Nuclear Data Evaluation for Mass Chain A=217:Odd-Proton Nuclei.

Thallium (81(217)Tl, Bismuth (83(217)Bi), Astatine (85(217)At), Francium (87(217)Fr), Actinium (89(217)Ac) and Protactinium (91(217)Pa) are of odd-proton numbers among the mass chain A = 217. In the present work, the half-lives and gamma transitions for the six nuclei have been studied and adopted based on the recently published interactions or unevaluated nuclear data sets XUNDL. The Q (α) has been updated based on the recent published work of the Atomic Mass Evaluation AME2012 as well. Moreover, the total conversion electrons as well as the K-Shell to L-Shell, L-Shell to M-Shell and L-Shell to N-Shell Conversion Electron Ratios have been calculated using BrIcc code v2.3. An updated skeleton decay scheme for each of the above nuclei has been presented here. The decay hindrance factors (HF) calculated using the ALPHAD program, which is available from Brookhaven National Laboratory's website, have been calculated for the α- decay data sets for (221)Fr-, (221)Ac- and (221)Pa-α-decays.

Introduction

Alvarez-Pol et al., [1] identified 217Tl from the 9Be(238U, x) reaction when a 1 GeV/nucleon beam from the <pan class="Chemical">span class="Chemical">SIpan>S18 <sppan>an class="CellLine">synchrotron at the Gesellschaft für Schwerionenforschung (GSI), Germany at an intensity of 1.5 ×109 ions/spill bombarded a 9Be target of 2500 gm/cm2. The 217Tl isotope was separated by means of a high resolving power magnetic spectrometer Fragment Separator (FRS). Two plastic scintillators and two multisampling ionization chambers were used to identify the nuclide based on the magnetic rigidity, time–of -flight, energy loss and atomic number. However, the discovery of the 217Bi isotope was attributed to Pfützner et al., [2] using the same facility. The spectrum was investigated by means of γ-γ, α-γ coincidence and spectrum-multiscaling measurements [3]. The RISING array of 15 Ge clusters was used to detect the γ- rays. Each cluster has seven elements.

Fry and Thoennessen [4] reported that tn class="Disease">hirty–nine isotopes of <span class="Chemical">Astatine (At) have been discovered based on the Hartree-Fock-Bogoliubov model (HFB-14). Meanwhile, the discovery of 217At was reported in 1947 by Hagemann et al., [5] and English et al., [6], by studying the decay series (4n+1) of 233U. The half-life was reported to be 18 ms.

Hahn et al., [7] reported the observation of 217Fr through the decay of 229Np produced in 233U(p, 5n) reactions in wn class="Disease">hich a beam of protons of 32–41.6 MeV bombarded an enriched 233U target in the Oak Ridge Isochronous Cyclotron. The α emis<span class="Chemical">sions were measured by a surface–barrier <span class="Chemical">Si(Au) detector. The measured α was reported to be 8.31±0.02 MeV.

Valli and Hyde [8] observed the 217n class="Chemical">Pa in 1968 through (6n) and (1p8n) fusion-evaporation reactions. In these reactions 203Tl and 206Pb targets were bombarded by 166 MeV 20Ne beams from the Berkeley HILAC. The recoils were depo<span class="Chemical">sited on a metallic surface in front of a semiconductor detector with a helium gas jet recoil transport apparatus [9]. The adopted half-life by Akovali [10] was 3.48(9) ms. Several years later, in 1972, Nomura et al., reported the observation of 217Ac through a (5n) fusion–evaporation reaction in which a 91 MeV 14N beam from the RIKEN IPCR cyclotron bombarded a 208Pb target [11]. Alpha-particle spectra were measured with a surface-barrier Si detector. The measured half-life for the 217Ac was 0.10± 0.01μs, whereas, the adopted one by Akovali [10] was 69(4) ns.

