
^{7}Li (1988AJ01)(See Energy Level Diagrams for ^{7}Li) GENERAL: See also (1984AJ01) and Table 7.2 [Table of Energy Levels] (in PDF or PS) here. Shell model: (1983BU1B, 1983KU17, 1983SH1D, 1983VA31, 1984CH24, 1984REZZ, 1984VA06, 1984ZW1A, 1985FI1E, 1985GO11, 1986AV08, 1987KA09, 1987KI1C, 1988WO04). Cluster and αparticle models: (1981PL1A, 1983FU1D, 1983HO22, 1983PA06, 1983SH1D, 1983SR1C, 1984BA53, 1984DA07, 1984DU13, 1984DU17, 1984JO1A, 1984KA06, 1984KA04, 1984LO09, 1984MI1F, 1984SH26, 1985FI1E, 1985FU01, 1985FU11, 1985KW02, 1985WA17, 1986AV08, 1986FA11, 1986FI07, 1986KR12, 1986SA15, 1986SA1D, 1986VA13, 1987BA1I, 1987IM04, 1987KA09, 1987LE33, 1987TA06, 1987ZH1E, 1988US1A). Special states: (1981PL1A, 1982PO12, 1983BU1B, 1983FI11, 1983HO22, 1983KU17, 1983VA31, 1984DU13, 1984DU17, 1984FI20, 1984OH01, 1984REZZ, 1984VA06, 1984VAZS, 1984ZW1A, 1985BA68, 1985FI1E, 1985GO11, 1985GO1A, 1986BA2J, 1986FI07, 1986SA15, 1986VA13, 1987KI1C, 1987SV1A, 1987WA36, 1987ZH1E, 1988KW02, 1988US1A, 1988ZH1B). Electromagnetic transitions, giant resonances: (1983FI11, 1983GM1A, 1983KU17, 1984CH24, 1984DU17, 1984KA06, 1984KA04, 1984MO1D, 1984SH26, 1985FI1E, 1985GO23, 1985GO1A, 1985WA17, 1986ER1A, 1986FI07, 1986ME13, 1986VA13, 1987AR1E, 1987KI1C, 1987LE33, 1987ZH1E). Astrophysical questions: (1982AU1A, 1982CA1A, 1982GR1A, 1982WA1B, 1983SI1B, 1983WA1H, 1984RA1E, 1984TR1C, 1984YA1A, 1985BO1E, 1985BO1K, 1985DE1E, 1985DE1K, 1985GI1C, 1985HO1A, 1985MI1E, 1985SC1C, 1985SC1D, 1985WA1K, 1986BO1H, 1986MA1U, 1986ME13, 1986PA1H, 1986RE1C, 1986RO1P, 1986SA1G, 1986SH1G, 1986SP1A, 1986WI1D, 1987AR1J, 1987AR1C, 1987AU1E, 1987CO1X, 1987DO1H, 1987DU1C, 1987FO1B, 1987HO1M, 1987KA1R, 1987KA1V, 1987MAZC, 1987MA2C, 1987PA1F, 1987RA1D, 1987RE1F, 1987RO25, 1987SP1C, 1987SP1D, 1988BA86, 1988KAZY, 1988KA07, 1988KA1H, 1988MEZS, 1988RE1B). Complex reactions involving ^{7}Li: (1982GU21, 1983CH23, 1983EF1A, 1983GU1A, 1983GU1B, 1983KH04, 1983KU1B, 1983LE1F, 1983MA53, 1983MU08, 1983NA08, 1983OL1A, 1983SI1A, 1983SO08, 1983ST1A, 1983UT01, 1984AI1A, 1984BE1E, 1984DA07, 1984EC01, 1984GR08, 1984HI1A, 1984IS02, 1984MO29, 1984RE14, 1984SH17, 1984SI15, 1984ST1B, 1984XI1B, 1985AG1A, 1985BH02, 1985FA02, 1985GL06, 1985GO20, 1985KI1C, 1985MA02, 1985MA13, 1985MC03, 1985MO17, 1985MO24, 1985SH1G, 1985WA1F, 1985WA22, 1985WO11, 1986AV1A, 1986BL12, 1986DAZP, 1986GL1E, 1986GO1F, 1986HA1B, 1986JO1A, 1986KA1C, 1986KA1G, 1986KO1L, 1986ME06, 1986MO1E, 1986NAZV, 1986RE13, 1986SAZL, 1986SA30, 1986SA1N, 1986SHZO, 1986SH1F, 1986SIZS, 1986SO10, 1986TA1F, 1986TA1G, 1986TA1M, 1986TU1A, 1986TU01, 1986WA1H, 1986WE1C, 1986YA1L, 1987AK1A, 1987AU1C, 1987BA38, 1987BE58, 1987BL13, 1987CH26, 1987COZZ, 1987DE37, 1987DO02, 1987FA02, 1987FE1A, 1987GL05, 1987GO17, 1987GR11, 1987HE1H, 1987JA06, 1987KI05, 1987KIZY, 1987MU03, 1987MU1D, 1987NA01, 1987NI04, 1987PO23, 1987SA04, 1987SH23, 1987SI1C, 1987SO13, 1987SO15, 1987ST01, 1987TAZU, 1987TE1D, 1987TR05, 1987WA09, 1987YA16, 1988BL09, 1988CA06, 1988CEZZ, 1988GO1H, 1988KA1L, 1988KI05, 1988KW02, 1988RU01, 1988SA19, 1988SH1E, 1988SH20, 1988ST06, 1988TA1A, 1988VA1E). Polarization of ^{7}Li: (1983HA1H, 