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Yol 2 7 Ns 1 0 Barc/1995/P/005 O O 5 Government of India 6 Atomic Energy Commission TRN-IN9600313 S BARC/i995)!>/005 CO I> NUCLEAR PHYSICS DIVISION BIENNIAL REPORT 1993-1994 Edited by K. Kumar and S. K. Kataria 1995 YOL 2 7 NS 1 0 BARC/1995/P/005 O O 5 GOVERNMENT OF INDIA 6 ATOMIC ENERGY COMMISSION U 0! NUCLEAR PHYSICS DIVISION BIENNIAL REPORT 1993-1994 Edited by: K. Kumar and S.K. Kataria Nuclear Physics Division BHABHA ATOMIC RESEARCH CENTRE BOMBAY, INDIA 1995 BARC/1993/P/003 BIBLIOGRAPHIC DESCRIPTION SHEET FOR TECHNICAL REPORT (as p»r IS t 9400 - 1980) 01 Security classification t Unclassified 02 Distribution : External 03 Report status t New 04 Series 3 BARC External 03 Report type : Progress Report 06 Report No. : BARC/1995/P/005 07 Part No. or Volume No. t 08 Contract No. s 10 Title and subtitle i Nuclear Physics Division biennial report 1993-1994 11 Collation t 93 p., figs., tabs. 13 Project No. : 2O Personal author (s) i K. Kumar; S.K. Kataria (eds.) 21 Affiliation of author (s) i Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay 22 Corporate author(s) i Bhabha Atomic Research Centre, Bombay-400 083 23 Originating unit s Nuclear Physics Division, BARC, Bombay 24 Sponsor(s) Name i Department of Atomic Energy Type i Government 30 Date of submission s August 1993 31 Publication/Issue date September 1995 ccntd...(ii> (ii) 40 Publisher/Distributor i Head, Library and Information Division, Bhabha Atomic Research Centre, Bombay 42 Form of distribution i Hard Copy 90 Language of text i English 91 Language of summary i English 92 No. of references i refs. 93 Gives data on i 6O Abstract i The activities of the Nuclear Physics Division of Bhabha. Atomic Research Centre for the two year period January 1993 to December 1994 are summarised. The experimental Nuclear Physics research activities are centred around the 14 UD Pelletron accelerator. Instrumentation development for the reserach utilization of the accelerator as well as accelerator development activities connected with the superconducting LINAC booster are included. During the period the conversion of the 9.9 MV single stage Van de Sraaff Accelerator into a 7 11V folded tandem accelerator for light and heavy ions, for use not only in low energy nuclear physics but also in various inter-disciplinary areas was carried out. The research activity in the field of study of heavy ion reactions involving elastic scattering, transfer reactions, fusion-fission phenomena, heavy ion resonances, high energy photons in nuclear reactions and level density determination from charged particle spectra emitted in heavy ion reactions are given. 70 Keywords/Descriptors t NUCLEAR PHYSICS; BARC; PROGRESS REPORT; RESEARCH PROGRAMS; PELLETRON ACCELERATORS; LIWEAR ACCELERATORS; PARTICLE BOOSTERS; ELASTIC SCATTERING; ANGULAR DISTRIBUTION» HEAVY ION REACTIONS; RADIATION DETECTORS; CROSS SECTIONS; TANDEM ELECTROSTATIC ACCELERATORS; NUCLEAR REACTIONS; DATA ACQUISITION SYSTEMS; X-RAY FLUORESCENCE ANALYSIS 71 Class No. i INIS Subject Category i G3OOO 99 Supplementary elements i FOREWORD The activities of the Nuclear Physics Division of Bhabha Atomic Research Centre for the two year period January 1993 to December 1994 are summarised in this report. The experimental Nuclear Physics research activities are centred around the 14 UD Pelletron accelerator which is a joint facility of Bhabha Atomic Research Centre(BARC) and Tata Institute of Fundamental Research (TIFR). The staff of the Division play a major role in the operation and main- tenance of this accelerator located at TIFR/ Colaba. In- strumentation development for the research utilization of the accelerator as well as acccelerator development ac- tivities connected with the superconducting LINAC booster are included in the report. A significant development during the period of this report is the taking up of Folded Tandem Ion Accelerator (FOTIA) project at Trombay for the conversion of the 5.5 MV single stage Van de Graaff Accelerator into a 7 MV folded tandem accelerator for light and heavy ions, for use not only in low energy nuclear physics but also in various inter-disciplinary areas. The research output in the field of study of heavy ion reactions involving elastic scattering, transfer reactions, fusion-fission phenomena, heavy ion resonances, high energy photons in nuclear reactions and level density determination from charged particle spectra emitted in heavy ion reactions are reflected in the large number of publications in na- tional and international journals. Theoretical Nuclear Physics activities