The latest nuclear decay data evaluations for the above <pan class="Chemical">span class="Chemical">nuclidespan> were carried out by Akovali in 2003 [10]. The reported half- lives for <sppan>an class="Chemical">217Bi,217At,217Fr,217Ac and 217Pa, were 93(3) s, 32.3(4) ms, 19(3) μs, 69(4) ns and 3.6(8) ms, respectively. There was no record for 217Tl in 2003. An updated evaluation for 217Tl was in 2011, whereas, for 217Bi it was in 2014, both of which are available at Brookhaven National Laboratory's website: www.nndc.bnl.gov. This paper presents the results of the evaluations of the odd-proton nuclei among the members of the mass chain A = 217 (217Tl, 217Bi, 217At), 217Fr, 217Ac and 217Pa), which have been performed in the frame of the KASCT Research Contract no. 11-MAT2037-03, using the procedures adopted by the DDEP working group. The references cut-off date was 2015, March 31. The calculated and adopted parameters will be used to update the Evaluated Nuclear Structure and Decay Data Files (ENSDF) for those nuclides under consideration, which were appraised in 2003. The complete and updated datasets for all nuclides are of great importance for the development of different aspects of nuclear technologies.

Procedure for Decay Data Evaluation

The half-life of 217At was measured u<pan class="Chemical">span class="Chemical">sipan>ng the ion-implanted technique by measuring α- and β- particles from weak <sppan>an class="Chemical">225Ac sources [12]. The decay series of the 225Ac was studied by a 900 mm2 Canberra Passivated Implanted Planar Silicon (PIPS) detector in a quasi 2π counting system. Recoils from 225Ac were collected to measure the half-life of 221Fr, which is the parent of 217At. It was reported that the possible configuration for 217At in analogy to 215At is ((π h9/2)+2(π f7/2)(ν g9/2)-4) [13, 14].

Actinium-217 was produced from the 221n class="Chemical">Pa α- decay [15] and from the (HI, xnγ) reactions such as 205Tl (16O, 4n), 206Pb (15N, 4n) and 209Bi (12C, 4n) reactions u<span class="Chemical">sing a 96 MeV 16O, 80 MeV 15N and 75 MeV 12C beams [16]. The half-life of <span class="Chemical">217Ac was deduced from alpha-gamma (αγ), gamma-gamma (γγ), alpha-conversion electron (α-ce) and (ce-ce) coincidence experiments. Whereas, 217Fr was produced from 221Ac α- decay or from 210Pb (11B, 4nγ) using a 11B beam of energy ranges from 52 to 68 MeV [17]. The measured spectrum has been studied using the γ-γ coincidence techniques.

The calculation of the n class="Disease">hindrance factor(s) of β—decay or the so-called log ft value was carried out for the direct feeding(s) to the excited states in the β—decay. The electron capture (ε) decays have generally been computed by the evaluator from the I(γ+ce) inten<span class="Chemical">sity balances at each level. The log ft values describe the shape of the spectrum and can be discussed as follows.

The total decay constant λ for a constant nuclear matrix element η is given as: where, ƒ(Z,Q) is a Fermi integral, wn class="Disease">hich is constant for a given β—decay and can be calculated by numerical expres<span class="Chemical">sions. g is the strength of the weak interaction between the nucleons, electron and the neutrino which is constant and as<span class="Chemical">signed as 0.88×10−4 MeV.fm3. me is the mass of the electron and C is the speed of light. And η is a constant nuclear matrix element representing the overlap between the final and initial nuclear states.

Eq 1 can be rewritten in terms of the half-life of the parent t1/2 as:

The logarithm of the left hand <pan class="Chemical">span class="Chemical">sipan>de in Eq 2 is called log ft. A rapid method to calculate the log ft values has been reported in [18]. The β—decay tran<sppan>an class="Chemical">sitions between the initial and final states can be clas<span class="Chemical">sified based on the log ft values from [19, 20] in Table 1.

Table 1

The β—decay transitions between the initial and final states.

Transition Type	Log ft	Spin change lβ	Parity change (Δπ)
Super-allowed	2.9–3.7	0	No
Allowed	4.4–6	0	No
First forbidden	6–10	1	Yes
Second forbidden	10–13	2	No
Third forbidden	>15	3	Yes

The n class="Disease">hindrance factors HF in the α- decay are calculated by Eq 3: Where, is the partial half-life for the excited state having a given α—decay branching ratio P . All the theoretical half-life values in the present evaluation were obtained from the spin-independent equations of Preston [21]. Five classes of α- tran<span class="Chemical">sitions were found based on the HF values. For the hindrance factor between 1 and 4, the tran<span class="Chemical">sition is called a favored transition in which the emitted α- particle is assembled from two low lying pairs of nucleons in the parent nucleus, leaving an odd nucleon in its initial orbital. For hindrance factors between 4 and 10, it indicates a mixing or favorable overlap between the initial and final nuclear states. For values between 10 and 100, it indicates that the spin projections of both initial and final states are parallel, but the wave-function overlap is not favorable. For values ranging from 100 up to1000, it indicates that the transitions occur with a change in parity but with projections of initial and final states being parallel. Finally, for hindrance factors of >1000, it indicates that the transition involves a parity change and a spin flip.

