Ewbank, Wesley B.

Marino, Lawrence L.

Nierenberg, William A.

Shugart, Howard A.

Silsbee, Henry B.

eScholarship - University of California

Lawrence Berkeley National LaboratoryRecent WorkTitleSPINS OF INDIUM-109, INDIUM-110m, AND INDIUM-111Permalinkhttps://escholarship.org/uc/item/57c6n1mzAuthorsMarino, Lawrence L.Ewbank, Wesley B.Nierenberg, William A.et al.Publication Date1958-02-24eScholarship.org Powered by the California Digital LibraryUniversity of California• ..., ' 1 .J • UNIVERSITY OF CALIFORNIA TWO-WEEK lOAN COPY This is a Library Circulating Copy which may be borrowed for two weeks. For a personal retention copy, call Tech. Info. Division, Ext. 5545 BERKELEY. CALIFORNIA • • • • . . • • • • •• . ~. . . . . . . ~. • • • • • • • • . • • ... • • •• • • • . . •• • • DISCLAIMER This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor the Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by its trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof, or the Regents of the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof or the Regents of the University of California. " .. --1 --·t· UNIVERSITY OF CALIFORNIA Radiation Laboratory Berke!ey0 California Contract No. Wo"§~0S=eng=48 SPINS OF INDIUMolOCiQ INDIUMcUOm, AND INDIUM-lU Lawrence L. Marino0 Weoley B. Ewbanko William A& Nierenberg, Howard A. Shusa:rt and Henry B. SUobee February Z40 1958 Pt"intoc•. foi' the U. S. Atomie En.erBY CommirJ aton 'I SPINS OF IN DIUM-1 090 INDIUM- it 1 Om9 AND IN DlUM-l All Lawrence Lo M<?.rinoc Wesley B. Ewbank., William A Nierenberg Ho~hard Ao Shugart and Henry B. Silsbee Radiation Laboratory and Department of Physics Unive~sity of Californiav Berkeley0 Califo:rnia February 249 1958 ABSTRACT The nudear opine of three neutron-deficient radioactive iootope s of indium have been mea-.sured by the use of the atomic,beam magneticoresonance techniqueo Retiu!ts arl'e I s 9/Z for 4.3~hr In 109; 1 !OJ 1 for 5o0-hr In HOm; and I s 9/ Z for Z.8-day In H A o -3~ UCR.L.-OHL * SPINS OF !NDIUM-1090 INDIUM-HOm, AND INDIUM-111 LawrenceeL. Marino0 Wesley B. Ewbank, William A. Nlerenberso t Howard A. Shugart0 and Henry B. Silobee Radiation Laboratory and Department of Physice Univeroity of Caliiornia0 Berkeley0 California February 240 1958 EXPERIMENTAL METHOD The atomic-beam magnetic-resonance flop-in technique uoing radioactive detection has been applied to the measurement of the spin angular momentum of three indium isotopeso The spin-measuring procedures which involves oboex·vin• ~ mF !>l :.t: 1 tranoitiono in the linear Zeexnan region, has been given earlier. 1 z 2 Of the two electronic states ( Pl/Z and P 3/ 2» that are populated at the temp-erature of the oven0 the 2P 3; 2 state giveo larger resonances with our apparatu.n and wao uoed for the measurements described here. ln particularo Tab!e I (Jives the transitiono that have been observed for the various isotopee. A second oven containing rubidium bromide and calcium provided an eaoU.y detectable atomic beam of rubidium for field calibration. TABLE I =======--::'::":-::::== __:=-::::::.::::::::.=-=---~--~--... · ... -======·=-·.;;;::;·-·;;.:;-.::::;;·--:..:;-:=-;;;:;:;-=-=···;:::;;;---:;;:;;;··-~=-i!Olotope Electronic State F ------------------,----------------------------------------------------~ 109 6 -4.- -S 5 - 3--4 UOm 171/l. ~ 13/Z -=-·- 15/Z Uli 6 wnn ... ... Research euppo:rted jointly by the U.S. Atomic Ene;:gy Commiooion and the Office of Naval Re sea"'ch. '?'Professor in th~ MiUe~ 1nat·ltute for Baoic Res0arch in Science. -4-The isotopes In109 (4. 