List of levels for 215RA

Authors: S. Kumar, B. Singh, K. Rojeeta Devi, A. Rohilla | Citation: Nucl. Data Sheets 114, 2023 (2013) | Cutoff date: 23-SEP-2013

²¹⁵Ra evaluated by S. Kumar, B. Singh, K. Rojeeta Devi, {βα. Rohilla

²¹⁵Ra identified (1961Gr43,1962Gr20) in excitation function measurements in ²⁰⁹Bi(¹¹B,5n)²¹⁵Ra reaction. 1968Va18 identified ²¹⁵Ra as descendent of ²¹⁹Th

2012Co22: ²⁰⁷Pb(⁶⁴Ni,X), E=5.92 MeV/nucleon; measured lifetime of rotating nuclear molecules or dinuclear system (DNS). Detected reaction products and measured their velocity distribution correlated with α particles from fragments. The ⁶⁴Ni beam from UNILAC accelerator at GSI facility, reaction products separated by SHIP velocity filter. Target=300 μg/cm² thick ²⁰⁷Pb deposited on a 40 μg/cm² thick carbon foil and covered by a layer of 10 μg/cm² carbon. Isotopes identified by their α decay characteristics. For ²¹⁵Ra, measured mean lifetime of DNS |t=2.0× 10^-20 s 3

Levels: The level structure of ²¹⁵Ra, described by a multiparticle octupole coupling mechanism, leads to configuration mixed isomers with characteristic enhanced E3 transitions. These have been explained by the coupling of octupole vibrations to the shell-model configurations presented here for the six protons and single neutron outside closed shells (1998St24).

Levels: The low-lying yrast levels in ²¹⁵Ra also have been interpreted in terms of the shell model by coupling the odd neutron to experimentally determined energies in ²¹⁴Ra (1983Lo16). The enhancement of the 773-keV E3 transition in ²¹⁵Ra is due mostly to the coupling of the particle orbital to the octupole phonon in the ²⁰⁸Pb core. Its B(E3)(W.u.)=37 2 agrees with the systematics for E3 transitions in the ²⁰⁸Pb region (1983Lo16). See also 1998St24, 1989Dr02, 1985Be05, and 1988Fu10 for further discussions on B(E3) values for this nucleus.

Gammas: All γ-ray data are from ²⁰⁶Pb(¹³C,4nγ)

Q-value: S(2n)=13967 22, S(2p)=6346 9 (2012Wa38)