The electric quadrupole tran<pan class="Chemical">span class="Chemical">sipan>tion probability B(E2: ) and the energy ratio R(4/2) = E(4+ 1)/E(2+ 1) were calculated from the proton-neutron interaction, which is proportional to the product of the number of active protons and neutrons (NpNn).

The associated log ft values, the n class="Disease">hindrance factors, and the statistical analysis of γ–ray data and the deduced level schemes were calculated using the computer codes LOGft, ALPHAD, BrIcc, which are available at Brookhaven National Laboratory's website: www.nndc.bnl.gov. The weighted average values for half-lives were calculated when we want to calculate an average that is based on different percentage values for several categories or when we have a group of values with frequencies associated with it using the AveTool code. All associated uncertainties are expressed at the k = 1 confidence level (i.e. 68% coverage). Using level energies from measured values of energies of transitions, the GTOL code was used to determine the intensity balance. The absolute intensities of γ-rays and the normalization factor for the transferring of the relative intensities to the intensities per 100 decays of the parent nucleus have been calculated using the GABS code. In addition, the theoretical conversion coefficients were deduced from the BrIcc code: v2.3S (29–March–2011) [22] with "Frozen Orbitals" approximation, and with an implicit uncertainty of 1.4% (k = 2 confidence level). The probabilities of internal conversion are represented as conversion coefficients by Eq 4: Where, λ and λ are the probabilities for emission of conversion electrons and γ’s, respectively [23]. The total conversion coefficient represents the sum of the probabilities of conversion electrons in different atomic shells as in Eq 5: where,

The conver<pan class="Chemical">span class="Chemical">sipan>on coefficients for mixed tran<sppan>an class="Chemical">sitions are given as a function of a mixed ratio δ as in Eq 7:

The values of Q(β), Q(α), and the separation energies of the neutrons and the protons Sn and <pan class="Chemical">span class="Chemical">Sppan> were calculated u<sppan>an class="Chemical">sing the 2012 Atomic Mass Evaluation code (AME2012), available from the Atomic Mass Data Center (AMDC), Institute of Modern Phy<span class="Chemical">sics (IMP), Chinese Academy of Sciences [24].

Results and Discussions

The Q-values, the separation energies of the neutron, the proton, the two neutrons and the two protons (Sn, <n class="Chemical">span class="Chemical">Sp, S(2N) and S(2P), respn>ectively, as well as their associated uncertainties were calculated u<span class="Chemical">sing the Atomic Mass Evaluation AME2012 for and and listed in Table 2, respectively. All energies are expressed in keV unless otherwise noted. All associated uncertainties are expressed at the k = 1 confidence level (i.e. 68% coverage).

Table 2

Evaluated Q-values and separation energies of the neutrons and the protons Sn,Sp, S(2N) and S(2P).

	Tl81217	Bi83217	At85217	Fr87217	Ac89217	Pa91217
Qβ-	6073 SY* (499)	2845(19)	737(6)	-1573(11)	-3514(24)	-5901 SY(113)
Sn	4476 SY (499)	5215(21)	5933(6)	6728(8)	7512(16)	8800(7)
Sp	8835 SY (566)	6039 SY(200)	4677(5)	3227(9)	1877(14)	520(5)
Qα		4520(30)	7201(12)	8469(4)	9832(10)	8489(4)
Q(β-N)**	2762 SY (466)
S(2N)	7741 SY (499)	9061(23)	10492(8)	12146(9)	13470(17)	16940(9)
S(2P)		15759(299)	11831(16)	9008(9)	6193(13)	3540(5)
Q(ECP)***						1640(5)

* SY means deduced from systematic trend.

** is β-decay followed by a neutron emission Q-value.

***ECP is the electron capture followed by a proton emission.

* <pan class="Chemical">span class="CellLine">SYpan> means deduced from <sppan>an class="CellLine">systematic trend.

