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Chinese Physics C> 2005, Vol. 29> Issue(2) : 139-146 

New Low-spin Levels in 76Se and Discussion of Its Yrast Band Structure

  •  Shanghai Institute of Applied Physics,the Chinese Academy of Sciences,Shanghai 201800,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100049,China

  • The decay of bromine–76 was studied using compton–suppressed spectrometer and high–purity ge detectors in singles and coincidence mode, respectively. bromine–76 was produced via two reactions,i. e.,75As(α,3n)76Br and 76Se(p, n)76Br.the results of these experiments verified the previously reported levels and gammas of 76Se. in addition to the previously described transitions and levels, 39 new γ–rays and 15 new energy levels were found for the first time. spins and parities for new levels are proposed based on the calculated logft values, de–excitation modes of the observed states, and some nuclear reaction experiment results. a new decay scheme of 76Br is proposed in the present work. combining with the high–spin states observed by the in–beam γ–ray spectroscopy of a previous decay work, the positive–parity yrast states were compared with the results from calculations in the framework of the projected shell model.
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    [1] . Lecomt e R, Paradis P, Barrette J et al . Nucl . Phys. , 1977, A284: 1232. Allan Bromley D. Treat ise on Heavy-Ion Physics. Vol. 8. New York,London: Plenum Press, 19893. Hamilton J H et al. Phys. Rev. Lett. , 1974, 32: 2394. Hamilton J H et al. Phys. Rev. Lett. , 1976, 36: 3405. Singh B, Viggars D A. Nucl. Data Sheet s, 1984, 42: 2336. Singh B. Nucl . Data Sheets, 1995, 74: 637. Ladenbauer-Bellis I M et al . Can. J. Phys. , 1971, 49: 548. Vylov Ts, Dzhelepov B S, Dmit riev A G et al . Proc. 25th Ann. Conf .Nucl. Spectrosc. Struct . At. Nucl ei. Leningrad: 1975. 669. Nagahara T et al. J. Phys. Soc. Jap. , 1974, 37: 110. Dzhelepov B S et al. Izv. Akad. Nauk SSSR, Ser. Fiz. 1969, 33: 14;Bull. Acad. Sci. USSR, Phys. Ser. 1970, 33: 1411. LI Yan et al. Nuclear Science and Techniques, 1998, 9: 19912. Dzhelepov B S, Dmitriev A G, Zhukovskii N N. Izv. Akad. NaukSSSR, Ser. Fiz. 1971, 35: 2249; Bull. Acad. Sci. USSR, Phys.Ser. 1972, 35: 204313. Audi G, Wapstra A H. Nucl. Phys. , 1993, A565: 114. Aage Bohr, Ben R. Mottelson. Nuclear Structure. New York, Amsterdam: Benjamin, 1969. 16915. Mller P et al . Atom. Data and Nucl. Data Tables, 1995, 59: 18516. ZHANG Jing-Ye et al. Phys. Rev. , 1989, C39: 71417. Bengtsson T, Ragnarsson I. Nucl. Phys. , 1985, A436: 1418. SUN Yang et al. Phys. Rev. , 2000, C62: 02160119. Subber A R H et al . J. Phys. , 1987, G13: 80720. Matoba M, Hyakutake M, Koori N et al. Nucl. Phys. , 1979, A325: 38921. Matoba M. Phys. Lett . , 1979, B88: 24922. Wells J C Jr et al. Phys. Rev. , 1980, C22: 112623. SUN Yang, WU Cheng-Li. Phys . Rev. , 2003, C68: 024315

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SHEN Shui-Fa, LI Yan and GU Jia-Hui. New Low-spin Levels in 76Se and Discussion of Its Yrast Band Structure[J]. Chinese Physics C, 2005, 29(2): 139-146.
SHEN Shui-Fa, LI Yan and GU Jia-Hui. New Low-spin Levels in 76Se and Discussion of Its Yrast Band Structure[J]. Chinese Physics C, 2005, 29(2): 139-146. shu
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Received: 2004-05-18
Revised: 1900-01-01
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New Low-spin Levels in 76Se and Discussion of Its Yrast Band Structure

    Corresponding author: SHEN Shui-Fa,
  • Shanghai Institute of Applied Physics,the Chinese Academy of Sciences,Shanghai 201800,China2 Graduate School of the Chinese Academy of Sciences,Beijing 100049,China
  • Received Date: 2004-05-18
  • Accepted Date: 1900-01-01
  • Available Online: 2005-02-05

Abstract: The decay of bromine–76 was studied using compton–suppressed spectrometer and high–purity ge detectors in singles and coincidence mode, respectively. bromine–76 was produced via two reactions,i. e.,75As(α,3n)76Br and 76Se(p, n)76Br.the results of these experiments verified the previously reported levels and gammas of 76Se. in addition to the previously described transitions and levels, 39 new γ–rays and 15 new energy levels were found for the first time. spins and parities for new levels are proposed based on the calculated logft values, de–excitation modes of the observed states, and some nuclear reaction experiment results. a new decay scheme of 76Br is proposed in the present work. combining with the high–spin states observed by the in–beam γ–ray spectroscopy of a previous decay work, the positive–parity yrast states were compared with the results from calculations in the framework of the projected shell model.

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