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Mixing Ratio	Conversion Coefficient	Additional Data
773.0	(15/2-)	67.2 ns 14	773.0 2	E3		0.0404	B(E3)(W.u.)=38.4 8, α=0.0404, α(K)=0.0255 4, α(L)=0.01105 16, α(M)=0.00287 4, α(N)=0.000760 11, α(O)=0.0001679 24, α(P)=2.71E-5 4, α(Q)=1.145E-6 16
1625.3	(17/2+)		852.3 2	E1		0.00425	α=0.00425, α(K)=0.00350 5, α(L)=0.000572 8, α(M)=0.0001346 19, α(N)=3.53×10^-5 5, α(O)=8.00E-6 12, α(P)=1.378E-6 20, α(Q)=1.037E-7 15
1821.2	(21/2+)	25.0 ns 14	196.0 2	E2		0.629	B(E2)(W.u.)=0.48 3, α=0.629, α(K)=0.1681 24, α(L)=0.340 5, α(M)=0.0917 14, α(N)=0.0242 4, α(O)=0.00519 8, α(P)=0.000768 12, α(Q)=7.84E-6 12
1821.2	(21/2+)	25.0 ns 14	1048.2 2	E3		0.0195	B(E3)(W.u.)=2.91 17, α=0.0195, α(K)=0.01382 20, α(L)=0.00425 6, α(M)=0.001074 15, α(N)=0.000284 4, α(O)=6.33E-5 9, α(P)=1.047E-5 15, α(Q)=5.59E-7 8
1877.8	(25/2+)	7.29 µs 20	56.5 2	E2		145	B(E2)(W.u.)=0.0121 6, α=145 4, α(L)=106.3 24, α(M)=28.8 7, α(N)=7.61 17, α(O)=1.61 4, α(P)=0.231 6, α(Q)=0.000514 11
1994.5	(23/2+)		173.3 2	M1		3.27	α=3.27, α(K)=2.63 4, α(L)=0.488 7, α(M)=0.1165 17, α(N)=0.0307 5, α(O)=0.00701 10, α(P)=0.001222 18, α(Q)=9.58×10^-5 14
2053.8	(25/2+)		59.3 2	M1		14.25	α=14.25 25, α(L)=10.80 19, α(M)=2.58 5, α(N)=0.681 12, α(O)=0.155 3, α(P)=0.0271 5, α(Q)=0.00213 4
2053.8	(25/2+)		176.0 2	M1		3.13	α=3.13, α(K)=2.52 4, α(L)=0.467 7, α(M)=0.1115 16, α(N)=0.0294 5, α(O)=0.00671 10, α(P)=0.001169 17, α(Q)=9.17×10^-5 14
2214.4	(27/2-)		336.6 2	(E1)		0.0272	α=0.0272, α(K)=0.0220 3, α(L)=0.00396 6, α(M)=0.000942 14, α(N)=0.000247 4, α(O)=5.53×10^-5 8, α(P)=9.26E-6 13, α(Q)=6.12E-7 9
2246.9	(29/2-)	1.39 µs 7	32.5	[M1]		84	B(M1)(W.u.)=3.4×10^-7 5, α=84 5