** is β-decay followed by a neutron emis<pan class="Chemical">span class="Chemical">sipan>on Q-value.

***<pan class="Chemical">span class="Chemical">ECPpan> is the electron capture followed by a proton emis<sppan>an class="Chemical">sion.

The measured half -lives T1/2 and the Predicted n class="Chemical">spin-parity values Jπ (“from <span class="CellLine">systematics and calculations”) for the ground states g.s. of the <span class="Chemical">nuclides under consideration are listed in Table 3.

Table 3

The measured half-lives T1/2 and predicted spin-parity Jπ values.

	Tl81217	Bi83217	At85217	Fr87217	Ac89217	Pa91217
T1/2	>300 ns	98.5(13) s	32.8(3) ms	19(3) μs	69(4) ns	3.6(8) ms
Jπ	1/2+	(9/2-)	9/2-	9/2-	9/2-	9/2-
references	[1]	[25–27]	[12]	[10, 28–31]	[10]	[32–37]

The decay Data for the ground state g.s for <pan class="Chemical">span class="Chemical">217Bipan> was only available in the previous evaluation [10]. However, new energy levels and γ- <sppan>an class="Species">rays have been measured from the 9Be (238U,X) in [24-26]. Meanwhile, the half-life of <span class="Chemical">217Bi was adopted from the weighted average of the half-lives of the γ- transitions through the α decay of 217Po [27], which were 93(3) s for 254.1 γ, 100.5(13) s and 98(1) s for 264.4 γ [26], respectively. In Table 3, the half-life of 217Fr was adopted in [28] from the unweighted average measured half-lives of 22(5) μs [29], 16(2) μs [28, 30] and 15(3) μs [31], respectively. Similarly, the half-life of 217Pa is adopted in the present evaluation from the unweighted average of the measured half-lives of 4.9(6) ms, 3.4(2) ms, 2.3(+5–3) ms, 3.4(1) ms and 3.8(2) ms [32-36], respectively. Meanwhile, Jπ was predicted from systematics and calculations in [37]. The half- life of 217At and its uncertainty were reported in [12].

The energy levels with their uncertainties, their n class="Chemical">spins-parities Jπ, the gamma- transition energies Eγ, their intensities Iγ (%), their associated uncertainties, their assigned multipolarities (MULTI.), the internal conversion coefficients (Ice(K)), and the total internal conversion coefficients (Icc) with their associated uncertainties calculated using BrIcc v2.3S for 217Bi, 217At, 217Fr, 217Ac and 217Pa are listed in Tables 4–8, respectively.

Table 4

217Bi nuclear energy levels and associated properties [3].

Energy Levels (keV)	Jπ	Eγ (keV)	Iγ	MULTI.	α(K) ×10−3	α(L) ×10−3	α(M) ×10−3	α(N)×10−3	Icc ×10−3
0.0	(9/2-)			[E2]
744(1)	(13/2-)	744	100	[E2]	9.66(14)	2.26(4)	0.55(8)	0.14(20)	12.7
1236(1)	(17/2-)	492	100	[M1,E2]	22.2(4)	7.33(11)	1.83(3)	0.46(7)	31.9
1429(2)	(15/2-, 17/2-)	685	100	[E2]	27.0(16)	4.9(22)	1.2(5)	0.3(13)	33.0
1436(2)	(21/2-)	200	100	[E2]	167.7(24)	209.(3)	55.0(8)	14.0(20)	449.0
1436+x*	(25/2-)	20–90

* Uncertainties were not given by the authors.

Square brackets [] in the MULTI column are used to denote a value deduced solely from level scheme considerations, whereas, parentheses () around Jπ values are used to indicate that the values are based on weak arguments.

Table 8

217Pa nuclear energy levels and associated properties [10, 39–40].

Energy Levels (keV)*	Jπ	Eγ **(keV)	Iγ	MULTI.***
0.0	9/2-****
1854(7)*****	29/2+******

* The energy level was calculated in the previous evaluation [10] from the difference between the energies of the 10157- and 8337-keV α's, which were emitted from the 1850 keV and the 0.0 states, respectively.