1984JO1A, 1984NI01, 1985TU1A, 1985WE08, 1986CH1Q, 1986FR03, 1986ME13, 1986NO1C, 1986SA15, 1986ST1E, 1986TA1G, 1986TU01, 1987AR1E, 1987FI1D, 1987KA1I, 1987KA1V, 1987MU04, 1987SA04, 1988GR07, 1988KA02). Applications: (1983AM1A, 1983AS03, 1983FI1C, 1983KU1C, 1984CA1D, 1984SA1E, 1984XI1A, 1985AD1B, 1985PA1A, 1986AU1A, 1986BE1J, 1986EN1A, 1986FI1D, 1986KL1B, 1986KR1C, 1986LI1J, 1986MA1S, 1986RA1D, 1986SA1M, 1986SC35, 1986ST1E, 1986ZA1C). Muon and neutrino capture and reactions: (1983GM1A, 1984RO1B, 1985MAZZ, 1985RU01, 1986MA16, 1987KU23, 1987SU06, 1988AL1H). Pion capture and reactions involving pions: (1982BA60, 1983AB1B, 1983AS1B, 1983AS1C, 1983BA26, 1983BA1A, 1983BA1G, 1983GE12, 1983GM1A, 1983HE17, 1983KA19, 1983PE14, 1983RA1D, 1983SE16, 1983SP06, 1984ABZY, 1984BA1T, 1984BA1U, 1984BO1H, 1984BU1D, 1984HU1C, 1984JI03, 1984ZA1A, 1985LA20, 1985IR01, 1985MO1F, 1986AN40, 1986AV08, 1986BA1C, 1986CE04, 1986CH1P, 1986DO01, 1986ER1A, 1986KA1J, 1986MO1J, 1986PA12, 1986PE05, 1986PR01, 1986RO03, 1986YO06, 1986ZO1A, 1987BA2F, 1987CH1D, 1987MA1I, 1987ROZY, 1988GIZU, 1988POZS). Reactions involving kaons and other mesons: (1983BA71, 1983FE07, 1983GE13, 1983GE1C, 1984BA1M, 1984BO1H, 1984CH1H, 1984MO09, 1985GA1C, 1985KN1A, 1985MO1F, 1986BA1W, 1986CH1P, 1986DO01, 1986GA1H, 1986GA33, 1986HU1B, 1986KA1J, 1986MA1C, 1986MO1J, 1986ZO1A, 1987CH1D, 1987KN09, 1987PO1H, 1988HA44). Reactions involving antiprotons: (1984GU06, 1985DU05, 1986DU10, 1986KO1E, 1986MO1J, 1987GR1I, 1987PO05). Hypernuclei: (1982KA1D, 1982MO1B, 1983BA1M, 1983FE07, 1983MA64, 1983MO1C, 1983SH38, 1983SH1E, 1984AS1D, 1984BA1M, 1984BO1H, 1984CH1G, 1984CH1H, 1984HA1D, 1984MI1C, 1984MI1E, 1984MO09, 1984MO1H, 1984SH1J, 1984ZH1B, 1985AH1A, 1985KN1A, 1985KO1G, 1985MO1F, 1986AN1R, 1986BA1W, 1986CH1P, 1986DA1B, 1986ER1A, 1986GA1H, 1986HU1B, 1986MA1C, 1986ME1F, 1986YA1F, 1987KN09, 1987MI38, 1987PO1H, 1987WA36, 1987YA1M, 1988TA29). Other topics: (1983FU1D, 1983PA06, 1983SH1D, 1984LO09, 1984OH01, 1985AN28, 1985GO23, 1985KA01, 1985TU1A, 1986DE1J, 1986GL1A, 1986GR1A, 1987AJ1A, 1987LE33, 1987SV1A, 1988BA1R, 1988FIZT, 1988GU1C, 1988KW02). Coulomb excitation of ^{7}Li: (1984SH17, 1984VE03, 1984VE08, 1986FA11). Groundstate properties of ^{7}Li: (1983ANZQ, 1983SR1C, 1983VA31, 1984AN1B, 1984CH24, 1984DU17, 1984GE05, 1984KA06, 1984MIZM, 1984NI01, 1984OH01, 1984PE12, 1984SH26, 1984VE03, 1985AN28, 1985BU02, 1985CL1A, 1985FI1E, 1985FU11, 1985GO1A, 1985HA18, 1985KL1B, 1985SA32, 1985WA17, 1986KO1U, 1986RO03, 1986SY1A, 1987AR1E, 1987HA30, 1987KA1U, 1987KA22, 1987KI1C, 1987SV1A, 1987TR1D, 1988JO1C, 1988KA02, 1988KA07, 1988POZS, 1988TA1D, 1988VA03, 1988WO04).
Q = 40.6 ± 0.8 mb (1988DI1B). See (1988DI1B) for a review of earlier determinations, particularly those of (1984SU09, 1984VE03, 1984VE08, 1985WE08). B(E2): 3/2^{} → 1/2^{} = 8.3 ± 0.5 e^{2} · fm^{4} (1985WE08). See also (1984VE08), (1988TA1D) and (1984AJ01). Isotopic abundance: (92.5 ± 0.2)% (1984DE53). See also (1987LA1J, 1988LA1C). The interaction nuclear radius of ^{7}Li is 2.23 ± 0.02 fm (1985TA18). [See also for derived nuclear matter, charge and neutron matter r.m.s. radii].
