12 | 100 | E2 | 0.0 | 0+ |
| 1610 30 | C | (2+) | ||||||
| 1.78E3 8 ? | F | 1780 80 ? | | 0.0 | 0+ | |||
| 2010.93 14 | AB G | (2+) | 1.53 ps +20-17 | 852.77 10 2010.18 18 | 100.0 21 68.8 21 | [M1,E2] [E2] | 1158.14 0.0 | 2+ 0+ |
| 2746.37 30 | A DEF | (4+) | 2.7 ps +25-20 | 1588.1 3 2747.0 8 ? | 100 8 47 8 | [E2] [E4] | 1158.14 0.0 | 2+ 0+ |
| 2976.25 17 | A | 965.32 12 1817.7 3 | 100 7 47 5 | 2010.93 1158.14 | (2+) 2+ | |||
| 3439.4 11 | CDE | (6+) | > 27.7 ps | 693 | 100 | [E2] | 2746.37 | (4+) |
| 3980 50 | C | |||||||
| 4430 40 | C | |||||||
| 4807.68 28 | A | 2796.0 4 3649.8 4808.0 | 100 | 2010.93 1158.14 0.0 | (2+) 2+ 0+ | |||
| 5352.22 29 | A | 2375.6 3 3338.4 15 4195.0 | 100 6 41 8 | 2976.25 2010.93 1158.14 | (2+) 2+ | |||
E(level): From a least-squares to Eγ data for levels populated in γ-ray studies. Others are from reaction studies. Where ΔEγ is not available, it is assumed to be 0.5 keV for Eγ quoted to nearest tenth keV and 1.0 keV for Eγ quoted to nearest keV. In the fitting procedure, Δ|Eγ for 2010.18γ has been increased to 0.5 keV from 0.18 keV to decrease the reduced χ2 to 2.68 from 3.92
Jπ(level): Predicted from Shell Model calculations (1999Wa21,2000Fo03,1976Cr03) and systematics of even-even nuclei, unless otherwise noted.
T1/2(level): From the differential recoil distance Doppler shift (RDDS) method in 208Pb(48Ca,Xγ), unless otherwise noted
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Additional Data |
| 1158.14 | 2+ | 3.80 ps +49-33 | 1158.11 12 | E2 | B(E2)(W.u.)=7.8 +7-9 |
| 2010.93 | (2+) | 1.53 ps +20-17 | 2010.18 18 | [E2] | B(E2)(W.u.)=0.50 6 |
| 2746.37 | (4+) | 2.7 ps +25-20 | 1588.1 3 | [E2] | B(E2)(W.u.)=1.5 +20-8 |
| 3439.4 | (6+) | > 27.7 ps | 693 | [E2] | B(E2)(W.u.)<14 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0+ | 11.87 m 5 % β- = 100 | Measured rms charge radius (<r2>)1/2=3.4454 fm 22 from δ<r2>(44Ar-38Ar)=+0.289 fm2 9(stat) 81(syst) (2008Bl01, laser spectroscopy). E(level): Measured rms charge radius (<r2>)1/2=3.4454 fm 22 from δ<r2>(44Ar-38Ar)=+0.289 fm2 9(stat) 81(syst) (2008Bl01, laser spectroscopy). |
| 1158.14 | 2+ | 3.80 ps +49-33 | Q=-0.083 30 (2009Zi01), B(E2)=0.0360 +34-41 XREF: F(1110). |
| 2746.37 | (4+) | 2.7 ps +25-20 | XREF: F(2610). |
| 3439.4 | (6+) | > 27.7 ps | XREF: C(3480). |
| E(level) | E(gamma) | Comments |
| 1158.14 | 1158.11 | E(γ): other: 1110 80 from (46K,pnγ) |
| 1.78E3 | 1780 | E(γ): From C(46K,pnγ) |
| 2010.93 | 2010.18 | E(γ): other: 2010.6 from 45Cl β-n decay with Iγ=60 |
| 2746.37 | 1588.1 | E(γ): other: 1500 80 from (46K,pnγ) |
Other measurements:
T1/2 of 44Ar: 1970Hu11, 1969La16
1971Ar32: 232Th(40Ar,X), E=290 MeV, measured fragments isotopic yields.
1997Li15: reaction cross sections and radii for f-p shell nuclei
1999Ai02: 44Ar beam from 55Mn fragmentation, Si(44Ar,X) studied.
2001Sc01: 1H(44Ar,44Ar’) E=33.0 MeV and 44Ar(p,p’) E=33.2 MeV, measured cross section, deduced B(E2)
2001Vo09: 48Ca(p,pα), populated ground state of daughter nucleus
2004De41: natCu(7Li,X), E=35 MeV, measured cross-section
2006Ro34: 2H(48Ca,X), measured production cross-section
Mass measurement: 2003Bl17
Theoretical structure calculations:
2021Pe14: calculated potential energy curves as function of deformation parameter β2 using constrained axial RHB method.
2021Su18: calculated potential energy surfaces, occupation numbers for ground state in (β,γ) plane, energies, spins, B(E2) and quadrupole moments of low-lying positive-parity levels using antisymmetrized molecular dynamics (AMD) with Gogny D1S density functional.
2013Wa05: calculated single-particle levels, Jπ occupational probabilities, proton density distributions using Skyrme-Hartree-Fock approach
2011Ka03: calculated energy, B(E2) and quadrupole moment of first 2+ state using shell model with the extended pairing plus quadrupole-quadrupole forces
2009Ro08: theory: calculated levels, Jπ, g factors, B(E2), configurations using shell model with WBT and SDPF-U interactions.
1997Re04: calculated 2+ levels using shell model.
Other theoretical calculations: 26 references for structure and one for radioactive decays retrieved from the NSR database (www.nndc.bnl.gov/nsr/) are listed in document records which can be accessed via web-based ENSDF database
Q-value: S(2n)=14393 6, S(2p)=29613 3 (2021Wa16)