Ishizaki, Yoshihide

Koori, Norihiko

Koyama, Katsuzi

Ogino, Kouya

Sakaguchi, Harutaka

Sato, Kenji

Takeuchi, Suehiro

Tanabe, Tetsumi

Yasue, Masaharu

Kyoto University Research Information Repository

TitleContinuous Energy Spectra of Deuterons in the ³He+²HReaction Induced by 81.4 MeV ³He (Memorial Issue Dedicatedto the Late Professor Yoshiaki Uemura)Author(s)Tanabe, Tetsumi; Yasue, Masaharu; Sato, Kenji; Ishizaki,Yoshihide; Koyama, Katsuzi; Koori, Norihiko; Ogino, Kouya;Sakaguchi, Harutaka; Takeuchi, SuehiroCitationBulletin of the Institute for Chemical Research, KyotoUniversity (1974), 52(1): 284-287Issue Date1974-07-25URL http://hdl.handle.net/2433/76516RightType Departmental Bulletin PaperTextversionpublisherKyoto University            Bull. Inst. Chem. Res., Kyoto Univ., Vol. 52, No.  1 ............................ R          Note             Continuous Energy Spectra of Deuterons in the 3He+2H                    Reaction Induced by 81.4 MeV 3He                        Tetsumi TANABE, Masaharu YASUE,Kenji SATO,                            Yoshihide ISHIZAKI, Katsuzi KOYAMA,*                              Norihiko KooRI,** Kouya OGINO,***                       Harutaka SAKAGUCHI, and SuehiroTAKEUCHI****                                           Received January 4,1974             A great number of experiments have been made for the search of excited states of         3He. Recently Chang et al.') presented evidence on the existence of T=1/2 resonance         in the 3He system from measurements of radiative capture of protons by deuterons.         This was interpreted as a broad resonance in 3He at an excitation energy of 14.5 +         0.5 MeV with a width of about 2 MeV. Additional evidence for the resonance near         15 MeV excitation in 3He was presented by Arvieux et a1.2) followinga study of a phase—         shift analysis of nucleon-deuteron scattering cross sections in the energy range 0 —         46 MeV. It is interesting to ascertain the existence of this resonance by using other         reactions. We report on results of preliminary experiments about the 2H(3He, d)3He*         reaction at 81.4 MeV. This reaction has not yet been reported about searching for          evidence of excited states in 3He. By using this reaction, resonancesin 3He were search-        ed for excitation energies up to 20 MeV.             The experiment was performed with an 81.4 MeV 3He beam from the INS—FM          cyclotron. The beam was transported on a target chamber through a beam analyzer         magnet system. The beam intensity on the target was about 1 nA without debunching.         Reaction particles were analyzed with a broad-range magnetic spectrometer using 200          proportional counters followed by scintillation counters.3> Deuterons were separated         from other particles by different Bp-values due to reaction kinematics. However, the         separation of tritons was not possible because Bp-values of tritons are larger than those         of deuterons in the present reaction. Firstly, a deuterated polyethylene (CD2) foil          of 4.87 mg/cm2 in thickness was used as a target. Spectra of deuterons were measured         at 6 and 10 degrees. Then, with a 5.64 mg/cm2 thick carbon target, spectra were         obtained at corresponding angles. The over-all energy resolution was about 400 keV         (FWHM) for a peak of elastic scattering by deuteron, which was limited mainly by the         energy loss in the target and the kinematical spread due to finite solid angle of the spec-           trometer.             * MINX -r447*, 'J\dr;; Institute for Nuclear Study, Univer-                 sity of Tokyo, Tokyo.                ** j: Department of Nuclear Engineering, Faculty of Engineering, Kyushu University,                    Fukuoka. *** g/TP-(ti,: Department of Nuclear Engineering, Faculty of Engineering, Kyoto University,                    Kyoto. **** tfig6A , : Department of Physics, Faculty of Science, Kyoto University, Kyoto. ( 284 )                   Continuous Deuteron Spectra from  3He+3H at 81 MeV   5000- CD2(HE3,D) _. 40006 DEG. 600 NC.   zz=                              3000                         u                                                         °5oI '°z22000i.1 1000 ° 050100 190200                                                    CHANNEL NUMBER(a) 5000 12C(HE3,D)13N 40036 DEG.CI=600 NC. 20     = 300015 2      20001010                         U A4111 0000No 5                      050 CHANNEI00NUM BER 15~+-. 2 0 (b) __. _...__. . .        