Excitation functions and angular distributions have been studied for E_{α} = 0.5 to 2.0 MeV. The cross section rises smoothly as expected for a direct capture process: see (1966LA04) and (1987BU18; γ_{0}, γ_{1}). S(E) and the branching ratio DC → 478 DC → 0 have been measured by (1987SC18): S(0) = 0.14 ± 0.02 keV · b, including earlier measurements. Using S(0) = 0.100 keV · b, (1987KA1R) predict BigBang production of ^{7}Li at all relevant densities and calculate the bounds on the mass density of the Universe from the observed ^{7}Li abundance. For other astrophysical calculations see (1984WA11, 1984YA1A, 1985CA41, 1985DE1K, 1985KA1H, 1985KA1K, 1986KA45, 1986LA22, 1986ME13, 1988KA02, 1988KAZY, 1988KA07, 1988KA1H). See also (1984NE1B; applied) and (1984KA01; theor.).
The cross section for this reaction has been measured for E_{α} = 11 to 18 MeV: the data show the effect of ^{7}Li*(7.46) and indicate a broad resonance near E_{α} = 16.8 MeV [^{7}Li*(9.6)]. The level parameters derived from this reaction and from reaction 3 are displayed in Table 7.3 (in PDF or PS). The yield of ^{6}Li ions at 0° (lab) has also been measured for E_{α} = 11.310 to 11.930 MeV with 2  3% accuracy: the data were then reduced to obtain the c.m. differential cross sections at 0° and 180° for the inverse reaction in the energy region corresponding to formation of ^{7}Li*(7.46): see (1979AJ01). See also (1985CA41; astrophys.).
The excitation curves for the elastic scattering show the effects of ^{7}Li*(4.63, 6.68, 7.46, 9.67). The derived level parameters are displayed in Table 7.3 (in PDF or PS). Angular distributions have been studied for E_{α} = 2.13 to 2.98 MeV and E_{pol. t} = 6.0 to 17 MeV [see (1979AJ01, 1984AJ01)] and at E_{α} = 56.3 to 95.5 MeV (1986YA1M; prelim.; also A_{y}]. A polarization extremum (A_{y} = 1) occurs near E_{t} = 11.1 MeV, θ = 95° : see (1984AJ01). For the breakup of ^{7}Li into α + t in various processes see (1984AJ01) and (1984SH17, 1987FO08, 1987PO03) as well as "Complex reactions" in the "General section" here. For cross section calculations from an Rmatrix calculation see (1987KN04). For muon catalysis see (1984KR1B). See also (1981PL1A, 1983FI09, 1983FU11, 1983FU19, 1983HAYX, 1983LO09, 1984DU13, 1984FI20, 1984FU04, 1984HO1C, 1984KA01, 1984KR10, 1984LO1C, 1985FU01, 1985FU11, 1985SH22, 1986BA2J, 1986BO01, 1986KA30, 1986SA1D, 1988FIZT; theor.).
^{7}Li*(0 + 0.48, 4.63) have been populated at E(^{3}He) = 266.5 and 280.5 MeV: see (1984AJ01). See also (1984GE05, 1987KA09; theor.).
Angular distributions have been reported at E_{α} = 39.9 to 140 MeV [see (1979AJ01, 1984AJ01)] and at 61.5 to 158.2 MeV (1982GL01) and 198.4 MeV (1985WO11) for the transitions to ^{7}Li*(0, 0.48). See (1982GL01, 1985WO11) for a discussion of ^{7}Li production in the Big Bang. See also ^{8}Be and (1986KA26; theor.).
The thermal capture cross section is 38.5 ± 3.0 mb (1981MUZQ). Gamma rays are observed corresponding to transitions to ^{7}Li*(0, 0.48) with branching ratios (62 ± 2) and (38 ± 2)% (1985KO47). ^{7}Li*(4.63, 6.68) are not populated [≤ 5%] (1985KO47). See (1979AJ01) for the earlier work. See also (1986AB1E). The decay of ^{7}Li*(7.46) → ^{6}Li_{g.s.} + n in the interaction of 35 MeV/A ^{14}N ions on Ag is reported by (1987BL13).
The real coherent scattering length is 2.0 ± 0.1 fm; the complex scattering lengths are b_{+} = (0.67 ± 0.14)  i(0.08 ± 0.01) fm, b_{} = (4.67 ± 0.17)  i(0.62 ± 0.02) fm; σ_{free} = 0.70 ± 0.01 b (1983KO17). See also (1979GL12). (1983AL1E) report σ_{s} (below 10 keV) = 0.72 ± 0.02 b. See also (1981MUZQ). The total cross section has been measured from E_{n} = 4 eV to 49.6 MeV [see (1976GAYV, 1984AJ01)], at 0.6 to 80 keV (1982AL35) and at 0.08 to 3.0 MeV (1983KN1D; prelim.). A pronounced resonance occurs at E_{n} = 244.5 ± 1.0 keV [E_{x} = 7459.5 ± 1.0 keV] with a peak cross section of 11.2 ± 0.2 b (1982SM02): see Table 7.4 (in PDF or PS). No other clearly defined resonance is observed to E_{n} = 49.6 MeV although the total cross section exhibits a broad maximum at E_{n} ≈ 4.5 MeV: see (1984AJ01). The analyzing power has been measured for E_{pol. n} = 1.48 to 5 MeV [see (1984AJ01)] and 5 to 17 MeV (1986PF1A; prelim.). Recent multilevel, multichannel Rmatrix analyses (1987KN04, 1983KN06) for E_{n} ≤ 8 MeV [using also data from other channels] include 13 normal and 14 nonnormal parity states with E_{x} ≤ 17 MeV. [Only ten states have been seen directly in reaction or compound nucleus crosssection work.] Two positiveparity states provide an explanation for the anisotropy of the ^{6}Li(n, α) work at low energies (1983KN06). For the results of an earlier Rmatrix analysis see (1984AJ01). Cross sections for n_{0} and n_{1} have also been measured at E_{n} = 7.75 and 8.90 MeV (1987SC08). The excitation function for 3.56 MeV γrays exhibits an anomaly, also seen in the (n, p) reaction (reaction 8). The data are well fitted assuming E_{res} = 3.50 and 4.60 MeV [E_{x} = 10.25 ± 0.10 and 11.19 ± 0.05 MeV], T = 1/2 and 3/2, Γ_{c.m.} = 1.40 ± 0.10 and 0.27 ± 0.05 MeV, respectively; both J^{π} = 3/2^{}: see (1979AJ01) for a discussion of these and other (unpublished) data. See also ^{6}Li, (1984FE1A, 1985CH37, 1986DR10), (1983DA22, 1983GO1H, 1984SH1C, 1988MA1H), (1986BOZG; applications) and (1981PL1A, 1983FA17, 1983FU11, 1983FU19, 1984FU04, 1984WA1H, 1985FU01, 1985LI1F; theor.).
