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USNDP

7Li (1974AJ01)


(See Energy Level Diagrams for 7Li)

GENERAL: See also (1966LA04) and Table 7.1 [Table of Energy Levels] (in PDF or PS).

Shell model: (1961KO1A, 1965CO25, 1965KU09, 1965VO1A, 1966BA26, 1966HA18, 1966WI1E, 1967BO1C, 1967BO22, 1967CO32, 1967FA1A, 1969GU03, 1969TA1H, 1969VA1C, 1970ZO1A, 1971CO28, 1972LE1L, 1973HA49, 1973KU03).

Cluster model: (1965NE1B, 1968HA1G, 1968KU1B, 1969ME1C, 1969SM1A, 1969VE1B, 1969WI21, 1970BA1Q, 1972HA06, 1972HI16, 1972JA23, 1972KU12, 1972LE1L, 1973KU03, 1973KU12).

Rotational and deformed models: (1965VO1A, 1966EL08).

Special levels: (1966BA26, 1966EL08, 1967BO22, 1967CO32, 1967FA1A, 1969GU03, 1969HA1G, 1969HA1F, 1970FR1C, 1971CO28, 1972BB26, 1973AS02, 1973FE1J, 1973MA1K).

Electromagnetic transitions: (1965CO25, 1965KU09, 1966BA26, 1966EL08, 1967BO22, 1968EL06, 1968KU1D, 1969HA1G, 1969HA1F, 1969VA1C, 1973AS02, 1973HA49, 1973HA1V, 1973SU1C).

Astrophysical questions: (1967DA1C, 1967MI1A, 1968HA1C, 1969BA2A, 1970BA1M, 1972CL1A, 1972KO1E, 1972RA30, 1973AU1H, 1973LA19, 1973RE1G, 1973SA1J, 1973SC1T, 1974AU1A).

Special reactions: (1965GR1C, 1965ZH1A, 1967AU1B, 1968YI01, 1969GA18, 1969YI1A, 1972HA06, 1972RA30, 1972VO06, 1973KO1D, 1973KU03, 1973LA19, 1973OS1C, 1973PF02).

Muon capture: (1965LO1B, 1969WU1A, 1970FA15, 1971DE2D, 1973MU11).

Pion capture and reactions: (1966DA1A, 1966DE1G, 1968BO32, 1968BO1T, 1968KU1B, 1968LO1A, 1968NO1A, 1968PE1B, 1968WI1B, 1969BU1C, 1969KO30, 1969MI10, 1969MI1G, 1969MO1E, 1970BA1E, 1970BO1V, 1970JA23, 1971CA01, 1971CA1J, 1971FA09, 1971KO02, 1972GO1L, 1972HU1A, 1972SW1A, 1973BA2R, 1973BA2V, 1973BA2G, 1973DO1F, 1973NY04, 1973PE1E, 1973SQ01).

Kaon reactions: (1973BA1Y).

Other topics: (1965CO25, 1965VO1A, 1966DE1E, 1966HA18, 1966WI1E, 1966YO1B, 1967BO1C, 1967CA17, 1967FA1A, 1968EL06, 1969GU03, 1969HE1N, 1969HO1M, 1970HO1J, 1970ZO1A, 1971BA2Y, 1971CH1H, 1971GR16, 1971ZA1D, 1972AB14, 1972AN05, 1972BB26, 1972CA37, 1972DA21, 1972FR09, 1972GA1L, 1972LE1L, 1972PN1A, 1973BA1Y, 1973CL09, 1973JU2A, 1973KU03, 1973MA48, 1973RO1R).

Ground state properties: (1965CO25, 1965HU13, 1965KU09, 1965MO17, 1965PR04, 1965VO1A, 1966BA26, 1966CA1F, 1966EL08, 1966WI1E, 1967BO22, 1967PA1G, 1967SH05, 1967SH14, 1968PE1B, 1969GU03, 1969PE1D, 1969VA1C, 1972FR09, 1972LE1L, 1973DO1F, 1973MA1K).

μ = +3.2564 nm (1969FU11, 1971SH26);

μ = 3.255985 (2) nm [quoted in (1973CO1P)];

Q = -0.058 ± 0.010 b (1966IS01);

Q = -0.04 b (1969FU11); see also (1971SH26, 1972BA77).

B(E2: 3/2- → 1/2-) = 8.3 ± 0.6 e2 · fm4 (1972HA06, 1973HA47);

= 7.4 ± 0.1 e2 · fm4 (1972BA77) [see also (1973HA47)].

