ADOPTED LEVELS, GAMMAS for 44V
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-)=-10382 keV 50 | S(n)= 13952 keV 40 | S(p)= 1787 keV 8 | Q(α)= -5702 keV 8 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| References: | |||
| A | 44Cr ε decay (42.8 MS) | B | 10B(36Ar,2nγ) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | Final Levels | |
| 0.0 | AB | (2)+ | 111 ms 7 % ε = 100 % εα = ? | ||||
| 196.82 10 | B | (1-) | 196.8 1 | 100 | 0.0 | (2)+ | |
| 268 10 | B | (6)+ | 150 ms 3 % ε = 100 | ||||
| 332.0 4 | B | (4+) | 332.2 4 | 100 | 0.0 | (2)+ | |
| 368.85 14 | B | (2-) | 172.0 1 369? | 100.0 33 <20.0 | 196.82 0.0 | (1-) (2)+ | |
| 564.75 27 | B | (3-) | 194.8 4 368.3 4 | 100 10 55 5 | 368.85 196.82 | (2-) (1-) | |
| 667.5 8 | B | (3-) | 298.6 8 | 100 | 368.85 | (2-) | |
| 676.91 30 | A | (1+) | 676.9 3 | 100 | 0.0 | (2)+ | |
| 773.35 29 | B | (4-) | 208.4 2 405.4 5 442.2 8 | 100 10 70 10 50 10 | 564.75 368.85 332.0 | (3-) (2-) (4+) | |
| 985 9 | B | (7+) | 713.7 5 | 100 | 268 | (6)+ | |
| 1066.4 13 | B | (5+) | 734.4 12 | 100 | 332.0 | (4+) | |
| 1124.5 7 | B | (4-) | 351.1 9 560.1 9 754.3 20 | 75 25 100 25 50 25 | 773.35 564.75 368.85 | (4-) (3-) (2-) | |
| 1343.8 10 | B | (5-) | 570.2 16 779.1 12 | 100 50 50 50 | 773.35 564.75 | (4-) (3-) | |
| 2665 9 | B | (9+) | 1680.0 16 | 100 | 985 | (7+) | |
| 3015 29 | A | (1+) | |||||
| 3166 17 | A | (1+) | |||||
| 3497 9 | B | (11+) | 832.0 7 | 100 | 2665 | (9+) | |
| 3640 18 | A | (1+) | |||||
| 3833 18 | A | (1+) | |||||
| 4030 9 | B | (10+) | 533.0 7 | 100 | 3497 | (11+) | |
E(level): From a least-squares fit to γ-ray energies, unless otherwise noted.
Jπ(level): From 2011Ta33 in (36Ar,2nγ) for excited states, based on mirror symmetry with levels in 44Sc, unless otherwise noted.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | Final Levels | ||
| Band 1 - γ sequence based on (6)+ | |||||||
| 268 10 | (6)+ | 150 ms 3 % ε = 100 | |||||
| 985 9 | (7+) | 713.7 5 | 100 | 268 | (6)+ | ||
| 2665 9 | (9+) | ||||||
| 3497 9 | (11+) | 832.0 7 | 100 | 2665 | (9+) | ||
| 4030 9 | (10+) | 533.0 7 | 100 | 3497 | (11+) | ||
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (2)+ | 111 ms 7 % ε = 100 % εα = ? | Measured mass excess=-23800.4 71 (2022Wa39), -23804.9 keV 80 (2020Pu02), -23827 keV 20 (2018Zh29). E(level): Measured mass excess=-23800.4 71 (2022Wa39), -23804.9 keV 80 (2020Pu02), -23827 keV 20 (2018Zh29). |
| 3015 | (1+) | E(level): From 44Cr ε decay. Levels are proposed by 2020Fu05 based on re-analysis of β-delayed proton data reported in 2014Po05 and 2007Do17. | |
| 3166 | (1+) | E(level): From 44Cr ε decay. Levels are proposed by 2020Fu05 based on re-analysis of β-delayed proton data reported in 2014Po05 and 2007Do17. | |
| 3640 | (1+) | E(level): From 44Cr ε decay. Levels are proposed by 2020Fu05 based on re-analysis of β-delayed proton data reported in 2014Po05 and 2007Do17. | |
| 3833 | (1+) | E(level): From 44Cr ε decay. Levels are proposed by 2020Fu05 based on re-analysis of β-delayed proton data reported in 2014Po05 and 2007Do17. |
44V first identified in 40Ca(6Li,2n) reaction (1971Ce02). Also produced in Ni(58Ni,X) E=69 MeV/nucleon (1994Ke07) and in 40Ca(6Li,2n) E=35 MeV (1997Ha04) followed by mass separation.