For reaction (a) see (1985CH37, 1986CH24). The excitation function for reaction (b), measured from threshold to E_{n} = 8.9 MeV, exhibits an anomaly at E_{n} = 4.6 MeV. The excitation function, at forward angles, of p_{0} is approximately constant for E_{n} = 4.4 to 7.25 MeV: see (1979AJ01). The excitation function, at forward angles, of deuterons (reaction (c)) increases monotonically for E_{n} = 5.4 to 6.8 MeV: see (1979AJ01). See also ^{5}He, ^{6}He, (1986WAZY), (1984SH1C, 1986AU1D, 1988MA1H), (1986BOZG; applications) and (1987KN04; theor.).
The isotopic thermal cross section is 940 ± 4 b: see (1981MUZQ). See also (1985SW01). A resonance occurs at E_{n} = 241 ± 3 keV with σ_{max} = 3.3 b: see (1986CA28, 1984AJ01). The resonance is formed by pwaves, J^{π} = 5/2^{}, and has a large neutron width and a small αwidth: see Table 7.4 (in PDF or PS). Above the resonance the cross section decreases monotonically to E_{n} = 18.2 MeV, except for a small bump near E_{n} ≈ 1.8 MeV and an inflection near E_{n} = 3.5 MeV. For a description of Rmatrix analyses which suggest the location of higher states of ^{7}Li, see reaction 7 and (1984AJ01), as well as (1987KN04). Angular distributions have been measured at many energies in the range E_{n} = 0.1 to 14.1 MeV [see (1979AJ01, 1984AJ01)] as well as at 35 eV to 325 keV (1983KN03) and 2.16 to 4.20, 7.1 and 13.7 MeV (1986BA32, 1986BA68). Polarization measurements have been reported for E_{pol. n} = 0.2 to 2.4 MeV: the data suggest interference between swaves and the pwave resonance at 0.25 MeV. Interference between this 5/2^{} state and a broad 3/2^{} state 2 MeV higher also appears to contribute. At the higher energies A_{y} is close to +0.9 near 90° and varies slowly with E_{n}: see (1979AJ01). See also (1983VE10, 1984VEZW). For a study of coincidences in the ^{6}Li(n, αd)n reaction see (1986MI11). The triton production cross section at E_{n} = 14.92 MeV is 32 ± 3 mb (1985GO18). The total α production cross section [which includes the (n, nd) process] at E_{n} = 14.95 MeV is 512 ± 26 mb (1986KN06). See also (1983AS1D, 1983CO1E, 1986CA29), (1984SH1C, 1985BO1D, 1986MI1G), (1984YA1A; astrophysics), (1984XI1A, 1985GO18, 1986BA2N, 1986BOZG, 1986BR1L, 1986CH1S, 1986CO1H, 1986FA13, 1986GO1K, 1986GR1F, 1986MA1R, 1986PE1K, 1986SA1R, 1986SA1H, 1986SE1D, 1986SU1J, 1986TA1H, 1986VE1A, 1986WI1B; applications) and (1986HA45; theor.).
At E_{p} = 600 MeV, the reaction preferentially excites ^{7}Li*(4.63). Angular distributions have been obtained for the pions to ^{7}Li*(0, 0.48, 4.63) at E_{p} = 600 and 800 MeV. ^{7}Li*(11.24) [T = 3/2] is not observed: see (1984AJ01). Recently σ(θ) and A_{y} measurements were reported at E_{pol. p} = 800 MeV (1987SO1C; prelim.). See also (1985LE19).
Angular distributions of proton groups have been studied for E_{d} = 0.12 to 15 MeV and at 698 MeV: see (1966LA04, 1974AJ01, 1979AJ01, 1984AJ01). J^{π} of ^{7}Li*(0.48) is 1/2^{}. The two higher states have E_{x} = 4630 ± 9 and 7464 ± 10 keV, Γ_{c.m.} = 93 ± 8 and 91 ± 8 keV. The breakup reactions involve ^{7}Li*(4.63, 7.46) and possibly ^{7}Li*(9.6) [Γ = 0.5 ± 0.1 MeV]: see (1979AJ01). See also ^{8}Be and (1988KO1C).