1. 3H(α, γ)7Li Qm = 2.4668

Excitation functions and angular distributions have been studied for Eα = 0.5 to 1.9 MeV (1959HO03, 1961GR27). The cross section rises smoothly as expected for a direct capture process: at Eα = 1.32 MeV, σ = 3.58 ± 0.06 μb and the corresponding reduced cross section factor S = 0.064 ± 0.016 keV · b (1961GR27). Cross sections of (1961GR27) are 2 to 2.5 times higher than those of (1959HO03). See (1966LA04) for further comments and (1972BA77, 1972HA06, 1972SM0 2).

2. 3H(α, n)6Li Qm = -4.784 Eb = 2.4668

The cross section for this reaction has been measured for Eα = 11 to 18 MeV: the data show the effect of 7Li*(7.47) and indicate a broad resonance near Eα = 16.8 MeV [7Li*(9.6)]. The level parameters derived from this reaction and from reaction 3 (1967SP10) are displayed in Table 7.2 (in PDF or PS). See also (1972BA26; theor.).

3. 3H(α, α)3H Eb = 2.4668

The elastic scattering has been studied for Eα = 3.6 to 18.2 MeV. The excitation curves show the effects of 7Li*(4.63, 6.68, 7.47, 9.61). The derived level parameters are displayed in Table 7.2 (in PDF or PS). Polarization parameters are calculated (1967SP10, 1968IV01). Polarization measurements are reported for Et = 6.0 to 12.3 MeV (1968KE03, 1971AR1K) and angular distributions have also been measured for Eα = 2.13 to 2.98 MeV (1971CH42). See also (1970LI06) and (1968BR1H, 1971KU22, 1972BB26, 1972CL1C, 1972NE17, 1973KO1Q; theor).

4. 4He(α, p)7Li Qm = -17.348

See (1958BU38).

5. 6He(p, t)4He Qm = 7.511 Eb = 9.978

See (1971PO1A).

6. 6Li(n, γ)7Li Qm = 7.2506
Q0 = 7250.0 ± 0.5 keV (1968SP01);
Q0 = 7250.3 ± 0.9 keV (1972OP01);
Q0 = 7251.0 ± 1.0 keV (1967RA24);
Q0 = 7250.6 ± 1.5 keV (E.T. Jurney, private communication).

The total radiative capture cross section for thermal neutrons is 38.5 ± 3.0 mb (E.T. Jurney, private communication). Two γ-rays with Eγ = 7247 ± 2 and 6769 ± 2 keV are observed corresponding to transitions to 7Li*(0, 0.48) with branching ratios of 61 ± 3 and 39 ± 2%, respectively. Gamma rays with Eγ = 4.63, 4.15 and 2.62 MeV corresponding to the decays of, and the transition to, 7Li*(4.63) are not observed: upper limits ar 2, 2 and 6%, respectively (1967TH05), 1% (E.T. Jurney, private communication). See also (1968SP01). For astrophysical implications of this reaction see (1968FO1A).


Eγ = 477.6 ± 0.5, 6770.4 ± 1.5 and 7246.6 ± 1.5 keV, and the branching ratios are 61 ± 1 and 39 ± 1% to the ground state and to Ex = 477.6 ± 0.5 keV (E.T. Jurney, private communication).

7. 6Li(n, n)6Li Eb = 7.2506

The total cross section has been measured for En = 4 eV to 29 MeV: see (1960HU1A, 1964ST25, 1966LA04). Recent measurements have been carried out at En = 10 to 1236 keV (1968HI1E), 50 to 650 keV (1968FA1D), 100 to 1500 keV (1972ME17), 0.7 to 30 MeV (1973GO2B, and C.A. Goulding, private communication) and 2.5 to 15 MeV (1971FO1A). A pronounced resonance occurs at En = 255 keV with a peak cross section of about 11.0 b (1972ME17, 1960HU1A, 1968HI1E). See also (1968FA1D). The elastic contribution is 7.2 b (1961LA1A). No other clearly defined resonance is observed although the total cross section exhibits its a broad maximum at En ≈ 5 MeV (1954JO17, 1960HU1A). The coherent scattering length (thermal, bound) is 1.8 + 0.25i fm (1969BA1P, 1973MU14).

Angular distributions are tabulated by (1970GA1A) and in reaction 11 of 6Li. All observations near the 255 keV resonance are consistent with p-wave formation of a Jπ = 5/2- level [7Li*(7.47)]. Table 7.3 (in PDF or PS) gives the resonance parameters compared with those for 7Be*(7.18). These states are believed to have a 4P5/2 character, in agreement with their large θ2n and θ2p (1959GA08, 1963MC09).