3 brio 2 InUOm (5. 0 h2do 3 and In 1H (2. 8 day) 3 were made in the Crocker 60-in. cyclotron on the Berkeley campua~ using (0.0 ltn .. reactions in 0.010-in. silver foil. Following solution of the silver foil in con-centrated nitric acid with about 10 mg of indium carrier0 the silver was pre-cipitated as the chP.ori.de by the addition of concentrated HCl. After the precip-itate wae oeparated b~r centrifugingo oxalic acid or Rochelle saU was added to the supernatant for plating purposes. Jtrom a slightly acid solution the indium wao then electroplated onto either a platinum or indium electrode0 ueifl8 0. 2 amp plating current. At first the electro.de wao placed directly in either a carbon or a tantalum oven. which was heated in the apparatus by electron bom.bardment. Later experimentation showed that a steadier bearn resulted if the indium deposit: was scraped from the platinum electrode. The chemical oeparation required about 1. 5 hours. lNDlUM-lnl RESULTS Because runs 88 and 93 were made several days after the botnbardmentD. the shorter-lived isotopes had decayed, leavins relatively pure In 111• With only a single activity present in the beam0 resonance indications must be detel"-mined on the basis of absolute counting rates. The resulto of opin eearchea are indicated in Table n. For runa 88 and 93 the spin-9/2 signals are an order of masnitude greater than thooe for other half-integral values. Decay curves for these resonances showed a single 2. 8-day component which indicated that In111 was reaponsible for the signal. The In 111 resonance has been oboerved from 4. 8 to fl. 8 Me/sec. to establish the linear Zeeman dependence of the resonance frequencies on the low-transition magnetic field. INDA'uM- i l Om RESULTS When the target was processed ir.mnediately after bombardment, it c~ntained in. addition to In 111 severali other isotopes including (4. 3 hi') In 109 and {5. 0 hr] In UOm. Becauoe of low counting rates it is not poosible to distinguish between 4o 3 and 5. 0 hours by decay alone. However, In 109 mue\: have half-integrai opi:.l while In llOm must have integral opin. 'fhio information alone with an approxbnate half-life deteirmination eufficeo to egtabliah the identity of these ohort-lived hotopeo. TABLE 11 / ... --~--~-~--,·~·--======r==========--Table of initial counting rates of indium spin searches. ;; .. un l 2 5/2 1/2 4 9/2 5 U./2 6 8 Hl OC (In only» O.SU) Ct.8U9 S.Z(Z» Hl S3 (In onlyp o.6U» 6.6{2) OAC.l» ?·6 0.9«3»t 0.5(lp o.su; CI1.4U) 2.3(2.) 0.1~2» 0.4(1~ 1.6(2} :·O~ s.zu» l. 9(2» 4.5(2) 3.5€Zo >O! a resonance. sweep of In109 at zz Mc/oec. ~os 110m / a re13onance sweep of In at 12. Me aec. ~heoe r~'t;o (in arbitrary unite) are corrected for counter background and normalized for variations '-n beam inten~Jity within a single run. All runo were performed at different values of magnetic field. 1' Poor normalization ~The 2P312, F = 5, mF "'' ·· ~- --1 t!'