The total photoneutron cross section rises sharply from 10 MeV to reach a broad plateau at about 15 mb from 14 to 20 MeV, decreases more slowly to about 0.5 mb at 25 MeV and then decreases further to about 0.3 mb at E_{γ} = 30 MeV (monoenergetic photons): there are indications of weak structure through the entire region: see (1979AJ01) and (1988DI02). [I am indebted to Prof. B.L. Berman for his comments.] A recent study by (1986SI18; E_{b.s.}) reports evidence for the excitation of ^{7}Li*(7.46), as well as of states at E_{x} = 13.75 ± 0.03 and 14.65 ± 0.03 MeV with Γ ≈ 500 and 700 keV [and integrated cross sections of ≈ 0.14 and 0.17 MeV · mb], in addition to a major broad structure at 17 MeV. The integrated cross section to 23 MeV is 39 ± 4 MeV · mb for the n_{0} transition and 17 ± 4 MeV · mb for the n_{1} transition: together these account for 0.4 of the exchange augmented dipole sum of ^{7}Li: see (1979AJ01). The integrated cross section for formation of ^{6}Li*(3.56) is 4 ± 1 MeV · mb to 30 MeV and 11 ± 3 MeV · mb to 55 MeV: see (1984AJ01). The total absorption cross section for natural Li in the range 10 to 340 MeV shows a broad peak at ≈ 30 MeV (σ_{max} ≈ 3 mb), a minimum centered at ≈ 150 MeV at ≈ 0.3 mb and a fairly smooth increase in cross section to ≈ 3 mb at ≈ 320 MeV: see (1984AJ01). The cross section for the (γ, p) reaction (reaction (c)) shows a maximum at ≈ 15.6 MeV with a width of ≈ 4 MeV. It then decreases fairly smoothly to 27 MeV. The integrated cross section for 11 → 28 MeV is 13.2 ± 2.0 MeV · mb: see (1974AJ01, 1979AJ01, 1984AJ01). Differential cross sections for the (γ, n_{0} + n_{2}) and (γ, p_{0}) processes are reported by (1983SE07, 1985SE17; E_{γ} = 48 to 141 MeV). Reaction (e) has been studied in the giant resonance region with E_{bs} ≤ 30 MeV. Deuteron groups to ^{5}He_{g.s.} and possibly to the first excited state are reported. States of ^{7}Li with E_{x} = 25  30 MeV may be involved when E_{bs} = 37 to 50 MeV is used: see (1979AJ01). At E_{γ} = 0.9 GeV, (1985RE1A) have studied π^{} emission with the population of ^{6}Li*(2.19). The cross section for reaction (f) at 90° displays a broad resonance at E ≈ 7.7 MeV (Γ = 7.2 MeV) with an integrated cross section of 6.2 MeV · mb, a plateau for 12 → 22 MeV (at ≈ 0.6 the cross section at 7.7 MeV) and a gradual decrease to 48 MeV. The (γ, t) cross section integrated from threshold to 50 MeV is 8.1 MeV · mb: see (1984AJ01), and (1986VO20). See also (1985HA1H, 1986GO1M) and (1983BE45, 1983BO1B, 1983BU1A, 1983SR1B, 1984KR10, 1985GO1A, 1985ST1A, 1986AH03, 1986BA2G, 1987BU04, 1987KA1V, 1987KI1C, 1987KO43, 1987LU1B, 1987VA05, 1988SH20; theor.).
See Table 7.4 (in PDF or PS) in (1966LA04) [summary of early measurements] for τ_{m} of ^{7}Li*(0.48) = 107 ± 5 fsec. See also (1984AJ01), (1987BE1K) and (1986DU03; theor.).
The electric form factor measurements for E_{e} = 100 to 600 MeV are well accounted for by a approxple harmonicoscillator shell model with a quadrupole contribution described by an undeformed pshell: r_{r.m.s.} = 2.39 ± 0.03 fm, Q = 42 ± 2.5 mb. From results obtained for E_{e} = 24.14 to 97.19 MeV, r_{r.m.s.} = 2.35 ± 0.10 fm (model independent), 2.29 ± 0.04 fm (shell model). A study of the ratio of the electric charge scattering from ^{6}Li and from ^{7}Li as a function of (momentum transfer)^{2} yields < r^{2} >^{1/2}_{6}/< r2 >^{1/2}_{7} = 1.001 ± 0.008. The r.m.s. radius of the ground state magnetization density distribution, < r^{2} >^{1/2}_{M} = 2.98 ± 0.05 fm. See (1979AJ01) for references. Inelastic scattering studies show peaks corresponding to ^{7}Li*(0.48, 4.63, 6.68, 7.46): see (1974AJ01) and Table 7.5 (in PDF or PS). Form factors for ^{7}Li*(0, 0.48) have recently been studied at E_{e} = 80 to 680 MeV (1987LI1J; prelim.). For quasielastic processes see (1984AJ01) and (1985SE17). See also (1983BE1A, 1987DE43) and (1984DO20, 1984DU13, 1984KA06, 1984KA04, 1984PE12, 1984SH26, 1985WA17, 1986BAYN, 1986DO11, 1986SA1D, 1987KA22, 1987SA1C, 1988BO05; theor.).
