ADOPTED LEVELS, GAMMAS for 187Ta
Author: Balraj Singh | Citation: ENSDF | Cutoff date: 31-Mar-2022
Author: M. S. Basunia | Citation: Nucl. Data Sheets 110, 999 (2009) | Cutoff date: 1-Nov-2008
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=3010 keV 60 | S(n)= 6360 keV 80 | S(p)= 7760 keV 80 | Q(α)= 40×101 keV 10 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 187Ta IT decay (7.3 S) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | M(γ) | Final Levels | |
| 0.0 | A | (7/2+) | 283 s 10 % β- = 100 | ||||
| 154.8 4 | A | (9/2+) | 154.8 5 | 0.0 | (7/2+) | ||
| 245.2 4 | A | (9/2-) | 90.4 5 245.2 5 | 154.8 0.0 | (9/2+) (7/2+) | ||
| 403.8 5 | A | (11/2-) | 158.6 5 249.0 5 | 245.2 154.8 | (9/2-) (9/2+) | ||
| 595.5 7 | A | (13/2-) | 191.7 5 350? | 403.8 245.2 | (11/2-) (9/2-) | ||
| 802.1 7 | A | (15/2-) | 206.6 5 398.3 5 | 595.5 403.8 | (13/2-) (11/2-) | ||
| 1053.8 7 | A | (17/2-) | 251.7 5 458.3 5 | 802.1 595.5 | (15/2-) (13/2-) | ||
| 1287.0 8 | A | (19/2-) | 233.2 5 484.9 5 | 1053.8 802.1 | (17/2-) (15/2-) | ||
| 1586.4 8 | A | (21/2-) | 299.4 5 532.6 5 | 1287.0 1053.8 | (19/2-) (17/2-) | ||
| 1778.1 10 | A | (25/2-) | 7.3 s 9 % IT > 60 % β- < 40 | 191.7 5 | (E2) | 1586.4 | (21/2-) |
| 2933 14 | (41/2+) | > 5 m % IT = ? % β- = ? | |||||
Jπ(level): Levels above 155 keV are assigned members of band based on π9/2[514] configuration, consistent with model calculations (2020Wa29)
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | M(γ) | Final Levels | ||
| Band 1 - π9/2[514],α=+1/2. | |||||||
| 245.2 4 | (9/2-) | ||||||
| 595.5 7 | (13/2-) | 191.7 5 350? | 403.8 245.2 | (11/2-) (9/2-) | |||
| 1053.8 7 | (17/2-) | 251.7 5 458.3 5 | 802.1 595.5 | (15/2-) (13/2-) | |||
| 1586.4 8 | (21/2-) | 299.4 5 532.6 5 | 1287.0 1053.8 | (19/2-) (17/2-) | |||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | M(γ) | Final Levels | ||
| Band 2 - π9/2[514],α=-1/2. | |||||||
| 403.8 5 | (11/2-) | ||||||
| 802.1 7 | (15/2-) | 206.6 5 398.3 5 | 595.5 403.8 | (13/2-) (11/2-) | |||
| 1287.0 8 | (19/2-) | 233.2 5 484.9 5 | 1053.8 802.1 | (17/2-) (15/2-) | |||
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (7/2+) | 283 s 10 % β- = 100 | Number of ions detected=102 (2010Re07,2012Re19). |
| 245.2 | (9/2-) | E(level): π9/2[514],α=+1/2. | |
| 403.8 | (11/2-) | E(level): π9/2[514],α=-1/2. | |
| 595.5 | (13/2-) | E(level): π9/2[514],α=+1/2. | |
| 802.1 | (15/2-) | E(level): π9/2[514],α=-1/2. | |
| 1053.8 | (17/2-) | E(level): π9/2[514],α=+1/2. | |
| 1287.0 | (19/2-) | E(level): π9/2[514],α=-1/2. | |
| 1586.4 | (21/2-) | E(level): π9/2[514],α=+1/2. | |
| 1778.1 | (25/2-) | 7.3 s 9 % IT > 60 % β- < 40 | Number of ions detected=17 (2010Re07,2012Re19). |
| 2933 | (41/2+) | > 5 m % IT = ? % β- = ? | Number of ions detected=9 (2010Re07,2012Re19). |
| E(level) | E(gamma) | Comments |
| 595.5 | 191.7 | E(γ): Multiply placed. Doublet with intensities separately determined (2020Wa29), but intensity values are not given by authors |
| 1778.1 | 191.7 | E(γ): Multiply placed. Doublet with intensities separately determined (2020Wa29), but intensity values are not given by authors M(γ): tentatively assigned by 2020Wa29 in 187Ta IT decay from α(K)exp |
1999Be63: 187Ta produced and identified in 9Be(197Au,X), E(197Au)=950 MeV/nucleon pulsed beam at the SIS synchrotron of GSI. Fragments of interest separated by Bπ-tof-ΔE method using FRS fragment separator, two position-sensitive scintillation detectors, time-of-flight, and multi-sampling ionization chambers (MUSICs). Measured production cross section.
2010Re07, 2012Re19 (also 2012ReZZ thesis, 2011St21, 2000PoZY): Schottky mass spectrometry technique used to measure masses and identify high-spin isomers. 187Ta g.s. and isomers were produced in 9Be(197Au,X),E(197Au=478-492 MeV/nucleon and 9Be(208Pb,X),E=1 GeV/nucleon reactions at the UNILAC-SIS facility of GSI. Target=9Be 1035 mg/cm2 with a 221 mg/cm2 niobium backing. Mostly bare atoms of highly-charged reaction products were separated with FRS and injected into the storage ring ESR. The ions were stochastically and electron cooled. Deduced masses from Schottky spectra; and identified high-spin isomers, with 187Ta in 73+ charge state, i.e. bare ion.
2013Sh30: measured masses by Schottky mass spectrometry (SMS) technique using FRS-ESR facility at GSI.
Q-value: S(2n)=11640 60, S(2p)=17510 310 (syst) (2021Wa16)