**No further information about γ-transitions.

*** No multipolarities were assigned and therefore BrIcc cannot be run.

****The Jπ was measured in [39].

***** This energy level was observed by α-γ spectroscopy in [39].

******The Jπ was measured in [40].

Square brackets [] in the MULTI column are used to denote a value deduced solely from level scheme con<pan class="Chemical">span class="Chemical">sipan>derations, whereas, parentheses () around Jπ values are used to indicate that the values are based on weak arguments.

* The mixing ratio for the mixed multipolarities and the associated uncertainties δ for Eγ = 96.3 and 282.12 keV were calculated to be 0.7(7) and 1(5), repan class="Chemical">spectively, from the αγ coincidence data in [38].

*** The Multipolarities were deduced by [17] from gamma-ray angular distributions and angular correlations. <pan class="Chemical">span class="Chemical">Sipan>nce no delay component was observed in γγ(t), M2 multipolarities were ruled out for quadrupole tran<sppan>an class="Chemical">sitions in 217Fr.

*Uncertainties in the energy levels and in the Eγs were not given by the authors in [15] from the (pan class="Disease">HI,xnγ).

** The mixing ratio for the mixed multipolarities and the associated uncertainties for Eγ = 670.1, 489, 351.5 and 153.8 keV were <2, 0.65(20±1), 0.39(8) and 0.15(5), repan class="Chemical">spectively.

* The energy level was calculated in the previous evaluation [10] from the difference between the energies of the 10157- and 8337-keV α's, wpan class="Disease">hich were emitted from the 1850 keV and the 0.0 states, repan class="Chemical">spectively.

**No further information about γ-tran<pan class="Chemical">span class="Chemical">sipan>tions.

*** No multipolarities were as<pan class="Chemical">span class="Chemical">sipan>gned and therefore BrIcc cannot be run.

***** Tpan class="Disease">his energy level was observed by α-γ pan class="Chemical">spectroscopy in [39].

The α- energies, α- inten<pan class="Chemical">span class="Chemical">sipan>ties, their associated uncertainties and the hindrance factors HF calculated by LOG ft are listed in Table 9 for 217At, 217Fr and <sppan>an class="Chemical">217Ac from the 221Fr-, 221Ac- and 221Pa- α decays, respectively.

Table 9

The α- energies (Eα), α- intensities (Iα, in %), their associated uncertainties and the hindrance factors HF calculated by LOG ft for 217At, 217Fr and 217Ac.

217At [41]				217Fr [42]				217Ac [29]
Eα	Elevel	Iα	HF	Eα	Elevel	Iα	HF	Eα	Elevel	Iα	HF
5500(40)	891.9	0.0009(20)		7170(10)	484	≈ 2	4.4(20)	9075(30)	0.0	≤100	1.4
5530(25)	809.3	0.0009(20)		7377(10)	273	9(2)	6.2(17)
5689(3)	664.4	0.002(1)	150(80)	7440(15)	209	21(5)	4.3(13)
5697(4)	652	≈0.001	340	7645(10)	0.0	68(5)	6.3(11)
5776(3)	577.5	0.06(1)	13(3)
5783(4)	568.5	0.005(2)	170(70)
5813(3)	537.5	0.004(2)	300(16)
5925(3)	424.3	0.03(1)	140(50)
5938.9(20)	410.6	0.17(3)	28(5)
5965.9(25)	382.3	0.08(1)	79(11)
5979.9(20)	368.2	0.49(3)	15(2)
6037(3)	310.3	0.003(2)	4.5×10+3(30)
6075.9(20	272.0	0.15(3)	130(30)
6126.3(15	218.1	15.1(2)	2.3(1)
6243(20)	100.3	1.34(10)	83(7)

In Table 9, Eα’s, Iα’s and their associated uncertainties for 217At were measured in [41], except for Eα’s = 5500 and 5530, wn class="Disease">hich were measured from the α-γ coincidence spectrum in [42]. For 217Fr and <span class="Chemical">217Ac, they were measured in [42] and [29], resppan>ectively.

The isomeric state energy levels (Elevel), their percentage decay by isomeric tran<pan class="Chemical">span class="Chemical">sipan>tion (% IT), their Jπ, and their measured half-lives for <sppan>an class="Chemical">217Bi, <span class="Chemical">217Ac and 217Pa, respectively, are listed in Table 10.

Table 10

Isomeric states and their properties for 217Bi, 217At and 217Ac.