^{7}Li*(0, 0.48, 4.63, 6.68, 7.46, 9.67) have been populated in this reaction. Angular distributions have been measured at E_{π+} = 49.7 MeV and E_{π±} = 143 and 164.4 MeV: see (1984AJ01). Total and partial cross sections have been obtained for E_{π±} in the range 85 → 315 MeV [see (1984AJ01)] and at E_{π+} = 50 MeV (1983NA18). For the (π^{+}, 2p) reaction see ^{5}He (1986RI01). For studies of (π^{+}, pd) and (π^{±}, pn) see (1986WH01) and (1986YO06), respectively. For π^{+} induced fission of ^{7}Li see (1983BA26). See also the "GENERAL" section.
Angular distributions have been measured at E_{n} = 1.5 to 18 MeV [see (1979AJ01, 1984AJ01)] and at E_{n} = 5.4, 6.0, 14.2 MeV (1985CH37; n_{0+1}, n_{2}), 7 to 14 MeV (1983DA22; n_{0}), 8.0 and 24.0 MeV (1986HAZR; n_{0} and n_{2} at 24 MeV; prelim.), at 8.9 MeV (1984FE1A; n_{0+1}, n_{2}; prelim.) and at 14.7 MeV (1984SH01; n_{0+1}). Reaction (b) at E_{n} = 14.4 MeV proceeds primarily via ^{7}Li*(4.63) although some involvement of ^{7}Li*(6.68) may also occur: see (1979AJ01). See also ^{8}Li, (1986LI15, 1987DE14, 1987SC08) and (1985CO18; applications).
Angular distributions of protons have been measured for E_{p} = 1.0 to 185 MeV [see (1974AJ01, 1984AJ01)] and at E_{pol. p} = 1.89 to 2.59 MeV (1986SA1P; p_{0}; prelim.). Inelastic proton groups have been observed to ^{7}Li*(0.48, 4.63, 7.46, 9.6): see (1952AJ38, 1974AJ01). Double differential cross sections for the continuum are reported at E_{pol. p} = 65 MeV (1987TO06; prelim.). For reaction (b) see (1984PA1B, 1985PA1B; 50  100 MeV; prelim.) and (1985BE30, 1985DO16; 1 GeV). See also ^{6}He and (1984AJ01). For reaction (c) see (1986WA11). For reaction (d) see (1985BE30) and ^{6}Li. Reaction (d) has been studied at E_{p} = 200 MeV: the deuteron spectroscopic factor is close to unity and the results indicate that the deuteron cluster momentum distribution is characterized, at small momentum, by a FWHM of 140 MeV/c. Cross sections for the (p, pt) reaction (reaction (e)) are very small but are consistent with a spectroscopic factor of unity for t + ^{4}He in ^{7}Li (1986WA11). For reaction (e) see also (1983GO06, 1985PA04, 1985PAZL). See also ^{5}He and (1984AJ01). See also ^{8}Be, (1983AN18, 1983GLZZ, 1986SH1P, 1987GAZM, 1987PA1G), (1983CH1B, 1987LE33), (1986HA1T; applications) and (1984GU14, 1985KA1D, 1985PA03, 1986IM1A, 1987IM1F, 1987IM04, 1987VD01; theor.).
Angular distributions have been reported for E_{d} = 1.0 to 28 MeV [see (1974AJ01, 1979AJ01)] and at 50 MeV (1988KO1C; prelim.). See also ^{9}Be and (1987GOZF) for a breakup study.
Angular distributions have been reported at E(^{3}He) = 11 MeV to 44.0 MeV and at E(^{3}pol. He) = 33.3 MeV: see (1974AJ01, 1984AJ01). The missing mass spectrum in reaction (b) at E(^{3}He) = 120 MeV indicate, in addition to the unresolved group to ^{7}Li*(0, 0.48), a small peak at E_{x} = 17.8 ± 0.5 MeV, possibly some structure between 30 and 40 MeV, a peak at 40.5 ± 0.5 MeV (Γ ≈ 2  3 MeV) and possibly some structure at higher energies (1985FR01). For pion production see (1984BR22).
Angular distributions (reaction (a)) have been reported for E_{α} = 3.6 to 29.4 MeV [see (1974AJ01, 1984AJ01)] and at E_{α} = 35.3 MeV (1985DI08; α to ^{7}Li*(0, 0.48, 4.63, 6.68, 7.46, 9.67); collective coupled channel analysis). See also (1987BU27). Reaction (b) has been studied at E_{α} = 18 to 64.3 MeV [see (1974AJ01, 1984AJ01)] and at 27.2 MeV (1985KO29). ^{7}Li*(4.63) is strongly involved in the sequential decay, as are possibly ^{7}Li*(6.68, 7.46). See also (1987DM1C, 1987VA29, 1988DM1A), (1988BO46) and (1986ZE01, 1987KO1L; theor.).
For reaction (a) see ^{6}Li. The elastic angular distribution (reaction (b)) has been studied for E(^{7}Li) = 4.0 to 6.5 MeV [see (1974AJ01)] and 2.0 to 5.5 MeV (1983NO08).
Elastic angular distributions have been measured at E(^{7}Li) = 34 MeV [see (1979AJ01)] and at 78 MeV (1986GLZU, 1986GLZV; also to ^{7}Li*(4.63)). For the interaction cross section at 790 MeV/A see (1985TA18).
For reaction (a) see ^{10}B. Angular distributions have been studied for reaction (b) to ^{7}Li*(0, 0.48) and at E(^{7}Li) = 34 MeV (1987CO02, 1987CO16). See also (1987HNZZ; theor.).