Mass measurement: 2020Pu02, 2019Su25, 2018Zh29, 2004St05
Other measurements:
2019Su25: 9Be(58Ni,X), E=160 MeV/nucleon, measured frequencies, time-of-flight. Deduced isomer to ground state ratio of 1.4 2.
1994Bl10: 9Be(58Ni,X), measured fragment production cross section
1994Ke07: 9Be(58Ni,X), E=69 MeV/nucleon, measured βγ-coin; deduced isomer to ground state production ratio.
2018Zh29: 44V obtained from 58Ni19+ primary beam which was accelerated to 467.91 MeV/nucleon by the heavy-ion synchrotron CSRm, and fragmented on a 15 mm thick Be target, followed by separation of fragments by RIBLL2 in-flight separator at HIRFL-Lanzhou facility. Measured precise mass excesses of 44V g.s. and isomer by isochronous mass spectrometry method. Authors compared mass excesses with systematic values in AME2012 and AME2016
2020Pu02: E=160 MeV/nucleon 58Ni beam was from the Couple Cyclotron Facility at NSCL, MSU. Fragments were separated by A1900 and then transported to Low Energy Beam and Ion Trap (LEBIT) station. Measured precise mass excesses of 44V g.s. and isomer using time-of-flight ion cyclotron resonance (tof-ICR) technique. 2020Pu02 derive a proton separation energy of 1773 keV 10 for 44V.
2022Wa39: mass measurement using isochronous mass spectrometry at the storage ring CSRe in Lanzhou.
2012Ha31: theory: calculated level spacings for positive parity states, B(M1) vs E, deformation using interacting shell model
Theoretical calculations: 13 references for nuclear structure and two 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
Levels: From Ep(c.m.)=759 26 (2014Po05) to 313 1 level in 43Ti, 2020Fu05 tentatively proposed a level at 2853 28 as the t=2, 0+ IAS of 44Cr g.s. in 44V, which possibly decays by the 759-keV proton emission. But 2020Fu05 also proposed that the 759-keV proton more likely decays from a level at 3015 keV to the 475 10 level in 43Ti. See comment for 3015 level. However, evaluators note that intensity of 0.6% 2 of the 759-keV proton peak in 2014Po05 is too low for t=2, 0+ IAS in 44V, as it implies log ft value of 4.8 2, instead of the expected value of 3.2. For this reason, evaluators have not included this level in the decay scheme.
Q-value: S(2n)=32320 200 (syst), S(2p)=6257 7, Q(ε)=13749 7, Q(εp)=5099 8
Q-value: All values quoted above are deduced by the evaluators using newly measured mass of 44V (M.E.=-23800.4 71) by 2022Wa39 and other known masses in 2021Wa16. For S(p), newly measured mass of 43Ti (M.E.=-29302.2 42) is also used, compared to M.E.=-293116 6 in 2021Wa16.
Q-value: Values from AME2020 (2021Wa16) using M.E.(44V)=-23808 7: Q(β-)=-10390 50, S(n)=13960 40, S(p)=1781 9, Qα=-5710 8, S(2n)=32330 200 (syst), S(2p)=6265 7, Q(ε)=13741 7, Q(εp)=5091 8.