The excitation function for 3.56 MeV γ-rays exhibits an anomaly, also seen in the (n, p) reaction [reaction 6]. The data are well fitted assuming Eres = 3.50 and 4.60 MeV [Ex = 10.25 ± 0.10 and 11.19 ± 0.05 MeV]. T = 1/2 and 3/2, Γcm = 1.40 ± 0.10 and 0.27 ± 0.05 MeV, respectively. Both states have Jπ = 3/2-. The reduced widths for the T = 3/2 state [7Li*(11.19)] are θ2n = 2 × 10-4, θ2n'' = 0.16 [to 6Li*(3.56)] and θ2p = 0.09 (1969PR04). Cross-section measurements are also reported at En = 1 to 100 keV (1970AS1E), 4.8, 5.7 and 7.5 MeV (1968HO03), 10 MeV (1967CO01) and 14 MeV (1966ME1C). See also (1966AG1A, 1971RE07, 1973LA26; theor.).

Polarization measurements are reported at En = 3.4 MeV (1968WO1F) and at 4.4 MeV (1966ST09). See also (1967BE1F; theor.) and (1966LA04) for earlier measurements.

8. 6Li(n, p)6He Qm = -2.727 Eb = 7.2506

The excitation function, measured from threshold to En = 8.9 MeV, exhibits an anomaly at En = 4.6 MeV: see reaction 6 (1969PR04).

See also (1966JE1B, 1971CU1B, 1971PR09, 1972ED01, 1973BO1Y).

9. 6Li(n, d)5He Qm = -2.36 Eb = 7.2506

See (1969LI1F, 1973BO1Y) and (1966LA04).

10. 6Li(n, 2n)5Li Qm = -5.66 Eb = 7.2506

See (1963AS01).

11. 6Li(n, α)3H Qm = 4.7839 Eb = 7.2506
Q0 = 4.794 ± 0.012 (1967DE15).

Excitation functions and angular distributions are summarized in (1960HU1A, 1964ST25, 1966LA04, 1970GA1A). More recent cross-section measurements are reported by (1967CO1N: En = 10.7 to 102 keV), (1966BA1V: 25, 67 and 100 keV), (1970FO1E: 81.8 to 517 keV) [see below for thermal measurements]. Recent angular distributions are given in (1971OV1A: 0.10 to 1.80 MeV) and in (1966RO1L: 0.25, 0.39 and 0.60 MeV).

The isotropic thermal cross section is 938 ± 6 b (1970ME1F), 940 ± 4 b (1970SO1A) [the value listed in (1966LA04) is in error: it should have been 945 b]. Below 5 keV, the total cross section is given by σ = (149.5/√E (square root of E)(eV))+0.696 b (1970SO1A). (1970SO1A) have also measured the ratio of (n, α) cross sections for 6Li and 10B in the range En = 10 eV to 80 keV.

A resonance occurs at En = 258 keV, with σmax = 2.75 b (1959BA46), 2.80 ± 0.22 b (1959GA08). The resonance is formed by p-waves, Jπ = 5/2-, and has a large neutron width and a small α-width: see Table 7.3 (in PDF or PS) (1959GA08). Above the resonance the cross section decreases monotonically to En = 18 MeV, except for a slight bump near En = 1.6 to 2.1 MeV (1959GA08, 1959MU25). See also (1970MC1A, 1971MA1Y, 1972ZV1A, 1973BO1Y, 1974BA1K), (1966JE1B, 1968GI1D, 1970DE1H) and (1966BL1C, 1966MA1L, 1968FA1D, 1968SE1A, 1972LA1F). For astrophysical implications, see (1964FO1A, 1965BU1C).

12. (a) 6Li(d, p)7Li Qm = 5.0260
(b) 6Li(d, np)6Li Qm = -2.22464
Q0 = 5.024 ± 0.007 (1967SP09).

Angular distribution measurements have been recently carried out at Ed = 1 to 2 MeV (1966BR25; p0, p1), 1.48 to 2.94 MeV (1968TU1A; p0, p1), 1.5 MeV (1965RI09; p0, p1, p2), 2.9 MeV (1966RO1J; p0, p1), 4.5 to 5.5 MeV (1970PO03; p0, p1) and 12 MeV (1967SC29; p0, p1). See also (1969HO39, 1969VI06) and (1966LA04) for earlier references. The p0 and the p1 [Ex = 477 ± 2 keV (1959AJ76)] groups show stripping patterns with ln = 1. The p2 [Ex = 4.630 ± 0.009 MeV, Γcm = 93 ± 8 keV (1966LA04)] angular distribution is isotropic (1960HA14). In addition the excitation of 7Li*(7.47) with Ex = 7.464 ± 0.010 MeV, Γcm = 91 ± 8 keV, is also reported (1957BR97). See also (1966LA04). Ratios of observed θ2n [see Table 7.3 (in PDF or PS) in (1966LA04)] are consistent with assignments 22P to 7Li*(0, 0.48) and 24P to 7Li*(7.47) (1960HA14, 1960MA32). At Ed = 12 MeV spectroscopic factors for 7Li*(0, 0.48) [S = 0.90, 1.15] derived by DWBA are in good accord with the shell model calculations of (1967CO32, 1967SC29). The angular correlation between p1 and the 0.48 MeV γ-rays is isotropic (1959AJ76): 7Li*(0.48) has Jπ = 1/2.