Angular distributions (reaction (a)) involving ^{7}Li*(0, 0.48) have been studied at E(^{7}Li) = 4.5 to 89 MeV [see (1975AJ02, 1979AJ01, 1984AJ01)] and at E(^{7}Li) = 53.8 MeV and E(^{12}C) = 92.3 MeV (1984VI02, 1986CO02; also to ^{7}Li*(4.63)) and at E(^{7}Li) = 131.8 MeV (1988KA09; ^{7}Li*(0 + 0.48); and various states in ^{12}C) as well as at E(^{7}pol. Li) = 21.1 MeV (1984MO06; elastic). See also (1986GLZU) and ^{12}C in (1985AJ01, 1990AJ01). Breakup studies involving ^{7}Li*(4.63) are reported at E(^{7}Li) = 70 MeV (1986DAZP, 1986YOZU; prelim.) and 132 MeV (1986SHZP; prelim.). The interaction cross section on carbon at 790 MeV/A has been measured by (1985TA18). The elastic scattering in reaction (b) has been studied for E(^{7}Li) = 4.5 to 34 MeV [see ^{13}C in (1986AJ01)] and recently by (1987CO02, 1987CO16; 34 MeV; also to ^{7}Li*(0.48)). See also (1983STZS), (1983BI13, 1984HA53, 1986KA1C, 1986MO1E, 1987PA12) and (1980KH09, 1982GU21, 1983KH1A, 1984BE35, 1984GR05, 1984UH1A, 1985HE25, 1985KH08, 1985SA13, 1986KA1B, 1986SA15, 1986SAZL, 1986SA1D, 1986YO1A, 1987AR13, 1987KA1I, 1987SA1C, 1988OT01, 1988SA10; theor.).
Elastic angular distributions (reaction (a)) are reported at E(^{7}Li) = 36 MeV [see (1981AJ01)] and E(^{14}N) = 150 MeV (1986GO1H) while those for reaction (b) have been studied at E(^{7}Li) = 28.8 MeV [see ^{15}N in (1986AJ01)].
The elastic scattering has been studied at E(^{7}Li) = 9.0 to 20 and at 68 MeV [see ^{16}O in (1986AJ04)] as well as at E(^{7}Li) = 50 MeV (1984CO20). For fusion cross section and breakup studies see (1984MA28, 1986MA19, 1986SC28, 1988MA07). See also (1982GU21, 1988PR02; theor.).
Angular distributions have been studied at E(^{7}Li) = 36, 68 and 89 MeV: see ^{20}Ne in (1983AJ01).
The elastic scattering has been studied at E(^{7}Li) = 89 MeV and at 27 MeV (reaction (b)): see (1984AJ01). A study of the breakup on ^{27}Al is reported by (1986NAZV) and the interaction cross section at 790 MeV/A has been measured by (1985TA18). See also (1988OT01, 1988SA10; theor.).
Angular distributions involving ^{7}Li*(0, 0.48) and various states of ^{28}Si and ^{40}Ca have been studied at E(^{7}Li) = 45 MeV. The elastic scattering on ^{40}Ca and ^{48}Ca has been studied at E(^{7}Li) = 28, 34 and 89 MeV [the latter also to ^{7}Li*(0.48)]: see (1984AJ01). Angular distributions (reaction (b)) involving ^{7}Li*(0, 0.48) have also been reported at E(^{7}Li) = 34 MeV (1985SA25). See also (1985GO11, 1986SA1D, 1987SA1C; theor.).
The decay proceeds to the ground and 0.48 MeV states. The branching ratio to ^{7}Li*(0.48) is (10.52 ± 0.06)%: see Table 7.6 (in PDF or PS) and (1984AJ01). The adopted halflife is 53.29 ± 0.07 d. Both transitions are superallowed: log ft = 3.32 and 3.55 for the decays to ^{7}Li*(0, 0.48). See also (1979AJ01). The firstexcited state has E_{x} [from E_{γ}] = 477.612 ± 0.002 keV: see (1984AJ01). See also (1983TAZY), (1982BA1J, 1983FO1A, 1983VO1C, 1984BO1C, 1984DA1H, 1984HA1M, 1984SU1A, 1985BA1N, 1985BA1M, 1985CA41, 1985DE1H, 1985KR1B, 1986GR04, 1986HA1I, 1986RO1N, 1987AR1J, 1987BA89, 1987FR1C, 1987KR10, 1987RI1E, 1987RO25, 1987WE1C, 1988BA86, 1988FO1A; astrophysics) and (1983WA13, 1983WA1J, 1986DU1E, 1986HA1Q, 1987DR1A; theor.).
The capture of stopped pions has been studied in a kinematically complete experiment: ^{7}Li*(0, 0.48) are weakly populated. Two large peaks are attributed to the excitation of ^{7}Li*(7.46, 10.25). The recoil momentum distributions corresponding to these peaks are rather approxilar and both indicate a strong L = 0 component: see (1979AJ01).
An angular distribution is reported at E_{n} = 14.6 MeV (1987ZA01; t_{0+1}). See also (1979AJ01) and ^{10}Be.
At E_{p} = 43.7 MeV angular distributions have been obtained for the ^{3}He particles corresponding to ^{7}Li*(0, 0.48, 4.63, 7.46). The 7.46 MeV state is strongly excited while the mirror state in ^{7}Be is not appreciably populated in the mirror reaction (see reaction 17 in ^{7}Be). The angular distribution indicates that the transition to ^{7}Li*(7.46) involves both L = 0 and 2, with a somewhat dominant L = 0 character. The J^{π} = 3/2^{}, T = 3/2 state is located at E_{x} = 11.28 ± 0.04 MeV, Γ = 260 ± 50 keV: see (1979AJ01). Reaction (b) at E_{p} = 58 MeV involved ^{7}Li*(0, 0.48, 7.47) (1985DE17). See also (1987KA25).