	(29/2-)	1.39 µs 7	193.1 2	M2(+E3)	0.2 LT	10.99	B(E3)(W.u.)<100, B(M2)(W.u.)=0.17 1, α=10.99, α(K)=7.38 11, α(L)=2.68 4, α(M)=0.699 11, α(N)=0.187 3, α(O)=0.0422 7, α(P)=0.00709 11, α(Q)=0.000471 7
	(29/2-)	1.39 µs 7	369.1 2	M2+E3	1.07 +25-20	0.81	B(E3)(W.u.)=4.8 13, B(M2)(W.u.)=0.0011 4, α=0.81 9, α(K)=0.50 9, α(L)=0.226 5, α(M)=0.0593 10, α(N)=0.01577 25, α(O)=0.00349 7, α(P)=0.000566 16, α(Q)=2.6E-5 4
3088.8+X	(33/2+)		841.9 2	E1		0.00435	α=0.00435, α(K)=0.00358 5, α(L)=0.000586 9, α(M)=0.0001377 20, α(N)=3.61×10^-5 5, α(O)=8.19E-6 12, α(P)=1.410E-6 20, α(Q)=1.060E-7 15
3143.7+X	(35/2+)		54.9 2	M1		17.9	α=17.9 4, α(L)=13.54 24, α(M)=3.24 6, α(N)=0.854 15, α(O)=0.195 4, α(P)=0.0340 6, α(Q)=0.00267 5
3331.1+X	(37/2+)		187.4 2	M1		2.63	α=2.63, α(K)=2.11 3, α(L)=0.391 6, α(M)=0.0933 14, α(N)=0.0246 4, α(O)=0.00562 8, α(P)=0.000979 14, α(Q)=7.67×10^-5 11
3415.6+X	(37/2+)		271.9 2	M1		0.930	α=0.930, α(K)=0.748 11, α(L)=0.1376 20, α(M)=0.0328 5, α(N)=0.00866 13, α(O)=0.00198 3, α(P)=0.000345 5, α(Q)=2.70×10^-5 4
3586.4+X	(37/2+)		170.8 2	M1		3.41	α=3.41, α(K)=2.74 4, α(L)=0.508 8, α(M)=0.1214 18, α(N)=0.0320 5, α(O)=0.00730 11, α(P)=0.001273 19, α(Q)=9.98×10^-5 15
3586.4+X	(37/2+)		255.4 2	M1		1.106	α=1.106, α(K)=0.890 13, α(L)=0.1638 24, α(M)=0.0391 6, α(N)=0.01031 15, α(O)=0.00235 4, α(P)=0.000410 6, α(Q)=3.21×10^-5 5
3738.6+X	(39/2-)		152.2 2	E1		0.1740	α=0.1740, α(K)=0.1372 20, α(L)=0.0279 4, α(M)=0.00669 10, α(N)=0.00174 3, α(O)=0.000385 6, α(P)=6.20×10^-5 9, α(Q)=3.46E-6 5
	(39/2-)		323.1 2	E1		0.0298	α=0.0298, α(K)=0.0241 4, α(L)=0.00435 7, α(M)=0.001036 15, α(N)=0.000271 4, α(O)=6.07×10^-5 9, α(P)=1.016E-5 15, α(Q)=6.67E-7 10
	(39/2-)		407.4 2	E1		0.0180	α=0.0180, α(K)=0.01463 21, α(L)=0.00257 4, α(M)=0.000611 9, α(N)=0.0001600 23, α(O)=3.60×10^-5 5, α(P)=6.07E-6 9, α(Q)=4.14E-7 6