Using vector polarized deuterons with Ed = 10 MeV, (1970FI07) determined the probabilities pj for transfer of a neutron with total angular momentum j. The results are in quite good agreement with the shell-model calculations of (1965CO25, 1967CO32). The circular polarization of the 0.48 MeV γ-rays has been determined by (1966SC1E). See also 8Be (1966AU1A, 1966BE1E, 1968BE1P, 1969LE22) and (1967OG1A).

A kinematically complete study of reaction (b) at Ed = 10 MeV shows pronounced final state interactions vua 7Li*(7.47) and possibly 7Li*(9.6) [Γ = 0.5 ± 0.1 MeV] (1971VO07). See also 8Be.

13. 6Li(t, d)7Li Qm = 0.9930

See (1954AL35, 1961HO21, 1967BI1E).

14. 6Li(α, 3He)7Li Qm = -13.3279

Not reported.

15. (a) 6Li(6Li, pα)7Li Qm = 3.552
(b) 6Li(9Be, 8Be)7Li Qm = 5.586

See (1966LA04), 12C in (1968AJ02) and 15N in (1970AJ04).

16. 7Li(γ, γ)7Li

For a listing of lifetime measurements of 7Li*(0.48), see Table 7.4 (in PDF or PS) in (1966LA04): τm = 0.107 ± 0.005 psec.

17. (a) 7Li(γ, n)6Li Qm = -7.2506
(b) 7Li(γ, 2n)5Li Qm = -12.91
(c) 7Li(γ, p)6He Qm = -9.978
(d) 7Li(γ, pn)5He Qm = -11.84
(e) 7Li(γ, d)5He Qm = -9.61
(f) 7Li(γ, t)4He Qm = -2.4668

Reports on the structure of the (γ, n) cross section [reaction (a)] differ widely. The total photoneutron cross section rises sharply from 10 MeV to reach a broad plateau of about 1.5 mb from 14 to 20 MeV, decreases more slowly to about 0.5 mb at 25 MeV and then remains approximately constant to 30 MeV. There are indications of weak structure through the entire region particularly at Eγ = 7.5 and 10.5 MeV (1973BR1M; monoenergetic photons). See also (1954GO1A, 1958RY77, 1966BR1M). There are many reports of fine structure [see Table 7.5 (in PDF or PS) in (1966LA04) and (1965HA19, 1965WA19, 1966BA1W)]. See also (1970HA1F) and (1968KA1D, 1968RA1E, 1969MU1C). The integrated cross sections from threshold to 32 MeV are 20 MeV · mb and 10 MeV · mb for the total neutron yield and for reaction (b), respectively (1966BR1M). See also (1971KA70, 1973AH1A).

The cross section for the (γ, p) reaction (reaction (c)) shows a maximum at ≈ 15.6 MeV with a width of ≈ 4 MeV (1954TI16, 1962GR08) [however a number of authors claim the existence of many additional peaks: see (1966LA04)]. The energy distribution of the photoprotons has been measured with bremsstrahlung radiation Ebs = 50 to 34 MeV (1970SA14) and 100 MeV (1968MA19) and at Eγ = 60 MeV (1973GA16). The polarization of the protons produced in the interaction between high-energy γ-rays and 7Li has been studied by (1969AN20, 1970TO09). See also 6He and (1966MA17, 1967DE11, 1969AN1H, 1969MU1C, 1970AN05, 1970WO10, 1971AN04, 1973DO13) and (1970HA1F).

For reaction (d) see (1967SM1A). For reaction (e) see (1967DE11, 1969AN1H, 1971AN04, 1972AN1L). A number of peaks have been reported in the (γ, t) cross section: see Table 7.5 (in PDF or PS) in (1966LA04) and (1970SE1D). See also (1965DA06, 1966DZ07, 1966MA17, 1967DE11, 1969HU1E, 1970DE1Q, 1970SE1A). See also (1967SH1E, 1973AR1L, 1973CO1N) and (1968EL06, 1970RA1H, 1973AS02; theor.).