Angular distributions have been measured for E_{d} = 0.4 to 27.5 MeV [see (1966LA04, 1974AJ01, 1979AJ01)] and at E_{pol. d} = 2.0 to 2.8 MeV (1984AN16; α_{0}, α_{1}). A study at 11 MeV finds Γ_{c.m.} = 93 ± 25 and 80 ± 20 keV, respectively for ^{7}Li*(4.63, 7.46). No evidence is found for the T = 3/2 state ^{7}Li*(11.25). In a kinematically complete study of reaction (b) at E_{d} = 26.3 MeV, ^{7}Li*(4.6, 6.5 + 7.5, 9.4) are strongly excited. No sharp αdecaying states of ^{7}Li are observed with 10 < E_{x} < 25 MeV. Parameters for ^{7}Li*(9.7) are E_{x} = 9.36 ± 0.05 MeV, Γ = 0.8 ± 0.2 MeV: see (1979AJ01). [E_{x} = 6.75 ± 0.20 MeV, Γ = 0.87 ± 0.20 MeV (1986PAZN; prelim.)]. A study of inclusive αspectra at E_{d} = 50 MeV has been reported by (1987KA17) who suggest the involvement of a ^{7}Li state at E_{x} = 18 ± 1 MeV, Γ = 5 ± 1 MeV. For reaction (b) see also (1987VA29). See also (^{11}B in 1985AJ01) and (1988NE1A; theor.).
Angular distributions involving ^{7}Li*(0, 0.48) have been reported at E(^{6}Li) = 32 MeV (1985CO09) and E(^{9}Be) = 14 MeV (1985JA09).
Angular distributions of α_{0}, α_{1} and of α_{2} at the higher energies have been measured at E_{n} = 2 keV to 14.4 MeV: see (1979AJ01, 1984AJ01). τ_{m} (0.48) = 102 ± 5 fsec (1985KO47). A search for an asymmetry of αparticles emitted forward and backward with respect to the neutron spin (due to parity nonconserving effects) gives upper limits of 3.7 × 10^{6} and 6.1 × 10^{7} for the α_{0} and α_{1} groups, respectively (1986ER05). For other polarization studies (involving both n and ^{10}B) see (1986KO19) and ^{11}B in (1990AJ01). See also (1986CO1M; applications).
See ^{5}Li.
Angular distributions involving ^{7}Li_{g.s.} and ^{7}Be_{g.s.} and ^{7}Li*(0.48) + ^{7}Be*(0.43) have been studied at E_{α} = 91.8 MeV (1985JA12, 1986JA03). See also (1988SH1E; theor.).
Delayed αparticles have been observed in the β^{} decay of ^{11}Be: they are due to the decay of ^{11}B*(9.88) [J^{π} = 3/2^{+}]. This state decays by αemission (87.4 ± 1.2)% to the ground state of ^{7}Li and (12.6 ± 1.2)% to ^{7}Li*(0.48) (1981AL03). See also ^{11}Be, ^{11}B in (1985AJ01).
Angular distributions involving ^{7}Li_{g.s.} and ^{7}Be_{g.s.} and ^{7}Li*(0.48) + ^{7}Be*(0.43) have been studied at E(^{3}He) = 71.8 MeV (1986JA02, 1986JA03). See also (1987KW01, 1987KW03; theor.).
Angular distributions have been measured at E_{α} = 27.2 to 29.0 MeV and at 65 MeV. At E_{α} = 65 and 72.5 MeV, ^{7}Li*(0, 4.63) are very strongly populated while ^{7}Li*(0.48, 6.68, 7.46) are weakly excited: see (1979AJ01, 1984AJ01).
Angular distributions involving ^{7}Li_{g.s.} and ^{7}Be_{g.s.} and ^{7}Li*(0.48) + ^{7}Be*(0.43) have been studied at E_{d} = 39.8 MeV [see (1979AJ01)] and at 78.0 MeV (1986JA03, 1986JA15). See also (1984NE1A) and (1987KW01, 1987KW03; theor.).
Angular distributions have been studied at E_{t} = 38 MeV to ^{8}Be_{g.s.} and ^{7}Li*(0, 0.48) (1986SIZS; prelim.).
Angular distributions are reported at E_{α} = 49.0 and 80.1 MeV (1984GO03). See also (1984AJ01).
Angular distributions have been obtained at E(^{6}Li) = 36 MeV for the transitions to ^{7}Li*(0, 0.48): see (1979AJ01). See also (1986GL1E).
At E_{d} = 14.6 MeV angular distributions are reported for the transitions to ^{7}Li*(0, 0.48) and ^{8}Be_{g.s.}: see (1979AJ01). See also (1984NE1A, 1984SH1D).
At E_{n} = 14.1 MeV, ^{7}Li*(0, 0.48) are approximately equally populated: see (1979AJ01). Differential cross sections have been measured at E_{n} = 14.4 and 18.2 MeV involving ^{8}Be_{g.s.} and ^{7}Li*(0 + 0.48, 4.63) (1986TU02).
At E_{d} = 14.6 to 15.0 MeV, angular distributions have been measured for the transitions to ^{12}C(0) + ^{7}Li*(0, 0.48) [reaction (a)], ^{13}C(0) + ^{7}Li*(0, 0.48) [reaction (b)] and ^{14}N(0) + ^{7}Li*(0, 0.48) [reaction (c)]: see (1979AJ01). See also 1984AJ01).
