An unexpected 12− state in 55Mn

doi:10.1016/0370-2693(71)90018-9

Physics Letters B

Volume 37, Issue 3, 29 November 1971, Pages 278-281

https://doi.org/10.1016/0370-2693(71)90018-9 Get rights and content

Abstract

The angular distribution observed for the ⁵⁷Fe(p, τ) reaction to a level near 1.29 MeV in ⁵⁵Mn shows a striking rise at small angles. This signature of an L = 0 transferred pair requires the existence of a new state nearly degenerate with the $112^{−}$ state known at 1.292 MeV. Comparison of the (p, τ) and d, α) angular distributions implies a spin of $12^{−}$ for this state. Shell model calculations including both 2p-3h and 3p-4h states correctly predict this level and its properties.

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A study of the 51V(6Li, d)55Mn reaction
1979, Nuclear Physics, Section A
55Mn(n, n'γ) cross-section studies for E<inf>n</inf> = 1.0-3.6 MeV
1977, Nuclear Physics, Section A
Absolute ⁵⁵Mn(n, n′γ) γ-ray production cross sections have been measured for 19 transitions from levels up to and including the 2429 keV state in ⁵⁵Mn over the energy range E_n = 1.0–3.6 MeV. Angular distributions were also measured for 6 of the transitions. Branching ratios were extracted and total inelastic neutron cross sections were inferred for these ⁵⁵Mn excited states. The measured and inferred cross sections are compared with calculated cross sections using the statistical compound nucleus theory.
Spins and lifetimes of levels in 55Mn
1973, Nuclear Physics, Section A
The study of excited ⁵⁵Mn levels with the ⁵²Cr(α, pγ) reaction was extended to levels up to 3161 keV. With a Ge(Li) detector, DSA measurements in gold-backed targets were made, as well as angular correlations; both of these experiments were done in coincidence with protons detected near 180°. A multiple-detector NaI(Tl) array was also used in the same reaction geometry for better γ-ray detection efficiency. Mean lifetimes of 12 levels from 2727 to 3161 keV are reported. Spins and sometimes parities of the following levels were deduced from the angular-correlation analyses and lifetime results: 1885 keV, $72$ ⁻; 2199 keV, $72$ (⁻); 2311 keV, ( $132$ ); 2366keV, $52$ ⁻; 2727 keV, $72$ ; 2823 keV, $92$ . Multipole mixing ratios and M1 and E2 transition rates of the radiations from these and from the 1292 keV level are presented. The similarity of the low-lying level structure and of interlevel transitions in ⁵⁵Mn to those in certain other f_$72$³ nuclei is examined.

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^☆: Work supported in part by the U.S. Atomic Energy Commission.

^∗∗: Present address: Physics Department, University of Pittsburgh, Pittsburgh, Pennsylvania, USA

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Physics Letters B

Abstract

References (15)

Nucl. Phys.

Nucl. Phys.

Nuovo Cimento

Nucl. Phys.

Phys. Letters

Phys. Rev.

Nucl. Phys.

Phys. Rev.

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An unexpected 12− state in 55Mn☆

Abstract

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An unexpected $12^{−}$ state in ⁵⁵Mn☆