in the intermediate energies which form a significant part of the research activities are also in- cluded. List of publications as well as their abstracts are included at the end of the report. Trombay, Bombay. August 2, 1995 M.A. Eswaran Head, Nuclear Physics Division CONTENTS Research Activities 1.Experiments 1 2.Theory 33 3.Applications and Instrumentation 54 Publications l.List of Publications 65 2.Abstracts of Published Papers 75 3.Abstracts of Papers under Publication 84 4.Staff List 8.9 INVESTIGATION OF THE ALPHA-LINEAR CHAIN CONFIGURATION IN MMg AT 48.4 MeV EXCITATION THROUGH ALPHA AND «Be-CHANNELS M. A. Eswaran, E. T. Mlrgule, Suresh Kumar, D. R. Chakraberty, V. M. Datar, N. L. Ragoowansi, H. H. Osa, and U. K. Pal Extremely deformed states corresponding to the 46.4 MeV to MMg. alpha linear chain configuration (LCC) are predicted These observations show that the resonance at 46.4 by the cluster model[l], Hartree-Fock[2] and Nilsson- MeV excitation to MMg decays to the 13.9 and 20.5 Strutinsky calculations[3] in light N=Z, 4 «-nuclei. The MeV states which belong to the prolate band built 7.65 MeV, Of state of UC known to be 3ct-LCC. In "0 on 6.72 MeV,0+ state to »Ne. It also decays to the a rotational band built on the 4a-LCC has been iden- 4O-LCC at 18 MeV to UO. The larger cross sections In tified with the 2+, 4+, and 6+ members at excitation these three channels compared to 15 pb/sr observed in energies of 17.15, 18.05, and 19.35 MeV, respective- taC£cc+uC£CC by Wuosmaa et.al., may primarily be ly^]. The possible alpha linear chain configuration due to the larger penetrabilities of the lower /-values in a4Mg is observed recently by Wuosmaa et.al.[5], as involved. a resonance in the reaction Mc(BC,uOcc!C)iaOca? at In summary, the present work provides further ev- U E( C) = 65 MeV, where «c«:c corresponds to the idence of the existence of the 6a-LCC at 46.4 MeV by LCC state of "C at 7.65 MeV. its selective decays through a and *Be channels to pro- In order to investigate the possible decay modes of late states in "Ne and 4o>LCC in 16O, respectively. the 6a-LCC further, we measured the excitation func- u 12 w u 8 tion for the reactions C( C,a) Ne* and C(»C, Be) References 18O* for beam energy range of 50 to 70 MeV in steps of 1 MeV, using the MUD pelletron of BARC-TIFR at Bombay. Two surface barrier A&-E detector tele- 1. S. Marsh et.al., Phys.Let. B180 (1986) 185; Mer- scopes similar to that described in reference[6] were chant ecal. NuchPhys. A549 (1992) 431 setup at 8° and 12° to the beam for detecting a and 8 2. H.Flocard et.al., Prog.Theor.Phys. 72(1984)1000, Be, respectively. The spectra obtained at E("C) =* 65 MeV for 8Be and « particles are shown in Fig.l as an Nucl.Phys. A391 (1982) 285 8 example. The Be channel leading to states above 18 3. G. Leander et.al., Nucl.Phys. A239 (1975) 93 MeV excitation in 16O could not be observed unam- biguosly due to possible presence of 7Li in the region. 4. P. Chevallier et.al., Phys.Rev. 160 (1967) 827 The target was 45/tgm/cm2 thick self- supported foil of natural carbon. 5. A. H. Wuosmaa et.al., Phys.Rev.Lett. 68 (1992) The analysis reported here focuses attention on the 1295 34 region of excitation in Mg where the 6a-LCC is ex- 6. M. A. Eswaran et.al., Phys.Rev. C47 (1993) pected. In this region three exit channels are seen to 1418 resonate viz. two a-channels leading to 13.9 MeV,6+ and 20.5 MeV,8+ states of MNe and 8Be-channel lead- ing to 18 MeV (the 2+,4+ members of 4«-LCC state unresolved) excitation in 18O. A broad structure at E(UC) = 65 MeV with a width (in cm.) of 3 to 4 MeV is observed in all the three channels as shown in Fig.2(b)-(d). The position and width of the structure agree with the 6a-LCC structure observed by Wuos- mma et.al.( shown in Fig.2(a)). As the 8Be spectrum obtained by AE-E detector telescope had a large background in the region corre- sponding to 18 MeV excitation in I6O, at which the possible contribution from 7Li yield could not be ruled out. We repeated the excitation function measurement using a twin detector for identification of 8Be by de- tecting the two breakup alphas in coincidence. In this spectrum also, we observed the 18 MeV peak and the excitation function of it reproduced the structure at 300 («0 '310 1(0 SO 1(0 }«0 370 «00 «80 BW MO 710 NO CMMMHl NVMKN 70 140 210 260 350 «10 «W KO MO 700 jCHANNEl, NUMBER -1 1 I. 10 JO «0 SO M MIPHA «HTICIE OWN CONfBURWION IN 'S* AT <6.i MtV EXCITATION 20 - a v/'jS. Wuosmoo «tat 10 i 0 b "£1000 «A / 1 \ •a SOO > '! \ i i i E ° c •o^OOO b 2.2000 n ! V , 1 400 .
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