18. (a) 7Li(e, e')7Li*
(b) 7Li(e, ep)6He Qm = -9.978

The electric form factor measurements for Ee = 100 to 600 MeV are well accounted for by a simple harmonic oscillator shell model with a quadrupole contribution described by an undeformed p-shell: Rrms = 2.39 ± 0.03 fm, |Q| = 42 ± 2.5 mb (1967SU1A). From results obtained for Ee = 24.14 to 97.19 MeV, Rrms = 2.35 ± 0.10 fm (model independent), 2.29 ± 0.04 fm (shell model) (1969MO1J, 1972BU01). A study of the ratio of the electric charge scattering from 6Li and from 7Li as a function of (momentum transfer)2 yields < r2 > 1/26/ < r2 > 1/27 = 1.001 ± 0.008. The r.m.s. radius of the ground-state magnetization density distribution, < r2 > 1/2M = 2.98 ± 0.05 fm. From the ratio of the transverse inelastic and elastic cross sections at 180°, B(M1,↑; 0.48) = 2.50 ± 0.12 μ2N. The cross section of the longitudinal excitation of 7Li*(0.48) has been found from the scattering through angles of 90° to 150°, B(C2,↑; 0.48) = 7 ± 4 fm4. The harmonic oscillator length parameter of the 1p shell is found to be a1p = 1.90 ± 0.03 fm (1971VA20).

The magnetic form factor has been measured for Ee = 70 to 200 MeV. The ratio of the magnetic octupole moment to the dipole moment Ω/μ = 2.30 ± 0.50 fm2 (1966RA29).

Inelastic scattering studies show peaks corresponding to 7Li*(0 + 0.48, 4.63, 6.68, 7.47, 11.25): see (1967AR1A, 1968HU1C, 1969HU05), (1966LA04) and Table 7.4 (in PDF or PS). See also the review by (1972THZF). For reaction (b) see (1970WO10).

See also (1970WA1N), (1966GO1C, 1966GU1C, 1968GO1J) and (1966MU1A, 1967BO22, 1967EL1B, 1967KA1A, 1968BO1R, 1968KU1D, 1968KU1B, 1969HA1N, 1969KR16, 1969KU1C, 1969VI02, 1969WI21, 1972DR1B, 1973HI03; theor.).

19. (a) 7Li(n, n')7Li
(b) 7Li(n, nt)4He Qm = -2.4668

Angular distributions have recently been measured at En = 1.12 to 2.30 MeV (1968KN1B; n0, n1), 3.35 and 4.83 MeV (1968HO03; n0), 5.74 and 7.50 MeV (1968HO03; n0 + n1) and 14 MeV (1966RE1B; n0 + n1, n2). See (1966LA04) for a listing of earlier references and (1970GA1A). At En = 14 MeV no states other than 7Li*(0, 0.48, 4.63) are populated (1968HA1J): see, however, (1954AL24, 1966RE1B). See also (1966HU1B, 1967CO01) and (1969WA11; theor.). See also 8Li. For reaction (b) see (1972AN1Q) and 5He.

20. 7Li(p, p')7Li*

Angular distributions are reported at Ep = 1.0 to 2.0 MeV (1966BA1Q; p0, p1), 24.4 MeV (1967CR1E; p0, p1, p2), 33.6 MeV (1970KU1D; p0), 49.8 MeV (1971MA13, 1971MA44; p0, p1, p2), 100 MeV (1966MA38, 1968LI1C; p0 + p1, p2), 144 MeV (1972JA07; p0), 152 MeV (1966RO1C; p0), 155 MeV (1968GE04; p0, p1, p2) and 185 MeV (1967JO1F; p1). (1967CR1E) report that the p2 group is strongly excited and that the angular distribution is consistent with the predictions of the collective model for an l = 2 transition. Earlier measurements are reported in (1966LA04).

Inelastic proton groups have been observed corresponding to 7Li*(0.48, 4.63, 6.68, 7.47): see (1952AJ38). At Ep = 185 MeV proton groups are observed to these states [Ex = 4.62 ± 0.04, 6.55 ± 0.20, 7.5 ± 0.2 MeV: (1967JO1F)] as well as to states at Ex = 5.5 ± 0.3 MeV (Γ ≈ 0.4 MeV) (1965HA17: not seen by (1967JO1F)) and 9.6 ± 0.2 MeV (1965HA17), 9.4 ± 0.2 MeV (1967JO1F). The width of 7Li*(6.7) is ≈ 1 MeV (1965HA17). At Ep = 50 MeV (1968MA02) report ten states of 7Li with Ex < 13.6 MeV.

τm(0.48) = 0.106 ± 0.014 psec (1966PA11: Doppler shift measurement), a value consistent with intermediate coupling with LS coupling predominating (a/K < 3.6): see also Table 7.4 (in PDF or PS) in (1966LA04). Analysis of the 155 MeV data yields B(E2↑) = 10.5 ± 2, 28 ± 6 and 4.5 ± 2.3 fm4 for 7Li*(0.48, 4.63, 6.68); Γ(E2↓) = 0.43, 0.025 and 0.029 μeV (1965JA1A).