Fig. 1. Typical examples of deuteron spectra at 6°. Figure 1—a shows the spectrum               of deuterons for the (3He, d) reaction on a deuteratedpolyethylene (CD2) target. Figure 1—b shows the spectrum of deuterons for the 12C(3He, d)13N                reaction. Line shows the relation between the channelnumber of the                spectrometer and the excitation energy of 13N.    Typical deuteron spectra from the CD2 and C targets are shown in Fig. 1. The background of deuterons from carbon in the CD2 target was subtracted using the spectra of the carbon target after normalizing deuteron peaks at the 12C(3He, d2,3)13N(3.51 and 3.56 MeV) reaction of both data. In order to smooth these data, yields of five channels were added.    Figures 2 and 3 show deuteron spectra obtained at 6 and 10 degrees respectively. Besides the continuous parts, the spectra show a number of discrete peaks. A large peak at the high energy side is deuteron scattered elastically by the incident 3He. Two peaks at the low energy side can be assigned kinematically as proton and a particle from the 2H(3He, p)4He reaction. The contamination of proton and a particle in deuteron spectra at the higher energies than these peaks can be neglected. The disturbance from tritons seems unimportant from small amount of the background at the higher energies than the deuteron peak of the elastic scattering.    The thresholds of two-body -(p+d) and three-body (p+p+n) breakup of 3He are shown in these figures. It is apparent that deuteron continua are almost structureless. So, there is no significant evidence for production of relatively strong resonance of 3He. The present result implies some limit on its cross section, but does not necessarily exclude the existence of resonances.    The continua exhibit a broad maximum towards the high-energy end at 6° which (285)                                        T. TANABE et al.    - I  I I  I  1------------------------------------------------------------------------------------------------------------------------------i                            D(3He,d)3He*`- E3He = 81.4 MeV-                 81°b = 6°-                           -10.0—                                - d --               E LD(3He,p)4Hep+p+n threshold • -                                      l{{1{{~{{i{}{{itiit{~a{{ b5.0 —It {{{{t){{{t{{      ((              xt I itfll"\f p+d-             11;i1) threshold -           • 0(3He,a)H F : 1i • 11t}     Xt0 _                                                                                Ij              E 0^ :j11 E E 1 1 1 I I I i I E 1 I 1) I ie¢ 1 E H ahi •            25 2015 105 0 Ex (MeV)         Fig. 2. Spectrum of deuterons from the 2H(3He, d)SHe* reaction at 6°. Dashed                curve shows the density of phase space which was arbitrarily normalized. 4.0 — 11I I I I —                                         (3(3He,d)3He* 3.5— E3He= 81.4 MeV            4) 3.0—010b = IOC3HeCg'nd) —    E2.5 —! — D(3He.p)4He                02.0—             11r1.5—{{{{{I{{${{{{D{II{{l{{1[I{{$H{{{{~{{`~{p.p,n threshold 1.0 - {threshold—                             •D(3He,a)H   0.5—~               •,,~tpx/i0 ow Int VIER~ 0 I E E E I E E E 1 1 E E E 1 1 1 1 1 1/ 1 1 1 1 1 •          252015 10 5 0 Ex ( MeV)                 Fig. 3. The same as in Fig. 2 except for the different angle. diminishes at 10°. Phase space factors which were arbitrarily normalized to data can explain the shape of spectra near thresholds, but can not reproduce the continua over the whole energy range. It would be valuable to pursue studies to investigate properties of the strongly populated continua. It is necessary to make a kinematically complete experiment to detect two or three particles.    The authors would like to thank the members of the INS cyclotron crew for their helpful co-operations. They are also indebted to Mr. I. Sugai for the preparation of targets. ( 286 )                Continuous Deuteron Spectra from  8He+2H at 81 MeV                        REFERENCES (1) C. C. Chang, E. M. Diener, and E. Ventura Proc. Conference on Few Particle Problem in the     Nuclear Interaction (Los Angels, 1972) p. 527. (2) J. Arvieux, A. Fiore, J. Jungerman, and Nguyen Van Sen Proc. Conference on Few Particle     Problem in the Nuclear Interaction (Los Angels, 1972) p. 519. (3) K. Yagi, H. Ogawa, Y. Ishizaki, T. Ishimatsu, J. Kokame, and K. Matsuda, Nucl. Instrum.     Method, 52, 29 (1967). ( 287 )

Continuous Energy Spectra of Deuterons in the ³He+²H Reaction Induced by 81.4 MeV ³He (Memorial Issue Dedicated to the Late Professor Yoshiaki Uemura)

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Continuous Energy Spectra of Deuterons in the ³He+²H Reaction Induced by 81.4 MeV ³He (Memorial Issue Dedicated to the Late Professor Yoshiaki Uemura)

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