ADOPTED LEVELS, GAMMAS for 61Cr
Author: Balraj Singh | Citation: ENSDF | Cutoff date: 25-Mar-2019
Authors: Kazimierz Zuber, Balraj Singh | Citation: Nucl. Data Sheets 125, 1 (2015) | Cutoff date: 25-Jan-2015
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=9245.6 keV 29 | S(n)= 3659.3 keV 21 | S(p)= 1655×101 keV 22 | Q(α)= -1100×101 keV 26 | ||
| Reference: 2018MO14,2017WA10 |
| References: | |||
| A | 61V β- decay (48.3 MS) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | A | (5/2-) | 234 ms 11 % β- = 100 % β-n = ? | |||||
| 70.8 3 | A | (3/2,5/2,7/2) | 70.8 3 | 100 | D | 0.0 | (5/2-) | |
| 97.41 23 | A | (3/2,5/2,7/2) | 97.7 3 | 100 | D,M1+E2 | 0.0 | (5/2-) | |
| 224.1 4 | A | 126.7 3 | 100 | 97.41 | (3/2,5/2,7/2) | |||
| 401.8 5 | A | 331.0 4 | 100 | 70.8 | (3/2,5/2,7/2) | |||
| 450.6 3 | A | 353.6 5 450.5 3 | 27 9 100 11 | 97.41 0.0 | (3/2,5/2,7/2) (5/2-) | |||
| 564.4 5 | A | 467.0 4 | 100 | 97.41 | (3/2,5/2,7/2) | |||
| 631.7 8 | A | 407.6 7 | 100 | 224.1 | ||||
| 715.9 4 | A | 645.0 8 715.9 4 | 20 8 100 12 | 70.8 0.0 | (3/2,5/2,7/2) (5/2-) | |||
| 773.7 4 | A | 676.4 6 773.7 4 | 39 17 100 22 | 97.41 0.0 | (3/2,5/2,7/2) (5/2-) | |||
| 1026.6 3 | A | 929.4 4 1026.3 4 | 79 11 100 13 | 97.41 0.0 | (3/2,5/2,7/2) (5/2-) | |||
| 1222.0 5 | A | 1151.2 4 | 100 | 70.8 | (3/2,5/2,7/2) | |||
| 2061.9 5 | A | 1964.5 4 | 100 | 97.41 | (3/2,5/2,7/2) | |||
| 2261.4 6 | A | 2164.0 5 | 100 | 97.41 | (3/2,5/2,7/2) | |||
E(level): From least-squares fit to Eγ data
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 70.8 | (3/2,5/2,7/2) | 70.8 3 | D | 0.083 | α=0.083 18 | |
| 97.41 | (3/2,5/2,7/2) | 97.7 3 | D,M1+E2 | 0.24 | α=0.24 21 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (5/2-) | 234 ms 11 % β- = 100 % β-n = ? | Theoretical T1/2=365 ms, %β-n=0.2 (2016Ma12). |
| E(level) | E(gamma) | Comments |
| 70.8 | 70.8 | M(γ): from Weisskopf estimates and non-observation of a long lifetime for 71-keV level (2014Su07) |
| 97.41 | 97.7 | M(γ): from Weisskopf estimates, and observation of no time delay between the 127- and 98-keV γ rays within the experimental detection limit of ≈150 ns (2014Su07) |
1985Gu14: first identification of 61Cr from fragmentation of 86Kr beam at 33 MeV/nucleon on tantalum and titanium targets using time-of-flight and ΔE-E measurements, LISE spectrometer at GANIL facility
1992We04: 61Cr formed in fragmentation of a 500 MeV/nucleon 86Kr beam incident on a Be target and identified by a zero-degree magnetic spectrometer and separated by FRS at GSI facility. Determined production cross section.
1998Am04: 61Cr formed in fragmentation of 500 MeV/nucleon 86Kr beam incident on Be target, FRS spectrometer at GSI facility. Measured half-life of 61Cr decay
1999So20 (also 2001So07 and 1999Le67): 61Cr produced in the fragmentation of 60.4 MeV/nucleon 86Kr beam with 58Ni target; LISE3 spectrometer at GANIL facility. Measured half-life of decay of 61Cr
2002MaZN (thesis): 61Cr produced in fragmentation of 57.8 MeV/nucleon 86Kr beam with tantalum target using LISE-2000 spectrometer at GANIL facility. Measured half-life of 61Cr decay.
2009Cr02: 61Cr produced in 9Be(76Ge,X) reaction at a beam energy of 130 MeV/nucleon. The 76Ge beam was produced by the coupled cyclotrons at the National Superconducting Cyclotron Laboratory at Michigan State University. Fragments were separated using the A1900 fragment separator. The β and γ spectra were measured using the Beta Counting System and the Segmented Germanium Array, as well as three Si PIN detectors. Measured Eγ, Iγ, γγ, β, βγ coin, (fragment)β coin, half-life of the 61Cr ground state.
Mass measurements: 2018Mo14, 2016Me07, 2015Xu14, 1994Se12, 1990Tu01.
2014Su07: shell-model calculations using GXPF1A and KB3G interactions. Predicted levels from GXPF1A calculation are: 0,1/2-; 35,5/2-; 139,3/2-; 575,3/2-; 895,5/2-; 1107,9/2-; 1115,7/2-; 1197,7/2-. Except for possible matching of 35, 5/2- level with ground state, none of the other levels can be easily matched with those deduced from experimental data in 2014Su07
1995Ri05: Shell model calculations; predicted binding energy, and mass defect
Theory references: consult the NSR database (www.nndc.bnl.gov/nsr/) for six references for structure calculations.
Levels: No evidence was found for isomeric states in 61Cr based on γγ-coin data in 61V decay study (2014Su07)
Q-value: Q(β-n)=2400.1 29, S(2n)=10523.2 19, S(2p)=31565 200 (syst) (2018Mo14,2017Wa10)
Q-value: Q values and separation energies deduced by evaluator from measured mass excesses by 2018Mo14 for Cr isotopes, and mass excesses for other nuclei from 2017Wa10
Q-value: Mass excess(61Cr)=-42496.5 keV 18 and -42503 keV 20 (2018Mo14), as compared to -42480 keV 100 in 2017Wa10 evaluation.