~:::;;!i.ion ior I = 9/2 occuro at the oame frequency as the 2P 3/?..' ;p ::: ~9/2, mF = -15/2 - - 17 I 2 transition for I ; 8 within the line width. § I \J\ I ~ . '0: -6- UCRL-8187 Because three iootopes con.t:dbute to the initiat counting rates~ each sample may be analya:ed for the relative composition _of short (4o3~and 5oO~h~) activity and liong (ZoS.,day) activityo When thio is done all! show~ in Table IU for run 104, the ratio of short to ~ong components of the counting rate on the "haU'=beam" sample (magnets on but stop~wire removed) at zero time io 3o lo Tbe spin-S sample. though very sma.U in absolute counting rate. ehowe a simUar ratio (Zo 4) for. an apparatus background liHAmple 0 ae woultd be expecteda On the other hand. it is clear from Table lU that the npin-7 uampl!.e contains an HOm . enhanced ohort compcnent (In )o Xn fact the short component on the oplno 7 sample is Zo 7 times th.e apparatus background (spin-S sample) 0 while the long components are eseen.tiaUy equalo Further confirmation of spin 7 fo,;o Xn llOm comes from information of runs 96 and 108. Xu run 96 (Table llt» the normalized counting rate for spin 7 is 3.1 timeD the avernge rate for the oth<er integral!. spinso (En run 104 the oigna11. at nspin 8" is the 2P l/l! F g 5., mF gg ~3 - ~4 tranmition for the 9/1. material., Thic oignat supporto the 9/l. a9signment of Xn109 and In1 U.) TABLEltll i± ee = = Cornpooition analysio of aamplea trorn run 104o Counting rates are not correetad for variations in beam intenoityo = Sample Short activity Long activitiy (cpm) (cpm~ "Half-beam" 276 (3) 90 (Z) 3.1(Z) 9/Z 9o9(7) 5.6 (4) lo8 (l) 5 Z.6(4) 1.1 (Z) ZA (6) 7 7.1(1) loS (Z) 4. 7 (8) irND!UM-109 RESULTS The epin-9/2 button of run 104 (Table III) sbowB dgnificantly more obort activity (9. 9 cpm) thnn. a typical background oample, e. g. apin 5 with only Zn 6 cpm of ohort activity. The exporJureo were roughly equal; eo the enhancement by -7- ucru.. .. c:.n·t a factor 3o 8 io attribv.ted to a spin-9/Z signal from In 109 o Liltewioe the compoflition of the I = 9/l eampile differs from that of the "haU~baa:m" cample in such a way as to indicate the relative enrichment of tn109 and In 111 over 110m . . 109 . 110111 ltn o The aigna~ also baa about the right magmtude, for 1f lrn and In were produced more ur leas equ!i.lllyo the "half=beam" ohows that each would contribute about lo 5 timeo ao much initial. activity aa Xn lll o The oboerved ratio of In109 to In111 on the opin-9/Z sample io lo 8 before any apparatus background correctiona. Similar reoulto from other :runs have confirmed the 9/Z~opin assignment to In109o REMARKS Spin 9/Z for In111 and In109 agrees with the simple aheUe.model pre-diction that the forty-ninth proton is in a gfl/1. atateo 4 Spin 7 for ltn llOm could arioe from coupling of a g9/Z proton and a dS/l neutrone which io predicted by the shell model in thh regiono The eeriee from 1i'.nllOm (I= 7) to !n114m 5 and Xn116m (I= 5) 5• 6 may then illustrate the tranoition from a dS/Z to an o1; 2 leveR !or the odd neutron. • REFERENCES 1. Hobsonv HubbaQ Nierenbergo Silsbee 0 and Sunderland0 Phyo. Rev. 104 , 2 ... ~: (1956)o z. Eo C. Ma'Uary and M, Lo Pool, Phys. Rev. !f!~ 1454 (1949). 3. Carl L. McGinnis~ Phye. Rev. !!o 734 U 951). 4. M.G. Mayer and J. H. D. Jeneen0 Elementary Theo?y of Nudear SbeU = = """"---===·=--~=--~-..:.;...-~~cb.lre (Wi1Leye New York, 1955) pp. 74~8L 5. L.S. Goodman and S. Wexler, Phye. Rev. !O_~,o 1245 (1955); Phyo. Rev. _!2!" 1796 (t955); and Phye. Rev. 1,2!~ 15Z4 (1957). 6. P. B. Nutter, Phil. Mag. !,o 587 (1956). Information Divioicm hr .. f 

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SPINS OF INDIUM-109, INDIUM-110m, AND INDIUM-111

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SPINS OF INDIUM-109, INDIUM-110m, AND INDIUM-111

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