3756.6+X	(43/2-)	555 ns 10	18.0	[E2]		2.54×10⁴	B(E2)(W.u.)=0.24 7, α=2.54E4, α(L)=1.498E4 21, α(M)=7.85E3 11, α(N)=2.06E3 3, α(O)=436 7, α(P)=62.1 9, α(Q)=0.0875 13
3756.6+X	(43/2-)	555 ns 10	425.5 2	E3		0.240	B(E3)(W.u.)=37 3, α=0.240, α(K)=0.0887 13, α(L)=0.1113 16, α(M)=0.0303 5, α(N)=0.00806 12, α(O)=0.001748 25, α(P)=0.000269 4, α(Q)=5.66E-6 8
3935.4+X	(43/2-)		178.6 2	M1		3.01	α=3.01, α(K)=2.42 4, α(L)=0.448 7, α(M)=0.1070 16, α(N)=0.0282 4, α(O)=0.00644 10, α(P)=0.001122 17, α(Q)=8.79×10^-5 13
4366.8+X	(45/2+)		431.5 2	E1		0.01597	α=0.01597, α(K)=0.01298 19, α(L)=0.00227 4, α(M)=0.000538 8, α(N)=0.0001409 20, α(O)=3.17×10^-5 5, α(P)=5.36E-6 8, α(Q)=3.69E-7 6
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Mixing Ratio	Conversion Coefficient	Additional Data
4567.0+X	(49/2+)	10.47 ns 14	13.5	[E1]		5.74	B(E1)(W.u.)=0.00026 6, α=5.74, α(N)=1.107 16, α(O)=0.207 3, α(P)=0.0218 3, α(Q)=0.000516 8
	(49/2+)	10.47 ns 14	200.1 2	(E2)		0.584	B(E2)(W.u.)=0.758 23, α=0.584, α(K)=0.1616 23, α(L)=0.311 5, α(M)=0.0839 13, α(N)=0.0222 4, α(O)=0.00475 7, α(P)=0.000704 11, α(Q)=7.44E-6 11
	(49/2+)	10.47 ns 14	810.2 2	(E3)		0.0359	B(E3)(W.u.)=37.6 15, α=0.0359, α(K)=0.0232 4, α(L)=0.00945 14, α(M)=0.00244 4, α(N)=0.000647 9, α(O)=0.0001431 20, α(P)=2.32E-5 4, α(Q)=1.021E-6 15
4882.7+X	(51/2-)		196.3 2	[E2]		0.626	α=0.626, α(K)=0.1676 24, α(L)=0.337 5, α(M)=0.0911 14, α(N)=0.0241 4, α(O)=0.00515 8, α(P)=0.000763 12, α(Q)=7.81×10^-6 12
5608.7+X	(57/2+)	1.66 ns 14	236.0 2	E2		0.328	B(E2)(W.u.)=4.6 4, α=0.328, α(K)=0.1164 17, α(L)=0.1559 23, α(M)=0.0418 6, α(N)=0.01105 16, α(O)=0.00238 4, α(P)=0.000356 6, α(Q)=4.96E-6 7