217Bi [27]				217Ac [15]				217Pa [17]
Elevel	%IT	Jπ	T1/2	Elevel	%IT	Jπ	T1/2	Elevel	%IT	Jπ	T1/2
1436+x	100	(25/2-)	3.0(2) μs	1146.7(8)	≥ 99.7	17/2-		1850	27(4)		1.2(2) ms
				1149.2(10)	≥ 98.3	15/2-
				1498.2(9)	≥ 99.0	19/2-	8(2) ns
				1528.5(9)	≥ 99.6	21/2-	<10ns
				2013	≥ 95.7(10)	(29/2+)	740(40) ns

In Table 10, the half-live T1/2 for the E = 1436+x in <pan class="Chemical">span class="Chemical">217Bipan> was measured in [27], whereas for <sppan>an class="Chemical">217Ac, it was measured from the γγ prompt coincidences in [15]. Meanwhile, for 217Pa, it was calculated as an unweighted average of 1.6(10) ms [32], 0.(6) ms [43], 1.5(2) ms [44] and 1.5(+9–4) ms [34], respn>ectively. B(E2) was calculated for 217Bi from the systematics of neighboring nuclides and ranges from 0.00062(3) for x = 20 keV for the isomeric states 1436+x keV to 0.00044(2) for x = 90 keV [3]. In addition, an octupole deformation has been noticed in 217Fr from the large value of B(E1)/B(E2) [17].

Skeleton schemes for 217Tl, <pan class="Chemical">span class="Chemical">217Bipan>, 217At, 217Fr, <sppan>an class="Chemical">217Ac and 217Pa are shown in Fig 1. The complete decay schemes of 217Bi, 217At, 217Fr, 217Ac and 217Pa based on the current evaluation (S1–S12 Datasets) are shown in Figs 2–6, respectively. Gamma transition energies with their emission probabilities, spins and parities for energy levels, hindrance factors for α- decays and band structures are included in the figures. Whereas, Intensities I(γ+ce) are expressed per 100 parent decays.

Fig 1

A skeleton scheme for A = 217: Odd- proton nuclei.

Fig 2

The complete decay scheme of 217Bi based on the current evaluation.

Gamma transition energy is in blue color, the black lines are for the level energies of 217Bi, whereas, the green color is for the half- lives and red color is for the decay type.

Fig 6

The complete decay scheme of 217Pa based on the current evaluation.

Gamma tran<pan class="Chemical">span class="Chemical">sipan>tion energy is in blue color, the black lines are for the level energies of <sppan>an class="Chemical">217Bi, whereas, the green color is for the half- lives and red color is for the decay type.

The complete decay scheme of 217At based on the current evaluation.

Gamma tran<pan class="Chemical">span class="Chemical">sipan>tion energy and multipolarities are in blue color, the black lines are for the level energies of 217At, whereas, the green color is for the half- lives and red color is for the α- decay properties (Eα, Iα and HF).

The complete decay scheme of 217Fr based on the current evaluation.

A) the α- decay properties (Eα, Iα and HF) in red color. B) Gamma tran<pan class="Chemical">span class="Chemical">sipan>tion energy is in blue color, the black lines are for the level energies of 217 Fr, whereas, the green color is for the half- lives.

The complete decay scheme of 217Ac based on the current evaluation.

A) the α- decay properties (Eα, Iα and HF) in red color. B) Gamma tran<pan class="Chemical">span class="Chemical">sipan>tion energy is in blue color, the black lines are for the level energies of 217 Ac, whereas, the green color is for the half- lives.

Conclusions

The evaluated nuclear structure data files (ENSDF) for <pan class="Chemical">span class="Chemical">nuclidespan> of odd-proton numbers among the mass chain A = 217 ( and ) have been updated in the present work. All literature works have been studied until the cut-off date April 2015. The half-lives, the Q (α) and Q (β) values, the total conver<sppan>an class="Chemical">sion electrons as well as the K-Shell to L-Shell, L-Shell to M-Shell and L-Shell to N-Shell conversion electron ratios have been reevaluated and adopted in the present work. Moreover, an updated skeleton decay scheme for each of the above nuclei has been presented here. In addition, the updated decay schemes include the assigned multipolarities, the emission probabilities, gamma-transitions and the evaluated decay hindrance factor (HF) for α-decays whenever possible. The new ENSDF datasets for the above nuclides have been sent to the National Nuclear Data Center (NNDC) at Brookhaven National Laboratory (BNL) for consideration of online publication.