A comparison of σt for 7Li(p, p')7Li*(0.48) and 7Li(p, n)7Be*(0.43) has been carried out for Ep = 23 to 52 MeV: the spin-flip, isospin-flip part of the effective interaction is approximately independent of energy while the pure central part appears to decrease with increasing energy (1967LO07). See also (1966MA1N, 1968GL1A, 1968NE1B, 1969MA1P, 1969NE1A, 1969TI02, 1969WA11, 1970KI1E, 1973KA04; theor.).

21. (a) 7Li(p, 2p)6He Qm = -9.978
(b) 7Li(p, pn)6Li Qm = -7.2506
(c) 7Li(p, pd)5He Qm = -9.61
(d) 7Li(p, pα)3H Qm = -2.4668
(e) 7Li(p, α)4He Qm = 17.348
(f) 7Li(p, 2d)4He Qm = -6.500

For reaction (a) see 6He. See also (1966LA04), (1973CO2B) and (1965BE1E, 1966JA1A, 1967EL1C, 1967JA1E, 1968JA1G, 1969KO1J; theor.). For reaction (b) see (1970TH1F). For reaction (c) see reaction 20 in 6Li and (1973CO2B, 1973KO1M). The momentum distribution of the α-particles in reaction (d) has the shape expected for the knockout of an L = 1 α-cluster from 7Li (1970JA17). The reaction proceeds sequentially via 7Li*(4.63) (1967JO1C, 1970JA17) and via 7Li*(6.68) (1970JA17). See also (1969HO1K, 1971GA1J, 1973CO2B), (1972RA1E) and (1972JA23; theor.). For reaction (e) see 8Be. For reaction (f) see (1972FU07, 1973CO2B) and reaction 20 in 6Li.

22. 7Li(d, d')7Li*

Angular distributions have been measured at Ed = 11.8 MeV (1968LU02; d0, d1), 12 MeV (1971BI11; d0), 14.7 MeV (1969MA13; d0, d1, d2) and 28 MeV (1962SL02; d0, d2). See also (1970EL16; theor.) and (1966LA04).

23. 7Li(3He, 3He')7Li*

Angular distributions are reported at E(3He) = 8.7 and 9.7 MeV (1969MA1J; elastic), 11 MeV (1970SC23; elastic), 21, 24 and 27 MeV (1966VA1B, 1967BL1E: to 7Li*(0, 0.48, 4.63)) and 25.2 MeV (1968BR1G: to 7Li*(0, 0.48, 4.63). See also (1967CO1J).

24. (a) 7Li(α, α')7Li*
(b) 7Li(α, 2α)3H Qm = -2.4668

Angular distributions (reaction (a)) are reported at Eα = 3.6 MeV (1972BO07; α0, α1), 12.0 to 18.0 MeV (1970BI1B, 1971BI12; α0), 25 MeV (1969DO1H; α0 + α1, α2) and 29.4 MeV (1968MA25, 1969MA13; α0, α1, α2). See also (1972BE1Z).

Reaction (b) has been studied at Eα = 23.6 MeV (1968BE1Q), 25 MeV (1969DO02, 1969DO03, 1969DO1H), 29.4 MeV (1968MA25), 50 MeV (1970LA14, 1973LA1Q), 55 MeV (1968PI04, 1969PI11, 1970PI1D), 64.3 MeV (1970JA17) and 104 MeV (1969VE1B). 7Li*(4.63) is strongly involved in the sequential decay: see (1968MA25, 1969DO1H, 1970JA17, 1970LA14). The population of 7Li*(7.48) is reported by (1970LA14), and (1968MA25) suggests that 7Li*(6.68) is also involved in the sequential decay. At Eα = 55 MeV, the effective number of α clusters, Neff = 4+4-2% (1969PI11). See also (1969BA2C), (1969HO1K, 1971GA1J) and (1968BA1H, 1972AV04; theor.). See also (1966LA04).

25. 7Li(7Li, 7Li)7Li

The elastic angular distribution has been studied for E(7Li) = 4.0 to 6.5 MeV (1966PI02).

26. 7Li(10B, 10B)7Li

See (1969RO1G) and 10B.

27. (a) 7Li(12C, 12C)7Li
(b) 7Li(13C, 13C)7Li

The elastic scattering has been studied at E(7Li) = 20 MeV (1969BE90) [on 13C] and at 34 [13C] and 36 [12C] MeV (1973SC26). See also 12C in (1975AJ02) and 13C in (1976AJ04). The inelastic scattering angular distributions involving 7Li*0.48 + 12Cg.s. and 7Li*0.48 + 12C*4.43 have been measured at E(7Li) = 36 MeV (1973SC26).