Q(β-)=-3497 keV 15	S(n)= 5630 keV 9	S(p)= 3797 keV 11	Q(α)= 8864 keV 3
Reference: 2012WA38

References:
A	²¹⁵Ac ε decay (0.17 S)	B	²¹⁹Th α decay (1.05 μs)
C	²⁰⁶Pb(¹³C,4nγ)

E(level)	E(gamma)	Comments
2246.9+X	X	E(γ): no transition seen, but required for current level scheme. Estimated value of x \|< 35 keV

E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
0.0	A B C	(9/2+)	1.66 ms 2 % α = 100
773.0 2	C	(15/2-)	67.2 ns 14	773.0 2	100	E3	0.0	(9/2+)
1625.3 3	C	(17/2+)		852.3 2	100	E1	773.0	(15/2-)
1821.2 3	C	(21/2+)	25.0 ns 14	196.0 2 1048.2 2	100.0 6 48.6 4	E2 E3	1625.3 773.0	(17/2+) (15/2-)
1877.8 3	C	(25/2+)	7.29 µs 20	56.5 2	100	E2	1821.2	(21/2+)
1994.5 3	C	(23/2+)		173.3 2	100	M1	1821.2	(21/2+)
2053.8 4	C	(25/2+)		59.3 2 176.0 2	16 2 100 2	M1 M1	1994.5 1877.8	(23/2+) (25/2+)
2214.4 4	C	(27/2-)		336.6 2	100	(E1)	1877.8	(25/2+)
2246.9 4	C	(29/2-)	1.39 µs 7	32.5S 193.1 2 369.1 2	0.997 13 100.0 17 32 3	[M1] M2(+E3) M2+E3	2214.4 2053.8 1877.8	(27/2-) (25/2+) (25/2+)
2246.9+X	C	(31/2-)		X			2246.9	(29/2-)
3088.8+X 2	C	(33/2+)		841.9 2	100	E1	2246.9+X	(31/2-)
3143.7+X 3	C	(35/2+)		54.9 2	100	M1	3088.8+X	(33/2+)
3331.1+X 4	C	(37/2+)		187.4 2	100	M1	3143.7+X	(35/2+)
3413.4+X 4	C	(37/2-)		269.7 2	100	D	3143.7+X	(35/2+)
3415.6+X 4	C	(37/2+)		271.9 2	100	M1	3143.7+X	(35/2+)
3586.4+X 4	C	(37/2+)		170.8 2 255.4 2 442.6 2	19 4 100 12 10 4	M1 M1	3415.6+X 3331.1+X 3143.7+X	(37/2+) (37/2+) (35/2+)
3738.6+X 4	C	(39/2-)		152.2 2 323.1 2 325.3 2 407.4 2	46.5 5 30.7 10 4.0 10 100.0 10	E1 E1 E1	3586.4+X 3415.6+X 3413.4+X 3331.1+X	(37/2+) (37/2+) (37/2-) (37/2+)
3756.6+X 4	C	(43/2-)	555 ns 10	18.0S 425.5 2	0.029 2 100 3	[E2] E3	3738.6+X 3331.1+X	(39/2-) (37/2+)
3765.7+X 4	C			434.6 2	100		3331.1+X	(37/2+)
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
3855.0+X 4	C			439.4 2	100		3415.6+X	(37/2+)
3935.4+X 4	C	(43/2-)		178.6 2	100	M1	3756.6+X	(43/2-)
4207.3+X 5	C			352.3 2	100		3855.0+X
4366.8+X 4	C	(45/2+)		431.5 2 610.2 2	98.8 25 100 5	E1	3935.4+X 3756.6+X	(43/2-) (43/2-)
4553.5+X 4	C	(47/2-)		797.3 2	100	(Q)	3756.6+X	(43/2-)
4567.0+X 4	C	(49/2+)	10.47 ns 14	13.5S 200.1 2 810.2 2	10.5 5 100.0 19 59.3 19	[E1] (E2) (E3)	4553.5+X 4366.8+X 3756.6+X	(47/2-) (45/2+) (43/2-)
4686.2+X 5	C	(47/2-)		750.7 2	100	(Q)	3935.4+X	(43/2-)
4882.7+X 4	C	(51/2-)		196.3 2 315.6 2 329.5 2	23 3 100 4 12 3	[E2]	4686.2+X 4567.0+X 4553.5+X	(47/2-) (49/2+) (47/2-)
5372.7+X 5	C	(53/2+)		490.1 2 805.7 2	100 3 47.6 16	D (Q)	4882.7+X 4567.0+X	(51/2-) (49/2+)
5608.6+X 5	C	(55/2-)		725.9 2	100		4882.7+X	(51/2-)
5608.7+X 5	C	(57/2+)	1.66 ns 14	236.0 2	100	E2	5372.7+X	(53/2+)
6033.5+X 5	C	(57/2+)		424.8 2	100		5608.7+X	(57/2+)
6076.4+X 5	C	(59/2+)		467.7 2	100		5608.7+X	(57/2+)
6283.2+X 6	C	(61/2+)		249.7 2	100		6033.5+X	(57/2+)