Adopted levels for 217Tl.

(TXT)

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Adopted levels, Gammas for 217Bi.

(TXT)

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98E (238U, x)217Bi.

(TXT)

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Adopted levels, Gammas for 217At.

(TXT)

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221Fr alpha decay

.

(TXT)

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Adopted levels, Gammas for 217Fr.

(TXT)

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221Ac alpha decay.

(TXT)

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(TXT)

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Adopted levels, Gammas for 217Ac.

(TXT)

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(HI, xnγ) 217Ac.

(TXT)

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221Pa alpha decay.

(TXT)

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Adopted levels, Gammas for 217Pa.

(TXT)

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Table 5

217At nuclear energy levels and associated properties [38].

Energy Levels (keV)	Jπ	Eγ (keV)	Iγ	MULTI.*	α(K)×10−3	α(L)×10−3	α(M)×10−3	α(N)×10−3	Icc×10−3
0.0	9/2-
100.25(2)	7/2-	100.25(2)		M1	9.66(14)	1.76(25)	0.416(6)	0.198(16)	11.97(17)
218.12(2)	5/2-	117.82(3)	0.2(12)	M1	6.13(9)	1.10(16)	0.261(4)	0.068(10)	7.58(11)
		218.12(2)	100(2)	E2	0.138(20)	0.17(24)	0.045(7)	0.017(17)	0.367(6)
272.07(4)	3/2-	53.81(3)	16(4)	M1		10.79(16)	2.56(4)	0.662(10)	14.17(20)
		171.82(3)	100(40)	E2	0.226(4)	0.471(7)	0.126(18)	0.033(5)	0.886(12)
368.23(4)	(3/2)-	96.3(3)	15(7)	M1+ E2		3.5(16)	0.9(5)	0.23(12)	4.7(21)
		150.21(3)	100(5)	M1	3.08(5)	0.550(8)	0.130(19)	0.034(5)	3.8(6)
382.34(4)	(7/2)-	282.12(9)	21(3)	(M1+ E2)	0.30(23)	0.077(17)	0.019(4)	0.005(9)	0.41(25)
		382.34(4)	100(6)	M1	0.231(4)	0.041(6)	0.010(14)	0.0024(4)	0.284(4)
410.64(5)	(13/2)-	410.64(5)		E2	0.034(5)	0.015(22)	0.004(6)	0.001(15)	0.055(8)
424.35(7)	(5/2,7/2,9/2)-	324.10(6)		M1	0.362(5)	0.064(9)	0.015(22)	0.004(6)	0.446(7)
537.5(5)	(9/2+)	437.0(5)	19(3)
		537.8(8)	100(10)
568.5(3)	(7/2,9/2)	468.3(7)	100(22)
		568.5(3)	86(29)
577.0(5)	(7/2)-	208.3(6)	12.5(25)	M1	0.077(11)	0.013(19)	0.003(5)	0.001(12)	0.095(14)
		359.86(4)	100(5)
		576.9(4)	7.3(10)
652.0(2)	9/2-	652.0(2)
664.4(2)	7/2-	282.12
		446.30(8)
		562.3(12)	100(9)
		665.0(2)
809.3(2)	5/2-	809.3(2)
891.9(3)	3/2-	891.9(3)

* The mixing ratio for the mixed multipolarities and the associated uncertainties δ for Eγ = 96.3 and 282.12 keV were calculated to be 0.7(7) and 1(5), respectively, from the αγ coincidence data in [38].

Table 6

217Fr nuclear energy levels and associated properties [17].