28. 7Li(16O, 16O)7Li

See (1969BE90, 1971OR02).

29. 7Li(20Ne, 20Ne')7Li*

See (1966LA04).

30. 7Be(ε)7Li Qm = 0.862
Q0 = 0.851 ± 0.012 (1973MU19).

The decay proceeds to the ground and 0.48 MeV states. The branching ratio to 7Li*(0.48) is 10.32 ± 0.16% (1962TA11), 10.4 ± 0.3% (1972SZ02), 10.42 ± 0.18% (1973PO10). [See also Table 7.8 (in PDF or PS) in (1966LA04)]. The weighted mean value of the half-life is 53.44 ± 0.09 days (1949SE20, 1953KR16, 1956BO36, 1970JO21). Both transitions are superallowed. Log ft = 3.30 and 3.54 for the decays to 7Li*(0, 0.48) respectively.


G. Fox and B. Zimmerman, private communication.
The energy of the γ-ray is 477.57 ± 0.05 keV (1967BL03), 477.4 ± 0.2 keV (1965RO09), 477.593 ± 0.012 keV (1971HE20) [Ex = 477.611 ± 0.012 keV]. A measurement of the bremsstrahlung spectrum to 7Li*(0.48) measured in coincidence with the 478 keV γ-ray, leads to a transition energy of 395 ± 25 keV (1971LA03), 388 ± 8 keV (1972PE05). See also (1973MU19).

For discussions of astrophysical considerations, see (1969BA1U, 1969FO1D, 1969YI1B, 1971CA1B, 1972BA2M, 1972KO1A, 1973BA2C). See also (1967GE1A, 1969HE1M, 1973HE1M), (1972EM03) and (1965PR04, 1966EL08, 1966BA26, 1968FI02, 1969LE1D, 1969SU15, 1970DA21, 1970FA14, 1970KO41, 1973HA49, 1973MU12, 1973WI11; theor.).

31. 9Be(γ, d)7Li Qm = -16.6965

See 9Be and (1955AJ61).

32. 9Be(n, t)7Li Qm = -10.4389

See 10Be and (1966LA04).

33. 9Be(p, 3He)7Li Qm = -11.2027

At Ep = 43.7 angular distributions have been obtained for the 3He particles corresponding to 7Li*(0, 0.48, 4.63, 7.47). The 7.47 MeV state is strongly excited while the mirror state in 7Be is not appreciably populated in the mirror reaction (see reaction 17 in 7Be). The angular distribution indicates that the transition to 7Li*(7.47) involves both L = 0 and 2, with a somewhat dominant L = 0 character (1966CE05). Reanalysis of the data of (1965DE08) places the Jπ = 3/2-; T = 3/2 level at Ex = 11.28 ± 0.04 MeV, Γ = 260 ± 50 keV (1967MC14). See also (1969BA1Z, 1969IN1A).

34. 9Be(p, pd)7Li Qm = 16.6965

See (1966LA04).

35. (a) 9Be(d, α)7Li Qm = 7.1511
(b) 9Be(d, t)4He4He Qm = 4.684
Q0 = 7.157 ± 0.008 (1967SP09).

Angular distributions have been measured recently at Ed = 0.3 to 1.0 MeV (1968BE1E; α0, α1), 0.9 to 2.2 MeV (1971SA27; α0, α1), 11.4 and 12.4 MeV (1966DO1A; α0, α1). For older measurements see (1966LA04). A study at Ed = 11 MeV finds Γcm = 93 ± 25 and 80 ± 20 keV, respectively, for 7Li*(4.63, 7.47). No evidence was observed for 7Li*(5.5, 8.6, 9.7, 12.5) or for the T = 3/2 state 7Li*(11.25) (1966HA09). See also (1964MA57, 1966JA05) and (1966ME1E; theor.). In a kinematically complete study of reaction (b) at Ed = 26.3 MeV, 7Li*(4.6, 6.5 + 7.5, 9.4) are strongly excited. No sharp α-decaying states of 7Li are observed with 10 < Ex < 25 MeV. Parameters for 7Li*(9.6) are Ex = 9.36 ± 0.05 MeV, Γ = 0.8 ± 0.2 MeV (1973SO08). See also 8Be.

36. 9Be(3He, αp)7Li Qm = 1.657

See (1967ST1D).

37. 9Be(6Li, 2α)7Li Qm = 5.677

See (1966SA04, 1968JA08) and 11B in (1975AJ02).