E(level)	J^π(level)	T_1/2(level)	Comments
0.0	(9/2+)	1.66 ms 2 % α = 100	No ε, β⁺ decay observed. Theoretical estimates: %ε+%β⁺<2×10^-4 (1973Ta30), <7×10^-5 (1997Mo25). E(level): No ε, β⁺ decay observed. Theoretical estimates: %ε+%β⁺<2×10^-4 (1973Ta30), <7×10^-5 (1997Mo25). Member of configuration=πh_9/2⁶~#νg_9/2.
773.0	(15/2-)	67.2 ns 14	E(level): Member of configuration=πh_9/2⁶~#νj_15/2.
1625.3	(17/2+)		E(level): Member of configuration=πh_9/2⁶~#νg_9/2.
1821.2	(21/2+)	25.0 ns 14	E(level): Member of configuration=πh_9/2⁶~#νg_9/2.
1877.8	(25/2+)	7.29 µs 20	Mixed with 2053.8 level by particle octupole coupling. E(level): Mixed with 2053.8 level by particle octupole coupling. Member of configuration=πh_9/2⁵~#πf_7/2~#νg_9/2.
1994.5	(23/2+)		E(level): Member of configuration=πh_9/2⁵~#πf_7/2~#νg_9/2.
2053.8	(25/2+)		Mixed with 1877.8 level by particle octupole coupling. E(level): Mixed with 1877.8 level by particle octupole coupling. Member of configuration=πh_9/2⁶~#νg_9/2.
2214.4	(27/2-)		E(level): Member of configuration=πh_9/2⁴~#πf_7/2~#πi_13/2~# ν_9/2.
2246.9	(29/2-)	1.39 µs 7	E(level): Member of configuration=πh_9/2⁵~#πi_13/2~#νg_9/2.
2246.9+X	(31/2-)		E(level): Member of configuration=πh_9/2⁵~#πi_13/2~#νg_9/2.
3088.8+X	(33/2+)		E(level): Member of configuration=πh_9/2⁴~#πi_13/2²~#νg_9/2.
3143.7+X	(35/2+)		E(level): Member of configuration=πh_9/2⁵~#πf_7/2~#νg_9/2.
3331.1+X	(37/2+)		E(level): Member of configuration=πh_9/2⁵~#πf_7/2~#νg_9/2.
3413.4+X	(37/2-)		E(level): Member of configuration=πh_9/2⁵~#πi_13/2~#νg_9/2.
3415.6+X	(37/2+)		E(level): Member of configuration=πh_9/2⁵~#πf_7/2~#νg_9/2.
3586.4+X	(37/2+)		E(level): Member of configuration=πh_9/2⁴~#πf_7/2²~#νg_9/2.
3738.6+X	(39/2-)		E(level): Member of configuration=πh_9/2⁵~#πi_13/2~#νg_9/2.
3756.6+X	(43/2-)	555 ns 10	μ=15.61 6 (1998St24,2011StZZ) Measured isomer yield ratio: R_exp=7.9 8 (2013Ba29) in ⁹Be(²³⁸U,X) reaction at 1 GeV/nucleon, where R_exp=Y/(N_imp(fragment)γ), N_imp is number of implanted ions, Y is the isomeric yield, F and γ are correction factors for in-flight isomer decay losses and the finite detection time of the γ radiation, respectively. Comparison of measured yield ratios with theoretical values calculated by using ABRABLA Monte-Carlo code. E(level): Measured isomer yield ratio: R_exp=7.9 8 (2013Ba29) in ⁹Be(²³⁸U,X) reaction at 1 GeV/nucleon, where R_exp=Y/(N_imp(fragment)γ), N_imp is number of implanted ions, Y is the isomeric yield, F and γ are correction factors for in-flight isomer decay losses and the finite detection time of the γ radiation, respectively. Comparison of measured yield ratios with theoretical values calculated by using ABRABLA Monte-Carlo code. Member of configuration=πh_9/2⁵~#πi_13/2~#νg_9/2.
3935.4+X	(43/2-)		Octupole-mixed state. E(level): Member of configuration=πh_9/2⁴~#πf_7/2~#πi_13/2~# ν_9/2.
4366.8+X	(45/2+)		E(level): Member of configuration=πh_9/2⁴~#πi_13/2²~#νg_9/2.
4553.5+X	(47/2-)		E(level): Member of configuration=πh_9/2⁵~#πi_13/2~#νg_9/2.
4567.0+X	(49/2+)	10.47 ns 14	μ=18.87 25 (1998St24,2011StZZ) E(level): Member of configuration=πh_9/2⁴~#πi_13/2²~#νg_9/2.
4686.2+X	(47/2-)		E(level): Member of configuration=πh_9/2⁴~#πf_7/2~#πi_13/2~# ν_9/2.
4882.7+X	(51/2-)		E(level): Member of configuration=πh_9/2⁴~#πf_7/2~#πi_13/2~# ν_9/2.
5372.7+X	(53/2+)		E(level): Member of configuration=πh_9/2⁴~#πi_13/2²~#νg_9/2.
E(level)	J^π(level)	T_1/2(level)	Comments
5608.6+X	(55/2-)		E(level): Member of configuration=πh_9/2³~#πf_7/2²~# πi_13/2~#νg_9/2.
5608.7+X	(57/2+)	1.66 ns 14	E(level): Member of configuration=πh_9/2⁴~#πi_13/2²~#νg_9/2.
6033.5+X	(57/2+)		E(level): Member of configuration=πh_9/2³~#πf_7/2~# πi_13/2²~#νg_9/2.
6076.4+X	(59/2+)		E(level): Member of configuration=πh_9/2³~#πf_7/2~# πi_13/2²~#νg_9/2.
6283.2+X	(61/2+)		E(level): Member of configuration=πh_9/2³~#πf_7/2~# πi_13/2²~#νg_9/2.