ADOPTED LEVELS, GAMMAS for 50Fe
Authors: Jun Chen and Balraj Singh | Citation: Nucl. Data Sheets 157, 1 (2019) | Cutoff date: 15-Apr-2019
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-16895 keV 73 | S(n)= 17797 keV 26 | S(p)= 4145 keV 9 | Q(α)= -7430 keV 14 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 50Co ε decay (38.8 MS) | B | 51Ni εp decay (23.8 MS) |
| C | 28Si(28Si,α2nγ) | D | 54Fe(α,8He) |
| E | PB(50Fe,50Fe’γ) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | ABCDE | 0+ | 152.0 ms 6 % ε = 100 % εp ≈ 0 | |||||
| 764.9 3 | ABCDE | 2+ | 7.7 ps 17 | 764.9 3 | 100 | [E2] | 0.0 | 0+ |
| 1851.5 5 | ABC | (4+) | 1086.6 3 | 100 | 764.9 | 2+ | ||
| 3159.3 7 | A C | (6+) | 1307.8 5 | 100 | 1851.5 | (4+) | ||
| 3397.2 9 | B | (4+) | 1545.7 7 | 100 | 1851.5 | (4+) | ||
| 4786.4 12 | C | (8+) | 1627 | | 3159.3 | (6+) | ||
| 6367.4 16 | C | (10+) | 1581 | | 4786.4 | (8+) | ||
| 6994.4 19 | C | (11+) | 627 | | 6367.4 | (10+) | ||
| 8458 15 | A | (6+) | % p = 100 | |||||
E(level): From Eγ data, assuming ΔE(γ)=1 keV when not stated.
Jπ(level): From analogy to the mirror nucleus 50Cr for the yrast states up to spin 11+ (2001Le31), unless otherwise stated.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - Yrast sequence | |||||||
| 0.0 | 0+ | 152.0 ms 6 % ε = 100 % εp ≈ 0 | |||||
| 764.9 3 | 2+ | 7.7 ps 17 | 764.9 3 | 100 | [E2] | 0.0 | 0+ |
| 1851.5 5 | (4+) | 1086.6 3 | 100 | 764.9 | 2+ | ||
| 3159.3 7 | (6+) | 1307.8 5 | 100 | 1851.5 | (4+) | ||
| 4786.4 12 | (8+) | 1627 | | 3159.3 | (6+) | ||
| 6367.4 16 | (10+) | 1581 | | 4786.4 | (8+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Additional Data |
| 764.9 | 2+ | 7.7 ps 17 | 764.9 3 | [E2] | B(E2)(W.u.)=26 6 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0+ | 152.0 ms 6 % ε = 100 % εp ≈ 0 | Tz=-1. E(level): Yrast sequence. |
| 764.9 | 2+ | 7.7 ps 17 | XREF: d(810). E(level): Yrast sequence. |
| 1851.5 | (4+) | E(level): Yrast sequence. | |
| 3159.3 | (6+) | E(level): Yrast sequence. | |
| 4786.4 | (8+) | E(level): Yrast sequence. | |
| 6367.4 | (10+) | E(level): Yrast sequence. |
| E(level) | E(gamma) | Comments |
| 764.9 | 764.9 | E(γ): weighted average of 764.8 3 from 50Co ε decay (38.8 ms) and 765.3 6 from 51Ni εp decay (23.8 ms). Other: 767 7 from (50Fe,50Fe’γ) |
| 1851.5 | 1086.6 | E(γ): from 51Ni εp decay. Other: 1086.6 7 from 50Co ε decay |
| 3159.3 | 1307.8 | E(γ): from 50Co ε decay |
| 3397.2 | 1545.7 | E(γ): from 51Ni εp decay |
| 4786.4 | 1627 | E(γ): From (28Si,α2nγ) only |
| 6367.4 | 1581 | E(γ): From (28Si,α2nγ) only |
| 6994.4 | 627 | E(γ): From (28Si,α2nγ) only |
Mass measurement: 2018Zh29 (mass excess=-34477 6, also 2017Zh12)
Other measurements:
1977Tr05: identification of 50Fe: 54Fe(α,8He),E=110 MeV; measured particle spectra; deduced mass excess of 50Fe
1994Bl10, 2002Pf03: production and identification of 50Fe isotope 9Be(58Ni,X) at 650 MeV/nucleon, GSI facility.
1997Ko46: 50Fe decay properties investigated. 50Fe activity produced by beam: 51 MeV 12C, target: natural Ca 1.6 mg/cm2 at Chalk River TASCC facility. Beta rays detected by plastic counters, gamma rays by HPGe 40%, beta-gamma coincidences observed. First measurement of isotopic half-life.
2015Mo01: 50Fe ions were produced from fragmentation of 680 MeV/nucleon 58Ni beam with 400 mg/cm2 9Be target using SIS-18 synchrotron at GSI facility. Reaction fragments were separated in-flight using the fragment separator FRS. The identification of nuclei was achieved by measurement of magnetic rigidity and velocity of fragments from time-of-flight method. Separated ions were implanted in one of six double-sided silicon strip detectors (DSSSDs). The β-decay signals were detected in the same DSSSD. Surrounding the implantation setup was the RISING array of 15 Euroball cluster detectors for γ detection. Measured half-life of 50Fe decay
2017Ku12: 50Fe isotope produced in the fragmentation of 79 MeV/nucleon 64Zn29+ beam with Ni target of 236 mg/cm2 thickness. Fragments were selected with the LISE3 separator at GANIL and identified by time-of-flight and energy loss using silicon ΔE detector and implanted into a double-sided silicon strip detector (DSSSD). The implanted ions and charged-particle decays were detected by the DSSSD, which was surrounded by four HPGe clover detectors (three EXOGAM clovers and a smaller Euroball clover) for γ-ray detection. Half-life of 50Fe decay was measured by (50Fe implants)β time-correlated decay events. Total number of 50Fe implanted ions=1.35×104
Theory references: consult the NSR database (www.nndc.bnl.gov/nsr/) for 33 primary references dealing with various aspects of nuclear structure
Q-value: Q(β-) deduced using mass excess=-17585 41 for 50Co from IMME analysis (2007Do17). Other: Q(β-)=-16850 400 (syst, 2017Wa10).
Q-value: Q(εp)=3568 9, S(2n)=32620 400 (syst), S(2p)=6232 11 (2017Wa10).