38. (a) 10B(n, α)7Li Qm = 2.791
(b) 10B(n, t)4He4He Qm = 0.3237
Q0 = 2.8008 ± 0.0076 (1967DE15).

At En = 14.4 MeV angular distributions have been measured for the n0 + n1 and for the n2 groups (1969AN25). The half-life of 7Li*(0.48) is 92 ± 11 fsec (1967CA02). See also (1966LA04), 11B in (1975AJ02), (1969VA1F, 1970NE03, 1972SE1K) and (1972HA04; theor.). For reaction (b) see (1967VA12).

39. 10B(α, 7Be)7Li Qm = -16.202

See reaction 19 in 7Be (1969FO06).

40. 11B(γ, α)7Li Qm = -8.666

See 11B in (1975AJ02) and (1969MU10).

41. 11B(p, pα)7Li Qm = -8.666

See (1964BA1C).

42. (a) 11B(α, 2α)7Li Qm = -8.666
(b) 11B(α, 8Be)7Li Qm = -8.758

For reaction (a) see (1966GE12, 1969FU09). Angular distributions have been measured in reaction (b) at Eα = 28.4 and 29.0 MeV for the transitions to 8Be*(0, 2.9) and 7Li*(0, 0.48) (1968KA24). At Eα = 65 MeV 7Li*(0, 4.63) are strongly populated and 7Li*(7.47) is weakly excited. The intensity of the group to 7Li*(0.48) is < 15% of the group to 7Li(0) (1973WO06). See also (1966GE12).

43. 11B(d, 6Li)7Li Qm = -7.192

At Ed = 19.5 MeV, angular distributions have been measured for the transitions to 6Li(0) and 7Li*(0, 0.48) (1971GU07). At Ed = 40 MeV the cross section for the transition to 6Li*(3.56) + 7Li(0) is half that for 6He(0) + 7Be(0) [to ± 10%] in agreement with isospin conservation (1972GO1P). See also (1972GA1E).

44. 11B(16O, 20Ne)7Li Qm = -3.936

See (1968OK06).

45. 12C(d, 7Be)7Li Qm = -17.543

At Ed = 39.8 MeV, angular distributions have been measured for the transitions to 7Li(0) + 7Be(0), 7Li*(0.48) + 7Be(0), 7Li(0) + 7Be*(0.43), and 7Li*(0.48) + 7Be*(0.43). Asymmetries exceeding 20% are observed in the ratio of the cross sections to 7Li(0) and 7Be(0) (1971HO1K, 1971YO06). See also (1971SI28; theor.).

46. 12C(3He, 8B)7Li Qm = -22.899

This reaction has been studied at E(3He) = 40.7 MeV (1971DE37).

47. 12C(6Li, 11C)7Li Qm = -11.471

At E(6Li) = 36 MeV, angular distributions have been obtained for the transitions involving 7Lig.s. + 11Cg.s. and 7Li*0.48 + 11Cg.s. (1973SC26).

48. 13C(p, 7Be)7Li Qm = -20.264

At Ep = 45.0 MeV angular distribution has been measured for the transition to 7Be(0) + 7Li(0) (1971BR07).

49. 13C(d, 8Be)7Li Qm = -3.589

At Ed = 14.6 MeV, angular distributions are reported for the transitions to 8Be(0) and 7Li*(0, 0.48) (1967DE03).

50. 13C(6Li, 12C)7Li Qm = 2.304

At E(6Li) = 34 MeV angular distributions have been measured for the transitions involving 7Lig.s. + 12Cg.s., 7Li*0.48 + 12Cg.s., 7Lig.s. + 12C*4.4, and 7Li*0.48 + 12C*4.4 (1973SC26).

51. 14N(n, 2α)7Li Qm = -8.823

At En = 14.1 MeV, 7Li*(0, 0.48) are produced with about equal probability (1971SC16).

52. 16O(α, 13N)7Li Qm = -22.566

See (1972RU03).

53. 16O(6Li, 15O)7Li Qm = -8.419

At E(6Li) = 36 MeV, angular distributions have been determined for the transitions involving 7Lig.s. + 15Og.s. and 7Li*0.48 + 15Og.s. (1973SC26).

54. (a) 17O(d, 12C)7Li Qm = -2.580
(b) 18O(d, 13C)7Li Qm = -5.680
(c) 19F(d, 14N)7Li Qm = -6.122

At Ed = 14.6 to 15.0 MeV, angular distributions have been measured for the transitions to 12C(0) + 7Li*(0, 0.48) [reaction (a)], 13C(0) + 7Li*(0, 0.48) [reaction (b)] and 14N(0) + 7Li*(0, 0.48) [reaction (c)] (1967DE03).