Energy Levels (keV)	Jπ	Eγ (keV)*	Iγ**	MULTI.***	α(K)×10−3	α(L)×10−3	α(M)×10−3	α(N)×10−3	Icc×10−3
0.0	9/2-
209(20)
275(15)
363.6(3)	13/2-	363.6(3)		E2	46.6(7)	27.2(4)	7.10(11)	1.86(3)	83.2(12)
484(15)
704.2(5)	17/2-	340.6(3)		E2	53.4(8)	34.5(5)	9.03(13)	2.37(4)	99.0(15)
1077.0(6)	21/2-	372.8(3)		E2	44.3(7)	24.9(4)	6.48(10)	1.70(25)	77.7(11)
1256.1(6)		179.1(3)
1355.0(6)	23/2+	278.0(3)		E1	33.8(10)	5.97(18)	1.42(5)	0.369(11)	40.7(12)
1509.7(6)	25/2-	154.4(3)		E1	130.5(20)	26.0(4)	6.22(10)	16.1(24)	164.7(25)
		432.8(3)		E2	32.6(5)	14.8(21)	3.84(6)	1.0(15)	52.5(8)
1688.9(7)	(+)	334.0(3)		(E2)	55.7(5)	37.0(14)	9.70(4)	2.55(10)	106(4)
		423.6(3)		(E2)	32.6(5)	32.6(5)	3.84(6)	10.0(15)	53.6(8)
1713.8(7)	27/2+	204.0(3)
		358.0(4)		E2	47.9(7)	28.5(4)	7.45(11)	1.95(3)	86.3(13)
1988.5(7)	29/2-	274.7(3)
		478.8(3)		E2	26.6(4)	10.7(15)	2.74(4)	0.717(11)	40.9(6)
2111.1(8)	31/2+	122.5(3)
		397.4(3)		E2	38.8(6)	19.9(3)	5.16(8)	1.35(20)	65.5(10)
2154.5(8)		465.6(3)
2516.5(9)	35/2+	405.4(3)
2582.0(9)		427.5(3)		E2	33.4(5)	15.5(22)	4.0(6)	1.05(15)	54.2(8)
2618.0(9)		507.0(3)
3002.3(9)	39/2+	485.8(3)		E2	25.8(4)	10.2(15)	2.61(4)	0.684(10)	93.5(6)

* 210Pb(11B,4nγ) 217Fr.

** Iγs were not given by the authors in [17].

*** The Multipolarities were deduced by [17] from gamma-ray angular distributions and angular correlations. Since no delay component was observed in γγ(t), M2 multipolarities were ruled out for quadrupole transitions in 217Fr.

Table 7

217Ac nuclear energy levels and associated properties [15].

Energy Levels(keV)*	Jπ	Eγ (keV)	Iγ	MULTI.**	α(K)×10−3	α(L)×10−3	α(M)×10−3	α(N)×10−3	Icc×10−3
0.0	9/2-
660.3(5)	13/2-	660.3		E2	15.4(22)	4.74(7)	1.19(17)	0.318(5)	21.8(3)
670.1(5)	11/2-	670.1		M1+E2	40.0(3)	9.0(5)	2.1(10)	0.6(3)	50.0(4)
1146.7(8)	17/2-	486.4		E2	27.5(4)	11.8(17)	3.05(5)	0.811(12)	43.4(6)
1149.2(10)	15/2-	478.9	100(25)	E2	27.5(4)	11.8(17)	3.05(5)	0.811(12)	43.4(6)
		489	75(25)	M1(+E2)	100(7)	21.0(10)	5.10(22)	1.40(6)	120(9)
1498.2(9)	19/2-	349	76(10)	E2	52.9(8)	36.9(6)	9.75(14)	2.59(4)	0.103(15)
		351.5	100(10)	M1+E2	310(5)	6.60(6)	16.1(12)	5.8(4)	400(6)
1528.5(9)	21/2-	381.8		E2	44.2(7)	26.7(4)	7.02(10)	1.87(3)	80.3(12)
1682.3	(23/2)-	153.8		M1+E2	3710(20)	835(14)	205(5)	74.2(19)	4830(18)
1792	(25/2)-	110		M1	10310(15)	1970(3)	0.473(7)	0.125(18)	12920(18)
1916	(27/2)-	234		E2	0.118(17)	0.175(25)	47.2(7)	12.6(18)	0.357(5)
2013	(29/2)+	96	50(10)	E1+M2	1200(9)	0.320(23)		0.120(9)	1600(12)
		220	100(20)	M2	5310(8)	1721(24)	0.444(7)	0.119(17)	7620(11)

*Uncertainties in the energy levels and in the Eγs were not given by the authors in [15] from the (HI,xnγ).

** The mixing ratio for the mixed multipolarities and the associated uncertainties for Eγ = 670.1, 489, 351.5 and 153.8 keV were <2, 0.65(20±1), 0.39(8) and 0.15(5), respectively.